Fault codes P26xx: control unit, cooling and auxiliary outputs
Engine and transmission codes common to all makes (SAE J2012 standard).
Official codes: 256, from smallest to largest. Tap a code to get a direct link to share.
| Code | Meaning |
|---|---|
| P2600 | Coolant Pump A Control Circuit / Open |
| P2601 | Coolant Pump A Control Circuit Performance/Stuck Off |
| P2602 | Coolant Pump Control Circuit Open |
| P2603 | Coolant Pump Control Circuit Low |
| P2604 | Coolant Pump Control Circuit High |
| P2605 | Intake Air Heater B Circuit / Open |
| P2606 | Intake Air Heater B Circuit Range/Performance |
| P2607 | Intake Air Heater B Circuit Low |
| P2608 | Intake Air Heater B Circuit High |
| P2609 | Intake Air Heater System Performance |
| P260A | PTO Control Circuit / Open |
| P260B | PTO Control Circuit Low |
| P260C | PTO Control Circuit High |
| P260D | PTO Engaged Lamp Control Circuit |
| P260E | Particulate Filter Regeneration Lamp Control Circuit |
| P260F | EVAP System Monitoring Processor Performance |
| P2610 | ECM/PCM Internal Engine Off Timer Performance |
| P2611 | A/C Refrigerant Distribution Valve A Control Circuit / Open |
| P2612 | A/C Refrigerant Distribution Valve A Control Circuit Low |
| P2613 | A/C Refrigerant Distribution Valve A Control Circuit High |
| P2614 | Camshaft Position Output Circuit/Open |
| P2615 | Camshaft A Position Signal Output Circuit Low Bank 1 |
| P2616 | Camshaft A Position Signal Output Circuit High Bank 1 |
| P2617 | Crankshaft Position Signal Output Circuit / Open |
| P2618 | Crankshaft Position Signal Output Circuit Low |
| P2619 | Crankshaft Position Signal Output Circuit High |
| P261A | Coolant Pump B Control Circuit / Open |
| P261B | Coolant Pump B Control Circuit Performance/Stuck Off |
| P261C | Coolant Pump B Control Circuit Low |
| P261D | Coolant Pump B Control Circuit High |
| P261E | Coolant Pump B Control Circuit Stuck On |
| P261F | Coolant Pump A Control Circuit Stuck On |
| P2620 | Throttle Position Output Circuit |
| P2621 | Throttle Position Output Circuit Low |
| P2622 | Throttle Position Output Circuit High |
| P2623 | Injector Control Pressure Regulator Circuit / Open |
| P2624 | Injector Control Pressure Regulator Circuit Low |
| P2625 | Injector Control Pressure Regulator Circuit High |
| P2626 | O2 Sensor Pumping Current Trim Circuit/Open Bank 1 Sensor 1 |
| P2627 | O2 Sensor Pumping Current Trim Circuit Low Bank 1 Sensor 1 |
| P2628 | O2 Sensor Pumping Current Trim Circuit High Bank 1 Sensor 1 |
| P2629 | O2 Sensor Pumping Current Trim Circuit / Open Bank 2 Sensor 1 |
| P262A | Fuel Injector - Pilot Injection Not Learned |
| P262B | Control Module Power Off Timer Performance |
| P262C | Sensor Reference Voltage G Circuit / Open |
| P262D | Sensor Reference Voltage G Circuit Low |
| P262E | Sensor Reference Voltage G Circuit High |
| P262F | Sensor Reference Voltage G Circuit Range/Performance |
| P2630 | O2 Sensor Pumping Current Trim Circuit Low Bank 2 Sensor 1 |
| P2631 | O2 Sensor Pumping Current Trim Circuit High Bank 2 Sensor 1 |
| P2632 | Fuel Pump B Control Circuit / Open |
