| Codes |
Test |
Meaning |
| 12 |
R |
RPM at idle out of range / high |
| 13 |
O,R,C |
RPM at idle out of range / low |
|
| 14 |
O,C |
Ignition profile pickup (PIP) failure |
|
| 15 |
O |
PCM Read Only Memory (ROM) test failed |
|
| 15 |
C |
Power interruption to
computer memory or PCM Keep Alive Memory (KAM) test failed |
|
| 16 |
R |
RPM too low during engine
run self tests or oxygen sensor out or range or throttle not closing |
|
| 17 |
R |
Curb idle speed out of range |
|
| 18 |
R,C |
SPOUT circuit open or IDM circuit failure (SPOUT circuit
grounded |
|
| 18 |
C |
IDM circuit failure / SPOUT circuit grounded |
|
| 19 |
O |
No power to EEC processor or failure in PCM internal voltage |
|
| 19 |
R |
Erratic RPM signal at idle |
|
| 19 |
C |
CID sensor failure |
| 21 |
O,R,C |
Cooling temperature sensor out of specified range or ECT out
of range |
|
| 22 |
O,R,C |
Manifold Absolute Pressure (MAP) or BARO sensor out of range |
| 23 |
O,R,C |
Throttle Position (TP) sensor signal out of range |
| 24 |
O,R |
Intake Air Charge Temperature sensor or vane air temperature
sensor or EDIS fault |
| 25 |
R |
Knock not sensed during Dynamic Response Test |
| 26 |
O,R |
Mass air flow sensor or vane air flow sensor or transmission
temperature sensor fault |
| 27 |
C |
Vehicle speed sensor or EDIS fault |
|
| 28 |
O,R |
Vane air temperature sensor; EDIS or DIS fault |
|
| 29 |
C |
Insufficient input from Vehicle Speed Sensor |
|
| 31 |
O,R,C |
Canister or EGR valve control system or EVP circuit below
minimum voltage |
|
| 32 |
O,R,C |
Canister or EGR valve control system signal out of spec or EVP
voltage low |
|
| 33 |
R,C |
Canister or EGR control system not operating properly |
|
| 34 |
O,R,C |
Canister or EGR valve control circuit or EVP voltage high |
|
| 35 |
O,R,C |
EGR signal voltage too
high or RPM below spec during engine run test or EVP voltage high |
| 38 |
C |
Idle control circuit open |
| 39 |
C |
Automatic overdrive circuit failure (transmission failure) |
| 41 |
R |
Injectors out of balance on 5.0L SEFI; EGO sensor voltage low
(except 5.0L SEFI) |
| 41 |
C |
EGO sensor signal out of
range (except 5.0L SEFI); fuel pressure out of range - 5.0L SEFI |
| 42 |
R |
Fuel pressure out of range on 5.0L SEFI |
| 42 |
R,C |
EGO sensor rich (except 5.0L SEFI) |
| 43 |
C |
Lean EGO at wide open throttle |
| 43 |
R |
EGO sensor not hot enough for engine run self-test |
| 44 |
R |
Thermactor air system fault |
| 45 |
R,C |
Thermactor air upstream or EDIS or DIS system failure |
| 46 |
R,C |
Thermactor air is not bypassed or EDIS or DIS system failure |
| 47 |
R |
EGO sensor signal out of range or vane air flow too low |
| 48 |
R |
Air flow high at idle |
| 48 |
C |
Distributorless Ignition System (DIS) coil pack circuit
failure |
| 49 |
C |
SPOUT, EDIS, or SAW signal problem |
| 51 |
O,C |
Coolant temperature sensor out of range indicated -40?C /
circuit is open |
| 52 |
R |
Power Steering Pressure Switch (PSPS) circuit out of range |
| 53 |
O,C |
Throttle Position (TP) sensor above maximum voltage |
| 54 |
O,C |
Intake Air charge
temperature sensor indicates -40?C / circuit open; vane air flow sensor out
of range |
| 55 |
R |
Open connection in ignition key circuit, 83-88 3.8L TBI |
