I think your scan tool is not communicating properly. To my knowledge, once you manually unlock the epb it has to have a recalibration process with a factory tool.My car GranTurismo Sport 2014
What would the next steps be?
EPB was working just fine and after running a OBD scan and running EPB recalibration it locked and manual release. The failure light remains lit as well the green Gear select disappearing.
Here is what I have done;
1. "EPB Failure only manual unlock allowed: See hand book"- I manually released Park Brake
2. Using Foxwell NT510 elite tried special function to recalibrate - Negative result and Locks EPB on again
3. Using scanner select brake off - commands brake off Voltage was reading 12.1V
4. Now amber Park OFF and Red brake warning On with "EPB failure see dealer" message
5. Tried disconnecting Neg battery terminal for 10s but warning remains. Reluctant to leave disconnected for longer as I would then have to get Radio code?
6. Error code C155A "EPB system calibration error-Invalid signal" and U1701 "No communication with NCM - Invalid signal"
7. Other peculiarity is that the centre display now only displays RPM with Green gear selection PRD etc totally blank!
I can only assume that the EPB ECU has not been calibrated OR that the Scanner is not speaking proper Italian to it. Also possible, that it is speaking proper Italian but the ECU has gone for a coffee break!
Any advice on this as to what is the correct procedure in order to get rid of the warning light and resumption of normal EPB function?
View attachment 141484
EPB how do I recalibrate and get rid of brake warning light?
My car GranTurismo Sport 2014
What would the next steps be?
EPB was working just fine and after running a OBD scan and running EPB recalibration it locked and manual release. The failure light remains lit as well the green Gear select disappearing.
Here is what I have done;
1. "EPB Failure only manual unlock allowed: See hand book"- I manually released Park Brake
2. Using Foxwell NT510 elite tried special function to recalibrate - Negative result and Locks EPB on again
3. Using scanner select brake off - commands brake off Voltage was reading 12.1V
4. Now amber Park OFF and Red brake warning On with "EPB failure see dealer" message
5. Tried disconnecting Neg battery terminal for 10s but warning remains. Reluctant to leave disconnected for longer as I would then have to get Radio code?
6. Error code C155A "EPB system calibration error-Invalid signal" and U1701 "No communication with NCM - Invalid signal"
7. Other peculiarity is that the centre display now only displays RPM with Green gear selection PRD etc totally blank!
I can only assume that the EPB ECU has not been calibrated OR that the Scanner is not speaking proper Italian to it. Also possible, that it is speaking proper Italian but the ECU has gone for a coffee break!
Any advice on this as to what is the correct procedure in order to get rid of the warning light and resumption of normal EPB function?
![Automotive tail & brake light Automotive lighting Automotive design Automotive mirror Automotive exterior]()
What would the next steps be?
EPB was working just fine and after running a OBD scan and running EPB recalibration it locked and manual release. The failure light remains lit as well the green Gear select disappearing.
Here is what I have done;
1. "EPB Failure only manual unlock allowed: See hand book"- I manually released Park Brake
2. Using Foxwell NT510 elite tried special function to recalibrate - Negative result and Locks EPB on again
3. Using scanner select brake off - commands brake off Voltage was reading 12.1V
4. Now amber Park OFF and Red brake warning On with "EPB failure see dealer" message
5. Tried disconnecting Neg battery terminal for 10s but warning remains. Reluctant to leave disconnected for longer as I would then have to get Radio code?
6. Error code C155A "EPB system calibration error-Invalid signal" and U1701 "No communication with NCM - Invalid signal"
7. Other peculiarity is that the centre display now only displays RPM with Green gear selection PRD etc totally blank!
I can only assume that the EPB ECU has not been calibrated OR that the Scanner is not speaking proper Italian to it. Also possible, that it is speaking proper Italian but the ECU has gone for a coffee break!
Any advice on this as to what is the correct procedure in order to get rid of the warning light and resumption of normal EPB function?
1 - 20 of 35 Posts
I think your scan tool is not communicating properly. To my knowledge, once you manually unlock the epb it has to have a recalibration process with a factory tool.
You need to figure out about the U1701...Your engine ECM is not communicating with your EPB module...Jason
Could that be because the EPB module is "locked out"? If so how can it be brought back online?You need to figure out about the U1701...Your engine ECM is not communicating with your EPB module...Jason
Does this explain the absence of green Gear selected being displayed?
