| 111 | | System checks OK |
| 112 | (O,M) | Intake Air Temperature (IAT) sensor is/was low or grounded - IAT |
| 113 | (O,M) | IAT sensor is/was high or open - IAT |
| 114 | (O,R) | IAT sensor out of range - IAT |
| 116 | (O,R) | Engine Coolant (ECT) sensor out of range - ECT |
| 117 | (O,M) | ECT sensor is/was low or grounded - ECT |
| 118 | (O,M) | ECT sensor is/was high or open - ECT |
| 121 | (O,R,M) | Throttle Position (TP) sensor out of range - TPS |
| 122 | (O,M) | TP low (possibly grounded or open circuit) - TPS |
| 123 | (O,M) | TP is/was high or short to power - TPS |
| 124 | (M) | TP voltage was higher than expected - Fuel control |
| 125 | (M) | TP voltage was lower than expected - Fuel control |
| 126 | (O,R,M) | MAP or BARO sensor out of range - ">MAP |
| 128 | (M) | MAP vacuum has not been changing - check vacuum lines - ">MAP |
| 129 | (R) | No MAP or Mass Air Flow sensor change during "goose" test - MAP MAF |
| 136 | (R) | Oxygen sensor not switching/system lean Left or Front HO2S - Fuel control |
| 137 | (R) | Oxygen sensor not switching/system rich Left or Front HO2S - Fuel control |
| 138 | (R) | Fault in Cold Start Injector circuit - Fuel control |
| 139 | (M) | Oxygen sensor not switching Left or Front HO2S - Fuel control |
| 144 | (M) | Oxygen sensor not switching Single, Right or Rear HO2S - Fuel control |
| 157 | (R,M) | Mass Air Flow signal is/was low or grounded - MAF |
| 158 | (O,R,M) | MAF sensor is/was high or short to power - MAF |
| 159 | (O,R) | MAF sensor is/was out of range - MAF |
| 167 | (R) | No Throttle Position sensor change in "goose" test (must get at least 25% rotation) - TPS |
| 171 | (M) | Oxygen sensor not switching - system was at adaptive limits - Single, Right or Rear HO2S - Fuel control |
| 172 | (R,M) | Oxygen sensor not switching - system is or was lean - Single, Right or Rear HO2S - Fuel control |
| 173 | (R,M) | Oxygen sensor not switching - system is or was rich - Single, Right or Rear HO2S - Fuel control |
| 174 | (M) | Oxygen sensor was slow in switching Single, Right or Rear HO2S - Fuel control |
| 175 | (M) | Oxygen sensor not switching - system was at adaptive limits - Left or Front HO2S - Fuel control |
| 176 | (M) | Oxygen sensor not switching - system is or was lean Left or Front HO2S - Fuel control |
| 177 | (M) | Oxygen sensor not switching - system was rich Left or Front HO2S - Fuel control |
| 178 | (M) | Oxygen sensor was slow in switching Left or Front HO2S - Fuel control |
| 179 | (M) | Fuel system was rich at part throttle Single, Right or Rear HO2S - Fuel control |
| 181 | (M) | Fuel system was lean at part throttle Single, Right or Rear HO2S - Fuel control |
| 182 | (M) | Fuel system was rich at idle Single, Right or Rear HO2S - Fuel control |
| 183 | (M) | Fuel system was lean at idle Single, Right or Rear HO2S - Fuel control |
| 184 | (M) | Mass Air (MAF) output higher than expected - Fuel control |
| 185 | (M) | Mass Air (MAF) output lower than expected - Fuel control |
| 186 | (M) | Injector pulse width longer than expected or Mass Air Flow (MAF) lower than expected - Fuel control |
| 187 | | Injector pulse width shorter than expected or Mass Air Flow (MAF) higher than expected - Fuel control |
| 188 | (M) | Fuel system was rich at part throttle - Left or Front HO2S - Fuel control |
| 189 | (M) | Fuel system was lean at part throttle - Left or Front HO2S - Fuel control |
| 191 | (M) | Fuel system was rich at idle - Left or Front HO2S - Fuel control |
| 192 | (M) | Fuel system was lean at idle - Left or Front HO2S - Fuel control |
| 193 | | Failure in Flexible Fuel (FF) sensor circuit - Fuel control |
| 194 | (M) | Perform cylinder balance test to check for inoperative injectors |
| 195 | (M) | Perform cylinder balance test to check for inoperative injectors |
| 211 | (M) | Ignition PIP signal was erratic or missing - Ignition Systems |
