Trouble Code Definition
ECM/PCM TROUBLE CODE DEFINITION
| Code No. |
Circuit Affected |
| 12 |
No RPM Reference Pulse |
| 13 |
Open Oxygen (O2) Sensor Circuit Open Left Oxygen (O2) Sensor Circuit (Corvette) |
| 14 |
CTS Signal Voltage Low |
| 15 |
CTS Signal Voltage High |
| 16 |
Low Resolution Pulse (Corvette) |
| 21 |
TPS Signal Voltage High |
| 22 |
TPS Signal Voltage Low |
| 23 |
MAT Sensor Signal Voltage High |
| 24 |
Vehicle Speed Sensor Circuit |
| 25 |
MAT Sensor Signal Voltage Low |
| 26 |
Quad-Driver Error Quad-Driver No. 1 Error (Corvette) |
| 27 |
Quad-Driver No. 2 Error (Corvette) |
| 28 |
Quad-Driver No. 3 Error (Corvette) |
| 32 |
EGR System Error |
| 33 |
MAP Sensor Signal Voltage High |
| 34 |
MAP Sensor Signal Voltage Low |
| 35 |
IAC Idle Speed Error |
| 36 |
Transaxle Shift Circuit High Resolution Pulse (Corvette) |
| 41 |
Opti-Spark EST Ckt Open Or Grounded (Corvette) |
| 42 |
EST Circuit Open Or Grounded Opti-Spark EST Circuit Grounded (Corvette) |
| 43 |
ESC Error |
| 44 |
Lean Exhaust Indication Left Lean Exhaust Indication (Corvette) |
| 45 |
Rich Exhaust Indication Left Rich Exhaust Indication (Corvette) |
| 46 |
Anti-Theft Sys Fault ("F" Body) Power Steering Pressure Switch |
| 51 |
Faulty PROM, MEM-CAL Or ECM/PCM |
| 52 |
Faulty/Missing CAL-PAC Or MEM-CAL Low Engine Oil Temperature (Corvette) |
| 53 |
System Overvoltage Anti-Theft System Fault |
| 54 |
Fuel Pump Voltage Low |
| 55 |
ECM/PCM Error Fuel Lean Monitor (Corvette) |
| 62 |
High Engine Oil Temperature (Corvette) |
| 63 |
Open Right Oxygen (O2) Sens Ckt (Corvette) |
| 64 |
Right Lean Exhaust Indication (Corvette) |
| 65 |
Right Rich Exhaust Indication (Corvette) |
| 66 |
A/C Pressure Sensor Circuit |
| 67 |
A/C Pressure Sensor (Corvette) |
| 68 |
Shorted A/C Clutch Relay Circuit (Corvette) |
| 69 |
A/C Clutch Circuit (Corvette) |
| 72 |
Gear Switch Circuit (Corvette) |
NOTE:
Use trouble code charts only if SERVICE ENGINE SOON light is illuminated (indicating a current problem exists). Exceptions are Code 13, 15, 24, 44 and 45 charts, which may be used to help diagnose intermittent codes. Anytime control module-related Codes 51, 52 or 55 are displayed with another code, start with 50-series code, and then proceed to lower numbered codes.