| 55 |
R |
Charging system out of range for 83-88 (ex. 3.8L TBI) |
| 56 |
O,R,C |
Mass or vane air flow sensor above maximum voltage
transmission sensor failure |
| 57 |
C |
Neutral Position Switch (NPS) circuit fault, 89-90 All |
| 58 |
O |
CFI / Idle air control circuit failure, EFI vane air control
circuit fault |
| 58 |
C |
Vane air temperature sensor out of range |
| 58 |
R |
Idle air control circuit failure |
| 59 |
O,C |
Transmission throttle pressure switch failure (except 3.8L
SHO) |
| 59 |
O,C |
3.0L SHO and 3.3L supercharged; low speed fuel pump circuit
fault |
| 61 |
O,C |
Engine coolant temperature sensor indicated 254?F / circuit
grounded |
| 62 |
O |
Transmission clutch fault |
| 63 |
O,C |
Throttle Position (TP) circuit fault, below minimum voltage |
| 64 |
O,C |
Vane air temperature
sensor fault or intake air temperature indicated 254?F / circuit grounded |
| 65 |
O,R,C |
Overdrive Cancel Switch
not changing state (E40D), Charging or fuel system fault; transmission fault |
|
| 66 |
O,C |
Mass air flow sensor fault, below minimum voltage |
| 67 |
O,R,C |
Neutral Drive Switch fault, switch circuit open / Air
conditioner on during self-test |
| 67 |
C |
Air conditioner clutch switch fault |
| 68 |
O,R,C |
Idle Tracking Switch; vane air temp sensor or transmission
temperature switch |
| 69 |
O,C |
Vehicle speed sensor or transaxle fault |
| 71 |
C |
Idle Tracking Switch fault or electrical interference |
| 72 |
C |
System power circuit fault or electrical interference |
| 72 |
R |
Manifold Absolute Pressure (MAP) sensor out or range |
| 73 |
R |
Throttle Position (TP) sensor fault |
| 74 |
R |
Brake On/Off (BOO) switch fault |
| 75 |
R |
Brake On/Off (BOO) switch fault |
| 76 |
R |
Vane air flow sensor fault |
| 77 |
R |
Operator error during Dynamic Response Test |
| 78 |
C |
Power interrupt |
| 79 |
O |
Air Conditioner "ON" during self-test / defrost on |
| 81 |
O |
Air diverter solenoid fault, intake air control circuit fault
/ air injection diverter |
| 82 |
O |
Air diverter solenoid circuit fault or supercharger bypass
circuit fault |
| 83 |
O |
EGR control circuit fault (3L CFI, 2.3L EFI, ex. turbo) |
| 83 |
O,C |
Low speed fuel pump relay circuit fault, all 1980-88, 1989-90
SHO |
| 83 |
O,C |
EGR solenoid circuit fault 1989-90 SHO |
| 83 |
O |
Cooling fan circuit fault 2.3L turbo, 2.5L, 3.8L, 3.8L EFI
only |
| 84 |
O,R |
EGR control circuit failure |
| 85 |
O,R |
Canister Purge Solenoid or transaxle shift control circuit
failure 2.3L turbo failure |
| 86 |
C |
Low fuel pressure or transaxle problem |
| 87 |
O,R,C |
Fuel pump primary circuit fault |
| 88 |
O |
Clutch converter circuit fault 2.3L turbo, DIS fault |
| 89 |
O |
Converter Clutch Control (CCC) solenoid circuit failure; lock
up solenoid fault |
| 91 |
R,C |
EGO sensor problem due to fuel pressure or injectors out of
balance |
| 92 |
R,C |
EGO sensor problem due to
fuel pressure or injectors out of balance / transaxle shift fault |
| 93 |
O,R |
Throttle position sensor
fault during self-test; EGO sensor fault; transaxle clutch solenoid fault |
| 94 |
R |
Thermactor air system
fault; transaxle switch solenoid fault; secondary air injection system
