ODI #11765761
Filed 09/21/2026 · Incident 09/10/2026
ELECTRICAL SYSTEM · VEHICLE SPEED CONTROL
On September 10, 2026, while traveling approximately 60+ mph in the passing lane, my 2018 Chevrolet Silverado 1500 suddenly lost normal acceleration and entered Reduced Engine Power mode. Vehicle speed dropped to approximately 40 mph, and pressing the accelerator would not provide normal power. This created a safety concern while traveling at highway speed. On September 11, OnStar On-Demand Diagnostics documented ECM code P2138 (Accelerator Pedal Position Sensor 1-2 Correlation) and ABS code U0422. The TCM reported no error codes. The check-engine light later turned off, indicating the problem is intermittent. GM Technical Service Bulletin 07-06-04-019F addresses intermittent P2138 with Reduced Engine Power and possible water intrusion/corrosion affecting the accelerator pedal position circuit. After removing the driver’s kick panel, we observed evidence of previous moisture/rust in the area, but the exact cause has not yet been diagnosed. The vehicle is scheduled for diagnosis by a Chevrolet dealer. I am reporting this because the sudden loss of acceleration at highway speed created a safety hazard and to document the incident for potential defect-trend investigation.