| P2633 | Fuel Pump B Control Circuit Low |
| P2634 | Fuel Pump B Control Circuit High |
| P2635 | Fuel Pump A Low Flow / Performance |
| P2636 | Fuel Pump B Low Flow/Performance |
| P2637 | Torque Management Feedback Signal A |
| P2638 | Torque Management Feedback Signal A Range/Performance |
| P2639 | Torque Management Feedback Signal A Low |
| P263A | MIL Control Circuit Low |
| P263B | MIL Control Circuit High |
| P263C | Glow Plug Control Driver Performance |
| P263D | Reductant Heater Driver Performance |
| P263E | Glow Plug Control Module 1 Over Temperature |
| P263F | Glow Plug Control Module 2 Over Temperature |
| P2640 | Torque Management Feedback Signal A High |
| P2641 | Torque Management Feedback Signal B |
| P2642 | Torque Management Feedback Signal B Range/Performance |
| P2643 | Torque Management Feedback Signal B Low |
| P2644 | Torque Management Feedback Signal B High |
| P2645 | A Rocker Arm Actuator Control Circuit / Open Bank 1 |
| P2646 | A Rocker Arm Actuator System Performance/Stuck Off Bank 1 |
| P2647 | A Rocker Arm Actuator System Stuck On Bank 1 |
| P2648 | A Rocker Arm Actuator Control Circuit Low Bank 1 |
| P2649 | A Rocker Arm Actuator Control Circuit High Bank 1 |
| P264A | A Rocker Arm Actuator Position Sensor Circuit Bank 1 |
| P264B | A Rocker Arm Actuator Position Sensor Circuit Range/Performance Bank 1 |
| P264C | A Rocker Arm Actuator Position Sensor Circuit Low Bank 1 |
| P264D | A Rocker Arm Actuator Position Sensor Circuit High Bank 1 |
| P264E | A Rocker Arm Actuator Position Sensor Circuit Intermittent/Erratic Bank 1 |
| P264F | Engine Serial Number Not Programmed or Incompatible |
| P2650 | B Rocker Arm Actuator Control Circuit / Open Bank 1 |
| P2651 | B Rocker Arm Actuator System Performance/Stuck Off Bank 1 |
| P2652 | B Rocker Arm Actuator System Stuck On Bank 1 |
| P2653 | B Rocker Arm Actuator Control Circuit Low Bank 1 |
| P2654 | B Rocker Arm Actuator Control Circuit High Bank 1 |
| P2655 | A Rocker Arm Actuator Control Circuit / Open Bank 2 |
| P2656 | A Rocker Arm Actuator System Performance/Stuck Off Bank 2 |
| P2657 | A Rocker Arm Actuator System Stuck On Bank 2 |
| P2658 | A Rocker Arm Actuator Control Circuit Low Bank 2 |
| P2659 | A Rocker Arm Actuator Control Circuit High Bank 2 |
| P265A | B Rocker Arm Actuator Position Sensor Circuit Bank 1 |
| P265B | B Rocker Arm Actuator Position Sensor Circuit Range/Performance Bank 1 |
| P265C | B Rocker Arm Actuator Position Sensor Circuit Low Bank 1 |
| P265D | B Rocker Arm Actuator Position Sensor Circuit High Bank 1 |
| P265E | B Rocker Arm Actuator Position Sensor Circuit Intermittent/Erratic Bank 1 |
| P265F | Variable A/C Compressor Control Circuit Range/Performance |
| P2660 | B Rocker Arm Actuator Control Circuit / Open Bank 2 |
| P2661 | B Rocker Arm Actuator System Performance/Stuck Off Bank 2 |
| P2662 | B Rocker Arm Actuator System Stuck On Bank 2 |
| P2663 | B Rocker Arm Actuator Control Circuit Low Bank 2 |
| P2664 | B Rocker Arm Actuator Control Circuit High Bank 2 |
| P2665 | Fuel Shutoff Valve B Control Circuit / Open |
