Emissions Codes
704 OBD-II diagnostic trouble codes in this category.
Showing page 7 of 8 (704 codes total)
| Code | Description | Subsystem | Severity |
|---|---|---|---|
| P2AE1 | Intake Air O2 Sensor Pumping Current Trim Circuit Low Bank 1 | Oxygen Sensor | Medium |
| P2AE2 | Intake Air O2 Sensor Pumping Current Trim Circuit High Bank 1 | Oxygen Sensor | Medium |
| P2AE3 | Intake Air O2 Sensor Pumping Current Circuit Open Bank 1 | Oxygen Sensor | Medium |
| P2AE4 | Intake Air O2 Sensor Pumping Current Circuit Low Bank 1 | Oxygen Sensor | Medium |
| P2AE5 | Intake Air O2 Sensor Pumping Current Circuit High Bank 1 | Oxygen Sensor | Medium |
| P2AE6 | Intake Air O2 Sensor Negative Current Control Circuit Open Bank 1 | Oxygen Sensor | Medium |
| P2AE7 | Intake Air O2 Sensor Negative Current Control Circuit Low Bank 1 | Oxygen Sensor | Medium |
| P2AE8 | Intake Air O2 Sensor Negative Current Control Circuit High Bank 1 | Oxygen Sensor | Medium |
| P2AE9 | Intake Air O2 Sensor Pumping Current Trim Circuit Open Bank 2 | Oxygen Sensor | Medium |
| P2AEA | Intake Air O2 Sensor Pumping Current Trim Circuit Low Bank 2 | Oxygen Sensor | Medium |
| P2AEB | Intake Air O2 Sensor Pumping Current Trim Circuit High Bank 2 | Oxygen Sensor | Medium |
| P2AEC | Intake Air O2 Sensor Pumping Current Circuit Open Bank 2 | Oxygen Sensor | Medium |
| P2AED | Intake Air O2 Sensor Pumping Current Circuit Low Bank 2 | Oxygen Sensor | Medium |
| P2AEE | Intake Air O2 Sensor Pumping Current Circuit High Bank 2 | Oxygen Sensor | Medium |
| P2AEF | Intake Air O2 Sensor Negative Current Control Circuit Open Bank 2 | Oxygen Sensor | Medium |
| P2AF0 | Intake Air O2 Sensor Negative Current Control Circuit Low Bank 2 | Oxygen Sensor | Medium |
| P2AF1 | Intake Air O2 Sensor Negative Current Control Circuit High Bank 2 | Oxygen Sensor | Medium |
| P2B88 | Intake Air O2 Sensor Circuit Bank 1 | Oxygen Sensor | Medium |
| P2B89 | Intake Air O2 Sensor Circuit Low Voltage Bank 1 | Oxygen Sensor | Medium |
| P2B8A | Intake Air O2 Sensor Circuit High Voltage Bank 1 | Oxygen Sensor | Medium |
| P2B8B | Intake Air O2 Sensor Heater Control Circuit/Open Bank 1 | Oxygen Sensor | Medium |
| P2B8C | Intake Air O2 Sensor Heater Control Circuit Range/Performance Bank 1 | Oxygen Sensor | Medium |
| P2B8D | Intake Air O2 Sensor Heater Control Circuit Low Bank 1 | Oxygen Sensor | Medium |
| P2B8E | Intake Air O2 Sensor Heater Control Circuit High Bank 1 | Oxygen Sensor | Medium |
| P2C62 | O2 Sensor Pumping Current Trim Circuit/Open Bank 1 Sensor 3 | Oxygen Sensor | Medium |
| P2C63 | O2 Sensor Pumping Current Trim Circuit Low Bank 1 Sensor 3 | Oxygen Sensor | Medium |
| P2C64 | O2 Sensor Pumping Current Trim Circuit High Bank 1 Sensor 3 | Oxygen Sensor | Medium |
| P2C65 | O2 Sensor Out of Range During Deceleration Bank 1 Sensor 3 | Oxygen Sensor | Medium |
| P2E03 | Gear Lever Position Sensor A Circuit High | Emission Control | Medium |
| P2E20 | Drive Motor A Phase Y Current Sensor Circuit Range/Performance | Hybrid/EV System | High |
| P2E21 | Drive Motor A Phase Y Current Sensor Circuit Low | Hybrid/EV System | High |
