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Engine Controls - Tests W/Codes Expand All (for easy ctrl-f) Collapse All Introduction Self-Diagnostic System Diagnostic Code Charts Notes Diagnostic Circuit Check Chart A-1, Won't Flash Code 12, No Mil Chart A-2, No DLC Data Or Won't Flash Code 12, Mil On Steady Code 13, Non-Heated Oxygen (O2) Sensor CTK, Open CKT (VIN 6) Code 13, Heated O2 Sensor Circuit, Open Circuit (VIN 8) Code 14, ECT Circuit High/Low Temperature Indicated CODE 21, TP SENSOR CIRCUIT, SIGNAL VOLTAGE HIGH/LOW (1 Of 2) Code 21, TP Sensor Circuit, Signal Voltage High/Low (2 Of 2) Code 23, IAT Sensor Circuit, High/Low Temperature Indicated Code 24, Vehicle Speed Sensor (VSS) Circuit Code 32, EGR System Error (CALIF. Only) CODE 33, MAP SENS CKT, SIGNAL VOLT HIGH/LOW - LOW/HIGH VACUUM (1 Of 2) CODE 33, MAP SENS CKT, SIGNAL VOLT HIGH/LOW - LOW/HIGH VACUUM (2 Of 2) Code 42, Ignition Control (Ic) Circuit Error Code 44, Non-Heated O2 Sens CKT, Lean Exhaust INDC'T (VIN 6) Code 44, Heated O2 Sens CKT, Lean Exhaust Indicated (VIN 8) Code 45, Non-Heated O2 Sens CKT, Rich Exhaust Indicated Code 45, Heated O2 Sens CKT, Rich Exhaust Indicated (VIN 8) Code 51, ECM Failure, ECM Failed Or EEPROM Failure Summary