![]() GM has issued a service bulletin 11-06-04-007C to address a P2135 Chevy reduced engine power trouble in the vehicles listed below. P2135 Chevy P2135 Chevy reduced engine power. ![]() ![]() WTF Trouble code P2135 again!!! Thread starter llllljrlllll Start date Prev. WTF Trouble code P2135 again!!! Thread starter. I was wondering if there is any troubleshooting I can do for this problem. When they read the code it was a P2135 throttle position sensor. My wife went out today and got into her car and the service engine light came on along with the traction control along with reduced power message. Thanks for your short write up and input. The problem that I am experiencing is engine surging The problem that I am experiencing is engine surging.GM has issued a service bulletin 11-06-04-007C to address a P2135 Chevy reduced engine power trouble in the vehicles listed below.P0741 Avalanche Colorado Express Silverado Suburban Tahoe Trailblazer P2135 Chevy P2138 Reduced Power on GM vehicles Passlock wiring diagram Power seat trouble codes, B1770, B1850. “TAC Data” (both the TP and pedal position sensors fall under the electronic throttle actuator, or TAC, system) 2. With your car idling in Park, use an OBD2 scan tool to view the voltage output data from the two TP sensors.
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