2005 Trailblazer P2138 Code: Limp Mode After Throttle Body and Accelerator Replacement
I own a 2005 Chevrolet Trailblazer with persistent OBD2 fault codes P0641, P2138, and P2135. I've already replaced the accelerator pedal and throttle body, and installed new wiring from the throttle body to the accelerator pedal assembly. Despite these repairs, my vehicle remains in limp mode. Any additional troubleshooting steps or diagnostic advice for resolving the P2138 code specifically? The issue appears to be related to throttle position sensor or signal integrity, but I'm unsure of the exact root cause.
Installing new wires from the Throttle Body (TB) to the Accelerator Pedal Position (APP) is a common fix—ensure proper connections and grounding. However, focus on diagnosing P0641 first as it may be causing downstream issues. For detailed information, refer to: https://www.obd-codes.com/p064-1