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2014 Chevrolet Silverado 1500 Misfire Diagnosis: P0307 and P0300 with Traction Light On

Model: 2014 Silverado 1500 Fault Code: P0300 Posted: 2018-09-11 10:52

The traction light is illuminated with a flashing check engine light. Diagnostic code P0307 is present, indicating a misfire in cylinder #7. The spark plug in cylinder #7 was found to be wet, suggesting poor combustion. After swapping the coil pack from cylinder #7 to cylinder #1, the fault shifted to P0300 (random/multiple cylinder misfire), which indicates the issue may not be isolated to a single cylinder. The vehicle runs more smoothly when the transfer case is disabled, pointing toward potential drivetrain or transmission-related interference. I suspect that simply replacing the coil, wire, or plug will not resolve this issue. My OBD2 scanner does not detect advanced diagnostic codes. Given the persistent traction light and misfire, there may be an underlying mechanical problem such as a faulty valve lifter or compression loss in cylinder #7. A leak-down test on cylinder #7 is recommended to confirm engine integrity.

Related fault codes
P0300P0307
Comments (3)
Anonymous 2018-09-11 11:12

Try swapping the coil pack for cylinder #7 and monitor if the misfire code follows. This can help determine whether the issue lies with the ignition component or another system.

Anonymous 2018-09-11 11:19

I swapped out the coil, wire, and spark plug in cylinder #7 — the problem remained in that same cylinder. The traction light is still on, which raises concerns about potential drivetrain or engine-related faults.

Anonymous 2018-09-11 11:42

The traction light is likely triggered by the misfire condition. It should turn off once the root cause of the misfire is resolved. A major concern is driving with a flashing check engine light, as it may lead to damage to the catalytic converter due to unburned fuel. It's advisable to perform a leak-down compression test on cylinder #7 to assess for internal mechanical issues. A faulty valve lifter could be a contributing factor. There are many detailed discussions available on Chevrolet Silverado 1500 forums.