Emissions Codes
704 OBD-II diagnostic trouble codes in this category.
Showing page 6 of 8 (704 codes total)
| Code | Description | Subsystem | Severity |
|---|---|---|---|
| P2445 | AIR System Pump Stuck Off Bank 1 | Emission Control | Medium |
| P2446 | AIR System Pump Stuck On Bank 2 | Emission Control | Medium |
| P2447 | AIR System Pump Stuck Off Bank 2 | Emission Control | Medium |
| P2448 | AIR System High Air Flow Bank 1 | Emission Control | Medium |
| P2449 | AIR System High Air Flow Bank 2 | Emission Control | Medium |
| P2450 | EVAP Switching Valve Performance/Stuck Off | EVAP System | Medium |
| P2451 | EVAP Switching Valve Performance/Stuck On | EVAP System | Medium |
| P2452 | Particulate Filter Pressure Sensor A Circuit | Emission Control | Medium |
| P2453 | Particulate Filter Pressure Sensor A Circuit Range/Performance | Emission Control | Medium |
| P2454 | Particulate Filter Pressure Sensor A Circuit Low | Emission Control | Medium |
| P2455 | Particulate Filter Pressure Sensor A Circuit High | Emission Control | Medium |
| P2456 | Particulate Filter Pressure Sensor A Circuit Intermittent/Erratic | Emission Control | Medium |
| P2457 | EGR Cooler A Efficiency Below Threshold | Emission Control | Medium |
| P2458 | Particulate Filter Regeneration Duration Bank 1 | Emission Control | Medium |
| P2459 | Particulate Filter Regeneration Frequency Bank 1 | Emission Control | Medium |
| P2460 | Particulate Filter Pressure Sensor B Circuit Low | Emission Control | Medium |
| P2461 | Particulate Filter Pressure Sensor B Circuit High | Emission Control | Medium |
| P2462 | Particulate Filter Pressure Sensor B Circuit Intermittent/Erratic | Emission Control | Medium |
| P2463 | Particulate Filter Restriction - Soot Accumulation Bank 1 | Emission Control | Medium |
| P2464 | Particulate Filter Differential Pressure Too Low Bank 2 | Emission Control | Medium |
| P2465 | Particulate Filter Differential Pressure Too High Bank 2 | Emission Control | Medium |
| P2466 | Exhaust Gas Temperature Sensor Circuit Bank 2 Sensor 3 | Emission Control | Medium |
| P2467 | Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 2 Sensor 3 | Emission Control | Medium |
| P2468 | Exhaust Gas Temperature Sensor Circuit Low Bank 2 Sensor 3 | Emission Control | Medium |
| P2469 | Exhaust Gas Temperature Sensor Circuit High Bank 2 Sensor 3 | Emission Control | Medium |
| P2470 | Exhaust Gas Temperature Sensor Circuit Low Bank 1 Sensor 4 | Emission Control | Medium |
| P2471 | Exhaust Gas Temperature Sensor Circuit High Bank 1 Sensor 4 | Emission Control | Medium |
| P2472 | Exhaust Gas Temperature Sensor Circuit Intermittent/Erratic Bank 1 Sensor 4 | Emission Control | Medium |
| P2473 | Exhaust Gas Temperature Sensor Circuit Bank 2 Sensor 4 | Emission Control | Medium |
| P2474 | Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 2 Sensor 4 | Emission Control | Medium |
| P2475 | Exhaust Gas Temperature Sensor Circuit Low Bank 2 Sensor 4 | Emission Control | Medium |
| P2476 | Exhaust Gas Temperature Sensor Circuit High Bank 2 Sensor 4 | Emission Control | Medium |
| P2477 | Exhaust Gas Temperature Sensor Circuit Intermittent/Erratic Bank 2 Sensor 4 | Emission Control | Medium |
| P2478 | Exhaust Gas Temperature Out of Range Bank 1 Sensor 1 | Emission Control | Medium |
| P2479 | Exhaust Gas Temperature Out of Range Bank 1 Sensor 2 | Emission Control | Medium |
| P2480 | Exhaust Gas Temperature Sensor Circuit/Open Bank 1 Sensor 5 | Emission Control | Medium |
