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DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1812 (ANTILOCK BRAKE SYSTEM - HYBRID (HP2) WITH TRACTION CONTROL SYSTEM & STABILITY CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDIAGNOSTIC CODE INDEX
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2
Diagnostic Code Index
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Diagnostic Code Index
WARNING: This page is about a different car, the 2010 GMC Sierra and 2010 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC CODE INDEX
| DTC | Description |
|---|---|
| DTC C0035-C0050, C1207-C1210, C1221-C1228, or C1232-C1235 | C0035 04: Left Front Wheel Speed Sensor Circuit Open Circuit C1232 00: Left Front Wheel Speed Sensor Circuit Low Input C0035 26: Left Front Wheel Speed Sensor Circuit Frequency too Low C1221 00: Left Front Wheel Speed Sensor Circuit Malfunction C0035 27: Left Front Wheel Speed Sensor Circuit Frequency too High C1225 00: Left Front Wheel Speed Sensor Circuit Performance C0035 0E: Left Front Wheel Speed Sensor Circuit Resistance Below Threshold C1207 00: Left Front Wheel Speed Sensor Circuit High Input C0035 1F: Left Front Wheel Speed Sensor Circuit Intermittent C1221 00: Left Front Wheel Speed Sensor Circuit Malfunction C0040 04: Right Front Wheel Speed Sensor Circuit Open Circuit C1233 00: Right Front Wheel Speed Sensor Circuit Low Input C0040 0E: Right Front Wheel Speed Sensor Circuit Resistance Below Threshold C1208 00: Right Front Wheel Speed Sensor Circuit High Input C0040 1F: Right Front Wheel Speed Sensor Circuit Intermittent C1222 00: Right Front Wheel Speed Sensor Circuit Malfunction C0040 26: Right Front Wheel Speed Sensor Circuit Frequency too Low C1222 00: Right Front Wheel Speed Sensor Circuit Malfunction C0040 27: Right Front Wheel Speed Sensor Circuit Frequency too High C1226 00: Right Front Wheel Speed Sensor Circuit Performance C0045 04: Left Rear Wheel Speed Sensor Circuit Open Circuit C1234 00: Left Rear Wheel Speed Sensor Circuit Low Input C0045 0E: Left Rear Wheel Speed Sensor Circuit Resistance Below Threshold C1209 00: Left Rear Wheel Speed Sensor Circuit High Input C0045 1F: Left Rear Wheel Speed Sensor Circuit Intermittent C1223 00: Left Rear Wheel Speed Sensor Circuit Malfunction C0045 26: Left Rear Wheel Speed Sensor Circuit Frequency too Low C1223 00: Left Rear Wheel Speed Sensor Circuit Malfunction C0045 27: Left Rear Wheel Speed Sensor Circuit Frequency too High C1227 00: Left Rear Wheel Speed Sensor Circuit Performance C0050 04: Right Rear Wheel Speed Sensor Circuit Open Circuit C1235 00: Right Rear Wheel Speed Sensor Circuit Low Input C0050 0E: Right Rear Wheel Speed Sensor Circuit Resistance Below Threshold C1210 00: Right Rear Wheel Speed Sensor Circuit High Input C0050 1F: Right Rear Wheel Speed Sensor Circuit Intermittent C1224 00: Right Rear Wheel Speed Sensor Circuit Malfunction C0050 26: Right Rear Wheel Speed Sensor Circuit Frequency too Low C1224 00: Right Rear Wheel Speed Sensor Circuit Malfunction C0050 27: Right Rear Wheel Speed Sensor Circuit Frequency too High C1228 00: Right Rear Wheel Speed Sensor Circuit Performance |
| DTC C005A | C005A 00: Simultaneous Dropout of Both Wheel Speed Sensors on One Axle |
| DTC C0110, C12E0, C12E8, or C12E9 | C0110 00: Pump Motor Circuit C0110 61: Pump Motor Circuit Actuator Stuck C12E0 00: ABS Pump Motor Performance C12E8 00: ABS Pump Motor Stuck C12E9 00: ABS Pump Motor Stuck On |
