OBD2 · Powertrain
P26xx codes: auxiliary outputs — coolant pumps, rocker arms, injection pump
84 codes in this range, all generic — the same meaning on every make. The control modules themselves and the circuits they drive: internal memory and processor self-tests, sensor reference voltages, glow plugs, coolant pumps, relays and other outputs.
What usually causes codes in this area
- Low or unstable supply voltage and poor grounds
- A shorted sensor pulling down a shared reference voltage
- Software that needs an update
- Water damage or a failed module
Can you keep driving?
If the car runs normally, get it checked soon. A reference-voltage or processor code can come with stalling or limp mode — don’t rely on the car for long trips until it’s fixed.
All P26xx codes
| Code | Meaning |
|---|---|
| P2600 | Coolant Pump Control Circuit/Open |
| P2601 | Coolant Pump Control Circuit Range/Performance |
| P2602 | Coolant Pump Control Circuit Low |
| P2603 | Coolant Pump Control Circuit High |
| P2604 | Intake Air Heater "A" Circuit Range/Performance |
| P2605 | Intake Air Heater "A" 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 |
| P260F | Evaporative System Monitoring Processor Performance |
| P2610 | ECM/PCM Internal Engine Off Timer Performance |
| P2611 | A/C Refrigerant Distribution Valve Control Circuit/Open |
| P2612 | A/C Refrigerant Distribution Valve Control Circuit Low |
| P2613 | A/C Refrigerant Distribution Valve Control Circuit High |
| P2614 | Camshaft Position Output Circuit/Open |
| P2615 | Camshaft Position Output Circuit Low |
| P2616 | Camshaft Position Output Circuit High |
| P2617 | Crankshaft Position Output Circuit/Open |
| P2618 | Crankshaft Position Output Circuit Low |
| P2619 | Crankshaft Position Output Circuit High |
| P261A | Coolant Pump "B" Control Circuit/Open |
| P261B | Coolant Pump "B" Control Circuit Range/Performance |
| P261C | Coolant Pump "B" Control Circuit Low |
| P261D | Coolant Pump "B" Control Circuit High |
| P2620 | Throttle Position Output Circuit/Open |
| 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) |
| 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 |
| 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 or 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) |
| P2650 | "B" Rocker Arm Actuator Control Circuit/Open (Bank 1) |
| P2651 | "B" Rocker Arm Actuator System Performance or 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 or 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) |
| P2660 | "B" Rocker Arm Actuator Control Circuit/Open (Bank 2) |
| P2661 | "B" Rocker Arm Actuator System Performance or 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 |
| 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 Degradation |
Read the codes from your own car
Plug an inexpensive Bluetooth LE or Wi-Fi OBD2 adapter into the port under the dashboard, and Brimly on your iPhone reads the stored, pending and permanent codes, explains each one offline and clears them once the fault is fixed. OBD diagnostics are part of Brimly Forever, a one-time purchase.
Requires iOS 18.1 or later. Free to download, with optional in-app purchases.