inoperative (left side) |
| 95 |
O,C |
Fuel pump secondary circuit fault |
| 96 |
R |
Air diverter circuit fault |
| 96 |
O,C |
Fuel pump secondary circuit fault |
| 97 |
R |
Air diverter circuit fault |
| 98 |
R |
Exhaust gas oxygen sensor fault or overdrive cancel indicator
light circuit fault |
| 99 |
R |
Computer detected hard
fault / EGO sensor fault / electronic pressure control solenoid circuit fault |
|
| 111 |
O,C,R |
System PASS |
| 112 |
O,C |
Electronic pressure
control circuit failure or system has not learned to control idle speed |
| 113 |
O,C |
Intake air charge temperature sensor above maximum voltage /
-40?C indicated |
| 114 |
O,R |
Air charge temperature sensor higher or lower than expected
voltage |
| 116 |
O,R |
Engine
coolant temperature higher or lower than expected |
| 117 |
O,C |
Engine
coolant temperature sensor below minimum voltage / 254?F indicated |
| 118 |
O,C |
Engine
coolant temperature sensor above maximum voltage / 0-40?C indicated |
| 121 |
O,R,C |
Throttle
Position sensor above or below normal or position voltage inconsistent with
MAF sensor |
|
| 122 |
O,C |
Throttle Position sensor below minimum voltage |
| 123 |
O,C |
Throttle Position sensor above maximum voltage |
| 124 |
C |
Throttle Position sensor above normal |
| 125 |
C |
Throttle Position sensor below normal |
| 126 |
O,R,C |
Manifold
absolute pressure (MAP) or barometer sensor (BARO) above or below normal |
| 128 |
C |
Manifold
absolute pressure sensor / vacuum hose disconnected / damaged |
| 129 |
R |
Insufficient
manifold absolute pressure sensor (MAP) or mass air flow (MAF) change during
dynamic response test |
| 136 |
R |
Heated
exhaust gas oxygen sensor fault during KOER indicated lean bank #2 |
| 137 |
R |
Heated
exhaust gas oxygen sensor fault indicates rich bank #2 |
| 138 |
O,R,C |
Cold
start injectors flow insufficient KOER test |
| 139 |
C |
Heated
exhaust gas oxygen sensor switch fault bank #2 |
| 144 |
C |
Heated
exhaust gas oxygen sensor switch fault bank #1 |
| 157 |
C |
Manifold
Air Flow sensor fault, low voltage |
| 158 |
O,C |
Manifold
Air Flow sensor fault, high voltage |
| 159 |
O,R |
Manifold
Air Flow sensor fault, above or below normal |
| 167 |
R |
Throttle
Position sensor fault during dynamic response test |
| 171 |
C |
Heated oxygen sensor fault/not switching bank #1 or fuel
system at adaptive limits |
| 172 |
R,C |
Heated oxygen sensor fault/lean bank #1 |
| 173 |
R,C |
Heated exhaust gas oxygen sensor fault/rich bank #1 |
| 175 |
C |
Heated exhaust gas oxygen
sensor fault/not switching bank #2 or fuel system at adaptive limits |
| 176 |
O |
PCM Read Only Memory (ROM) test failed |
| 177 |
C |
Heated exhaust gas oxygen sensor fault/lean bank #2 |
| 179 |
C |
Heated exhaust gas oxygen
sensor fault unable to switch/rich during part throttle bank #1 |
| 181 |
C |
Heated exhaust gas oxygen
sensor fault unable to switch/lean during part throttle bank #1 |
| 182 |
C |
Fuel mixture rich bank #1 |
| 183 |
C |
Fuel mixture lean bank #1 |
| 184 |
C |
Manifold air flow sensor above normal |
| 185 |
C |
Manifold air flow sensor below normal |
| 186 |
C |
Fault in injector pulse width circuit or mass air flow circuit |
| 187 |
C |
