DTC B0069 Hummer
Multiple Engine Misfire Detected
Multiple Engine Misfire Detected
Description
Engine speed less than 4000 rpm, ECT and IAT sensors more than 18ºF, BARO sensor over 75 kPa, fuel level over 15%, TP angle change less than 1º in 10 ms, and the PCM detected the misfire rate during 200 or 1000 engine revolutions was more too high in more than one cylinder for 5 seconds after engine startup, or it was too high for one second of fuel shutoff. Note: If the misfire is severe, the MIL will flash on off on the 1st trip!
Cause and Solution
Air leak in the intake manifold, or in the EGR or PCM systemBase engine mechanical fault affecting 2 or more cylindersErratic or interrupted CKP or CMP sensor signalsFuel delivery component fault affecting 2 or more cylinders (i. e. , a contaminated, dirty or sticking fuel injector)Ignition system problem (coil or plug) affecting over 2 cylindersVehicle driven with low fuel pressure or while very low on fuel
Video Guide
Diagnostic Info
- DTC Code: B0069
- Brand: Hummer