ECM Trouble Code Definitions
ECM TROUBLE CODE DEFINITION
| Code No. | Circuit Affected | ||
|---|---|---|---|
| 12 (1) | No RPM reference pulse. | ||
| 13 | Open oxygen sensor circuit. | ||
| 14 | Coolant sensor circuit shorted. | ||
| 15 | Coolant sensor circuit open. | ||
| 21 | TPS signal voltage high. | ||
| 22 | TPS signal voltage low. | ||
| 23 | MAT voltage high. | ||
| 24 | VSS circuit. | ||
| 25 | MAT sensor signal voltage low. | ||
| 32 | EGR vacuum control signal. | ||
| 33 | MAP sensor voltage high. | ||
| 34 | MAP sensor voltage low. | ||
| 35 | IAC (EFI) speed error. | ||
| 36 | MAF Sensor Burn-Off (5.0/5.7L) | ||
| 41 | No distributor reference (HEI). C(3)I ignition - cam sensor loss. Cylinder select error (MEM-CAL). | ||
| 42 | EST circuit open or grounded. | ||
| 43 | ESC retard signal too low. | ||
| 44 | Lean oxygen sensor value. | ||
| 45 | Rich oxygen sensor value. | ||
| 51 | Faulty PROM, MEM-CAL or ECM. | ||
| 52 | Faulty/missing CALPAC or MEM-CAL. | ||
| 53 | Faulty alternator, voltage high. | ||
| 54 | Fuel pump voltage low. | ||
| 55 | Faulty ECM. | ||
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NOTE:
Trouble code charts should only be used 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.
NOTE:
Any time Codes 51, 52, 54 or 55 are displayed with another code, start with "50-series" code first, then proceed to low profile numbered code.