| DTC C012A, C128B, C128E, or C12B2-C12B4 | C012A 00: Master Cylinder Pressure Sensor C128E: Master Cylinder Pressure Sensor C012A 01: Master Cylinder Pressure Sensor Short to Battery C12B3: Master Cylinder Pressure Sensor Short to Battery C012A 06: Master Cylinder Pressure Sensor Short to Ground or Open C12B2: Master Cylinder Pressure Sensor Short to Ground or Open C012A 11: Master Cylinder Pressure Sensor Above Maximum Threshold C128B: Master Cylinder Pressure Sensor Above Maximum Threshold C012A 0F: Master Cylinder Pressure Sensor Erratic C12B4: Master Cylinder Pressure Sensor Erratic |
| DTC C012B or C12B6-C12B8 | C012B 01: High Pressure Accumulator Pressure Sensor Short to Battery C12B7: High Pressure Accumulator Pressure Sensor Short to Battery C012B 06: High Pressure Accumulator Pressure Sensor Short to Ground or Open C12B6: High Pressure Accumulator Pressure Sensor Short to Ground or Open C012B 0F: High Pressure Accumulator Pressure Sensor Erratic C12B8: High Pressure Accumulator Pressure Sensor Erratic |
| DTC C012C, C121A, C128C, C128F, C12B9, C12BA, C12BB, or C12F7 | C12F7: ABS Boost Pressure Sensor and Regenerative Axle Pressure Sensor Not Plausible C128F: ABS Regenerative Axle Pressure Sensor Raw Offset Error C012C 01: Regenerative Axle Pressure Sensor Short to Battery C12BA: ABS Regenerative Axle Pressure Sensor Circuit Short To Battery C012C 06: Regenerative Axle Pressure Sensor Short to Ground or Open C12B9: ABS Regenerative Axle Pressure Sensor Circuit Open or Short To Ground C012C 11: Regenerative Axle Pressure Sensor Above Maximum Threshold C128C: ABS Regenerative Axle Pressure Sensor Offset Error C012C 0F: Regenerative Axle Pressure Sensor Erratic C12BB: ABS Regenerative Axle Pressure Sensor Erratic C121A: ABS Regenerative Axle Pressure Sensor |
| DTC C012D, C120A, C128A, C128D, C12BC, C12BD, or C12BE | C012D 00: Brake Boost Regulation Pressure Sensor C128D: Brake Boost Regulation Pressure Sensor C012D 01: Brake Boost Regulation Pressure Sensor Short to Battery C12BD: Brake Boost Regulation Pressure Sensor Short to Battery C012D 06: Brake Boost Regulation Pressure Sensor Short to Ground or Open C12BC: Brake Boost Regulation Pressure Sensor Short to Ground or Open C012D 11: Brake Boost Regulation Pressure Sensor Above Maximum Threshold C128A: Brake Boost Regulation Pressure Sensor Above Maximum Threshold C012D 5A: Brake Boost Regulation Pressure Sensor Plausibility Failure C120A: Brake Boost Regulation Pressure Sensor Plausibility Failure C012D 0F: Brake Boost Regulation Pressure Sensor Erratic C12BE: Brake Boost Regulation Pressure Sensor Erratic |
| DTC C012E or C12FE | C012E 00: Hydraulic Brake Boost Pressure Loss C12FE 00: ABS Pump Pressure Loss |
| DTC C012F, C12A7, C12DC, or C12DD | C012F 00: Brake Boost Solenoid Valve Circuit C012F 0E: Brake Boost Solenoid Valve Circuit Shorted C12A7: Brake Boost Solenoid Valve Circuit Performance C12DC: Brake Boost Solenoid Valve Circuit Malfunction C12DD: Brake Boost Solenoid Valve Circuit Shorted |
| DTC C0161 or C127D | C0161 00: Antilock Brake System (ABS) Brake Switch Circuit C127D: Antilock Brake System (ABS) Brake Switch Circuit C0161 04: Antilock Brake System (ABS) Brake Switch Circuit Open Circuit C0161 0E: Antilock Brake System (ABS) Brake Switch Circuit Resistance Below Threshold |
