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1997 Chevy Silverado 1500 Multiple Trouble Codes: P0157, P0300, P1380 with Dim Tail/Reverse Lights After Fuel Pump Replacement

Model: 1997 Chevy 1500 Silverado Fault Code: P0157 Posted: 2017-01-01 20:06

My son's 1997 Chevrolet Silverado 1500 (5.7L V8 engine) has developed multiple diagnostic trouble codes after a recent fuel pump replacement: P0157 (O2 Sensor Bank 2, Sensor 2), P0300 (Multiple Misfire), and P1380 (ABS Rough Road Misfire). Additionally, the rear tail and reverse lights are malfunctioning — they remain dim even after bulb replacement, and the reverse lights activate when the brakes are applied. I am concerned whether these electrical lighting issues are related to the engine trouble codes. The symptoms began immediately following the fuel pump installation. Could there be a connection between the faulty lights and the O2 sensor or misfire codes? I would appreciate advice on how to diagnose this issue systematically, especially since the vehicle is an older model with known wiring sensitivity.

Related fault codes
P0157P0300P1380
Comments (2)
Anonymous 2017-01-02 05:31

The electrical harness may be damaged, particularly near the rear lighting and O2 sensor connections. This could explain both the dim tail lights and misfire codes.

Anonymous 2017-01-02 09:44

P0157 and P0300 are likely related — both point to issues in the exhaust system or fuel delivery, possibly indicating a lean condition or sensor failure. P1380 is a separate issue that may not directly affect engine performance but could be triggered by electrical faults. The dim tail/reverse lights might be contributing to this code — consider if there's an underlying power supply or ground fault in the lighting circuit. For Problem A (O2 sensor and misfire): Use a scan tool to check Bank 2 Sensor 2 voltage, review freeze frame data, ensure no exhaust leaks exist, and verify fuel trim values are within normal range. Perform a vacuum leak test and inspect wiring and connectors at B2S2. For Problem B (lighting issues): A simple SWAG is whether the vehicle has a trailer connector — if so, it may be interfering with power circuits. Confirm whether the fuel pump was an OEM unit or aftermarket; if aftermarket, ensure proper wiring harness integration was completed. Also verify that no electrical connections were improperly plugged in during installation.