GMC fault codes
Coverage shown is GM data: 17,703 codes · 2,212 vehicle records · 180 ECU records · 10,756 live-data parameters.
GMC shares fault-code data with GM. Data may not cover GMC-specific systems.
Codes 17,703
| Code | Description | Brands | System |
|---|---|---|---|
| P26C0 | Engine coolant bypass valve 'D' stuck/open | 10 | Powertrain |
| P26C2 | Engine coolant bypass valve 'D' stuck closed | 10 | Powertrain |
| P26C5 | Exhaust flow control valve 'A' control circuit/open | 11 | Powertrain |
| P26C6 | Exhaust flow control valve 'A' control circuit low | 10 | Powertrain |
| P26C7 | Exhaust flow control valve 'A' control circuit high | 10 | Powertrain |
| P26C8 | Chassis control module 1 requested MIL illumination | 10 | Powertrain |
| P26CA | Under status, open load | 13 | Powertrain |
| P26CD | Overload/overtemperature | 14 | Powertrain |
| P26CE | Engine coolant pump overspeed/air in system | 11 | Powertrain |
| P26E2 | Fuel Mode Indicator Lamp Control Circuit Low | 9 | Powertrain |
| P26E3 | Fuel Mode Indicator Lamp Control Circuit High | 9 | Powertrain |
| P26E4 | Starter relay 'B' circuit | 15 | Powertrain |
| P26E5 | Starter relay 'B' circuit low | 18 | Powertrain |
| P26E6 | Starter relay 'B' circuit high | 18 | Powertrain |
| P26E7 | Actuator supply voltage 'D' circuit/open | 14 | Powertrain |
| P26E8 | Actuator supply voltage 'D' circuit low | 11 | Powertrain |
| P26E9 | Actuator supply voltage 'D' circuit high | 10 | Powertrain |
| P26F0 | Starter relay 'A' stuck on | 15 | Powertrain |
| P26FA | Coolant pump 'C' overspeed/air in system | 10 | Powertrain |
| P26FB | EGR Cooler Bypass Control Stuck Closed Bank 1 | 9 | Powertrain |
| P2700 | Transmission Friction Element A Apply Time Range/Performance | 23 | Powertrain |
| P2701 | Transmission Friction Element B Apply Time Range/Performance | 25 | Powertrain |
| P2702 | Transmission Friction Element C Apply Time Range/Performance | 23 | Powertrain |
| P2703 | Transmission Friction Element D Apply Time Range/Performance | 23 | Powertrain |
| P2704 | Transmission Friction Element E Apply Time Range/Performance | 23 | Powertrain |
| P2705 | Transmission Friction Element F Apply Time Range/Performance | 20 | Powertrain |
| P2706 | Shift Solenoid F | 23 | Powertrain |
| P2707 | Linear solenoid valve (SLB1) functional failure - stuck in minimum pressure position | 23 | Powertrain |
| P2708 | Abnormal shifting SLB1 maximum pressure | 21 | Powertrain |
| P2709 | Shift Solenoid F Electrical | 22 | Powertrain |
| P2710 | Shift Solenoid F Intermittent | 21 | Powertrain |
| P2711 | Unexpected Mechanical Gear Disengagement | 29 | Powertrain |
| P2712 | Hydraulic power unit leakage | 24 | Powertrain |
| P2713 | Pressure control solenoid D | 29 | Powertrain |
| P2714 | Pressure Control Solenoid D Performance/Stuck Off | 29 | Powertrain |
| P2715 | Pressure Control Solenoid D Stuck On | 31 | Powertrain |
| P2716 | Pressure control solenoid D electrical | 30 | Powertrain |
| P2717 | Pressure Control Solenoid D Intermittent | 21 | Powertrain |
| P2718 | Pressure Control Solenoid D Control Circuit/Open | 28 | Powertrain |
| P2719 | Pressure Control Solenoid D Control Circuit Range/Performance | 30 | Powertrain |
| P2720 | Pressure Control Solenoid D Control Circuit Low | 33 | Powertrain |
| P2721 | Pressure Control Solenoid D Control Circuit High | 33 | Powertrain |
| P2722 | Pressure control solenoid E | 29 | Powertrain |
| P2723 | Pressure Control Solenoid E Performance/Stuck Off | 27 | Powertrain |
| P2724 | Pressure Control Solenoid E Stuck On | 30 | Powertrain |
| P2725 | Pressure Control Solenoid E Electrical | 27 | Powertrain |
| P2726 | Pressure Control Solenoid E Intermittent | 21 | Powertrain |
| P2727 | Clutch pressure modulation solenoid valve C3 control | 30 | Powertrain |
| P2728 | Pressure Control Solenoid E Control Circuit Range/Performance | 29 | Powertrain |
| P2729 | Pressure Control Solenoid E Control Circuit Low | 33 | Powertrain |
Some brand data is extracted from diagnostic files and may contain manufacturer-specific wording. General SAE J2012 descriptions are used where available.