Can someone help me with this? I've got a 2002 C5 with some engine work (heads/cam/headers/exhaust). Car was running great last night ... got on it pretty hard for about an hour ... came home - everything was fine. Now it won't start and throwing the C1276 Code. It begins to turn over, but then stops ... silence. Any suggestons. Anything would be appriciated.
Thanks ... Stephanie

 

This is what the code means but I'm not sure if this info will help but I'm sure someone else will chime in.

"C1276 Delivered Torque Signal CKT malfunction"

Good Luck

 

ttt

Comon, someone has some more detail on this code??????

 

I haven't had this problem but I would make a big guess and say you may have lost one of the ground points in front with the engine and header work

Ground area 7 and 9 can cause this problem.




Circuit Description
Traction Control is simultaneously controlled by the EBCM and the PCM. The PCM sends a DELIVERED TORQUE message via a Pulse Width Modulated (PWM) signal to the EBCM confirming the delivered torque level for proper Traction Control system operation. The EBCM supplies the pull up voltage.

Conditions for Setting the DTC
DTC C1276 can be set anytime when ignition voltage is present. A malfunction exists if the PWM signal is out of range or no signal is received for a period of 7 seconds.

Action Taken When the DTC Sets
TCS/Active Handling (if equipped with RPO JL4) are disabled.


Indicators that turn on: Car Icon (TCS indicator)
Messages displayed on the DTC: Service Traction System
Service Active HNDLG (if equipped with RPO JL4)

Conditions for Clearing the DTC


Condition for DTC is no longer present and scan tool clear DTC function is used.
Fifty ignition cycles have passed with no DTCs detected.
Diagnostic Aids


It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction.
If an intermittent malfunction exists refer to Testing for Intermittent and Poor Connections in Diagrams, Diagnostic Aids.
Possible causes for DTC C1276 to set:
Open in CKT 464.
CKT 464 shorted to ground or voltage.
Communication frequency problem.
Communication duty cycle problem.
CKT 464 has a wiring problem, terminal corrosion, or poor connections.
EBCM not receiving information from the PCM.
Test Description
The numbers below refer to step numbers on the diagnostic table.


Checks for proper duty cycle.
Checks for proper frequency.

 

Wow ... thanks Richin Chicago! You sound like you know your stuff. Unfortunately, my brother came by to take a look and we made two attmepts to start (first one almost happened), but then there was a horrible metal sound like something let loose in the motor. BIGTIME! What you said makes since though ... the car flood damage ... which lead to a new motor and the mods. It has been running hot ever since I got it back ... not 10 months later the **** really hit the fan. Looks like it's flatbed time!
Thanks for the time ... let me know if you have any other info you feel would be helpful. I could use all I can get about now!
Stephanie

 

That might cause the code he's getting but it doesn't explain why the car won't start and based on what his last post said it sounds pretty serious, when you say the car has run hot ever since the new motor was put in how hot are you talking?

 

Wow,good luck!

 

The car has sporatically been running hot at temp's ranging from the upper 230's to the hottest at 253 degrees. I think it could possibly be the timing chain.

FOR ALL NEEDING SERVICE ... AVOID COURTESY CHEVROLET IN HOUSTON LIKES IT'S THE PLAGUE.

I truly believe their messy work is directly related to all the problems I've had ... and by the way, I'm a SHE! Thanks so much for all your time and if requested, I will post the actual diagnosis once I revcieve it from MTI.

 

The only reason I asked about your temps is because if your tune is too far on the lean side your car will run hot until you finally blow it up

 

What is too lean, and if this is the case (that the car has been running too lean for too long) ... do you think it would "blow up" the way mine did ... a metal sound? I know this reply is a bit all over the place, but I am confused. I should know more tomorrow after MTI checks it out. When you mean 'blow up' ... could that be the timing chain falling off or blowing a head gasket? I instructed them not to attempt to start it becuase if it is the timing chain ... that additional start could bend a valve if one hasn't been bent already. Again ... any input is very appriciated.

Much love ... Stephanie