NEED HELP ANY INFO WOULD BE GREAT !
I HAVE A 2008 Z06 WITH 3500 MILES ON IT,ORGINAL OWNER
EVER SINCE I HAD THIS CAR THIS HAS HAPPEN I WILL BE DRIVNG AND THE POWER IS GREATLY REDUCE AND A GET THE MESSAGE SERVICE TRACTION SYSTEM YOU DON"t known when it will happen
then you shut car off wait a few minutes then every thing is back to normal.p2138 code I get is to replace gas peddle throttle system and sensors so I did this I late spring. yesterday I am going to a vette show it happen again I am totally lost what should I do going to my local chevy dealer maybe they could help like I said any info would be great car is in jersey if you have a super mechanic lmk

thanks

 

You have two forum vendors who are tuners, one in the north (Cartek-Garwood) and one in the southerly portion (ECS-Cream Ridge). You may want to call either one closest to you. I've had that before but the gas pedal replacement solved the problem on my base C6 (non-Z06).

 

If you are the original owner and this has been happening since you purchased the car why didn't you have it fixed under the B2B warranty?

As it is the problem could be in the ECM, the Accelerator Position Sensor, or the wiring in between. Here is a diagnostic showing the steps required to determine where the failure may be:

Circuit/System Testing
Ignition OFF, disconnect the harness connector at the accelerator pedal. Allow at least 60 seconds for the ECM to power down. This can be verified by a loss of communication message on the scan tool.
Test for less than 5 ohms of resistance between each low reference circuit terminals A and D and ground.
⇒ If greater than 5 ohms, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.

Ignition ON, test for 4.8-5.8 volts between each 5-volt reference circuit terminals C and F and ground.
⇒ If less than 4.8 volts, test the affected 5-volt reference circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the ECM.

⇒ If greater than 5.2 volts, test the affected 5-volt reference circuit for short to voltage. If the circuit test normal, replace the ECM.

Ignition ON, verify the scan tool APP sensor 1 and 2 voltages are less than 0.1 volt.
⇒ If greater than 0.1 volt, test the APP sensor 1 and 2 signal circuits terminals B and E for a short to voltage. If the circuit tests normal, replace the ECM.

Install a 3A fused jumper wire between the signal circuit terminal E and the 5-volt reference circuit terminal F of the APP sensor 1. Verify the scan tool parameter APP sensor 1 voltage is greater than 4.8 volts.
⇒ If less than 4.8 volts, test the APP sensor 1 signal circuit for an open or short to ground. If the circuit tests normal, replace the ECM.

Install a 3A fused jumper wire between the signal circuit terminal B and the 5-volt reference circuit terminal C of the APP sensor 2. Verify that the scan tool parameter APP sensor 2 voltage is greater than 4.8 volts.
⇒ If less than 4.8 volts, test the APP sensor 2 signal circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the ECM.

Ignition OFF, disconnect the harness connector at the ECM.
Test for less than 5 ohms of resistance on all APP sensor circuits between the following terminals:
• ECM X1 signal circuit terminal 29 to APP terminal E

• ECM X1 signal circuit terminal 32 to APP terminal B

• ECM X1 5-volt reference circuit terminal 36 to APP terminal C

• ECM X1 5-volt reference circuit terminal 56 to APP terminal F

⇒ If greater than 5 ohms, repair the affected circuit for an open/high resistance.

Test for infinite resistance between APP sensor 1 signal circuit terminal E and APP sensor 2 signal circuit terminal B.
⇒ If less than infinite resistance, repair the short between APP sensor 1 signal circuit and APP sensor 2 signal circuits.

If all circuits test normal, test the APP sensor. Refer to Component Testing for instructions.
⇒ If the APP sensor tests normal, replace the ECM.


Bill