ECM/PCM Code Description

ECM diagnostic codes cause the "SERVICE ENGINE SOON" lamp to illuminate.

13 Left Oxygen Sensor Circuit (Open)

14 Coolant Temperature Sensor (CTS) Circuit (High Temperature Indicated)

15 Coolant Temperature Sensor (CTS) Circuit (Low Temperature Indicated)

16 OPTI-SPARK Ignition Timing System (Low Resolution Pulse)

21 Throttle Position Sensor (TPS) Circuit (Signal Voltage High)

22 Throttle Position Sensor (TPS) Circuit (Signal Voltage Low)

23 Intake Air Temperature (IAT) Sensor Circuit (Low Temperature Indicated)

24 Vehicle Speed Sensor (VSS) Circuit

25 Intake Air Temperature (IAT) Sensor Circuit (High Temperature Indicated)

26 Quad-Driver Module (QDM) #1 Circuit

27 Quad-Driver Module (QDM) #2 Circuit

28 Quad-Driver Module (QDM) #3 Circuit

32 Exhaust Gas Recirculation (EGR) Circuit

33 Manifold Absolute Pressure (MAP) Sensor Circuit (Signal Voltage High - Low Vacuum)

34 Manifold Absolute Pressure (MAP) Sensor Circuit (Signal Voltage Low - High Vacuum)

36 OPTI-SPARK Ignition Timing System

41 Electronic Spark Timing (EST) Circuit (Open or Shorted)

42 Electronic Spark Timing (EST) Circuit (Grounded)

43 Electronic Spark Control (ESC) Circuit

44 Left Oxygen (O2) Sensor Circuit (Lean Exhaust Indicated)

45 Left Oxygen (O2) Sensor Circuit (Rich Exhaust Indicated)

51 MEM-CAL Error (Faulty or Incorrect MEM-CAL)

52 Engine Oil Temperature (EOT) Sensor Circuit (Low Temperature Indicated)

53 System Voltage

55 Fuel Lean Monitor

62 Engine Oil Temperature (EOT) Sensor Circuit (High Temperature Indicated)

63 Right Oxygen (O2) Sensor Circuit (Open Circuit)

64 Right Oxygen (O2) Sensor Circuit (Lean Exhaust Indicated)

65 Right Oxygen (O2) Sensor Circuit (Rich Exhaust Indicated)

66 A/C Pressure Sensor Circuit (Open or Shorted)

67 A/C Pressure Sensor Circuit (Pressure Sensor or A/C Clutch Circuit Problem)

68 A/C Relay Circuit (Shorted Circuit)

69 A/C Clutch Circuit

72 Gear Selector Switch Circuit