Code 13	Code 21	Code 31	Code 41	Code 51	Code 61	Code 70	Code 80	Code 91
Code 14	Code 22	Code 32	Code 42	Code 52	Code 62	Code 71	Code 81	Code 93
Code 15	Code 23	Code 33	Code 43	Code 53	Code 63	Code 72	Code 82	Code 95
Code 16	Code 24	Code 34	Code 44	Code 54	Code 64	Code 73	Code 83	Code 96
Code 17	Code 25	Code 35	Code 45	Code 55	Code 65	Code 74	Code 84	Code 97
Code 18	Code 26	Code 36	Code 46	Code 56	Code 66	Code 75	Code 85	Code 99
Code 19	Code 27	Code 37	Code 47	Code 57	Code 67	Code 76	Code 86
	Code 28	Code 38	Code 48	Code 58	Code 68	Code 77	Code 87
	Code 29	Code 39	Code 49	Code 59	Code 69	Code 78	Code 88
						Code 79

Code 13
Oxygen (O2) Sensor-signal stays low (lean) during warm engine cruise

Code 21
Throttle Position Sensor (TPS)

Code 31
Manifold Absolute Pressure (MAP) sensor
Or:
Fuel Injector
Or
Park/Neutral switch-circuit problems
Or
CAM sensor
Or
Engine speed control governor malfunction

Code 41
Cam Sensor failure
Or:
Tach input error-no reference pulses during engine run
Or
Electronic Spark Timing (EST) circuit-open or shorted to ground during engine run
Or
Direct Ignition System (DIS) fault-bypass circuit open or shorted to ground during engine run

Code 51
Electronic Control Module (ECM) computer circuit problems-
faulty programmable read only memory (PROM), MEMCAL, ECM or checksum errors

Code 61
O2 sensor degraded
Or:
Port throttle system error
Or
Cruise control problems-vent solenoid circuit
Or
Air Conditioner system performance problems

Code 70
Air Conditioner pressure sensor

Code 80
Vehicle Speed Sensor (VSS)-signal voltage is low

Code 91
Skip shift light--open or short circuit problems in skip shift light circuit.

Code 14
Coolant Temperature Sensor (CTS)-signal voltage is low

Code 22
Throttle Position Sensor (TPS)-signal voltage is low during engine idle
Or
Fuel cutoff relay circuit-open or shorted to ground.

Code 32
Barometric pressure sensor.
Or
EGR valve diagnostic switch-
closed during engine startup
or open when EGR flow requested by ECM

Code 42
EST circuit-open or shorted to ground during engine run
Or
DIS fault-bypass circuit open or shorted to ground during engine run
Or
Fuel cutoff relay circuit-open or shorted to ground

Code 52
ECM computer circuit problems-
faulty or missing CALPAC or MEMCAL, analog to digital converter error or quad driver module fault.
Or
System voltage high for a long period of time.
(Electronic transmission note: this fault may cause other codes to be set)

Code 62
Gear switch circuit problems
Or
Cruise control problems-vacuum solenoid circuit

Code 71
A/C evaporator temperature sensor-signal voltage too low

Code 81
Brake switch circuit problems
Or
ABS message fault
Or
Transmission solenoid "B"-open or short circuit problems

Code 93
Pressure control solenoid-
transmission line pressure not at desired level

Code 15
Coolant Temperature Sensor (CTS)
-signal voltage is low

Code 23
Manifold Air Temperature (MAT) sensor-
signal voltage is low or high
Or
TPS error
Or
Mixture control solenoid-open or short circuit problems

Code 33
Mass air flow (MAF) sensor -Quad 4 engine only-
signal voltage or frequency is high during engine idle
Or
MAP sensor=signal voltage is high during engine idle.
(Note: Engine misfire or unstable idle may cause this code)

Code 43
EST circuit-low voltage detected
Or
Electronic Spark Control (ESC)-circuit problems

Code 53
Over voltage condition
(electronic transmission note: this fault may cause other codes to be set)
Or
EGR system problems or EGR solenoid #1 problem
Or
Voltage reference error
Or
Vehicle anti theft system problems

Code 63
MAP sensor-signal voltage is high
Or
Small EGR failure
Or
Cruise control system problem

Code 72
Gear select switch-circuit problems
Or
VSS-loss of signal

Code 82
Ignition system fault -3X signal problem.
Or
Transmission solenoid "A"-open or short circuit problems.

Code 95
Change oil light-
wrong voltage is present in light circuit for more than 26 seconds

Code 16
Battery or alternator problem-voltage too high or low
Or
DIS fault-line open or shorted to ground
Or
Transmission speed error

Code 24
VSS-open or short circuit problems

Code 34
Mass air flow (MAF) sensor -Quad 4 engine only-
signal voltage or frequency is low during engine cruise
Or
MAP sensor=signal voltage is low during ignition on.