| DTC C0186 or C0196 | C0186 00: Lateral Accelerometer Circuit C0186 09: Lateral Accelerometer Rate of Change Above Threshold C0186 11: Lateral Accelerometer Circuit Above Maximum Threshold C0186 18: Lateral Accelerometer Circuit Signal Amplitude Less Than Minimum C0186 0A: Lateral Accelerometer Circuit Rate of Change Below Threshold C0186 4B: Lateral Accelerometer Circuit Calibration Not Learned C0196 00: Yaw Rate Circuit C0196 0A: Yaw Rate Circuit Rate of Change Below Threshold C0196 09: Yaw Rate Circuit Rate of Change Above Threshold C0196 11: Yaw Rate Circuit Above Maximum Threshold C0196 18: Yaw Rate Circuit Signal Amplitude Less Than Minimum |
| DTC C0201, C120D, or C120E | C0201 04: Antilock Brake System (ABS) Enable Relay Contact Circuit Open C120D: Traction Control Power Switch Circuit Open C0201 0E: Antilock Brake System (ABS) Enable Relay Contact Circuit Resistance Below Threshold C120E: Traction Control Power Switch Circuit Shorted |
| DTC C0242 or P0856 | C0242 00: Powertrain Control Module Indicated Traction Control Malfunction P0856: Engine Control Module (ECM) Traction Control Torque Request Circuit |
| DTC C0245, C122E | C0245 00: Wheel Speed Sensor Frequency Error C122E: Wheel Speed Sensor Frequency Error |
| DTC C0252 | C0252 00: VSES Sensor Uncorrelated |
| DTC C0256, C12E6, or C12E7 | C0256 04: Valve Relay Contact Circuit Open C12E6: Valve Relay Contact Circuit Open C0256 0E: Valve Relay Contact Circuit Resistance Below Threshold C12E7: Valve Relay Contact Circuit Resistance Below Threshold |
| DTC C0277, C120C, C129A, C129B, C129D, C129E, C12B1, or C12F8 | C0277 03: BMC Primary Piston Position Sensor A and B Circuit Performance Voltage Below Threshold C129A: Brake Pedal Position Sensor 3 Circuit Low C129D: Brake Pedal Position Sensor 4 Circuit Low C0277 07: BMC Primary Piston Position Sensor A and B Circuit Voltage Above Threshold C129B: Brake Pedal Position Sensor 3 Circuit High C129E: Brake Pedal Position Sensor 4 Circuit High C0277 5A: BMC Primary Piston Position Sensor A and B Circuit Plausibility Failure C12B1: ABS Master Cylinder Pressure Sensor and Brake Pedal Position Sensor Not Plausible C12F8: Brake Pedal Position Sensor 3 Not Plausible C120C: Brake Pedal Position Sensor 4 Not Plausible |
| DTC C0278, C129C, or C129F | C0278 00: BMC Primary Piston Position Sensor Not Calibrated C129C 00: Brake Pedal Position Sensor 3 Circuit Calibration C129F 00: Brake Pedal Position Sensor 4 Circuit Calibration |
| DTC C0294, C120C, or C12F8 | C0294 00: BMC Primary Piston Position Sensor A and B Correlation C120C: Brake Pedal Position Sensor 4 Plausibility C12F8: Brake Pedal Position Sensor 3 Plausibility |
| DTC C0299 or C12FF | C0299 00: Brake Booster Performance C12FF 00: EBCM Internal Malfunction C0299 31: Brake Booster Performance General Checksum Failure |
| DTC C0455 | C0455 09: Front Steering Position Sensor Circuit Rate of Change Above Threshold C0455 19: Front Steering Position Sensor Circuit Signal Amplitude Greater Than Maximum C0455 39: Front Steering Position Sensor Circuit Internal Electronic Failure C0455 5A: Front Steering Position Sensor Circuit Plausibility Failure |
| DTC C0552 or C121D | C0552 00: Improper Shutdown C121D: Improper Shutdown |
| DTC C0561 | C0561 4B: System Disabled Information Stored Calibration Not Learned C0561 54: System Disabled Information Stored Temperature High - Solenoid Over Temperature C0561 59: System Disabled Information Stored Component Protection Time Out - Pump Motor Run On C0561 71: System Disabled Information Stored Invalid Serial Data Received C0561 72: System Disabled Information Stored Alive Counter Incorrect C0561 74: System Disabled Information Stored Value of Signal Protection Calculation Incorrect C0561 75: System Disabled Information Stored Signal Above Allowable Range |
