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 A Circuit Low
P2606 moderate
Intake Air Heater A Circuit High
P2607 low
Intake Air Heater A Circuit Intermittent
P2608 moderate
Intake Air Heater B Circuit Range/Performance
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 Low
P2643 moderate
Torque Management Feedback Signal B High
P2644 critical
Turbocharger/Supercharger Boost Pressure A Actuator Stuck Open
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
Rocker Arm Actuator A Control Circuit Low Bank 2
P2651 serious
Cylinder 1 Injector Circuit Open - Bank 2
P2652 serious
Cylinder 2 Injector Circuit Open - Bank 2
P2653 serious
Cylinder 3 Injector Circuit Open - Bank 2
P2654 serious
Cylinder 4 Injector Circuit Open - Bank 2
P2655 moderate
Injector A Fuel Balance Deviation - Bank 2
P2656 moderate
Injector B Fuel Balance Deviation - Bank 2
P2657 moderate
Injector C Fuel Balance Deviation - Bank 2
P2658 moderate
Injector D Fuel Balance Deviation - Bank 2
P2659 moderate
Injector E Fuel Balance Deviation - Bank 2
P2660 moderate
Cylinder 1 Deactivation Solenoid Control Circuit Open
P2661 moderate
Cylinder 2 Deactivation Solenoid Control Circuit Open
P2662 moderate
Cylinder 3 Deactivation Solenoid Control Circuit Open
P2663 moderate
Cylinder 4 Deactivation Solenoid Control Circuit Open
P2664 moderate
Cylinder 5 Deactivation Solenoid Control Circuit Open
P2665 moderate
Cylinder 6 Deactivation Solenoid Control Circuit Open
P2666 moderate
Cylinder 7 Deactivation Solenoid Control Circuit Open
P2667 moderate
Cylinder 8 Deactivation Solenoid Control Circuit Open
P2668 moderate
Cylinder Deactivation System Slow Response
P2669 serious
Cylinder Deactivation System Stuck
P2670 serious
Actuator Supply Voltage 'A' Circuit Open
P2671 serious
Actuator Supply Voltage 'A' Circuit Low
P2672 moderate
Actuator Supply Voltage 'A' Circuit High
P2673 serious
Actuator Supply Voltage 'B' Circuit Open
P2674 serious
Actuator Supply Voltage 'B' Circuit Low
P2675 moderate
Actuator Supply Voltage 'B' Circuit High
P2676 serious
Actuator Supply Voltage 'C' Circuit Open
P2677 serious
Actuator Supply Voltage 'C' Circuit Low
P2678 moderate
Actuator Supply Voltage 'C' Circuit High
P2679 serious
Actuator Supply Voltage 'D' Circuit Low
P2680 serious
Glow Plug Control Module Circuit Open
P2681 serious
Glow Plug Control Module Circuit Low
P2682 moderate
Glow Plug Control Module Circuit High
P2683 moderate
Glow Plug 1 Circuit Open
P2684 moderate
Glow Plug 2 Circuit Open
P2685 moderate
Glow Plug 3 Circuit Open
P2686 moderate
Glow Plug 4 Circuit Open
P2687 moderate
Glow Plug 5 Circuit Open
P2688 moderate
Glow Plug 6 Circuit Open
P2689 moderate
Glow Plug 7 Circuit Open
P2690 moderate
Exhaust Pressure Sensor Circuit
P2691 moderate
Exhaust Pressure Sensor Circuit Range/Performance
P2692 serious
Exhaust Pressure Sensor Circuit Low
P2693 moderate
Exhaust Pressure Sensor Circuit High
P2694 serious
Exhaust Pressure Regulator Circuit Open
P2695 serious
Exhaust Pressure Regulator Circuit Low
P2696 serious
Exhaust Pressure Regulator Circuit High
P2697 serious
DPF Pressure Too Low
P2698 serious
DPF Pressure Too High
P2699 moderate
Exhaust Gas Recirculation Cooler Bypass Control Circuit
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