Code 44
Lean exhaust indication-
O2 sensor voltage stays low after one or two minutes of engine run

Code 54
Low fuel pump voltage
Or
Fuel pump relay
Or
EGR solenoid #2 failure
Or
Quad driver module output failure
Or
Mix control solenoid-circuit voltage is too high

Code 64
MAP sensor-signal voltage is highVMedium EGR failure

Code 73
A/C evaporator temperature sensor-signal voltage too high
Or
Transmission pressure control solenoid-circuit problems

Code 83
Torque Converter Clutch (TCC) switch/solenoid-circuit problems
Or
Reverse inhibit-open or short circuit in reverse inhibit solenoid coil

Code 96
Transmission voltage low-
low system voltage possibly caused by generator
voltage supply circuit or power train control module (PCM)

Code 17
RPM signal problem
Or
Camshaft sensor-circuit problems

Code 25
MAT sensor-signal voltage is low
Or
Vacuum switching valve circuit-open or shorted to ground
Or
ATS sensor-signal voltage is high

Code 35
Idle Air Control (IAC) system problem-can not set desired rpm

Code 45
Rich exhaust indication-
O2 sensor voltage stays high after one minute of engine run.

Code 55
ECM-
ECM failure, serial bus error, SAD error, or fuel lean malfunction
Or
EGR solenoid #3 failure

Code 74
Traction control circuit voltage low

Code 84
3-2 Control solenoid-open or short circuit problems

Code 97
VSS-output circuit problems

Code 18
Camshaft or Crankshaft sensor-circuit problems
Or
Fuel Injector circuit is not working properly-possible blown injector fuse

Code 26
Quad driver module or quad driver #1 error

Code 36
MAF sensor -Quad 4 engine only- burn off circuit problem
Or
transmission shift problem
Or
DIS fault-loss of 24X signal or extra or missing pulses in EST signal
Or
Ignition system fault-loss of high resolution pulse signal

Code 46
Vehicle anti-theft system failure
Or
Power steering pressure switch failure

Code 56
Corrosivity/add coolant
Or
Port throttle system vacuum sensor problems

Code 66
A/C pressure sensor-circuit problems or low A/C charge
Or
ECM computer circuit problem-internal reset occured

Code 75
EGR system-solenoid #1 problem
Or
System voltage low-charging system problems
Or
Transmission voltage low-low system voltage possibly caused by the generator voltage supply circuit or power train control module

Code 85
ECM computer circuit problems-
faulty programmable read only memory (PROM)
Or
Transmission input or output speed sensor-circuit problems.
(Speed sensor signals do not agree with selected gear range)
Or
TCC-TCC is mechanically stuck on

Code 99
Tachometer output circuit problems

Code 19
Ignition system fault-intermittent 7X signal or loss of 58X signal

Code 27
2nd Gear Switch
Or
Quad Driver module or quad driver #2 error

Code 37
Brake switch stuck on

Code 47
ECM computer circuit problems-
universal asynchronous receiver/transmitter (UART) link or data loss
Or
Knock sensor module located in the computer is not working properly.

Code 57
Boost control problem

Code 67
Cruise control-switch circuit problems
Or
A/C pressure sensor-circuit problems
Or
TCC solenoid-circuit problems
Or
Cruise control switches-circuit problems

Code 76
EGR system-solenoid #2 problem

Code 86
ECM computer circuit problems-
faulty analog to digital converter
Or
Transmission low gear error-
transmission in 3rd or 4th gear when computer commanding 1st or 2nd gear

Code 28
3rd gear switch
Or
Transmission fluid pressure switch assembly
-open or short circuit problems

Code 38
Brake switch circuit fault
Or
Knock sensor-open circuit problem

Code 48
Misfire symptom
Or
MAF sensor -Quad 4 only-
open or short circuit MAF sensor signal

Code 58
Vehicle anti theft sytem problem
Or
Transmission Temperature Sensor (TTS)-
short circuit problem in sensor or wiring
Or
Transmission fluid temperature high

Code 68
Cruise Control-system circuit problems
Or
A/C clutch relay-short circuit
Or
Transmission overdrive ratio error
-engine RPM greater than input speed.

Code 77
EGR system-Solenoid #3 problem
Or
Primary cooling fan relay driver circuit-circuit problems

Code 87
ECM computer circuit problems- Faulty EEPROM
Or
Transmission high gear error-
transmission in 1st or 2nd gear when computer commanding 3rd or 4th gear.

Code 29
4th gear switch

Code 39
TCC circuit fault
Or
Clutch switch circuit problems
Or
Knock sensor short circuit problem

Code 49

Code 59
Transmission Temperature Sensor-
open circuit problem in sensor or wiring.
Or
Transmission fluid temperature high

Code 69
A/C system-
pressure switch or A/C clutch relay circuit problems
Or
TCC stuck on

Code 78
Secondary cooling fan relay driver circuit-circuit problems

Code 88
ECM computer circuit problem-internal reset occurred

Code 79
VSS signal voltage too high
Or
Transmission Temperature Sensor-high temperature indicated