| 212 | (M) | Ignition TACH signal was erratic (module/wiring) or SPOUT circuit fault - Ignition Systems |
| 213 | (R) | Ignition SPOUT or SAW circuit open or shorted - Ignition Systems |
| 214 | (M) | Error in Cylinder ID (CID) circuit or signal - Ignition Systems |
| 215 | (M) | Primary circuit failure - ignition coil 1 - Ignition Systems |
| 216 | (M) | Primary circuit failure - ignition coil 2 - Ignition Systems |
| 217 | (M) | Primary circuit failure - ignition coil 3 - Ignition Systems |
| 218 | (M) | IDM signal open or high or left coil pack failure - Ignition Systems |
| 219 | (M) | SPOUT circuit failure, timing defaulted to 10 degrees - follow code 213 diagnosis |
| 222 | (M) | IDM open or high or right coil pack failure - Ignition Systems |
| 223 | (M) | Dual Plug (DPI), SPOUT or IDM circuit fault - Ignition Systems |
| 224 | (M) | Failure in ignition coil primary circuit - Ignition Systems |
| 225 | (R) | Knock sensor not tested (ignore if not pinging) - KS |
| 226 | (O) | Ignition Diagnostic Monitor (IDM) signal fault - Ignition Systems |
| 232 | (M) | EI primary coil circuit failure - Ignition Systems |
| 238 | (M) | EI primary circuit failure - ignition coil 4 - Ignition Systems |
| 311 | (R) | AIR system not working - Single, Right or Rear HO2S - Air Injection |
| 312 | (R) | AIR not diverting - Air Injection |
| 313 | (R) | AIR not bypassing - Air Injection |
| 314 | (R) | AIR inoperative, Left or Front HO2S - Air Injection |
| 326 | (R,M) | Pressure Feedback EGR shows low pressure EGR not seating or not seating intermittantly - PFE |
| 327 | (O,R,M) | EGR feedback signal is/was low - EVR or PFE |
| 328 | (O,R,M) | EGR Valve Position (EVP) is/was low - EVR |
| 332 | (R,M) | EGR did not open/respond during test or if memory code, did not open intermittantly - EVR or PFE |
| 334 | (O,R,M) | EVP sensor is/was high - EVR |
| 335 | (O) | EGR feedback signal is/was out of range - EVR or PFE |
| 336 | (O,R,M) | PFE sensor signal is/was was high - ">PFE |
| 337 | (O,R,M) | EGR feedback signal is/was was high - EVR |
| 338 | (M) | Cooling system did not heat up (check cooling system / thermostat operation) |
| 339 | (M) | Cooling system overheated (check cooling system / thermostat operation) |
| 341 | (O) | Octane jumper installed (information only code to notify you if it is installed) |
| 411 | (R) | Idle speed system not controlling idle properly (generally idle too high) - ISC |
| 412 | (R) | Idle speed system not controlling idle properly (generally idle too low) - ISC |
| 452 | (M) | Vehicle Speed Sensor (VSS) problem |
| 511 | (O) | No power to PCM pin 1 or bad PCM (processor) |
| 512 | (M) | Memory power (PCM pin 1) was interrupted - Was battery disconnected ? |
| 513 | (O) | Replace processor (PCM) (internal failure) |
| 519 | (O) | PSP switch/circuit open - PSP h Pedal Position (CPP) circuit fault - PNP |
| 528 | (M) | System shows voltage at pin 10 (is A/C on ?) or pin 30 (PNP, CPP switch) - PNP |
| 529 | (M) | Data Communications Link to processor failure Service any EEC codes, erase memory and retest If code is still present refer to instrument cluster diagnosis manual |
| 533 | (M) | Data Communications Link to instrument cluster failure - see 529 |
| 536 | (O,R,M) | Brake On Off open or shorted to ground - BOO |
| 538 | (R) | System did not receive "goose" test - TESTS |
| 539 | (O) | System shows voltage at PCM pin 10 Is A/C on ? |
| 542 | (O,M) | Fuel pump open, bad ground or always on - - Power / Fuel Pump Circuits |
| 543 | (O) | Fuel pump monitor circuit shows no power - Power / Fuel Pump Circuits |
| | (M) | (Service 556 code first if present) Fuel pump relay or battery power feed was open - Power / Fuel Pump Circuits |
| 551 | | Problem in Intake Manifold Runner Control (IMRC) solenoid/circuit - Solenoids |
| 552 | (O) | AIRB solenoid/circuit failure - Solenoids |
| 553 | (O) | AIRD solenoid/circuit failure - Solenoids |
