| Code | What it means |
| P0251 | "Injection Pump Fuel Metering Control ""A"" Malfunction (Cam/Rotor/Injector)" |
| P0252 | "Injection Pump Fuel Metering Control ""A"" Range/Performance (Cam/Rotor/Injector)" |
| P0253 | "Injection Pump Fuel Metering Control ""A"" Low (Cam/Rotor/Injector)" |
| P0254 | "Injection Pump Fuel Metering Control ""A"" High (Cam/Rotor/Injector)" |
| P0255 | "Injection Pump Fuel Metering Control ""A"" Intermittent (Cam/Rotor/Injector)" |
| P0256 | "Injection Pump Fuel Metering Control ""B"" Malfunction (Cam/Rotor/Injector)" |
| P0257 | "Injection Pump Fuel Metering Control ""B"" Range/Performance (Cam/Rotor/Injector)" |
| P0258 | "Injection Pump Fuel Metering Control ""B"" Low (Cam/Rotor/Injector)" |
| P0259 | "Injection Pump Fuel Metering Control ""B"" High (Cam/Rotor/Injector)" |
| P0260 | "Injection Pump Fuel Metering Control ""B"" Intermittent (Cam/Rotor/Injector)" |
| P0261 | Cylinder 1 Injector Circuit Low |
| P0262 | Cylinder 1 Injector Circuit High |
| P0263 | Cylinder 1 Contribution/Balance Fault |
| P0264 | Cylinder 2 Injector Circuit Low |
| P0265 | Cylinder 2 Injector Circuit High |
| P0266 | Cylinder 2 Contribution/Balance Fault |
| P0267 | Cylinder 3 Injector Circuit Low |
| P0268 | Cylinder 3 Injector Circuit High |
| P0269 | Cylinder 3 Contribution/Balance Fault |
| P0270 | Cylinder 4 Injector Circuit Low |
| P0271 | Cylinder 4 Injector Circuit High |
| P0272 | Cylinder 4 Contribution/Balance Fault |
| P0273 | Cylinder 5 Injector Circuit Low |
| P0274 | Cylinder 5 Injector Circuit High |
| P0275 | Cylinder 5 Contribution/Balance Fault |
| P0276 | Cylinder 6 Injector Circuit Low |
| P0277 | Cylinder 6 Injector Circuit High |
| P0278 | Cylinder 6 Contribution/Balance Fault |
| P0279 | Cylinder 7 Injector Circuit Low |
| P0280 | Cylinder 7 Injector Circuit High |
| P0281 | Cylinder 7 Contribution/Balance Fault |
| P0282 | Cylinder 8 Injector Circuit Low |
| P0283 | Cylinder 8 Injector Circuit High |
| P0284 | Cylinder 8 Contribution/Balance Fault |
| P0285 | Cylinder 9 Injector Circuit Low |
| P0286 | Cylinder 9 Injector Circuit High |
| P0287 | Cylinder 9 Contribution/Balance Fault |
| P0288 | Cylinder 10 Injector Circuit Low |
| P0289 | Cylinder 10 Injector Circuit High |
| P0290 | Cylinder 10 Contribution/Balance Fault |
| P0291 | Cylinder 11 Injector Circuit Low |
| P0292 | Cylinder 11 Injector Circuit High |
| P0293 | Cylinder 11 Contribution/Balance Fault |
| P0294 | Cylinder 12 Injector Circuit Low |
| P0295 | Cylinder 12 Injector Circuit High |
| P0296 | Cylinder 12 Contribution/Range Fault |
| P0300 | Engine Misfire Detected |
| P0301 | Cylinder 1 Misfire Detected |
| P0302 | Cylinder 2 Misfire Detected |
| P0303 | Cylinder 3 Misfire Detected |
| P0304 | Cylinder 4 Misfire Detected |
| P0305 | Cylinder 5 Misfire Detected |
| P0306 | Cylinder 6 Misfire Detected |
| P0307 | Cylinder 7 Misfire Detected |
| P0308 | Cylinder 8 Misfire Detected |
| P0309 | Cylinder 9 Misfire Detected |
| P0311 | Cylinder 11 Misfire Detected |
| P0312 | Cylinder 12 Misfire Detected |
| P0313 | Misfire Detected With Low Fuel Level |
| P0318 | Rough Road Sensor Circuit |
| P0320 | Ignition/Distributor Engine Speed Input Circuit Malfunction |
| P0321 | Ignition/Distributor Engine Speed Input Circuit Range/Performance |
| P0322 | IC Module 4X Reference CKT No Frequency |
| P0323 | Ignition/Distributor Engine Speed Input Circuit Intermittent |
| P0324 | Knock Sensor (KS) Module Performance |
| P0325 | PCM Knock Sensor Circuit |
| P0326 | Knock Sensor CKT Excessive Spark Retard |
