2 Digit OBDI DTC's

[LilYellowZQ8]

GM 2 Digit codes for 82 and up

Code -Code Definition
12- Diagnostic Mode
13- 02 Sensor or circuit
14- Coolant sensor or circuit/ high temp indicated
15- Coolant sensor or circuit/ low temp indicated
16- System voltage out of range
19- Crankshaft position sensor or circuit
21- Throttle position sensor or circuit- voltage high
22- Throttle position sensor or circuit- voltage low
23- Mixture control (M/C) solenoid or circuit (carbureted models)
23- Manifold Air Temperature (MAT) sensor or circu(1990 and earlier models)
23- Intake Air Temperature (IAT) sensor Circuit (fuel-injected models)
23- Intake Air Temperature (IAT) sensor Circuit (fuel-injected models)
24- Vehicle Speed Sensor (VSS) or circuit
25- Manifold Air Temperature (MAT) sensor or circuit – high temperature indicated (1990 and earlier models)
25- Intake Air Temperature (IAT) sensor or circuit – high temperature indicated (1991 and later models)
26- Quad Driver module circuit
27- Quad Driver module circuit
28- Quad Driver module circuit
29- Quad Driver module circuit
31- Park/Neutral Position (PNP) switch circuit
32- BARO sensor or circuit (carbureted models)
32- EGR circuit (fuel-injected models)
33- Manifold Absolute Pressure (MAP sensor signal voltage high
33- Mass Air Flow (MAF) sensor or circuit – excessive airflow indicated
34- Manifold Absolute Pressure (MAP) sensor signal voltage low
34- Mass Air Flow (MAF) sensor signal – low airflow Indicated
35- Idle Speed Control (ISC) switch or circuit (shorted) (carbureted models)
35- Idle Air Control (IAC) valve/ circuit
38- Brake Switch Circuit
39- Torque converter clutch (TCC) circuit
41- No distributor signals to ECM, or faulty ignition module ( Carbed Models)
41- Cylinders select error- MEM-CAL or ECM problem ( Fuel-injected models
41- Cam sensor circuit (3.8 engine)
42- Bypass or Electronic Spark Timing (EST) circuit
43- Low voltage at ECM terminal L (carbureted models)
43- Knock sensor circuit
44- Oxygen sensor or circuit – lean exhaust detected
45- Oxygen sensor or circuit – rich exhaust detected
46- Power steering pressure switch circuit
48- Misfire diagnosis
51- PROM, MEM-CAL or ECM problem
52- CALPAK or ECM problem
53- EGR fault (carbureted models only)
53- System over-voltage (ECM over 17.7 volts)
54- Mixture Control (M/C) solenoid or circuit (carbureted models)
54- Fuel pump circuit (1986 and later models)
55- Oxygen sensor circuit or ECM
55- Fuel lean monitor (2.2L engine)
61- Oxygen sensor signal faulty (possible contaminated sensor)
62- Transaxle gear switch signal circuits
63- Manifold Absolute Pressure (MAP) sensor voltage high (low vacuum detected)
64- Manifold Absolute Pressure (MAP) sensor voltage low (high vacuum detected)
66- pressure sensor or circuit Air conditioning