| DTC C056D, C121C, C121E, C121F, C123A-C1256, C126E-C127C, C12C2-C12DB, C12DE, C12DF, or C12F2-C12F6 | C056D 00: ECU Hardware Performance C056D 3C: ECU Hardware Performance Internal Communications Failure C056D 59: ECU Hardware Performance C121C: EBCM Internal Communication Error C121E: EBCM Malfunction C121F: EBCM Unexpected Exception C123A: EBCM High End Timer Watchdog C123B: EBCM High End Timer Program Overflow C123C: EBCM High End Timer RAM Fault C123D: EBCM Solenoid Timeout C123E: EBCM High End Timer Periodic Interrupt C123F: EBCM Serial Peripheral Interface Inoperative C1255: Electronic Control Unit Performance C1256: Program ROM Checksum Error C126E: EBCM Stack Overrun C126F: EBCM Serial Peripheral Interface Performance C127C: EBCM Self Test Failed C127E: EBCM Module High Temperature C12C2: ABS Left Front Isolation Solenoid Valve Driver Shorted C12C5: ABS Right Front Isolation Solenoid Valve Diver Shorted C12C6: ABS Left Rear Isolation Solenoid Valve Circuit Failure C12C8: ABS Right Rear Isolation Solenoid Valve Circuit Failure C12CC: ABS Left Front Dump Solenoid Valve Driver Shorted C12CF: ABS Right Front Dump Solenoid Valve Driver Shorted C12D0: ABS Left Rear Dump Solenoid valve Circuit Open C12D1: ABS Left Rear Dump Solenoid Valve Circuit Shorted C12D2: ABS Left Rear Dump Solenoid Valve Driver Shorted C12D3: ABS Right Rear Dump Solenoid Valve Circuit Open C12D4: ABS Right Rear Dump Solenoid Valve Circuit Shorted C12D5: ABS Right Rear Dump Solenoid Driver Shorted C12D6: ABS Base Brake Open Solenoid Circuit Open C12D7: ABS Base Brake Open Solenoid Circuit Shorted C12D8: ABS Base Brake Open Solenoid Driver Shorted C12D9: ABS Base Brake Closed Solenoid Circuit Open C12DA: ABS Base Brake Closed Solenoid Circuit Shorted C12DB: ABS Base Brake Closed Solenoid Driver Shorted C12DE: ABS Proportioning Valve Solenoid Circuit Open C12DF: ABS Proportioning Valve Solenoid Driver Shorted C12F2: ABS Left Rear Isolation Solenoid Valve Circuit Shorted C12F3: ABS Left Rear Isolation Solenoid Circuit Performance C12F4: ABS Proportioning Valve Solenoid Performance C12F5: ABS Right Rear Isolation Solenoid Circuit Shorted C12F6: ABS Right Rear Isolation Solenoid Performance |
| DTC C056E | C056E 42: ECU Software Performance Calibration Data Set Not Programmed |
| DTC C0574 | C0574 08: Circuit Board Temperature Sensor Signal Invalid C0574 11: Circuit Board Temperature Sensor Above Maximum Threshold |
| DTC C0870 or C12E4 | C0870 00: Device Voltage Reference Output Circuit C12E4: Device Voltage Reference Output Circuit |
| DTC C0880, C12E5, or C120F | C0880 00: Device Voltage Reference Output Circuit C12E5 00: Brake Pedal Position Sensor Reference Circuit C0880 02: Device Voltage Reference Output Circuit Short to Ground C120F 00: Device Voltage Reference Output Circuit Short to Ground |
| DTC C0898 | C0898 00: Controlled Shutdown Failure |
| DTC C0914 | C0914 06: Device Voltage Output 1 Circuit Short to Ground or Open |
| DTC C1120 or C1121 | C1120 00: Left Front Brake Hydraulic Circuit Blocked C1121 00: Left Front Brake Hydraulic Circuit Leaking |
| DTC C1122 or C1123 | C1122 00: Right Front Brake Hydraulic Circuit Blocked C1123 00: Right Front Brake Hydraulic Circuit Leaking |
| DTC C1124-C1126 | C1124 00: Base Brake Hydraulic Circuit Normally Open Valve C1125 00: Hydraulic Circuit Test Duration Excessive C1126 00: Base Brake Proportioning Valve Hydraulic Circuit Blocked |
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.