It's not locked out..Just not communicating...The gear indicator is probably missing due to the network issue..Jason
My car GranTurismo Sport 2014
What would the next steps be?
EPB was working just fine and after running a OBD scan and running EPB recalibration it locked and manual release. The failure light remains lit as well the green Gear select disappearing.
Here is what I have done;
1. "EPB Failure only manual unlock allowed: See hand book"- I manually released Park Brake
2. Using Foxwell NT510 elite tried special function to recalibrate - Negative result and Locks EPB on again
3. Using scanner select brake off - commands brake off Voltage was reading 12.1V
4. Now amber Park OFF and Red brake warning On with "EPB failure see dealer" message
5. Tried disconnecting Neg battery terminal for 10s but warning remains. Reluctant to leave disconnected for longer as I would then have to get Radio code?
6. Error code C155A "EPB system calibration error-Invalid signal" and U1701 "No communication with NCM - Invalid signal"
7. Other peculiarity is that the centre display now only displays RPM with Green gear selection PRD etc totally blank!
I can only assume that the EPB ECU has not been calibrated OR that the Scanner is not speaking proper Italian to it. Also possible, that it is speaking proper Italian but the ECU has gone for a coffee break!
Any advice on this as to what is the correct procedure in order to get rid of the warning light and resumption of normal EPB function?
View attachment 141484
I did the exact same thing as you with my new Foxwell NT530. My EPB was working fine, but while learning to use the scanner, I just could not resist recalibrattingMy car GranTurismo Sport 2014
What would the next steps be?
EPB was working just fine and after running a OBD scan and running EPB recalibration it locked and manual release. The failure light remains lit as well the green Gear select disappearing.
Here is what I have done;
1. "EPB Failure only manual unlock allowed: See hand book"- I manually released Park Brake
2. Using Foxwell NT510 elite tried special function to recalibrate - Negative result and Locks EPB on again
3. Using scanner select brake off - commands brake off Voltage was reading 12.1V
4. Now amber Park OFF and Red brake warning On with "EPB failure see dealer" message
5. Tried disconnecting Neg battery terminal for 10s but warning remains. Reluctant to leave disconnected for longer as I would then have to get Radio code?
6. Error code C155A "EPB system calibration error-Invalid signal" and U1701 "No communication with NCM - Invalid signal"
7. Other peculiarity is that the centre display now only displays RPM with Green gear selection PRD etc totally blank!
I can only assume that the EPB ECU has not been calibrated OR that the Scanner is not speaking proper Italian to it. Also possible, that it is speaking proper Italian but the ECU has gone for a coffee break!
Any advice on this as to what is the correct procedure in order to get rid of the warning light and resumption of normal EPB function?
View attachment 141484
My car GranTurismo Sport 2014
What would the next steps be?
EPB was working just fine and after running a OBD scan and running EPB recalibration it locked and manual release. The failure light remains lit as well the green Gear select disappearing.
Here is what I have done;
1. "EPB Failure only manual unlock allowed: See hand book"- I manually released Park Brake
2. Using Foxwell NT510 elite tried special function to recalibrate - Negative result and Locks EPB on again
3. Using scanner select brake off - commands brake off Voltage was reading 12.1V
4. Now amber Park OFF and Red brake warning On with "EPB failure see dealer" message
5. Tried disconnecting Neg battery terminal for 10s but warning remains. Reluctant to leave disconnected for longer as I would then have to get Radio code?
6. Error code C155A "EPB system calibration error-Invalid signal" and U1701 "No communication with NCM - Invalid signal"
7. Other peculiarity is that the centre display now only displays RPM with Green gear selection PRD etc totally blank!
I can only assume that the EPB ECU has not been calibrated OR that the Scanner is not speaking proper Italian to it. Also possible, that it is speaking proper Italian but the ECU has gone for a coffee break!
Any advice on this as to what is the correct procedure in order to get rid of the warning light and resumption of normal EPB function?
View attachment 141484
My car GranTurismo Sport 2014
What would the next steps be?
EPB was working just fine and after running a OBD scan and running EPB recalibration it locked and manual release. The failure light remains lit as well the green Gear select disappearing.
Here is what I have done;
1. "EPB Failure only manual unlock allowed: See hand book"- I manually released Park Brake
2. Using Foxwell NT510 elite tried special function to recalibrate - Negative result and Locks EPB on again
3. Using scanner select brake off - commands brake off Voltage was reading 12.1V
4. Now amber Park OFF and Red brake warning On with "EPB failure see dealer" message
5. Tried disconnecting Neg battery terminal for 10s but warning remains. Reluctant to leave disconnected for longer as I would then have to get Radio code?
