P0175 Diagnostic Issue on 2011 Chevrolet Tahoe After Front End Collision
I own a 2011 Chevrolet Tahoe with 45,000 miles and has been garage kept with minimal use. It has never had any prior issues until August 2017, when it sustained a minor front-end impact on the driver's side fender. The vehicle was repaired by Service King and subsequently began running roughly. After checking the diagnostic codes, I found P0175 — indicating a rich fuel condition in Bank 2 (passenger-side engine). Initial troubleshooting pointed to the Accelerator Pedal Position (APP) sensor, which I replaced once. For several months, the vehicle ran smoothly. However, the check engine light returned and the same P0175 code reappeared. I later replaced the APP sensor a second time after consulting this forum, where users suggested that a bad APP sensor could cause inconsistent throttle response. Despite this, the issue persisted. Recently, I received a diagnosis from Goodyear indicating a faulty APP sensor — leading me to replace it for the third time within just 1.5 years. The vehicle has seen less than 1,500 miles since the accident, yet the problem continues to recur every few months. This raises concerns: is there a root cause related to the collision? Could heat or electrical stress from the impact be damaging the sensor repeatedly? I'm seeking clarity on how to properly diagnose this recurring issue and whether the APP sensor is actually the source of P0175, as technical sources indicate that APP sensors primarily affect throttle control, not fuel mixture richness. I suspect a deeper underlying problem — possibly wiring issues or a faulty air intake system — that may be masked by the APP sensor failure. I am now planning to take it to an ASE-certified diagnostic shop with proper equipment and expertise to perform a full circuit analysis, including voltage checks and signal validation using a lab scope. Any insights into how to identify whether the APP sensor is truly at fault or if another component (like the Mass Air Flow Sensor) should be investigated would be greatly appreciated.
The P0175 code specifically affects Bank 2, so focus your troubleshooting on the passenger-side engine. Confirm that the issue is isolated to that side and not affecting both banks. For more details, refer to official OBD-II documentation for P0175.