| P2666 | Fuel Shutoff Valve B Control Circuit Low |
| P2667 | Fuel Shutoff Valve B Control Circuit High |
| P2668 | Fuel Mode Indicator Lamp Control Circuit |
| P2669 | Actuator Supply Voltage B Circuit / Open |
| P266A | A Rocker Arm Actuator Position Sensor Circuit Bank 2 |
| P266B | A Rocker Arm Actuator Position Sensor Circuit Range/Performance Bank 2 |
| P266C | A Rocker Arm Actuator Position Sensor Circuit Low Bank 2 |
| P266D | A Rocker Arm Actuator Position Sensor Circuit High Bank 2 |
| P266E | A Rocker Arm Actuator Position Sensor Circuit Intermittent/Erratic Bank 2 |
| P266F | A/C Refrigerant Distribution Valve A Control Circuit Driver Current/Temperature Too High |
| P2670 | Actuator Supply Voltage B Circuit Low |
| P2671 | Actuator Supply Voltage B Circuit High |
| P2672 | Injection Pump Timing Offset |
| P2673 | Injection Pump Timing Calibration Not Learned |
| P2674 | Injection Pump Fuel Calibration Not Learned |
| P2675 | Air Cleaner Inlet Control Circuit / Open |
| P2676 | Air Cleaner Inlet Control Circuit Low |
| P2677 | Air Cleaner Inlet Control Circuit High |
| P2678 | Coolant Degassing Valve Control Circuit / Open |
| P2679 | Coolant Degassing Valve Control Circuit Low |
| P267A | B Rocker Arm Actuator Position Sensor Circuit Bank 2 |
| P267B | B Rocker Arm Actuator Position Sensor Circuit Range/Performance Bank 2 |
| P267C | B Rocker Arm Actuator Position Sensor Circuit Low Bank 2 |
| P267D | B Rocker Arm Actuator Position Sensor Circuit High Bank 2 |
| P267E | B Rocker Arm Actuator Position Sensor Circuit Intermittent/Erratic Bank 2 |
| P267F | Control Module Internal Temperature Sensor A Circuit Intermittent/Erratic |
| P2680 | Coolant Degassing Valve Control Circuit High |
| P2681 | Engine Coolant Bypass Valve A Control Circuit / Open |
| P2682 | Engine Coolant Bypass Valve A Control Circuit Low |
| P2683 | Engine Coolant Bypass Valve A Control Circuit High |
| P2684 | Actuator Supply Voltage C Circuit / Open |
| P2685 | Actuator Supply Voltage C Circuit Low |
| P2686 | Actuator Supply Voltage C Circuit High |
| P2687 | Fuel Supply Heater Control Circuit / Open |
| P2688 | Fuel Supply Heater Control Circuit Low |
| P2689 | Fuel Supply Heater Control Circuit High |
| P268A | Fuel Injector Calibration Not Learned/Programmed |
| P268B | High Pressure Fuel Pump Calibration Not Learned/Programmed |
| P268C | Cylinder 1 Injector Data Incompatible |
| P268D | Cylinder 2 Injector Data Incompatible |
| P268E | Cylinder 3 Injector Data Incompatible |
| P268F | Cylinder 4 Injector Data Incompatible |
| P2690 | Cylinder 5 Injector Data Incompatible |
| P2691 | Cylinder 6 Injector Data Incompatible |
| P2692 | Cylinder 7 Injector Data Incompatible |
| P2693 | Cylinder 8 Injector Data Incompatible |
| P2694 | Cylinder 9 Injector Data Incompatible |
| P2695 | Cylinder 10 Injector Data Incompatible |
| P2696 | Injector Data Incompatible |
| P2697 | Exhaust Aftertreatment Fuel Injector A Circuit / Open |
| P2698 | Exhaust Aftertreatment Fuel Injector A Performance |
| P2699 | Exhaust Aftertreatment Fuel Injector A Circuit Low |
