Emission Controls

171 diagnostic codes in this category

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The P0400 code indicates that the Engine Control Module (ECM) has detected insufficient or excessive exhaust...

The P0401 code indicates that the Engine Control Module (ECM) has detected insufficient exhaust gas...

The P0402 code indicates that the Engine Control Module (ECM) has detected excessive exhaust gas...

The P0403 code indicates a malfunction in the exhaust gas recirculation (EGR) system's electrical circuit....

The P0404 code indicates that the Engine Control Module (ECM) has detected a malfunction in the Exhaust Gas...

The P0405 code indicates that the Engine Control Module (ECM) has detected a low voltage signal from the...

The P0406 code indicates that the Engine Control Module (ECM) has detected a high voltage signal from the...

The P0407 code indicates that the Engine Control Module (ECM) has detected a low voltage signal from the...

The P0408 code indicates that the Engine Control Module (ECM) has detected a high voltage signal from the...

The P0409 code indicates a problem in the electrical circuit of the Exhaust Gas Recirculation (EGR) sensor....

The P040A code indicates a problem with the Exhaust Gas Recirculation (EGR) temperature sensor circuit. This...

The P040B code indicates that the Engine Control Module (ECM) has detected a signal from the Exhaust Gas...

The P040C code indicates that the Engine Control Module (ECM) has detected a low voltage signal from the...

The P040D code indicates that the Engine Control Module (ECM) has detected a voltage signal from the Exhaust...

The P040E code indicates that the Engine Control Module (ECM) has detected an intermittent or erratic signal...

The P040F code indicates that the Engine Control Module (ECM) has detected a correlation error between the...

The P0410 code indicates a malfunction in the secondary air injection system, which pumps fresh air into the...

The P0411 code indicates that the engine control module (ECM) has detected an incorrect flow in the secondary...

The P0412 code indicates a malfunction in the electrical circuit of the secondary air injection (SAI) system...

The P0413 code indicates that the Powertrain Control Module (PCM) has detected an open circuit in the...

The P0414 code indicates a short circuit in the secondary air injection (SAI) system switching valve 'A'...

The P0415 code indicates a malfunction in the electrical circuit of the secondary air injection system...

The P0416 code indicates that the Powertrain Control Module (PCM) has detected an open circuit in the...

The P0417 code indicates a short circuit in the secondary air injection (SAI) system switching valve B...

The P0418 code indicates a malfunction in the electrical circuit for relay 'A' of the secondary air injection...

The P0419 code indicates a malfunction in the electrical circuit of relay 'B' for the secondary air injection...

The P041A code indicates a problem with the Exhaust Gas Recirculation (EGR) temperature sensor circuit. This...

The P041B code indicates that the Engine Control Module (ECM) has detected a signal from the Exhaust Gas...

The P041C code indicates that the Engine Control Module (ECM) has detected a low voltage signal from the...

The P041D code indicates that the Engine Control Module (ECM) has detected a voltage signal from the Exhaust...

The P041E code indicates that the Engine Control Module (ECM) has detected an intermittent or erratic signal...

The P041F code indicates that the powertrain control module (PCM) has detected a low voltage condition in the...

P0420 means the catalytic converter on Bank 1 is no longer cleaning the exhaust efficiently enough to satisfy...

The P0421 code indicates that the engine control module (ECM) has detected that the catalytic converter on...

The P0422 code indicates that the catalytic converter on bank 1 is operating below its expected efficiency...

The P0423 code indicates that the heated catalytic converter on Bank 1 is operating below its expected...

The P0424 code indicates that the engine control module (ECM) has detected that the temperature of the heated...

The P0425 code indicates a problem with the catalyst temperature sensor circuit for Bank 1, Sensor 1. This...

The P0426 code indicates that the engine control module (ECM) has detected a malfunction in the catalyst...

The P0427 code indicates that the catalyst temperature sensor (Bank 1, Sensor 1) is reporting a voltage lower...

The P0428 code indicates that the catalyst temperature sensor for Bank 1, Sensor 1 is reporting a voltage or...

The P0429 code indicates a problem with the heater control circuit for the catalytic converter's oxygen...