| P0327 | Knock Sensor Circuit Low Voltage |
| P0328 | Knock Sensor 1 Circuit High Input (Bank 1 or SingleSensor) |
| P0329 | Knock Sensor 1 Circuit Intermittent (Bank 1 or Single Sensor) |
| P0330 | Knock Sensor (KS) Circuit Bank 2 |
| P0331 | Knock Sensor 2 Circuit Range/Performance (Bank 2) |
| P0332 | Knock Sensor 2 Circuit Low Input (Bank 2) |
| P0333 | Knock Sensor 2 Circuit High Input (Bank 2) |
| P0334 | Knock Sensor 2 Circuit Intermittent (Bank 2) |
| P0335 | CKP Sensor A Circuit Performance |
| P0336 | Crankshaft Position (CKP) Sensor A Performance |
| P0337 | Crankshaft Position (CKP) Sensor Circuit Low Duty Cycle |
| P0338 | Crankshaft Position (CKP) Sensor Circuit High DutyCycle |
| P0339 | Crankshaft Position (CKP) Sensor Circuit Intermittent |
| P0340 | Camshaft Position (CMP) Sensor Circuit |
| P0341 | Camshaft Position (CMP) Sensor Performance |
| P0342 | Camshaft Position Sensor Circuit Low Input |
| P0343 | Camshaft Position Sensor Circuit High Input |
| P0344 | Camshaft Position Sensor Circuit Intermittent |
| P0350 | Ignition Coil Primary/Secondary Circuit Malfunction |
| P0351 | Ignition Coil 1 Control Circuit |
| P0352 | Ignition Coil 2 Control Circuit |
| P0353 | Ignition Coil 3 Control Circuit |
| P0354 | Ignition Coil 4 Control Circuit |
| P0355 | Ignition Coil 5 Control Circuit |
| P0356 | Ignition Coil 6 Control Circuit |
| P0357 | Ignition Coil 7 Control Circuit |
| P0358 | Ignition Coil 8 Control Circuit |
| P0359 | Ignition Coil I Primary/Secondary Circuit Malfunction |
| P0360 | Ignition Coil J Primary/Secondary Circuit Malfunction |
| P0361 | Ignition Coil K Primary/Secondary Circuit Malfunction |
| P0362 | Ignition Coil L Primary/Secondary Circuit Malfunction |
| P0370 | Timing Reference High Resolution Signal A Malfunction |
| P0371 | IC 24X Reference CKT Too Many Pulses |
| P0372 | IC 24X Reference Circuit Missing Pulses |
| P0373 | Timing Reference High Resolution Signal A Intermittent/Erratic Pulses |
| P0374 | Timing Reference High Resolution Signal A No Pulses |
| P0375 | Timing Reference High Resolution Signal B Malfunction |
| P0376 | Timing Reference High Resolution Signal B Too ManyPulses |
| P0377 | Timing Reference High Resolution Signal B Too Few Pulses |
| P0378 | Timing Reference High Resolution Signal B Intermittent/Erratic Pulses |
| P0379 | Timing Reference High Resolution Signal B No Pulses |
| P0380 | "Glow Plug/Heater Circuit ""A"" Malfunction" |
| P0381 | Glow Plug/Heater Indicator Circuit Malfunction |
| P0382 | Exhaust Gas Recirculation Flow Malfunction |
| P0385 | Crankshaft Position (CKP) Sensor B Circuit |
| P0386 | Crankshaft Position (CKP) Sensor B Performance |
| P0387 | Crankshaft Position Sensor B Circuit Low Input |
| P0388 | Crankshaft Position Sensor B Circuit High Input |
| P0389 | Crankshaft Position Sensor B Circuit Intermittent |
| P0400 | Exhaust Gas Recirculation Flow Malfunction |
| P0401 | Exhaust Gas Recirculation (EGR) Flow Insufficient |
| P0402 | Exhaust Gas Recirculation Flow Excessive Detected |
| P0403 | Exhaust Gas Recirculation (EGR) Solenoid Control Circuit |
| P0404 | Exhaust Gas Recirculation (EGR) Open Position Performance |
| P0405 | Exhaust Gas Recirculation (EGR) Position Sensor Circuit Low Voltage |
| P0406 | Exhaust Gas Recirculation Sensor A Circuit High |
| P0407 | Exhaust Gas Recirculation Sensor B Circuit Low |
| P0408 | Exhaust Gas Recirculation Sensor B Circuit High |
| P0410 | Secondary Air Injection (AIR) System |
| P0411 | Secondary Air Injection (AIR) System |
| P0412 | Secondary Air Injection (AIR) Solenoid Relay Control Circuit Bank 1 |
