Traction system/selective handling
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Traction system/selective handling
I have a 2001 coupe and just recently the "service vehicle soon" follow by the "service traction system" and the "selective handling" would come up. The selective handling light would come on. I took the car to a reputable corvette mechanic and he cleaned all the sensor grounds. Sometimes it comes on and other times it doesn't after the repair. He mentioned it could be the pump which operates the ABS and the selective handling and that would be an expensive repair. Any ideas? I was thinking of taking it to the local Cheverolet Dealer to get their opinion. Any suggestions would be greatly appreciated.
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Do you mean Active Handling?? When you get the service messages you can use the key pad on the side of the IP to display codes on the DIC. Unlike auto parts stores OBD code readers this one will display any code that is active on the car including OBD, ABS, Air Bags, body codes, etc.
It has been a while since I have owned a C5 but I think the sequence that had to be used to initiate the code display was to push and hold the options button while pushing the fuel button 4 times. That would start an automatic sequence that would display all of the codes. There is a way to go through all of them manually but I can't remember the sequence.
The ABS pump can definitely cause a Service Active Handling message along with Service ABS and Service Traction Control. However, if you aren't getting a Service ABS message it is likely the problem isn't in the pump since when the pump doesn't work properly all of those functions are affected. A service vehicle soon message along with the other two you are getting might indicate you have a steering sensor issue. Is the steering wheel offcenter when you are driving on a straight road? That can cause an issue. Did you recently have some work done on the car where the steering shaft was disconnected from the rack? If the steering shaft/wheel was turned one rotation either way while disconnected that could cause your problem as well.
Checking the codes will go a long way toward leading you to the problem area.
Bill
It has been a while since I have owned a C5 but I think the sequence that had to be used to initiate the code display was to push and hold the options button while pushing the fuel button 4 times. That would start an automatic sequence that would display all of the codes. There is a way to go through all of them manually but I can't remember the sequence.
The ABS pump can definitely cause a Service Active Handling message along with Service ABS and Service Traction Control. However, if you aren't getting a Service ABS message it is likely the problem isn't in the pump since when the pump doesn't work properly all of those functions are affected. A service vehicle soon message along with the other two you are getting might indicate you have a steering sensor issue. Is the steering wheel offcenter when you are driving on a straight road? That can cause an issue. Did you recently have some work done on the car where the steering shaft was disconnected from the rack? If the steering shaft/wheel was turned one rotation either way while disconnected that could cause your problem as well.
Checking the codes will go a long way toward leading you to the problem area.
Bill
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Do you mean Active Handling?? When you get the service messages you can use the key pad on the side of the IP to display codes on the DIC. Unlike auto parts stores OBD code readers this one will display any code that is active on the car including OBD, ABS, Air Bags, body codes, etc.
It has been a while since I have owned a C5 but I think the sequence that had to be used to initiate the code display was to push and hold the options button while pushing the fuel button 4 times. That would start an automatic sequence that would display all of the codes. There is a way to go through all of them manually but I can't remember the sequence.
The ABS pump can definitely cause a Service Active Handling message along with Service ABS and Service Traction Control. However, if you aren't getting a Service ABS message it is likely the problem isn't in the pump since when the pump doesn't work properly all of those functions are affected. A service vehicle soon message along with the other two you are getting might indicate you have a steering sensor issue. Is the steering wheel offcenter when you are driving on a straight road? That can cause an issue. Did you recently have some work done on the car where the steering shaft was disconnected from the rack? If the steering shaft/wheel was turned one rotation either way while disconnected that could cause your problem as well.
Checking the codes will go a long way toward leading you to the problem area.
Bill
It has been a while since I have owned a C5 but I think the sequence that had to be used to initiate the code display was to push and hold the options button while pushing the fuel button 4 times. That would start an automatic sequence that would display all of the codes. There is a way to go through all of them manually but I can't remember the sequence.
The ABS pump can definitely cause a Service Active Handling message along with Service ABS and Service Traction Control. However, if you aren't getting a Service ABS message it is likely the problem isn't in the pump since when the pump doesn't work properly all of those functions are affected. A service vehicle soon message along with the other two you are getting might indicate you have a steering sensor issue. Is the steering wheel offcenter when you are driving on a straight road? That can cause an issue. Did you recently have some work done on the car where the steering shaft was disconnected from the rack? If the steering shaft/wheel was turned one rotation either way while disconnected that could cause your problem as well.
Checking the codes will go a long way toward leading you to the problem area.
Bill
Thanks for your fast reply Bill.
Newmo
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I'm sorry I do mean "active handling".The codes; U1000H, U1064H, C1277H, U1040H. The steering is not off centered. The harmonic balance was replaced Feb. of 2015 I believe they drop the steering rack to replace the Harmonic balance. The warnings just started this week.
Thanks for your fast reply Bill.
Newmo
Thanks for your fast reply Bill.
Newmo
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what sensors are the uxxxx codes showing under? Ie 10 - pcm or 28 - tcs or 40 - bcm or ???
The c1277 and the p1571 are the reason for the lights illuminated on the dash and the service traction control and service active handling.
Could be an ebcm issue or a serial data buss issue causing the uxxxx codes.
The c1277 and the p1571 are the reason for the lights illuminated on the dash and the service traction control and service active handling.
Could be an ebcm issue or a serial data buss issue causing the uxxxx codes.