The P042A code indicates a problem with the catalyst temperature sensor circuit for Bank 1 Sensor 2. This...

The P042B code indicates that the Engine Control Module (ECM) has detected a malfunction in the catalyst...

The P042C code indicates that the Engine Control Module (ECM) has detected a low voltage signal from the...

The P042D code indicates that the powertrain control module (PCM) has detected a high voltage signal from the...

The P042E code indicates that the Exhaust Gas Recirculation (EGR) system is stuck in the open position. This...

The P042F code indicates that the Exhaust Gas Recirculation (EGR) system is stuck closed, meaning the EGR...

P0430 means the catalytic converter on Bank 2 is no longer cleaning the exhaust efficiently enough to satisfy...

The P0431 code indicates that the catalytic converter on Bank 2 (the side of the engine opposite cylinder #1)...

P0432 indicates that the catalytic converter on Bank 2 (the side of the engine opposite cylinder #1) is...

The P0433 code indicates that the heated catalytic converter on Bank 2 (the side of the engine not containing...

The P0434 code indicates that the powertrain control module (PCM) has detected that the temperature of the...

The P0435 code indicates a malfunction in the catalyst temperature sensor circuit for Bank 2, Sensor 1. This...

The P0436 code indicates that the Engine Control Module (ECM) has detected a malfunction in the catalyst...

The P0437 code indicates that the catalyst temperature sensor on Bank 2 (the side of the engine opposite...

The P0438 code indicates that the powertrain control module (PCM) has detected a voltage signal from the...

The P0439 code indicates a malfunction in the catalyst heater control circuit for Bank 2 (the side of the...

The P043A code indicates a problem with the catalyst temperature sensor circuit for Bank 2, Sensor 2. This...

The P043B code indicates that the Engine Control Module (ECM) has detected a malfunction in the catalyst...

The P043C code indicates that the powertrain control module (PCM) has detected a low voltage signal from the...

The P043D code indicates that the powertrain control module (PCM) has detected a high voltage signal from the...

The P043E code indicates that the powertrain control module (PCM) has detected insufficient airflow through...

The P043F code indicates that the powertrain control module (PCM) has detected an abnormally high flow...

P0440 indicates a general fault in the evaporative emission control (EVAP) system, which stores and burns...

The P0441 code indicates that the engine control module (ECM) has detected an incorrect purge flow in the...

P0442 indicates a small leak in the evaporative emission control (EVAP) system. The system, which must remain...

The P0443 code indicates a problem in the electrical circuit of the evaporative emission control system purge...

The P0444 code indicates that the Powertrain Control Module (PCM) has detected an open circuit in the...

The P0445 code indicates a short circuit in the evaporative emission control system purge control valve...

The P0446 code indicates a malfunction in the evaporative emission control (EVAP) system vent control...

The P0447 code indicates that the Powertrain Control Module (PCM) has detected an open circuit in the vent...

The P0448 code indicates a short circuit in the evaporative emission control (EVAP) vent control circuit. The...

The P0449 code indicates a malfunction in the circuit of the evaporative emission control (EVAP) vent valve...

The P044A code indicates a problem in the electrical circuit of the Exhaust Gas Recirculation (EGR) sensor....

The P044B code indicates that the Engine Control Module (ECM) has detected a signal from the Exhaust Gas...

The P044C code indicates that the Powertrain Control Module (PCM) has detected a low voltage condition in the...

The P044D code indicates that the Engine Control Module (ECM) has detected a high voltage signal from the...

The P044E code indicates that the Engine Control Module (ECM) has detected an intermittent or erratic signal...

The P044F code indicates that the Powertrain Control Module (PCM) has detected a high voltage condition in...

The P0450 code indicates a malfunction in the evaporative emission control system pressure sensor circuit....

The P0451 code indicates that the Engine Control Module (ECM) has detected a malfunction in the evaporative...

The P0452 code indicates that the Powertrain Control Module (PCM) has detected a low voltage signal from the...

The P0453 code indicates that the Engine Control Module (ECM) has detected a voltage signal from the...

The P0454 code indicates that the Powertrain Control Module (PCM) has detected an intermittent or erratic...