| P2481 | Exhaust Gas Temperature Sensor Circuit Low Bank 1 Sensor 5 | Emission Control | Medium |
| P2482 | Exhaust Gas Temperature Sensor Circuit High Bank 1 Sensor 5 | Emission Control | Medium |
| P2483 | Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 1 Sensor 5 | Emission Control | Medium |
| P2484 | Exhaust Gas Temperature Sensor Circuit Intermittent/Erratic Bank 1 Sensor 5 | Emission Control | Medium |
| P2485 | Exhaust Gas Temperature Sensor Circuit/Open Bank 2 Sensor 5 | Emission Control | Medium |
| P2486 | Exhaust Gas Temperature Sensor Circuit Low Bank 2 Sensor 5 | Emission Control | Medium |
| P2487 | Exhaust Gas Temperature Sensor Circuit High Bank 2 Sensor 5 | Emission Control | Medium |
| P2488 | Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 2 Sensor 5 | Emission Control | Medium |
| P2489 | Exhaust Gas Temperature Sensor Circuit Intermittent/Erratic Bank 2 Sensor 5 | Emission Control | Medium |
| P2490 | EGR Cooler Bypass Control Circuit Low Bank 2 | Emission Control | Medium |
| P2491 | EGR Cooler Bypass Control Circuit High Bank 2 | Emission Control | Medium |
| P2492 | EGR Cooler Bypass Position Sensor Circuit Bank 1 | Emission Control | Medium |
| P2493 | EGR Cooler Bypass Position Sensor Range/Performance Bank 1 | Emission Control | Medium |
| P2494 | EGR Cooler Bypass Position Sensor Circuit Low Bank 1 | Emission Control | Medium |
| P2495 | EGR Cooler Bypass Position Sensor Circuit High Bank 1 | Emission Control | Medium |
| P2496 | EGR Cooler Bypass Position Sensor Circuit Intermittent/Erratic Bank 1 | Emission Control | Medium |
| P2497 | EGR Cooler Bypass Position Sensor Circuit Bank 2 | Emission Control | Medium |
| P2498 | EGR Cooler Bypass Position Sensor Range/Performance Bank 2 | Emission Control | Medium |
| P2499 | EGR Cooler Bypass Position Sensor Circuit Low Bank 2 | Emission Control | Medium |
| P24E2 | NH3 Sensor Circuit Range/Performance | Emission Control | Medium |
| P2626 | O2 Sensor Pumping Current Trim Circuit/Open Bank 1 Sensor 1 | Wideband O2 | Medium |
| P2627 | O2 Sensor Pumping Current Trim Circuit Low Bank 1 Sensor 1 | Oxygen Sensor | Medium |
| P2628 | O2 Sensor Pumping Current Trim Circuit High Bank 1 Sensor 1 | Oxygen Sensor | Medium |
| P2629 | O2 Sensor Pumping Current Trim Circuit/Open Bank 2 Sensor 1 | Wideband O2 | Medium |
| P2630 | O2 Sensor Pumping Current Trim Circuit Low Bank 2 Sensor 1 | Oxygen Sensor | Medium |
| P2631 | O2 Sensor Pumping Current Trim Circuit High Bank 2 Sensor 1 | Oxygen Sensor | Medium |
| P27E3 | Electric/Auxiliary Transmission Fluid Pump Control Valve Circuit/Open | Hybrid/EV System | High |
| P27E4 | Electric/Auxiliary Transmission Fluid Pump Control Valve Circuit Range/Performance | Hybrid/EV System | High |
| P27E5 | Electric/Auxiliary Transmission Fluid Pump Control Valve Circuit Low | Hybrid/EV System | High |
| P27E6 | Electric/Auxiliary Transmission Fluid Pump Control Valve Circuit High | Hybrid/EV System | High |
| P28E3 | Shift Motor Phase U-V-W Performance | Hybrid/EV System | High |
| P28E4 | Shift Motor Driver Current/Temperature Too High | Hybrid/EV System | High |
| P28E5 | Shift Motor Performance | Hybrid/EV System | High |
| P28E6 | Shift Motor Overspeed | Hybrid/EV System | High |
| P28E7 | Shift Motor Position Sensor Circuit/Open | Hybrid/EV System | High |
| P28E8 | Shift Motor Position Sensor Circuit High | Hybrid/EV System | High |
| P28E9 | Shift Motor Position Sensor Circuit Low | Hybrid/EV System | High |