| P2E22 | Drive Motor A Phase Y Current Sensor Circuit High | Hybrid/EV System | High |
| P2E23 | Drive Motor A Phase Z Current Sensor Circuit | Hybrid/EV System | High |
| P2E24 | Drive Motor A Phase Z Current Sensor Circuit Range/Performance | Hybrid/EV System | High |
| P2E25 | Drive Motor A Phase Z Current Sensor Circuit Low | Hybrid/EV System | High |
| P2E26 | Drive Motor A Phase Z Current Sensor Circuit High | Hybrid/EV System | High |
| P2E27 | Drive Motor A Phase X-Y-Z Current Sensor Correlation | Hybrid/EV System | High |
| P2E28 | Drive Motor A Excitation Current Sensor Performance | Hybrid/EV System | High |
| P2E29 | Drive Motor A Excitation Current Sensor Circuit Low Voltage | Hybrid/EV System | High |
| P2E30 | Battery Charger B Module Supply Voltage Low | Hybrid/EV System | High |
| P2E31 | Battery Charger B Module Supply Voltage High | Hybrid/EV System | High |
| P2E32 | Battery Charger A Module Forced Shutdown Voltage Performance | Hybrid/EV System | High |
| P2E33 | Battery Charger A Module Forced Shutdown Voltage Low | Hybrid/EV System | High |
| P2E34 | Battery Charger A Module Forced Shutdown Voltage High | Hybrid/EV System | High |
| P2E35 | Battery Charger B Enable Circuit/Open | Hybrid/EV System | High |
| P2E36 | Battery Charger B Enable Circuit Low | Hybrid/EV System | High |
| P2E37 | Battery Charger B Enable Circuit High | Hybrid/EV System | High |
| P2E38 | Battery Charger B Enable Circuit Range/Performance | Hybrid/EV System | High |
| P2E39 | Battery Charger B Fuse | Hybrid/EV System | High |
| P2E3A | Battery Charger B Output Voltage Performance | Emission Control | Medium |
| P2E3B | Battery Charger B Output Voltage Too Low | Emission Control | Medium |
| P2E3C | Battery Charger B Output Current Performance | Emission Control | Medium |
| P2E3D | Battery Charger B Output Shorted | Emission Control | Medium |
| P2E3E | Battery Charger B Module Forced Shutdown Voltage Performance | Emission Control | Medium |
| P2E3F | Battery Charger B Module Forced Shutdown Voltage Low | Emission Control | Medium |
| P2E40 | Battery Charger B Module Forced Shutdown Voltage High | Hybrid/EV System | High |
| P2E41 | Hybrid/EV Electronics Coolant Pump B Control Circuit/Open | Hybrid/EV System | High |
| P2E42 | Hybrid/EV Electronics Coolant Pump B Performance | Hybrid/EV System | High |
| P2E43 | Hybrid/EV Electronics Coolant Pump B Control Circuit Low | Hybrid/EV System | High |
| P2E44 | Hybrid/EV Electronics Coolant Pump B Control Circuit High | Hybrid/EV System | High |
| P2E45 | Hybrid/EV Electronics Coolant Pump B Enable Circuit | Hybrid/EV System | High |
| P2E46 | Hybrid/EV Electronics Coolant Pump B Overspeed - Dry Run | Hybrid/EV System | High |
| P2E47 | Hybrid/EV Electronics Coolant Pump B Underspeed | Hybrid/EV System | High |
| P2E48 | Hybrid/EV Electronics Coolant Pump B Overspeed | Hybrid/EV System | High |
| P2E49 | Hybrid/EV Electronics Coolant Pump B Stuck/Stalled | Hybrid/EV System | High |
| P2E4A | Battery Charger Coupler Temperature Sensor C Circuit | Hybrid/EV System | High |
| P2E4B | Battery Charger Coupler Temperature Sensor C Circuit Range/Performance | Hybrid/EV System | High |