| P269A | Exhaust Aftertreatment Fuel Injector A Circuit High |
| P269B | Exhaust Aftertreatment Glow Plug Control Circuit / Open |
| P269C | Exhaust Aftertreatment Glow Plug Control Performance |
| P269D | Exhaust Aftertreatment Glow Plug Control Circuit Low |
| P269E | Exhaust Aftertreatment Glow Plug Control Circuit High |
| P269F | Exhaust Aftertreatment Glow Plug Circuit / Open |
| P26A0 | Exhaust Aftertreatment Glow Plug Performance |
| P26A1 | Exhaust Aftertreatment Glow Plug Circuit Low |
| P26A2 | Exhaust Aftertreatment Glow Plug Circuit High |
| P26A3 | Engine Coolant Bypass Valve A Range/Performance |
| P26A4 | Engine Coolant Bypass Valve A Position Sensor Circuit |
| P26A5 | Engine Coolant Bypass Valve A Position Sensor Circuit Range/Performance |
| P26A6 | Engine Coolant Bypass Valve A Position Sensor Circuit Low |
| P26A7 | Engine Coolant Bypass Valve A Position Sensor Circuit High |
| P26A8 | Engine Coolant Bypass Valve A Position Sensor Circuit Intermittent/Erratic |
| P26A9 | Engine Coolant Bypass Valve A Position Sensor Stop/Minimum Stop Performance |
| P26AA | Engine Coolant Bypass Valve A Position Sensor Maximum Stop Performance |
| P26AB | Engine Coolant Bypass Valve A Stuck/Open |
| P26AC | Engine Coolant Bypass Valve B Control Circuit / Open |
| P26AD | Engine Coolant Bypass Valve B Control Circuit Low |
| P26AE | Engine Coolant Bypass Valve B Control Circuit High |
| P26AF | Engine Coolant Bypass Valve B Stuck/Open |
| P26B0 | Engine Coolant Bypass Valve B Range/Performance |
| P26B1 | Engine Coolant Bypass Valve A Stuck Closed |
| P26B2 | Engine Coolant Bypass Valve B Stuck Closed |
| P26B3 | Fuel Shutoff Valve A Control Circuit Performance/Stuck Off |
| P26B4 | Fuel Shutoff Valve A Control Circuit Stuck On |
| P26B5 | Fuel Shutoff Valve B Control Circuit Performance/Stuck Off |
| P26B6 | Fuel Shutoff Valve B Control Circuit Stuck On |
| P26B7 | Engine Coolant Bypass Valve C Control Circuit / Open |
| P26B8 | Engine Coolant Bypass Valve C Control Circuit Low |
| P26B9 | Engine Coolant Bypass Valve C Control Circuit High |
| P26BA | Engine Coolant Bypass Valve C Stuck/Open |
| P26BB | Engine Coolant Bypass Valve C Range/Performance |
| P26BC | Engine Coolant Bypass Valve C Stuck Closed |
| P26BD | Engine Coolant Bypass Valve D Control Circuit / Open |
| P26BE | Engine Coolant Bypass Valve D Control Circuit Low |
| P26BF | Engine Coolant Bypass Valve D Control Circuit High |
| P26C0 | Engine Coolant Bypass Valve D Stuck/Open |
| P26C1 | Engine Coolant Bypass Valve D Range/Performance |
| P26C2 | Engine Coolant Bypass Valve D Stuck Closed |
| P26C3 | Internal Control Module Transmission Range Sensor Performance |
| P26C4 | Internal Control Module Clutch Pedal Performance |
| P26C5 | Exhaust Flow Control Valve A Control Circuit / Open |
| P26C6 | Exhaust Flow Control Valve A Control Circuit Low |
| P26C7 | Exhaust Flow Control Valve A Control Circuit High |
| P26C8 | Chassis Control Module 1 Requested MIL Illumination |
| P26C9 | Chassis Control Module 2 Requested MIL Illumination |
