2 and 3 Digit Codes

NOTE: For corresponding tests see Diagnostic Charts/Trouble Code Charts/TC-1A TC-1A CODE TO TC TEST CHART (Checking For Trouble Codes)

NOTE: Fault code indicates PCM has detected condition outside of set limits. Fault code does not identify failed component.

FAULT CODE NO. SCAN TOOL DISPLAY DESCRIPTION OF FAULT CONDITION

11 No reference signal No camshaft reference
during cranking signal detected during engine cranking.

13+** No change in MAP No variation in MAP
from start to run sensor is detected

No difference recognized between engine MAP reading and barometric pressure reading at start-up.

14+** MAP voltage too low MAP sensor input below minimum acceptable voltage.
or
MAP voltage too high MAP sensor input above maximum acceptable voltage.

15** No vehicle speed signal No vehicle distance (speed) sensor signal detected during road load conditions.

16 Knock sensor circuit Open or shorted condition detected in knock sensor circuit.

17 Engine is cold too long Engine coolant temperature remains below normal operating temperatures during vehicle travel (thermostat).

21** O2 signal stays at center Neither rich nor lean condition is detected from the oxygen sensor input.
or
02 sensor shorted high Oxygen sensor input voltage maintained above normal operating range.

22+** ECT sensor voltage low Sensor input below the minimum acceptable voltage
or
ECT sensor voltage high Sensor input above the maximum acceptable voltage.

23 Charge air temp. sensor Sensor input above the
voltage high maximum acceptable voltage
or
Charge air temp. sensor Sensor input below the
voltage low minimum acceptable voltage.

24+** TPS voltage low Sensor input below the minimum acceptable voltage
or
TPS voltage high Sensor input above the maximum acceptable voltage.

25** IAC motor circuits An open or shorted condition detected in one or more of the IAC control circuits.

27+** Injector control circuit Injector output driver does not respond properly to the control signal.

31** Purge solenoid circuit An open or shorted condition detected in the purge solenoid circuit.

32** EGR solenoid An open or shorted condition detected in the EGR solenoid
or
EGR system failure Failure detected in EGR control system.

33 A/C clutch relay circuit An open or shorted condition detected in the A/C clutch relay circuit.
or
A/C sensor input high A/C pressure transducer input above maximum acceptable voltage.
or
A/C sensor input low A/C pressure transducer input below minimum acceptable voltage.

34 S/C solenoid circuits An open or shorted condition detected in the speed control vacuum or vent solenoid circuits.
or
MUX speed control switch high Speed control switch input above maximum acceptable voltage.
or
MUX speed control switch low Speed control switch input below minimum acceptable voltage.

35 Low speed fan relay An open or shorted condition detected in the radiator low speed fan relay.
or
High speed fan relay An open or shorted condition detected in the radiator high speed fan relay.

41+** Alternator field circuit An open or shorted condition detected in the alternator field control circuit.

42 ASD relay control circuit An open or shorted condition detected in the auto shut down relay circuit.

43+** Ignition coil #1 Peak primary circuit
primary circuit current not achieved with maximum dwell time.
or
Ignition coil #2 Peak primary circuit
primary circuit current not achieved with maximum dwell time.
or
Ignition coil #3 Peak primary circuit
primary circuit current not achieved with maximum dwell time.

44 Battery temp voltage An open or shorted condition exists in the ECT circuit or a problem exists in the PCM's battery temperature voltage circuit.

46+** Charging voltage high Battery voltage sense input above target charging voltage during engine operation.

47 Charging voltage low Battery voltage sense input below target charging voltage during engine operation.

51** Lean O2 signal Oxygen sensor signal indicates lean fuel/air ratio condition during engine operation.

52** Rich O2 condition Oxygen sensor signal indicates rich fuel/air ratio condition during engine operation.

53 PCM failure Internal PCM fault condition detected.
or
SPI communications Internal PCM fault condition detected.

54 No sync pick-up signal No fuel sync signal detected during crankshaft rotation.


62 PCM failure PCM failure
SRI miles not stored SRI miles not stored

63 PCM failure PCM failure
EEPROM write denied EEPROM write denied

65 Manifold tuning valve An open or shorted condition detected in the manifold tuning valve solenoid circuit.

66 No CCD messages PCM did not receive messages from the CCD bus.
or
No body CCD messages PCM did not receive CCD bus messages from the body control module.
or
No EATX CCD messages PCM did not receive CCD bus messages from the transmission control module.

77 Speed control relay An open or shorted condition detected in the speed control relay circuit.

55 N/A Completion of fault code display on check engine lamp.

+ Check Engine Lamp On
** Check Engine Lamp On (California Only)