6. Error code C155A "EPB system calibration error-Invalid signal" and U1701 "No communication with NCM - Invalid signal"
7. Other peculiarity is that the centre display now only displays RPM with Green gear selection PRD etc totally blank!
I can only assume that the EPB ECU has not been calibrated OR that the Scanner is not speaking proper Italian to it. Also possible, that it is speaking proper Italian but the ECU has gone for a coffee break!
Any advice on this as to what is the correct procedure in order to get rid of the warning light and resumption of normal EPB function?
View attachment 141484
I did the exact same thing as you with my Foxwell NT530. My EPB was working fine with an occasional error requiring me to disconnect the battery to clear the error message on the dash. While learning to use the scanner I could not resist recalibrating and adjusting the EPB, needless to say I also ended up with a red brake light and see dealer light on the dash which cannot be cleared with the scanner or battery reboot after 12 hours. Were you able to resolve the issue? And if so, how? At least I waited until after I got my inspection for license plates before I screwed it up, so I have a year to figure it out. My EPB simply does not come on when I shut the car off.My car GranTurismo Sport 2014
What would the next steps be?
EPB was working just fine and after running a OBD scan and running EPB recalibration it locked and manual release. The failure light remains lit as well the green Gear select disappearing.
Here is what I have done;
1. "EPB Failure only manual unlock allowed: See hand book"- I manually released Park Brake
2. Using Foxwell NT510 elite tried special function to recalibrate - Negative result and Locks EPB on again
3. Using scanner select brake off - commands brake off Voltage was reading 12.1V
4. Now amber Park OFF and Red brake warning On with "EPB failure see dealer" message
5. Tried disconnecting Neg battery terminal for 10s but warning remains. Reluctant to leave disconnected for longer as I would then have to get Radio code?
6. Error code C155A "EPB system calibration error-Invalid signal" and U1701 "No communication with NCM - Invalid signal"
7. Other peculiarity is that the centre display now only displays RPM with Green gear selection PRD etc totally blank!
I can only assume that the EPB ECU has not been calibrated OR that the Scanner is not speaking proper Italian to it. Also possible, that it is speaking proper Italian but the ECU has gone for a coffee break!
Any advice on this as to what is the correct procedure in order to get rid of the warning light and resumption of normal EPB function?
View attachment 141484
I am a little bit further on down the line. I have replaced the rear brake shoes and then tried to reset the calibration which has so far yielded a negative result. On checking the cable junction under the battery box with EPB selected on the Right secondary cable is slack. I suspect that either the cable is broken or that somehow it has become detached. Ordered a cable and will shortly dismantle the EPB cable junction under the battery to see what exactly is the problem. You could try what "eatonsr" (EPB Failure "Go To Dealer" and "Brake Light" 2009 GT) has tried in that he switched engine on during calibration which then yielded a positive result and removed the Check light. Once I clear my fault I will then look at getting my gear selector green light back in the centre display and post here. I hope it works out for you.I did the exact same thing as you with my new Foxwell NT530. My EPB was working fine, but while learning to use the scanner, I just could not resist recalibratting
I did the exact same thing as you with my Foxwell NT530. My EPB was working fine with an occasional error requiring me to disconnect the battery to clear the error message on the dash. While learning to use the scanner I could not resist recalibrating and adjusting the EPB, needless to say I also ended up with a red brake light and see dealer light on the dash which cannot be cleared with the scanner or battery reboot after 12 hours. Were you able to resolve the issue? And if so, how? At least I waited until after I got my inspection for license plates before I screwed it up, so I have a year to figure it out. My EPB simply does not come on when I shut the car off.
Yea, EPB shoes were going to be my next action, I replaced the rear pads hoping to turn off the red brake light, to no avail, but I did discover there is another separate red break wear indicator light 🤪. Wow, you have done a lot of work to solve this issue, I wish you the best of luck, I will try the engine start while calibrating, but that would be too easy.I am a little bit further on down the line. I have replaced the rear brake shoes and then tried to reset the calibration which has so far yielded a negative result. On checking the cable junction under the battery box with EPB selected on the Right secondary cable is slack. I suspect that either the cable is broken or that somehow it has become detached. Ordered a cable and will shortly dismantle the EPB cable junction under the battery to see what exactly is the problem. You could try what "eatonsr" (EPB Failure "Go To Dealer" and "Brake Light" 2009 GT) has tried in that he switched engine on during calibration which then yielded a positive result and removed the Check light. Once I clear my fault I will then look at getting my gear selector green light back in the centre display and post here. I hope it works out for you.
