Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
BUICK, CADILLAC, CHEVROLET, GMC
Reported code forms P0300
This Preliminary Information communication provides information to the technician with information about vehicles that misfires or roughness on cold start up. Technician may find Diagnostic Trouble Code P0300 set.…
BUICK, CHEVROLET, PONTIAC
Reported code forms P0300
BUICK/CHEVROLET/PONTIAC: EXCESSIVE OIL CONSUMPTION AND/OR BLUE EXHAUST SMOKE. ITS MORE APPARENT WHEN DRIVING HIGHWAY SPEED. RARE INSTANCES, A SES LIGHT AND ENGINE MISFIRE MAY BE ENCOUNTERED WITH A P0300 DTC. *PE UPDATED…
CHEVROLET, PONTIAC, SATURN
Reported code forms P0300
ROUGH ENGINE IDLE, MISFIRE (DTC P0300) OR NOISE FROM ENGINE COMPARTMENT. *NJ UPDATED 6/11/10. *PE
CHEVROLET, PONTIAC, SATURN
Reported code forms P0300
SERVICE ENGINE SOON LIGHT ILLUMINATED AND DTC P0011, P0016, P0300. EQUIPPED WITH 3.5L LZE, LZ4 (VIN CODES K, N) AND 3.9L LZ9, LZG, LGD ENGINE (VIN CODES 1, 3, W). *NJ
BUICK, CHEVROLET, PONTIAC, SATURN
Reported code forms P0300
SERVICE ENGINE SOON LIGHT ILLUMINATED AND DTC P0011, P0016, P0300. EQUIPPED WITH 3.5L LZE, LZ4 (VIN CODES K, N) & 3.9L LZ9, LZ8, LGD ENGINE (VIN CODES 1, R, W). *NJ
BUICK, CHEVROLET, OLDSMOBILE, PONTIAC
Reported code forms P0300
CROSS INJECTOR WIRES CAUSING MISFIRE AT STEADY STATE SPEED AND RPM, MALFUNCTION INDICATOR LAMP (MIL) ILLUMINATED, AND A P0300 SET. SIT BULLETIN 1460291. *TT