Code Retrieval Prodecure
See GM trouble code retrieval procedure to retrieve the trouble codes.
The Check Engine light will light when the ECU stores a trouble code.
Counting the Flashes
To retrieve trouble codes, turn the ignition key to the "on" position with the engine OFF.
The Check engine light will flash many short blinks. The total number of blinks equals the code number. For example, flash,pause, flash,flash = code 12.If more than one code is stored, the Check engine light will flash the codes in sequence (lowest to highest) with a pause between each code. The codes will repeat until the key is turned to the OFF position.
1996-up models:
Are OBD2 systems and require a scanner to access the codes.
| 11 | Transaxle codes present |
| 12 | Diagnostic check only |
| 13 | Oxygen sensor circuit |
| 14 | Coolant sensor/high temperature |
| 15 | Coolant sensor/low temperature |
| 17 | PCM fault - pull-up resistor |
| 19 | 6X signal fault (92-95 models) |
| 21 | Throttle position sensor-voltage high |
| 22 | Throttle position sensor-voltage low |
| 23 | IAT circuit low |
| 24 | VSS circuit-no signal |
| 25 | IAT circuit-Temp out of high range |
| 26 | Quad driver output fault |
| 32 | EGR system fault |
| 33 | MAP sensor - voltage out of range high |
| 34 | MAP sensor - voltage out of range low |
| 35 | IAC - rpm out of range |
| 41 | Ignition control circuit-open or shorted |
| 42 | Bypass circuit - shorted or open |
| 41/42 | IC control circuit grounded/bypass open |
| 43 | Knock sensor circuit shorted or open |
| 44 | O2 sensor indicates lean condition |
| 45 | O2 sensor indicates rich condition |
| 46 | Power steeringpressure circit(91 models)open or shorted |
| 49 | High idle indicates vacuum leak |
| 51 | PCM memory error |
| 53 | System voltage error |
| 55 | A/D error |
| 58 | trans fluid temperature too high |
| 59 | Trans fluid temperature too low |
| 66/67 | A/C pressure sensor |
| 81 | ABS message fault |
| 82 | PCM internal communication fault |