I have a 98 C5. Im getting P1571 "ASR Desired Torque" in 10-PCM and C1277 "Requested Torque Signal CKT Malfunction" in 28-TCS. First off, are these related (they seen to come up at the same time) and second, do I really have to worry about this or just let it SLIDE? When these happen it alway kick my "Service Active Traction" in the DIC. Im hoping this is just something that I can let slide. If not, how do I go about fixing it. Im no good with cars and my Dealer says THEY CANT HELP ME... Is there anyone (a shop or dealer) in the Chicago Land area that can help me??? :mad

 

The codes are related. Did you do any programming to your PCM? What mods are done to your car?

 

I dont even know what that stuff is :confused: I have had the car for 2 months. I am a virgin at all this stuff. Im sure there really hasent be anything done to the car.

 

Find a different dealer! Any Chevy dealer should be able to work this, I know it isn't your year but the DTC fault codes are on page 5-161 of the 2003 Service Manual. If they can't help you on this, then stay away and tell your friends to do likewise.

The Electronic Brake Control Module (EBCM) and the Powertrain Control Module (PCM) simultaneously control traction control. Spark timing is retarded or fuel injectors are selectively turned off by the PCM. The EBCM actively applies the brakes to the front wheels in order to reduce torque.

When these modules can't or have difficulty communicating with each other the C1277 and P1571 faults are set. C1277 means the PCM has sent a serial message to the EBCM that a fault exists. P1571 means that the PCM has detected a signal from the EBCM that is out of its valid range OR the PCM does not receive a signal from the EBCM.

Likely causes are:
- An open in the requested torque circuit.
- A short to ground or short to voltage in the requested torque circuit.
- Wiring problem, terminal corrosion, or poor connection in the requested torgue circuit.
- Commmunication frequency problem.
- PCM is not receiving data from EBCM.
- Loose or corroded EBCM or PCM ground.

The Service Manual has specific fault isolation checklists for all DTC codes. The dealer therefore has step-by-step fault isolation and correction information in hand. Why they told you they couldn't help :confused: , but I would take them at their word and STAY AWAY!

Maybe someone from Chicago can suggest a dealer, you might search recent and archive posts.

Don't let this stuff slide, you want the car to perform as it should. You might want to get access to a Service Manual for your year, even if you are not going to do the work yourself, you can get an appreciation of how simple or complex a job is likely to be.

Good luck!


[Modified by mapman, 12:31 AM 6/23/2003]


[Modified by mapman, 11:28 AM 6/23/2003]

 

Thanks Mapman... Im going to print this out and take it to a different dealer in my area :)

 

Please tell me that's not a GM dealership! Got to be a used car dealer, right.

Bob

:flag

 

Ya it was a GM Dealer...I bought the car from them :confused:

 

It's hard to imagine a dealer saying he can't help you. Did he say why? I agree with the other posts that you should stay far, far away from that dealership. I've had dealers say they couldn't duplicate an intermittant problem, but I've never had one say they couldn't help me.

Bob
:flag