| P0413 | Secondary Air Injection System Switching Valve A Circuit Open |
| P0414 | Secondary Air Injection System Switching Valve A Circuit Shorted |
| P0415 | Secondary Air Injection System Switching Valve B Circuit Malfunction |
| P0416 | Secondary Air Injection System Switching Valve B Circuit Open |
| P0417 | Secondary Air Injection System Switching Valve B Circuit Shorted |
| P0418 | Secondary Air Injection (AIR) Pump Relay Control Circuit Bank 1 |
| P0419 | Secondary Air Injection (AIR) Pump Relay Control Circuit Bank 2 |
| P0420 | Catalyst System Low Efficiency |
| P0421 | Warm Up Catalyst Efficiency Below Threshold (Bank 1) |
| P0422 | Catalyst System Low Efficiency Bank 1 |
| P0423 | Heated Catalyst Efficiency Below Threshold (Bank 1) |
| P0424 | Heated Catalyst Temperature Below Threshold (Bank 1) |
| P0430 | Catalyst System Low Efficiency Bank 2 |
| P0431 | Warm Up Catalyst Efficiency Below Threshold (Bank 2) |
| P0432 | Catalyst System Low Efficiency Bank 2 |
| P0433 | Heated Catalyst Efficiency Below Threshold (Bank 2) |
| P0434 | Heated Catalyst Temperature Below Threshold (Bank 2) |
| P0440 | Evaporative Emission (EVAP) System |
| P0441 | Evaporative Emission Control System Incorrect PurgeFlow |
| P0442 | Evaporative Emission (EVAP) System Small Leak Detected (often this is a loose or bad gas cap!) |
| P0443 | EVAP Purge Solenoid Valve 1 Control CKT |
| P0444 | Evaporative Emission Control System Purge Control Valve Circuit Open |
| P0445 | Evaporative Emission Control System Purge Control Valve Circuit Shorted |
| P0446 | EVAP Vent Solenoid Valve Control System |
| P0447 | Evaporative Emission Control System Vent Control Circuit Open |
| P0448 | Evaporative Emission Control System Vent Control Circuit Shorted |
| P0449 | Evaporative Emission (EVAP) Vent Solenoid Control Circuit |
| P0450 | Fuel Tank Pressure Sensor Circuit |
| P0451 | Evaporative Emission Control System Pressure SensorRange/Performance |
| P0452 | Fuel Tank Pressure Sensor Circuit Low Voltage |
| P0453 | Fuel Tank Pressure Sensor Circuit High Voltage |
| P0454 | Evaporative Emission Control System Pressure SensorIntermittent |
| P0455 | Evaporative Emission (EVAP) System Leak Detected |
| P0460 | Fuel Level Sensor Circuit |
| P0461 | Fuel Level Sensor Performance |
| P0462 | Fuel Level Sensor Circuit Low Voltage |
| P0463 | Fuel Level Sensor Circuit High Voltage |
| P0464 | Fuel Level Sensor Circuit Intermittent |
| P0465 | Purge Flow Sensor Circuit Malfunction |
| P0466 | Purge Flow Sensor Circuit Range/Performance |
| P0467 | Purge Flow Sensor Circuit Low Input |
| P0468 | Purge Flow Sensor Circuit High Input |
| P0469 | Purge Flow Sensor Circuit Intermittent |
| P0470 | Exhaust Pressure Sensor Malfunction |
| P0471 | Exhaust Pressure Sensor Range/Performance |
| P0472 | Exhaust Pressure Sensor Low |
| P0473 | Exhaust Pressure Sensor High |
| P0474 | Exhaust Pressure Sensor Intermittent |
| P0475 | Exhaust Pressure Control Valve Malfunction |
| P0476 | Exhaust Pressure Control Valve Range/Performance |
| P0477 | Exhaust Pressure Control Valve Low |
| P0478 | Exhaust Pressure Control Valve High |
| P0479 | Exhaust Pressure Control Valve Intermittent |
| P0480 | Cooling Fan Relay 1 Control Circuit |
| P0481 | Cooling Fan Relay 2 Control Circuit |
| P0482 | Cooling Fan 3 Control Circuit Malfunction |
| P0483 | Cooling Fan Rationality Check Malfunction |
| P0484 | Cooling Fan Circuit Over Current |
| P0485 | Cooling Fan Power/Ground Circuit Malfunction |
| P0496 | Evaporative Emission (EVAP) System Flow During Non-Purge |