| P2E4C | Battery Charger Coupler Temperature Sensor C Circuit Low | Hybrid/EV System | High |
| P2E4D | Battery Charger Coupler Temperature Sensor C Circuit High | Hybrid/EV System | High |
| P2E4E | Battery Charger Coupler Temperature C Too High | Hybrid/EV System | High |
| P2E4F | Battery Charger Coupler Temperature Sensor D Circuit | Hybrid/EV System | High |
| P2E50 | Battery Charger Coupler Temperature Sensor D Circuit Range/Performance | Hybrid/EV System | High |
| P2E51 | Battery Charger Coupler Temperature Sensor D Circuit Low | Hybrid/EV System | High |
| P2E52 | Battery Charger Coupler Temperature Sensor D Circuit High | Hybrid/EV System | High |
| P2E53 | Battery Charger Coupler Temperature D Too High | Hybrid/EV System | High |
| P2E54 | Exhaust Pressure Sensor C Circuit | Emission Control | Medium |
| P2E55 | Exhaust Pressure Sensor C Circuit Range/Performance | Emission Control | Medium |
| P2E56 | Exhaust Pressure Sensor C Circuit Low | Emission Control | Medium |
| P2E57 | Exhaust Pressure Sensor C Circuit High | Emission Control | Medium |
| P2E6C | Hybrid/EV Battery Pack “A” Cell Thickness | Hybrid/EV System | High |
| P2E6D | Hybrid/EV Battery Pack “A” Cell Thickness Sensor Circuit High | Hybrid/EV System | High |
| P2E6E | Hybrid/EV Battery Pack “A” Cell Thickness Sensor Circuit Low | Hybrid/EV System | High |
| P2E6F | Hybrid/EV Battery Pack “A” Cell Thickness Sensor Circuit Performance | Hybrid/EV System | High |
| P2E70 | Hybrid/EV Battery Pack B Cell Thickness | Hybrid/EV System | High |
| P2E71 | Hybrid/EV Battery Pack B Cell Thickness Sensor Circuit High | Hybrid/EV System | High |
| P2E72 | Hybrid/EV Battery Pack B Cell Thickness Sensor Circuit Low | Hybrid/EV System | High |
| P2E73 | Hybrid/EV Battery Pack B Cell Thickness Sensor Circuit Performance | Hybrid/EV System | High |
| P2E74 | Hybrid/EV Battery Pack Coolant Temperature Sensor D Circuit | Hybrid/EV System | High |
| P2E75 | Hybrid/EV Battery Pack Coolant Temperature Sensor D Circuit Range/Performance | Hybrid/EV System | High |
| P2E76 | Hybrid/EV Battery Pack Coolant Temperature Sensor D Circuit Low | Hybrid/EV System | High |
| P2E77 | Hybrid/EV Battery Pack Coolant Temperature Sensor D Circuit High | Hybrid/EV System | High |
| P2E78 | Hybrid/EV Battery Pack Coolant Temperature Sensor D Circuit Intermittent/Erratic | Hybrid/EV System | High |
| P2E79 | Hybrid/EV Electronics Coolant Pump C Performance | Hybrid/EV System | High |
| P2E7A | Hybrid/EV Electronics Coolant Pump C Overspeed | Hybrid/EV System | High |
| P2E7B | Drive Motor A Excitation Current Sensor Circuit | Hybrid/EV System | High |
| P2E84 | Battery Charger B Input Voltage Sensor Circuit Range/Performance | Hybrid/EV System | High |
| P2E85 | Battery Charger B Input Voltage Sensor Circuit Low | Hybrid/EV System | High |
| P2E86 | Battery Charger B Input Voltage Sensor Circuit High | Hybrid/EV System | High |
| P2E8C | Battery Charger B Charge Sequence Signal 1 Circuit High | Hybrid/EV System | High |
| P2E8D | Battery Charger B Charge Sequence Signal 1 Circuit Low | Hybrid/EV System | High |
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.