Another simple thing to check since you are mentioning you replacing the rear brakes specifically, is theres a chassis ground connected to the rear drivers side brake wear sensor around the lower control arm. If thats loose or didnt get reconnected with the new brake wear sensor then youll also get a bunch of those EPB failures lights/go to dealer error .
Many thanks for this and will be re-checking this again. It is advice like this on the forum that is helpful in trying to rectify issues that we experience with our cars. We don't have the luxury of trying modules off the self or simply replacing parts from beginning to end in order to logically find out what the actual problem is.
I did the exact same thing as you. Did you end up solving the issue? If yes, what did you do? I have to renew my registration and it won't pass like this.Many thanks for this and will be re-checking this again. It is advice like this on the forum that is helpful in trying to rectify issues that we experience with our cars. We don't have the luxury of trying modules off the self or simply replacing parts from beginning to end in order to logically find out what the actual problem is.
@hkbazzi I have not got around to doing yet. I have to do this in the next few weeks. As soon as I have rectified problem i will post. As for the absent gear selector being displayed and this being a network issue I am hoping with recalibration it will come back. I am at a loss as to why is dropped out simply after trying to recalibrate the EPB.
Hey did you ever get this fixed? My dumb butt did the exact same thing for an intermittent parking brake failure, now I can’t get the red brake light and go to dealer lights to go away. Did you ever get this resolved? @[email protected] Enzo`s Atlanta do you get any familiarity with this goof up? I’m debating just driving it to the Atlanta workshop if this is something that needs specialized equipment to recalibrateI did the exact same thing as you with my new Foxwell NT530. My EPB was working fine, but while learning to use the scanner, I just could not resist recalibratting
I did the exact same thing as you with my Fox well NT530. My EPB was working fine with an occasional error requiring me to disconnect the battery to clear the error message on the dash. While learning to use the scanner I could not resist recalibrating and adjusting the EPB, needless to say I also ended up with a red brake light and see dealer light on the dash which cannot be cleared with the scanner or battery reboot after 12 hours. Were you able to resolve the issue? And if so, how? At least I waited until after I got my inspection for license plates before I screwed it up, so I have a year to figure it out. My EPB simply does not come on when I shut the car off.I did the exact same thing as you with my new Foxwell NT530. My EPB was working fine, but while learning to use the scanner, I just could not resist recalibratting
I did the exact same thing as you with my Foxwell NT530. My EPB was working fine with an occasional error requiring me to disconnect the battery to clear the error message on the dash. While learning to use the scanner I could not resist recalibrating and adjusting the EPB, needless to say I also ended up with a red brake light and see dealer light on the dash which cannot be cleared with the scanner or battery reboot after 12 hours. Were you able to resolve the issue? And if so, how? At least I waited until after I got my inspection for license plates before I screwed it up, so I have a year to figure it out. My EPB simply does not come on when I shut the car off.
Yeah, you generally can't get that system to work without the correct software...Jason
Hey did you ever get this fixed? My dumb butt did the exact same thing for an intermittent parking brake failure, now I can’t get the red brake light and go to dealer lights to go away. Did you ever get this resolved? @[email protected] Enzo`s Atlanta do you get any familiarity with this goof up? I’m debating just driving it to the Atlanta workshop if this is something that needs specialized equipment to recalibrate
[/QUOTE
My EPB shoes turned out to be gone, I replaced them last week and adjusted them out to where I could just barely slip the rotors back on. I then attempted to calibrate them with the Foxwell on about 5 occasions, I could hear adjustments being made and just as it would get to step 5 or 6 it would error out every time. I then used the option to adjust the cables, when that was completed the EPB was locked on and the car wouldn’t move, so I had to get in the trunk with the specialty tool and unlock the brakes. I need a safety inspection to renew plates next month, so I guess I’ll have to take it to a local shop. I just hate giving up on fixing it myself. Oh yea, I sent Foxwell a message about recalibration but as expected I have not heard back from them.Hey did you ever get this fixed? My dumb butt did the exact same thing for an intermittent parking brake failure, now I can’t get the red brake light and go to dealer lights to go away. Did you ever get this resolved? @[email protected] Enzo`s Atlanta do you get any familiarity with this goof up? I’m debating just driving it to the Atlanta workshop if this is something that needs specialized equipment to recalibrate
Update,
Garage had an identical Car in and swapped EPB Actuator unit and that worked fine. So it appears that the ECU is faulty, the actuator obeys park brake on and off through the OBD But I suspect that somehow the chipboard inside is malfunctioning. Can anyone suggest a replacement for just the circuit board or actuator from another car make which is less than the $1200 for a Maserati part?