| P26CA | Engine Coolant Pump Control Circuit / Open |
| P26CB | Engine Coolant Pump Performance/Stuck Off |
| P26CC | Engine Coolant Pump Control Circuit Low |
| P26CD | Engine Coolant Pump Control Circuit High |
| P26CE | Engine Coolant Pump Overspeed/Air In System |
| P26CF | Engine Coolant Pump Control Module System Voltage |
| P26D0 | Engine Coolant Pump Control Module System Voltage Low |
| P26D1 | Engine Coolant Pump Control Module System Voltage High |
| P26D2 | Engine Coolant Pump Control Module Over Temperature |
| P26D3 | Engine Coolant Pump Supply Voltage Circuit |
| P26D4 | Engine Coolant Pump Supply Voltage Circuit Low |
| P26D5 | Engine Coolant Pump Supply Voltage Circuit High |
| P26D6 | Engine Coolant Pump Clutch Control Circuit / Open |
| P26D7 | Engine Coolant Pump Clutch Performance/Stuck Off |
| P26D8 | Engine Coolant Pump Clutch Stuck On |
| P26D9 | Engine Coolant Pump Clutch Control Circuit Low |
| P26DA | Engine Coolant Pump Clutch Control Circuit High |
| P26DB | Engine Sound Control A Circuit / Open |
| P26DC | Engine Sound Control A Circuit Low |
| P26DD | Engine Sound Control A Circuit High |
| P26DE | Engine Sound Control A Circuit Performance |
| P26DF | Sensor Power Supply D Circuit / Open |
| P26E0 | Sensor Power Supply D Circuit Low |
| P26E1 | Sensor Power Supply D Circuit High |
| P26E2 | Fuel Mode Indicator Lamp Control Circuit Low |
| P26E3 | Fuel Mode Indicator Lamp Control Circuit High |
| P26E4 | Starter Relay B Circuit |
| P26E5 | Starter Relay B Circuit Low |
| P26E6 | Starter Relay B Circuit High |
| P26E7 | Actuator Supply Voltage D Circuit / Open |
| P26E8 | Actuator Supply Voltage D Circuit Low |
| P26E9 | Actuator Supply Voltage D Circuit High |
| P26EA | Fuel Pump Control Module B |
| P26EB | Alternative Fuel Control Module System Voltage |
| P26EC | Engine Sound Control B Circuit / Open |
| P26ED | Engine Sound Control B Circuit Low |
| P26EE | Engine Sound Control B Circuit High |
| P26EF | Engine Sound Control B Circuit Performance |
| P26F0 | Starter Relay A Stuck On |
| P26F1 | Starter Relay A Stuck Off |
| P26F2 | Starter Relay B Stuck On |
| P26F3 | Starter Relay B Stuck Off |
| P26F4 | Coolant Pump C Control Circuit / Open |
| P26F5 | Coolant Pump C Control Circuit Low |
| P26F6 | Coolant Pump C Control Circuit High |
| P26F7 | Coolant Pump C Supply Voltage Circuit |
| P26F8 | Coolant Pump C Stuck/Stalled |
| P26F9 | Coolant Pump C Control Module Overtemperature |
| P26FA | Coolant Pump C Overspeed/Air in System |
| P26FB | EGR Cooler Bypass Control Stuck Closed Bank 1 |
| P26FC | EGR Cooler Bypass Control Stuck Closed Bank 2 |
| P26FD | A/C Compressor Internal Control Module Performance |
| P26FE | Exhaust Flow Control Valve A Control Performance |
| P26FF | Auto Configuration Throttle Input Not Present Bank 2 |
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Official meanings: OBDex (public domain, CC0). Manufacturer codes: dtc-database (MIT license), probable meanings not verified by the manufacturers. The same meaning can vary depending on the model: always have a diagnosis confirmed by a professional.