1996 Chevrolet Tahoe P1351 Code: Engine Temperature Issues and Check Engine Light Behavior
My 1996 Chevrolet Tahoe has had a persistent check engine light with the P1351 diagnostic code, indicating an ignition coil control circuit high voltage issue. Despite this, the vehicle starts and runs smoothly. I recently replaced the ignition coil as a preventive measure. Additionally, my thermostat has been stuck open for some time, preventing the engine from reaching its proper operating temperature. Over the past few weeks, with outdoor temperatures consistently in the high 90s to over 100°F, the check engine light turned off and has remained off. I'm wondering if this could be related to the engine coolant not reaching optimal temperature—since a lack of thermal regulation may affect sensor readings or ignition system performance. I came across a forum post suggesting that such conditions might influence P1351 behavior. Could poor engine temperature be contributing to the code's intermittent appearance?
I don't understand the connection you're suggesting—thermostat and coil? The P1351 code (for a 5.7L V8, VIN R, automatic transmission) refers to an ignition coil control circuit high voltage issue. First, I'd like to ask: have you installed a remote starter? Are there any instances of increased engine cranking when starting the vehicle? A user suggested a simple test: operate the car with a spare key (not the normal key) and observe if the P1351 code resets—this could help confirm whether the issue is related to ignition system behavior under different conditions. The test is easy to perform, and it might provide clarity without needing further explanation or technical details.