P0455 indicates a large leak detected in the evaporative emission control (EVAP) system, which must stay...

The P0456 code indicates that the engine control module (ECM) has detected a small leak in the evaporative...

Code P0457 indicates that the powertrain control module (PCM) has detected a large leak in the evaporative...

The P0458 code indicates that the powertrain control module (PCM) has detected a low voltage condition in the...

The P0459 code indicates a high voltage condition in the purge control valve circuit of the evaporative...

The P045A code indicates a problem in the Exhaust Gas Recirculation (EGR) control circuit. The EGR system...

The P045B code indicates that the Engine Control Module (ECM) has detected a performance or range issue in...

The P045C code indicates that the Engine Control Module (ECM) has detected a low voltage condition in the...

The P045D code indicates that the Engine Control Module (ECM) has detected a high voltage condition in the...

The P045E code indicates that the Exhaust Gas Recirculation (EGR) valve is stuck in the open position. This...

The P045F code indicates that the Powertrain Control Module (PCM) has detected the Exhaust Gas Recirculation...

The P0460 code indicates a problem in the fuel level sensor circuit. This sensor, located in the fuel tank,...

The P0461 code indicates that the Engine Control Module (ECM) has detected an issue with the fuel level...

The P0462 code indicates that the Engine Control Module (ECM) has detected a voltage signal from the fuel...

The P0463 code indicates that the Engine Control Module (ECM) has detected a voltage signal from the fuel...

The P0464 code indicates that the powertrain control module (PCM) has detected an intermittent signal from...

The P0465 code indicates a problem in the purge flow sensor circuit, which monitors the flow of fuel vapors...

The P0466 code indicates that the Engine Control Module (ECM) has detected an issue with the purge flow...

The P0467 code indicates that the Engine Control Module (ECM) has detected a low voltage signal from the...

The P0468 code indicates that the Engine Control Module (ECM) has detected a voltage signal from the purge...

The P0469 code indicates an intermittent fault in the purge flow sensor circuit, which is part of the...

The P046A code indicates that the Engine Control Module (ECM) has detected a correlation issue between the...

The P046B code indicates that the Engine Control Module (ECM) has detected a correlation issue between the...

The P046C code indicates that the Engine Control Module (ECM) has detected a signal from the Exhaust Gas...

The P046D code indicates that the Engine Control Module (ECM) has detected an intermittent or erratic signal...

The P046E code indicates a problem with the Exhaust Gas Recirculation (EGR) sensor circuit, specifically that...

The P046F code indicates that the Engine Control Module (ECM) has detected an intermittent or erratic signal...

The P0470 code indicates a malfunction in the exhaust back pressure sensor circuit. This sensor monitors...

The P0471 code indicates that the Engine Control Module (ECM) has detected a signal from the exhaust back...

The P0472 code indicates that the Engine Control Module (ECM) has detected a voltage signal from the exhaust...

The P0473 code indicates that the Engine Control Module (ECM) has detected a voltage signal from the exhaust...

The P0474 code indicates that the Engine Control Module (ECM) has detected an intermittent signal from the...

The P0475 code indicates a malfunction in the exhaust pressure control valve circuit. This valve is part of...

The P0476 code indicates that the Engine Control Module (ECM) has detected a performance issue with the...

The P0477 code indicates that the Engine Control Module (ECM) has detected a low voltage or signal from the...

The P0478 code indicates that the Engine Control Module (ECM) has detected a voltage signal from the exhaust...

The P0479 code indicates that the Powertrain Control Module (PCM) has detected an intermittent signal from...

The P047A code indicates a problem with the exhaust pressure sensor circuit, typically found in diesel...

The P047B code indicates that the Engine Control Module (ECM) has detected an exhaust pressure sensor signal...

The P047C code indicates that the Engine Control Module (ECM) has detected a voltage signal from the exhaust...

The P047D code indicates that the Engine Control Module (ECM) has detected a voltage signal from the exhaust...

The P047E code indicates that the Engine Control Module (ECM) has detected an intermittent or erratic signal...

The P047F code indicates that the exhaust pressure control valve, typically located in the exhaust system of...

