P300. Diagnostic Trouble Code Discussion for May 2026
Engine misfire
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| Help Request | Posted | |
| 2014 Cadillac CTS Luxury 3.6L Excessive Emissions, Poor Idle Quality, Surge, Misfire, MIL Lamp on VIN: 1G6DD1E33E P300.: Engine misfire. start car - misfire / backfire / stumble.. As it continues to run it starts to balance out.. car running smooth but find ST fuel trim at 0 and fixed .. LT fuel trim fixed at 40.. Check air box / air filter / intake hose / hoses and tubes on motor = all loo... |
May 27, 2026 | |
| 2014 Cadillac CTS Luxury 3.6L Excessive Emissions, Poor Idle Quality, Surge, Misfire, MIL Lamp on VIN: 1G6DD1E33E P300.: Engine misfire. start car - misfire / backfire / stumble.. As it continues to run it starts to balance out.. car running smooth but find ST fuel trim at 0 and fixed .. LT fuel trim fixed at 40.. Check air box / air filter / intake hose / hoses and tubes on motor = all loo... |
May 28, 2026 |
