Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2000 Plymouth Neon Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Engine Performance DTCS
ENGINE PERFORMANCE DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description |
|---|---|
| P0106 | BAROMETRIC PRESSURE OUT OF RANGE |
| P0107 | MAP SENSOR VOLTS TOO LOW |
| P0108 | MAP SENSOR VOLTS TOO HIGH |
| P0117 | ECT SENSOR VOLTAGE TOO LOW |
| P0118 | ECT SENSOR VOLTAGE TOO HIGH |
| P0121 | TPS VOLTAGE DOES NOT AGREE WITH MAP |
| P0122 | THROTTLE POSITION SENSOR VOLTAGE LOW |
| P0123 | THROTTLE POSITION SENSOR VOLTAGE HIGH |
| P0125 | CLOSED LOOP TEMPERATURE NOT REACHED |
| P0131 | O2 SENSOR 1/1 SHORTED TO GROUND |
| P0132 | O2 SENSOR 1/1 SHORTED TO VOLTAGE |
| P0133 | O2 SENSOR 1/1 SLOW RESPONSE |
| P0134 | O2 SENSOR 1/1 STAYS AT CENTER |
| P0135 | O2 SENSOR 1/1 HEATER FAILURE |
| P0137 | O2 SENSOR 1/2 VOLTAGE SHORTED TO GROUND |
| P0138 | O2 SENSOR 1/2 SHORTED TO VOLTAGE |
| P0139 | O2 SENSOR 1/2 SLOW RESPONSE |
| P0140 | O2 SENSOR 1/2 STAYS AT CENTER |
| P0141 | O2 SENSOR 1/2 HEATER FAILURE |
| P0171 | 1/1 FUEL SYSTEM LEAN |
| P0172 | 1/1 FUEL SYSTEM RICH |
| P0201 | INJECTOR NO. 1 CONTROL CIRCUIT |
| P0202 | INJECTOR NO. 2 CONTROL CIRCUIT |
| P0203 | INJECTOR NO. 3 CONTROL CIRCUIT |
| P0204 | INJECTOR NO. 4 CONTROL CIRCUIT |
| P0300 | MULTIPLE CYLINDER MISFIRE |
| P0301 | CYLINDER #1 MISFIRE |
| P0302 | CYLINDER #2 MISFIRE |
| P0303 | CYLINDER #3 MISFIRE |
| P0304 | CYLINDER #4 MISFIRE |
| P0320 | NO CRANK REFERENCE SIGNAL AT PCM |
| P0340 | NO CAM SIGNAL AT PCM |
| P0351 | IGNITION COIL NO. 1 PRIMARY CIRCUIT |
| P0352 | IGNITION COIL NO. 2 PRIMARY CIRCUIT |
| P0420 | CATALYST 1/1 EFFICIENCY FAILURE |
| P0441 | EVAP PURGE FLOW MONITOR |
| P0442 | EVAP LEAK MONITOR MEDIUM (.040") LEAK DETECTED |
| P0443 | EVAP PURGE SOLENOID CIRCUIT |
| P0455 | EVAP LEAK MONITOR LARGE LEAK DETECTED |
| P0456 | EVAP LEAK MONITOR SMALL (.020") LEAK DETECTED |
| P0460 | FUEL LEVEL UNIT NO CHANGE OVER MILES |
| P0462 | FUEL LEVEL SENDING UNIT VOLTS TOO LOW |
| P0463 | FUEL LEVEL SENDING UNIT VOLTS TOO HIGH |
| P0500 | NO VEHICLE SPEED SENSOR SIGNAL |
| P0505 | IDLE AIR CONTROL MOTOR CIRCUITS |
| P0551 | POWER STEERING SWITCH FAILURE |
| P0600 | PCM FAILURE SPI COMMUNICATIONS |
| P0601 | INTERNAL CONTROLLER FAILURE |
| P0645 | A/C CLUTCH RELAY CIRCUIT |
| P0703 | BRAKE SWITCH SENSE CIRCUIT |
| P1192 | INLET AIR TEMP SENSOR VOLTAGE LOW |
| P1193 | INLET AIR TEMP SENSOR VOLTAGE HIGH |
| P1195 | O2 SENSOR 1/1 SLOW DURING CATALYST MONITOR |
| P1281 | ENGINE IS COLD TOO LONG |
| P1282 | FUEL PUMP RELAY CONTROL CIRCUIT |
| P1294 | TARGET IDLE NOT REACHED |
| P1297 | NO CHANGE IN MAP FROM START TO RUN |
| P1299 | VACUUM LEAK FOUND (IAC FULLY SEATED) |
| P1388 | AUTO SHUTDOWN RELAY CONTROL CIRCUIT |
| P1389 | NO ASD RELAY OUTPUT VOLTAGE AT PCM |
| P1390 | TIMING BELT SKIPPED 1 TOOTH OR MORE |
| P1391 | INTERMITTENT LOSS OF CMP OR CKP |
| P1398 | MISFIRE ADAPTIVE NUMERATOR AT LIMIT |
| P1486 | EVAP LEAK MONITOR PINCHED HOSE FOUND |
| P1490 | LOW SPEED FAN CONTROL RELAY CIRCUIT |
| P1494 | LEAK DETECT PUMP SW OR MECHANICAL FAULT |
| P1495 | LEAK DETECTION PUMP SOLENOID CIRCUIT |
| P1496 | 5-VOLT SUPPLY OUTPUT TOO LOW |
| P1696 | PCM FAILURE EEPROM WRITE DENIED |
| P1697 | PCM FAILURE SRI MILE NOT STORED |
| P1685 | INVALID SKIM KEY |
| P1686 | NO SKIM BUS MESSAGE RECEIVED |
| P1687 | NO MIC BUS MESSAGE |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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