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PCM P1571 - ASR Desired Torque
TCS C1277 - Requested Torque Signal Circuit Malfunction
The PCM and EBCM together control the anti lock brakes. The communication between these two for torque is direct over wiring between the the PCM and EBCM. When these communications encounter problems the PCM sends an error condition via the serial data buss and disables both TC and AH for the duration of the ignition cycle.
Sounds to me like an intermittent electrical connection.
First thing I would do is check the condition of the wiring bundles under the battery tray. The side terminal C5 batteries were well known for leaking acid. The PCM and its wiring bundle are directly under the battery and there have been many threads about damage to the wiring bundle from acid leaks.
Post back what you find under the battery shelf.
Clear the other codes and then drive the car. When you return pull the codes BEFORE you shut off the engine.
To pull codes with the engine running you MUST first clear all messages displayed in the DIC by using the reset button. Then pull codes as normal.
TCS C1277 - Requested Torque Signal Circuit Malfunction
The PCM and EBCM together control the anti lock brakes. The communication between these two for torque is direct over wiring between the the PCM and EBCM. When these communications encounter problems the PCM sends an error condition via the serial data buss and disables both TC and AH for the duration of the ignition cycle.
Sounds to me like an intermittent electrical connection.
First thing I would do is check the condition of the wiring bundles under the battery tray. The side terminal C5 batteries were well known for leaking acid. The PCM and its wiring bundle are directly under the battery and there have been many threads about damage to the wiring bundle from acid leaks.
Post back what you find under the battery shelf.
Clear the other codes and then drive the car. When you return pull the codes BEFORE you shut off the engine.
To pull codes with the engine running you MUST first clear all messages displayed in the DIC by using the reset button. Then pull codes as normal.
Newmo
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Newmo
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For the rear defogger I would check fuse 48 and relay 46 in the passenger foot well fuse box. From there I would check the wiring to the rear defogger.
For the left actuator issue I would start with the info in the following link:
https://www.corvetteforum.com/forums...-for-free.html
If that doesn't pan out for you post back here. The plastic gear in the actuator is known to crack and cause the same symptoms. That requires a bit more effort to repair.
For the left actuator issue I would start with the info in the following link:
https://www.corvetteforum.com/forums...-for-free.html
If that doesn't pan out for you post back here. The plastic gear in the actuator is known to crack and cause the same symptoms. That requires a bit more effort to repair.
I followed the thread for the LA. The smaller fuse did come out. As soon as I started the car the service vehicle, TC, and then the AH codes. The AH light illuminated on the dash. I didn't drive five minutes and the light went off. I cleared all the codes before I shut off the engine. I'll check it out tomorrow and post. Thanks again for all your advice. Newmo
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What were the codes before you cleared them???
Were they the same PCM and TCS codes as you had earlier???
Fuse and relay should pull straight out. I often have to use needle nose pliars to carefully remove fuses. When you get them out check the blades of them to see if there is any indication of corrosion.
Were they the same PCM and TCS codes as you had earlier???
Fuse and relay should pull straight out. I often have to use needle nose pliars to carefully remove fuses. When you get them out check the blades of them to see if there is any indication of corrosion.
Today after starting the ABS & AH flashed on the dash and then I heard a click sound from the passenger fuse box and they went off.
2nd start an hour later.
Both ABS & AH stayed illuminated.
Read the codes.
10 PCM P 1571 H
P 1689 H C
28 TCS C 1277 H
40 BCM B0432 H C
58 SDM U1040 H
BO RFA U 1000 H
U 1064 H
3rd start ABS & AH illuminate again and then the click and both off
4th start (15min. later) both ABS & AH illuminated. ABS shuts off but AH stayed on and DIC displays "service vehicle soon", "traction control system, "service active handling"
Thanks for reading all of this!
Newmo
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The intermittent nature of the ABS and AH lights suggests either poor grounds or the ignition switch.
I would start with the grounds. Here are two links that will help you identify what is grounded at what location:
http://forums.corvetteforum.com/c5-t...locations.html
http://forums.corvetteforum.com/c5-t...tion-long.html Post #1
I would concentrate on grounds G103, G104, G106, G108.
Check and clean any that are suspect.
If that does NOT solve the problem then I suggest you read the following threads relative to the Ignition Switch which is a common cause of many different electrical issues on the C5:
diagnosis
http://forums.corvetteforum.com/1568186703-post64.html
removal
http://forums.corvetteforum.com/1571067145-post107.html
repair procedure
http://forums.corvetteforum.com/c5-t...ch-repair.html
Definitely go through the diagnosis step before repairing/replacing the ignition switch.
I would start with the grounds. Here are two links that will help you identify what is grounded at what location:
http://forums.corvetteforum.com/c5-t...locations.html
http://forums.corvetteforum.com/c5-t...tion-long.html Post #1
I would concentrate on grounds G103, G104, G106, G108.
Check and clean any that are suspect.
If that does NOT solve the problem then I suggest you read the following threads relative to the Ignition Switch which is a common cause of many different electrical issues on the C5:
diagnosis
http://forums.corvetteforum.com/1568186703-post64.html
removal
http://forums.corvetteforum.com/1571067145-post107.html
repair procedure
http://forums.corvetteforum.com/c5-t...ch-repair.html
Definitely go through the diagnosis step before repairing/replacing the ignition switch.
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