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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.
P1700....Malfunction Indicator Lamp requested by trans control module
P1701....Malfunction Indicator Lamp request circuit
P1740....Torque control/management request circuit
P1760....Transmission Control Module supply voltage interrupted
P1780....Park/Neutral Position Switch circuit
P1781....Engine torque signal circuit
P1792....ECM to Transmission Control Module engine coolant signal
P1800....ECM to Transmission Control Module engine coolant signal
P1810....ATF pressure manual valve powition switch malfunction
P1811....Long shift and maximum adaptation limit reached
P1812....TOT condition
P1814....Torque converter clutch (TCC) overstress
P1819....Transmission range switch out of range, possible no start
P1820....Transmission range switch A voltage low
P1822....Transmission range switch B voltage high
P1823....Transmission range switch P voltage low
P1825....Transmission range switch A, B, C & P signals invalid
P1826....Transmission range switch C voltage high
P1835....Kickdown Switch circuit
P1842....1-2 Shift Solenoid circuit low input
P1843....1-2 Shift Solenoid circuit high input
P1845....2-3 Shift Solenoid circuit low input
P1847....2-3Shift Solenoid circuit high input
P1850....Brake Band Aply Solenoid
P1860....Torque Converter Clutch (TCC) PWM Solenoid circuit
P1864....TCC Enable Solenoid circuit
P1868....Transmission Fluid life
P1870....Transmission component slipping
P1873....Oxygen sensor bank 2 sensor 2 crosscounts
P1874....Oxygen sensor bank 1 sensor 3 crosscounts
P1875....4WD Low Switch circuit electrical
P1886....Transaxle Shift, Timing Solenoid performance
P1887....TCC Release Switch malfunction
P1890....Throttle Position signal input
P1891....Throttle position sensor circuit signal low
P1892....Throttle position sensor circuit signal high
P1895....Engine torque delivered circuit
Click Here for List of GM Codes P1000 to P1299
Click Here for List of GM Codes P1300 to P1499
Click Here for List of GM Codes P1500 to P1699