Fault in injector pulse width circuit or mass air flow circuit |
| 188 |
C |
Heated exhaust gas oxygen
sensor fault unable to switch/rich during part throttle bank #2 |
| 189 |
C |
Heated exhaust gas oxygen
sensor fault unable to switch/lean during part throttle bank #2 |
| 191 |
C |
Fuel mixture rich bank #2 |
| 192 |
C |
Fuel mixture lean bank #2 |
| 193 |
O |
Flexible fuel sensor circuit fault |
| 211 |
C |
Profile Ignition Pickup (PIP) circuit fault |
| 212 |
C |
Loss of ignition diagnostic monitor signal/SPOUT circuit
grounded |
| 213 |
R |
Spark output circuit/SPOUT circuit open |
| 214 |
C |
Cylinder identification circuit failure |
| 215 |
C |
DIS fault ignition system - coil #1 |
| 216 |
C |
DIS fault ignition system - coil #2 |
| 217 |
C |
DIS fault ignition system - coil #3 |
| 218 |
C |
Loss of Ignition Diagnostic Monitor (IDM)/left side |
| 219 |
C |
Spark output signal/no advance timing/defaulted to 10? SPOUT
circuit open |
| 221 |
C |
Distributorless ignition system/spark timing fault |
| 222 |
C |
Distributorless ignition
system - loss of right side Ignition Diagnostic Monitor (IDM) signal |
| 223 |
C |
Distributorless ignition system - loss of dual plug inhibit
(DPI) control |
| 224 |
C |
Loss of IDM input to processor/spout circuit ground/coil 1,2,3
or 4 |
| 225 |
R |
Knock sensor fault during engine run self-test |
| 226 |
C |
Electronic
Distributorless Ignition System (EDIS) problem, Ignition Diagnostic Monitor
(IDM) signal |
|
| 227 |
C |
Electronic
Distributorless Ignition System (EDIS) problem, Crankshaft Position Sensor
(CPS) problem |
|
| 232 |
C |
Electronic Distributorless Ignition System (EDIS) Coil 1,2,3
or 4 circuit fault |
| 233 |
C |
Electronic
Distributorless Ignition System (EDIS); Spark Advance Word (SAW) signal error |
| 238 |
C |
Distributorless Ignition System (DIS) coil #4 circuit fault |
| 239 |
C |
Electronic
Distributorless Ignition System (EDIS) Crankshaft Position Sensor (CPS)
signal fault |
| 241 |
C |
Ignition Diagnostic Monitor (IDM) signal pulse width
transmission error |
| 242 |
C |
DIS system operating in failure mode |
| 243 |
C |
Electronic Distributorless Ignition System secondary circuit
fault in coil 1,2,3 or 4 |
| 311 |
R |
Thermactor air system/fault during engine run self-test |
| 312 |
R |
Thermactor air system/fault during engine run self-test |
| 313 |
R |
Thermactor air system/air not bypassed during engine run
self-test |
| 314 |
R |
Thermactor air system/fault during engine run self-test |
| 326 |
R,C |
EGR sensor circuit voltage lower than expected |
| 327 |
O,R,C |
EGR valve position circuit below minimum voltage |
| 328 |
O,R,C |
Valve position sensor fault/EGR closed valve voltage lower
than expected |
| 332 |
R,C |
Insufficient EGR flow detected |
| 334 |
- |
EGR closed valve voltage high |
| 335 |
O |
EGR sensor circuit voltage higher or lower than expected
during KOEO |
| 336 |
R,C |
EGR sensor circuit voltage higher than expected / exhaust
pressure high |
| 337 |
O,R,C |
EGR sensor circuit above maximum voltage |
| 411 |
R |
Cannot control RPM during KOER low RPM check |
| 412 |
R |
Cannot control RPM during KOER high RPM check |
| 452 |
R |
Vehicle Speed Sensor (VSS) signal fault |