| P2A00 | O2 Sensor Circuit Range/Performance Bank 1 Sensor 1 | Oxygen Sensor | Medium |
| P2A01 | O2 Sensor Circuit Range/Performance Bank 1 Sensor 2 | Oxygen Sensor | Medium |
| P2A02 | O2 Sensor Circuit Range/Performance Bank 1 Sensor 3 | Oxygen Sensor | Medium |
| P2A03 | O2 Sensor Circuit Range/Performance Bank 2 Sensor 1 | Oxygen Sensor | Medium |
| P2A04 | O2 Sensor Circuit Range/Performance Bank 2 Sensor 2 | Oxygen Sensor | Medium |
| P2A05 | O2 Sensor Circuit Range/Performance Bank 2 Sensor 3 | Oxygen Sensor | Medium |
| P2A06 | O2 Sensor Negative Voltage Bank 1 Sensor 1 | Oxygen Sensor | Medium |
| P2A07 | O2 Sensor Negative Voltage Bank 1 Sensor 2 | Oxygen Sensor | Medium |
| P2A08 | O2 Sensor Negative Voltage Bank 1 Sensor 3 | Oxygen Sensor | Medium |
| P2A09 | O2 Sensor Negative Voltage Bank 2 Sensor 1 | Oxygen Sensor | Medium |
| P2A10 | O2 Sensor Negative Voltage Bank 2 Sensor 2 | Oxygen Sensor | Medium |
| P2A11 | O2 Sensor Negative Voltage Bank 2 Sensor 3 | Oxygen Sensor | Medium |
| P2A38 | O2 Sensor Positive Current Control Circuit/Open Bank 1 Sensor 3 | Oxygen Sensor | Medium |
| P2A39 | O2 Sensor Positive Current Control Circuit Low Bank 1 Sensor 3 | Oxygen Sensor | Medium |
| P2A3A | O2 Sensor Positive Current Control Circuit High Bank 1 Sensor 3 | Oxygen Sensor | Medium |
| P2A3B | O2 Sensor Negative Current Control Circuit/Open Bank 1 Sensor 3 | Oxygen Sensor | Medium |
| P2A3C | O2 Sensor Negative Current Control Circuit Low Bank 1 Sensor 3 | Oxygen Sensor | Medium |
| P2A3D | O2 Sensor Negative Current Control Circuit High Bank 1 Sensor 3 | Oxygen Sensor | Medium |
| P2ABF | Intake Air O2 Sensor Reference Voltage Circuit/Open Bank 1 | Oxygen Sensor | Medium |
| P2AC0 | Intake Air O2 Sensor Reference Voltage Circuit Range/Performance Bank 1 | Oxygen Sensor | Medium |
| P2AC1 | Intake Air O2 Sensor Reference Voltage Circuit Low Bank 1 | Oxygen Sensor | Medium |
| P2AC2 | Intake Air O2 Sensor Reference Voltage Circuit High Bank 1 | Oxygen Sensor | Medium |
| P2AC3 | Intake Air O2 Sensor Reference Voltage Circuit/Open Bank 2 | Oxygen Sensor | Medium |
| P2AC4 | Intake Air O2 Sensor Reference Voltage Circuit Range/Performance Bank 2 | Oxygen Sensor | Medium |
| P2AC5 | Intake Air O2 Sensor Reference Voltage Circuit Low Bank 2 | Oxygen Sensor | Medium |
| P2AC6 | Intake Air O2 Sensor Reference Voltage Circuit High Bank 2 | Oxygen Sensor | Medium |
| P2AE0 | Intake Air O2 Sensor Pumping Current Trim Circuit Open Bank 1 | Oxygen Sensor | Medium |
About Emissions Codes
This page lists all 704 OBD-II diagnostic trouble codes classified under the Emissions category. These codes are stored by your vehicle's onboard computer when a sensor detects a malfunction in the emissions system. Each code begins with a letter indicating the system (P for Powertrain, B for Body, C for Chassis, U for Network) followed by four digits that identify the specific fault.
When your check engine light comes on, an OBD-II scanner reads these stored codes to help pinpoint the problem. Generic codes (where the second digit is 0) follow the SAE J2012 standard and mean the same thing on every vehicle. Manufacturer-specific codes (where the second digit is 1) may have different meanings depending on the vehicle brand.
Click any code in the table above to see its full description, possible causes, common symptoms, and step-by-step repair guidance. Use the search box to quickly find a specific code within this category.