# P0300 on the 1999 GMC Sierra

The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.

Nobody has written a description of this code yet.

## Bulletins for this model year that name P0300

- [10112697](https://open.wenmarpro.com/bulletins/10112697), 2017-08-15: This Preliminary Information communication provides information to the technician about vehicles that have a Service Engine Soon Malfunction Indicator Lamp on, engine misfire, and/or engine noise. Technician may find Diagnostic Trouble Codes P0300\-P0308. If published Service Information diagnostics does not isolate the cause of this concern technician should check for a worn camshaft lobe and/or lifter roller, a sticking valve, valve leakage, a broken valve spring, and a collapsed active fuel management lifter.
- [10010375](https://open.wenmarpro.com/bulletins/10010375), 2004-11-17: SERVICE ENGINE SOON LIGHT AND P0300 WHEN TOWING, CRUISING UPHILL OR ON HARD ACCELERATION. \*TT
- [10010364](https://open.wenmarpro.com/bulletins/10010364), 2004-11-17: CHECK ENGINE LIGHT WITH A P0300 DUE TO 2\-4 CYLINDERS MISFIRING ON THE SAME BANK OF THE ENGINE. \*TT
- [10009666](https://open.wenmarpro.com/bulletins/10009666), 2004-10-14: SERVICE ENGINE SOON LIGHT WITH A P0300 MISFIRE DUE TO MISFIRES MAINLY ON CYLINDER 7. \*TT
- [10005439](https://open.wenmarpro.com/bulletins/10005439), 2004-02-27: MALFUNCTION INDICATOR LAMP ON WITH A P0300 SET AND A MISFIRE. VARIOUS MODELS INCLUDING 1996 \- 1999 P32 MODELS. SIT BULLETIN 1416475. \*TT
- [10004223](https://open.wenmarpro.com/bulletins/10004223), 2003-11-22: MALFUNCTION INDICATOR LAMP ON WITH A P0300 SET AND A MISFIRE. VARIOUS MODELS INCLUDING THE 1996\-1999 P32 AND THE 1996\-2002 GMC C/K TRUCK. \*TT
- [614354](https://open.wenmarpro.com/bulletins/614354), 2000-10-11: SOME DRIVERS MAY COMMENT ABOUT THE SERVICE ENGINE SOON LAMP ILLUMINATING. THE POWERTRAIN CONTROL MODULE MAY HAVE STORED A DIAGNOSTIC TROUBLE CODE P0300, ENGINE MISFIRE DETECTED. \*TT