| 554 | (O) | Fuel Press Regulator Control solenoid/circuit fault - Power / Fuel Pump Circuits |
| 556 | (O,M) | Fuel pump relay primary circuit fault - Power / Fuel Pump Circuits |
| 557 | (O,M) | Low speed pump relay primary circuit fault - Power / Fuel Pump Circuits |
| 558 | (O) | EGR vacuum regulator solenoid/circuit failure - EVR or PFE or Solenoids |
| 559 | (O) | A/C relay primary circuit fault - A/C and Fan Circuits |
| 563 | (O) | High Fan Control (HFC) circuit failure - A/C and Fan Circuits |
| 564 | (O) | Fan Control (FC) circuit failure - A/C and Fan Circuits |
| 565 | (O) | Canister Purge 1 solenoid/circuit failure - Solenoids |
| 566 | (O) | transmission 3/4 shift solenoid/circuit - Transmissions |
| 569 | (O) | Canister Purge 2 solenoid/circuit failure - Solenoids |
| 578 | (M) | A/C pressure sensor VREF short to ground - A/C and Fan Circuits |
| 579 | (M) | ACP sensor did not change with A/C on - A/C and Fan Circuits |
| 581 | (M) | Cooling fan current was excessive - A/C and Fan Circuits |
| 582 | (O) | Open cooling fan circuit - A/C and Fan Circuits |
| 583 | (M) | Fuel pump current was excessive - Power / Fuel Pump Circuits |
| 584 | (M) | Open power ground circuit - Power / Fuel Pump Circuits |
| 585 | (M) | A/C clutch current was excessive - A/C and Fan Circuits |
| 586 | (M) | Open circuit in A/C clutch - A/C and Fan Circuits |
| 587 | (O, M) | Communication problem between PCM and Variable Control Relay Module (VCRM) - Power / Fuel Pump Circuits |
| 617 | (M) | Transmission shift failure (1/2 shift) - Transmissions |
| 618 | (M) | Transmission shift failure (2/3 shift) - Transmissions |
| 619 | (M) | Transmission shift failure (3/4 shift) - Transmissions |
| 621 | (O) | Solenoid/circuit failure - shift solenoid 1 - Transmissions |
| 622 | (O) | Solenoid/circuit failure - shift solenoid 2 - Transmissions |
| 624 | (O,M) | Solenoid/circuit failure -Electronic Pressure Control (EPC) current is high - Transmissions |
| 625 | (O,M) | Solenoid/circuit failure - Electronic Pressure Control (EPC) current is low - Transmissions |
| 626 | (O) | Transmission Coast Clutch (CCS) Solenoid/circuit fault - Transmissions |
| 627 | (O) | Torque Converter Clutch circuit fault - Transmissions |
| 628 | (M) | Excessive converter clutch slippage - Transmissions |
| 629 | (O,M) | Torque Converter Clutch circuit fault - Transmissions |
| 631 | (O) | Overdrive Cancel Light circuit problem - Transmissions |
| 632 | (R) | E4OD - Transmission Control Switch (TCS) should be cycled once between engine ID and Goose test |
| 633 | (O) | 4x4L switch should be in 4x2 or 4x4 high for the test |
| 634 | (O,M) | Park/Neutral Position (PNP) or Clutch Pedal Position (CPP) circuit fault Electronic shift transmission - Manual Lever Position (MLP) sensor out of range in Park-Transmissions |
| 636 | (O,R) | Transmission Oil Temperature (TOT) sensor out of range - Transmissions |
| 637 | (O,M) | TOT sensor is/was high or open - Transmissions |
| 638 | (O,M) | TOT sensor is/was low or grounded - Transmissions |
| 639 | (R,M) | Transmission Speed sensor (TSS) circuit fault - Transmissions |
| 641 | (O) | Transmission solenoid/circuit failure Shift Solenoid 3 - Transmissions |
| 643 | (O,M) | Torque Converter Clutch (TCC) circuit - Transmissions |
| 645 | (M) | Transmission 1st gear failure - Transmissions |
| 646 | (M) | Transmission 2nd gear failure - Transmissions |
| 647 | (M) | Transmission 3rd gear failure - Transmissions |
| 648 | (M) | Transmission 4th gear failure - Transmissions |
| 649 | (M) | Transmission EPC system failure - Transmissions |
| 651 | (M) | Transmission EPC solenoid/circuit fault - Transmissions |
| 652 | (O) | Torque Converter Clutch (TCC) circuit fault - Transmissions |
| 654 | (O) | Transmission selector not in PARK - Transmissions |
| 656 | (M) | Torque Converter Clutch (TCC) slip - Transmissions |
| 657 | (M) | Transmission temperature was excessive - Transmissions |