| 511 |
O |
Read Only Memory (ROM) test failure |
| 512 |
C |
Keep Alive Memory (KAM) test failure |
| 513 |
C |
PCM internal voltage failure |
| 519 |
O |
Power Steering Pressure Switch circuit open |
| 521 |
R |
Power Steering Pressure Switch circuit fault |
| 522 |
O |
Vehicle not in Park or Neutral during KOEO |
| 525 |
O |
Vehicle was in gear |
| 528 |
C |
Clutch switch circuit fault |
| 529 |
C |
Data communications link circuit fault |
| 533 |
C |
Electronic instrument cluster circuit or data communications
link circuit failure |
| 536 |
R,C |
Brake On/Off (BOO) circuit not activated during KOER |
| 538 |
R |
Insufficient RPM change
during KOER Dynamic Response Test/Invalid cylinder balance test due to throttle movement during test |
| 539 |
O |
AC on/Defrost on during KOEO |
| 542 |
O,C |
Fuel pump secondary circuit fault |
| 543 |
O,C |
Fuel pump secondary circuit fault |
| 551 |
R |
Idle Air Control (IAC) solenoid circuit fault |
| 552 |
O |
Thermactor air bypass solenoid circuit fault |
| 553 |
O |
Thermactor air diverter solenoid circuit fault |
| 555 |
R |
SBS circuit fault |
| 556 |
O,C |
Fuel pump relay primary circuit fault |
| 558 |
O |
EGR valve regulator solenoid circuit fault |
| 563 |
O |
High Speed Electro Drive Fan circuit fault |
| 564 |
O |
Electro Drive Fan circuit fault |
| 565 |
O |
Canister purge solenoid circuit fault |
| 569 |
O |
Auxiliary canister purge circuit fault |
| 617 |
C |
Transmission problem (1-2 shift error) |
| 618 |
C |
Transmission problem (2-3 shift error) |
| 619 |
C |
Transmission problem (3-4 shift error) |
| 621 |
O |
Shift Solenoid #1 circuit fault |
| 622 |
O |
Shift Solenoid #2 circuit fault |
| 624 |
O,C |
Electronic Pressure Control solenoid circuit fault |
| 625 |
O |
Electronic Pressure Control solenoid circuit fault |
| 626 |
O |
Coast Clutch solenoid circuit fault |
| 627 |
O,C |
Converter Clutch Control solenoid circuit fault |
| 628 |
C |
Excessive converter clutch slippage |
| 629 |
O |
Converter clutch solenoid circuit fault |
| 631 |
O |
Overdrive transmission cancel indicator light fault |
| 632 |
R |
Overdrive transmission cancel switch/no action during self
engine run test |
| 633 |
O |
4x4 switch is closed during KOEO self-test |
| 634 |
C |
Manual lever position voltage out of range |
| 636 |
O,R |
Transmission oil temperature out of range |
| 637 |
O,C |
Transmission oil temperature voltage above max. |
| 638 |
O,C |
Transmission oil temperature voltage below min. |
| 639 |
R,C |
Turbine speed sensor out of range/insufficient input from
transmission speed sensor |
| 641 |
O |
Shift Solenoid #3 circuit fault |
| 645 |
C |
Transmission - incorrect gear ratio - first gear |
| 646 |
C |
Transmission - incorrect gear ratio - second gear |
| 647 |
C |
Transmission - incorrect gear ratio - third gear |
| 648 |
C |
Transmission - incorrect gear ratio - fourth gear |
| 649 |
C |
Electronic Pressure Control Circuit solenoid higher or lower
than expected |
| 651 |
C |
Electronic Pressure Control Ciruit solenoid failure |
| 652 |
O |
Modulated Lock-up Torque Converter clutch solenoid circuit
fault |
| 654 |
O |
Not in Park during KOEO self-test |
| 998 |
R |
Operating in failure mode |