The P0480 code indicates a malfunction in the control circuit of the cooling fan 1 (usually the primary fan)....

The P0481 code indicates a malfunction in the control circuit of cooling fan 2 (the secondary fan). The...

The P0482 code indicates a malfunction in the control circuit of cooling fan 3, typically the electric fan...

The P0483 code indicates that the powertrain control module (PCM) has detected a malfunction in the cooling...

The P0484 code indicates that the powertrain control module (PCM) has detected an excessive current draw in...

The P0485 code indicates a malfunction in the power or ground circuit of the engine cooling fan. This circuit...

The P0486 code indicates a problem in the electrical circuit of the Exhaust Gas Recirculation (EGR) sensor,...

The P0487 code indicates that the Powertrain Control Module (PCM) has detected an open circuit in the Exhaust...

The P0488 code indicates that the Engine Control Module (ECM) has detected a malfunction in the Exhaust Gas...

The P0489 code indicates that the Engine Control Module (ECM) has detected a low voltage condition in the...

The P048A code indicates that the Engine Control Module (ECM) has detected the exhaust pressure control valve...

The P048B code indicates a problem with the exhaust pressure control valve position sensor or its circuit....

The P048C code indicates that the Engine Control Module (ECM) has detected a signal from the exhaust pressure...

The P048D code indicates that the Engine Control Module (ECM) has detected a low voltage signal from the...

The P048E code indicates that the Engine Control Module (ECM) has detected a voltage signal from the exhaust...

The P048F code indicates that the Engine Control Module (ECM) has detected an intermittent or erratic signal...

Code P0490 indicates that the Engine Control Module (ECM) has detected a voltage signal from the Exhaust Gas...

The secondary air injection system pumps fresh air into the exhaust stream during cold starts to reduce...

The P0492 code indicates that the engine control module (ECM) has detected insufficient airflow in the...

The P0493 code indicates that the engine cooling fan is spinning faster than the commanded speed. This is...

The P0494 code indicates that the Engine Control Module (ECM) has detected the cooling fan speed is lower...

The P0495 code indicates that the Engine Control Module (ECM) has detected the cooling fan is running at an...

The P0496 code indicates that the engine control module (ECM) has detected an unintended flow of fuel vapor...

The P0497 code indicates that the engine control module (ECM) has detected insufficient purge flow in the...

The P0498 code indicates that the Powertrain Control Module (PCM) has detected a low voltage condition in the...

The P0499 code indicates that the Powertrain Control Module (PCM) has detected a high voltage condition in...

The P049A code indicates that the Engine Control Module (ECM) has detected insufficient flow in the Exhaust...

The P049B code indicates that the Engine Control Module (ECM) has detected insufficient exhaust gas...

The P049C code indicates that the Engine Control Module (ECM) has detected excessive exhaust gas...

The P049D code indicates that the Engine Control Module (ECM) has detected that the Exhaust Gas Recirculation...

The P049E code indicates that the Engine Control Module (ECM) has detected that the Exhaust Gas Recirculation...

The P049F code indicates that the Exhaust Pressure Control Valve is stuck or malfunctioning. This valve...

The P04A0 code indicates that the Engine Control Module (ECM) has detected that the exhaust pressure control...

The P04A1 code indicates that the Engine Control Module (ECM) has detected a low voltage or signal from the...

The P04A2 code indicates that the Engine Control Module (ECM) has detected the exhaust pressure control valve...

The P04A3 code indicates that the Engine Control Module (ECM) has detected an intermittent fault in the...

The P04A4 code indicates that the Exhaust Pressure Control Valve (EPCV) is stuck open. This valve regulates...

The P04A5 code indicates that the Engine Control Module (ECM) has detected the exhaust pressure control valve...

The P04A6 code indicates a problem with the exhaust pressure control valve position sensor or its circuit....

The P04A7 code indicates that the Engine Control Module (ECM) has detected a signal from the exhaust pressure...

The P04A8 code indicates that the Engine Control Module (ECM) has detected a low voltage signal from the...

The P04A9 code indicates that the Engine Control Module (ECM) has detected a high voltage signal from the...

The P04AA code indicates an intermittent or erratic signal from the exhaust pressure control valve position...