Garage had an identical Car in and swapped EPB Actuator unit and that worked fine. So it appears that the ECU is faulty, the actuator obeys park brake on and off through the OBD But I suspect that somehow the chipboard inside is malfunctioning. Can anyone suggest a replacement for just the circuit board or actuator from another car make which is less than the $1200 for a Maserati part?
I'm not aware on one..I think you are stuck..
Just out of curiosity, did you ever replace the brake cable you had mentioned in your earlier post? My understanding is that the shorter passenger side cable is attached to the EPB actuator and must be purchased together. I took my GT to a independent European repair shop where they attempted to calibrate the EPB with a professional scanner that looked like a laptop, but he had the same results as we have with our Foxwells. He checked my shoe installation and made various brake adjustments and came to the conclusion that the cables must be stretched due to age and tolerances cannot be met with these cables. He came up with about $2500 in parts, I don’t know if that included labor or not. I paid him $300 for his labor and he also gave me a name of a inspection station to take it to. So at least I found out that our Foxwell software is not corrupt and I just got my plates renewed 😎 maybe I’ll have to be concerned about a inspection next year, maybe notUpdate,
Garage had an identical Car in and swapped EPB Actuator unit and that worked fine. So it appears that the ECU is faulty, the actuator obeys park brake on and off through the OBD But I suspect that somehow the chipboard inside is malfunctioning. Can anyone suggest a replacement for just the circuit board or actuator from another car make which is less than the $1200 for a Maserati part?
The right hand Cable was replaced with the protective cable sheath having become horribly distorted. I think as Jason has said there is no alternative but to get the EPB ECU actuator unit replaced As for the length of the cables I cannot coment but they are listed as two different parts..Just out of curiosity, did you ever replace the brake cable you had mentioned in your earlier post? My understanding is that the shorter passenger side cable is attached to the EPB actuator and must be purchased together. I took my GT to a independent European repair shop where they attempted to calibrate the EPB with a professional scanner that looked like a laptop, but he had the same results as we have with our Foxwells. He checked my shoe installation and made various brake adjustments and came to the conclusion that the cables must be stretched due to age and tolerances cannot be met with these cables. He came up with about $2500 in parts, I don’t know if that included labor or not. I paid him $300 for his labor and he also gave me a name of a inspection station to take it to. So at least I found out that our Foxwell software is not corrupt and I just got my plates renewed 😎 maybe I’ll have to be concerned about a inspection next year, maybe not
Update
All operations are now back to normal. EPB functioning and gear selector displays in the instrument cluster.
i) RHS secondary Cable was replaced as there was considerable fraying of the cable shield as in the picture in my post above.
ii) Both brake shoes replaced I used .
iii) EPB module was mechanically fine but something wrong within the Circuit board. This was diagnosed by using a donor functioning EPB unit into my car and that worked fine. So replacement EPB module from Eurospares sorted that issue out. Calibration worked fine with Foxwell NT510 Elite special functions under EPB ECU section.
iv) Once that was all in place the gear display in centre instrument cluster did not return or clear. This required "Proxy file reload" using factory MDVCI (Maserati Diagnostic Vehicle Communication Interface). No not mine but my friendly independent mechanic.
All operations are now back to normal. EPB functioning and gear selector displays in the instrument cluster.
i) RHS secondary Cable was replaced as there was considerable fraying of the cable shield as in the picture in my post above.
ii) Both brake shoes replaced I used .
iii) EPB module was mechanically fine but something wrong within the Circuit board. This was diagnosed by using a donor functioning EPB unit into my car and that worked fine. So replacement EPB module from Eurospares sorted that issue out. Calibration worked fine with Foxwell NT510 Elite special functions under EPB ECU section.
iv) Once that was all in place the gear display in centre instrument cluster did not return or clear. This required "Proxy file reload" using factory MDVCI (Maserati Diagnostic Vehicle Communication Interface). No not mine but my friendly independent mechanic.
1 - 20 of 35 Posts
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