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Diagnostic Trouble Code numbers are read by plugging a code reader or scan tool into the vehicle diagnostic connector (usually located under the instrument panel near the steering column) that can read vehicle manufacturer enhanced or P1 c odes (not just generic or P0 codes). The presence of a code will turn on the Check Engine Light. The light will remain on until the code has been erased. The code number does not tell you which part has failed. It only indicates a possible fault has been detected in the circuit, system or sensor described. Further testing is usually required to isolate the fault BEFORE repairs are made.
For vehicle specific diagnostic charts and vehicle specific repair information, refer to a service manual, or get a subscription to the AC Delco Tech Info website.
The following is a partial listing of common General Motors specific "P1" enhanced OBD II fault codes:
NOTE: For some code numbers, there may be more than one definition because the same number may be used for different faults on different model years or models.
P1300....Ignition coil 1 primary feedback circuit
P1305....Ignition Coil 2 primary feedback circuit
P1310....Ignition Coil 3 primary feedback circuit
P1315....Ignition Coil 4 primary feedback circuit
P1320....Distributorless ignition 4X signal intermittent
P1321....Electronic ignition system fault
P1322....Electronic ignition system control missing
P1323....Loss of high resolution rpm signal
P1324....Crank rpm too low
P1335....Crankshaft positioning sensing circuit
P1336....Crankshaft position system variation not learned
P1345....Camshaft to crankshaft position correlation fault
P1346....Crankshaft sensor system variation not learned, or intake camshaft position out of range
P1349....Intake Camshaft position system
P1350....Ignition control system
P1351....Ignition control circuit voltage high
P1351....Ignition control circuit open
P1352....Bypass circuit open or voltage high
P1353....Ignition control output high/pulse detected when ground cylinder #3
P1354....Ignition control output high/pulse detected when ground cylinder #4
P1355....Ignition control output high/pulse detected when ground cylinder #5
P1356....Ignition control output high/pulse detected when ground cylinder #6
P1357....Ignition control output high/pulse detected when ground cylinder #7
P1358....Ignition control output high/pulse detected when ground cylinder #8
P1359....Ignition Coil group 1 control circuit
P1360....Ignition Coil group 2 control circuit
P1361....Ignition control cylinder #1 not toggling after enable,or low voltage
P1362....Ignition control cylinder #2 not toggling after enable,or low voltage, or bypass circuit shorted or low voltage
P1363....Ignition control cylinder #3 not toggling after enable,or low voltage
P1364....Ignition control cylinder #4 not toggling after enable,or low voltage
P1365....Ignition control cylinder #5 not toggling after enable,or low voltage
P1366....Ignition control cylinder #6 not toggling after enable,or low voltage
P1367....Ignition control cylinder #7 not toggling after enable,or low voltage
P1368....Ignition control cylinder #8 not toggling after enable, or low voltage
P1370....Too many ignition reference pulses
P1371....Too few ignition reference pulses
P1372....Crankshaft Position Sensor A-B correlation ( Click Here for help troubleshooting Crankshaft Position Sensors)
P1374....Crankshaft position sensor, 3X Reference circuit
P1375....24X Reference circuit voltage too high
P1376....Reference voltage low, or ignition ground circuit
P1377....Ignition control module CAM pulse to 4X reference pulse comparison
P1380....ABS rough road/misfire diagnosis prevented
P1381....Misfire detected, no EBCM/PCM serial data
P1401....Exhaust Gas Recirculation flow test fault ( Click Here for help troubleshooting EGR problems)
P1403....Exhaust Gas Recirculation Solenoid 1 error
P1404....Exhaust Gas Recirculation Solenoid 2 error
P1405....Exhaust Gas Rrecirculation Solenoid 3 error
P1406....Exhaust Gas Recirculation pintle position error
P1407....EGR valve air leak
P1408....EGR valve vacuum failure
P1409....EGR valve vacuum leak
P1410....EGR valve vacuum restriction, or fuel tank pressure system
P1415....AIR system Bank 1
P1416....AIR system Bank 2
P1431....Fuel Level Sensor 2 circuit
P1432....Fuel Level Sensor 2 circuit low voltage
P1433....Fuel Level Sensor 2 circuit voltage high
P1441....EVAP Canister continuous open purge flow,or high voltage during non-purge (Click Here for help diagnosing EVAP faults )
P1442....EVAP monitor circuit/vacuum switch high voltage
P1450....Barometric Pressure Sensor (BARO) circuit
P1451....Barometric Pressure Sensor performance
P1460....Cooling Fan control system, or misfire detected (Catera only) ( Click Here for help troubleshooting Cooling Fan problems)
P1483....Engine cooling system performance ( Click Here for help troubleshooting causes of Engine Overheating)
Click Here for List of GM Codes P1000 to P1299
Click Here for List of GM Codes P1500 to P1699
Click Here for List of GM Codes P1700 to P1899
