P26xx OBD-II Codes (P2600–P2699)
100 fault codes in the P26xx range. Click any code for causes, diagnostic steps, severity, and common fixes.
P2600 critical
Coolant Pump Control Circuit Open
P2601 critical
Coolant Pump Control Circuit Range/Performance
P2602 critical
Coolant Pump Control Circuit Low
P2603 moderate
Coolant Pump Control Circuit High
P2604 moderate
Intake Air Heater A Circuit Range/Performance
P2605 moderate
Intake Air Heater "B" Circuit/Open
P2606 moderate
Intake Air Heater "B" Circuit Range/Performance
P2607 moderate
Intake Air Heater "B" Circuit Low
P2608 moderate
Intake Air Heater "B" Circuit High
P2609 moderate
Intake Air Heater B Circuit Low
P2610 low
ECM/PCM Internal Engine Off Timer Performance
P2611 moderate
A/C Refrigerant Distribution Valve Control Circuit Open
P2612 moderate
A/C Refrigerant Distribution Valve Control Circuit Low
P2613 moderate
A/C Refrigerant Distribution Valve Control Circuit High
P2614 critical
Camshaft Position Signal Output Circuit Open
P2615 critical
Camshaft Position Signal Output Circuit Low
P2616 critical
Camshaft Position Signal Output Circuit High
P2617 critical
Crankshaft Position Signal Output Circuit Open
P2618 critical
Crankshaft Position Signal Output Circuit Low
P2619 critical
Crankshaft Position Signal Output Circuit High
P2620 moderate
Throttle Position Output Circuit
P2621 moderate
Throttle Position Output Circuit Low
P2622 moderate
Throttle Position Output Circuit High
P2623 critical
Injector Control Pressure Regulator Circuit Open
P2624 critical
Injector Control Pressure Regulator Circuit Low
P2625 critical
Injector Control Pressure Regulator Circuit High
P2626 moderate
O2 Sensor Pumping Current Trim Circuit Open Bank 1 Sensor 1
P2627 moderate
O2 Sensor Pumping Current Trim Circuit Low Bank 1 Sensor 1
P2628 moderate
O2 Sensor Pumping Current Trim Circuit High Bank 1 Sensor 1
P2629 moderate
O2 Sensor Pumping Current Trim Circuit Open Bank 2 Sensor 1
P2630 moderate
O2 Sensor Pumping Current Trim Circuit Low Bank 2 Sensor 1
P2631 moderate
O2 Sensor Pumping Current Trim Circuit High Bank 2 Sensor 1
P2632 critical
Fuel Pump B Control Circuit Open
P2633 critical
Fuel Pump B Control Circuit Low
P2634 moderate
Fuel Pump B Control Circuit High
P2635 critical
Fuel Pump A Low Flow/Performance
P2636 critical
Fuel Pump B Low Flow/Performance
P2637 moderate
Torque Management Feedback Signal A
P2638 moderate
Torque Management Feedback Signal A Range/Performance
P2639 moderate
Torque Management Feedback Signal A Low
P2640 moderate
Torque Management Feedback Signal A High
P2641 moderate
Torque Management Feedback Signal B Range/Performance
P2642 moderate
Torque Management Feedback Signal "B" Range/Performance
P2643 moderate
Torque Management Feedback Signal "B" Low
P2644 moderate
Torque Management Feedback Signal "B" High
P2645 critical
Turbocharger/Supercharger Boost Pressure A Actuator Stuck Closed
P2646 moderate
Rocker Arm Actuator A Control Circuit Low Bank 1
P2647 moderate
Rocker Arm Actuator A Control Circuit High Bank 1
P2648 moderate
Rocker Arm Actuator B Control Circuit Low Bank 1
P2649 moderate
Rocker Arm Actuator B Control Circuit High Bank 1
P2650 moderate
"B" Rocker Arm Actuator Control Circuit/Open Bank 1
P2651 serious
"B" Rocker Arm Actuator System Performance/Stuck Off Bank 1
P2652 serious
"B" Rocker Arm Actuator System Stuck On Bank 1
P2653 moderate
"B" Rocker Arm Actuator Control Circuit Low Bank 1
P2654 moderate
"B" Rocker Arm Actuator Control Circuit High Bank 1
P2655 moderate
"A" Rocker Arm Actuator Control Circuit/Open Bank 2
P2656 serious
"A" Rocker Arm Actuator System Performance/Stuck Off Bank 2
P2657 serious
"A" Rocker Arm Actuator System Stuck On Bank 2
P2658 moderate
"A" Rocker Arm Actuator Control Circuit Low Bank 2
P2659 moderate
"A" Rocker Arm Actuator Control Circuit High Bank 2
P2660 moderate
"B" Rocker Arm Actuator Control Circuit/Open Bank 2
P2661 serious
"B" Rocker Arm Actuator System Performance/Stuck Off Bank 2
P2662 serious
"B" Rocker Arm Actuator System Stuck On Bank 2
P2663 moderate
"B" Rocker Arm Actuator Control Circuit Low Bank 2
P2664 moderate
"B" Rocker Arm Actuator Control Circuit High Bank 2
P2665 moderate
Fuel Shutoff Valve "B" Control Circuit/Open
P2666 moderate
Fuel Shutoff Valve "B" Control Circuit Low
P2667 moderate
Fuel Shutoff Valve "B" Control Circuit High
P2668 moderate
Fuel Mode Indicator Lamp Control Circuit
P2669 moderate
Actuator Supply Voltage "B" Circuit/Open
P2670 moderate
Actuator Supply Voltage "B" Circuit Low
P2671 moderate
Actuator Supply Voltage "B" Circuit High
P2672 moderate
Injection Pump Timing Offset
P2673 moderate
Injection Pump Timing Calibration Not Learned
P2674 moderate
Injection Pump Fuel Calibration Not Learned
P2675 moderate
Air Cleaner Inlet Control Circuit/Open
P2676 moderate
Air Cleaner Inlet Control Circuit Low
P2677 moderate
Air Cleaner Inlet Control Circuit High
P2678 moderate
Coolant Degassing Valve Control Circuit/Open
P2679 moderate
Coolant Degassing Valve Control Circuit Low
P2680 moderate
Coolant Degassing Valve Control Circuit High
P2681 moderate
Engine Coolant Bypass Valve Control Circuit/Open
P2682 moderate
Engine Coolant Bypass Valve Control Circuit Low
P2683 moderate
Engine Coolant Bypass Valve Control Circuit High
P2684 moderate
Actuator Supply Voltage "C" Circuit/Open
P2685 moderate
Actuator Supply Voltage "C" Circuit Low
P2686 moderate
Actuator Supply Voltage "C" Circuit High
P2687 moderate
Fuel Supply Heater Control Circuit/Open
P2688 moderate
Fuel Supply Heater Control Circuit Low
P2689 moderate
Fuel Supply Heater Control Circuit High
P2690 moderate
Cylinder 5 Injector Data Incompatible
P2691 moderate
Cylinder 6 Injector Data Incompatible
P2692 moderate
Cylinder 7 Injector Data Incompatible
P2693 moderate
Cylinder 8 Injector Data Incompatible
P2694 moderate
Cylinder 9 Injector Data Incompatible
P2695 moderate
Cylinder 10 Injector Data Incompatible
P2696 moderate
Injector Data Incompatible
P2697 moderate
Exhaust Aftertreatment Fuel Injector "A" Circuit/Open
P2698 moderate
Exhaust Aftertreatment Fuel Injector "A" Performance
P2699 moderate
Exhaust Gas Recirculation Cooler Bypass Control Circuit