Safety Warning
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 MANUALSCHEVROLET2001CAB & CHASSIS SILVERADO 2D PICKUP, 8.1 G, 4WD, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)QUICK LOOKUPSDTC INDEXENGINE CONTROLS - 6.6L - DIAGNOSTIC TROUBLE CODES
2001 Chevrolet Cab & Chassis Silverado 2D Pickup, 8.1 G, 4WD, Automatic
Engine Controls - 6.6L - Diagnostic Trouble Codes
2001 Chevrolet Cab & Chassis Silverado 2D Pickup, 8.1 G, 4WD, AutomaticSECTION Engine Controls - 6.6L - Diagnostic Trouble Codes
ENGINE CONTROLS - 6.6L - DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description |
|---|---|
| DTC P0087 | Fuel Rail Pressure Low |
| DTC P0088 | Fuel Rail Pressure High |
| DTC P0089 | Fuel Rail Pressure Malfunction |
| DTC P0090 | Fuel Rail Pressure Regulator Circuit Malfunction |
| DTC P0093 | Fuel Pressure Malfunction |
| DTC P0094 | Fuel Injection Pump Flow High |
| DTC P0101 | MAF Sensor Voltage Malfunction |
| DTC P0102 | MAF Sensor Voltage Low |
| DTC P0103 | MAF Sensor Voltage High |
| DTC P0106 | Difference Between BARO Sensor and Boost Sensor is High |
| DTC P0107 | Barometric Pressure Low |
| DTC P0108 | Barometric Pressure High |
| DTC P0112 | Intake Air Temperature High |
| DTC P0113 | Intake Air Temperature Low |
| DTC P0117 | ECT Sensor Temperature High |
| DTC P0118 | ECT Sensor Temperature Low |
| DTC P0128 | Engine Coolant Temperature Low |
| DTC P0168 | Fuel Temperature Sensor High |
| DTC P0181 | FT and IAT More Than 10°C (18°F) of Each Other at Start-Up |
| DTC P0182 | Fuel Temperature Sensor High/Fuel Temp Sensor Voltage Low |
| DTC P0183 | Fuel Temperature Sensor Low |
| DTC P0192 | ECM Signal Circuit Low |
| DTC P0193 | ECM Signal Circuit High |
| DTC P0201, P0202, P0203, P0204, P0205, P0206, P0207, or P0208 | FICM Detects Incorrect Current On a Fuel Injector Circuit |
| DTC P0234 | Boost Pressure Sensor Signal High |
| DTC P0236 | Boost Pressure Sensor Signal Low |
| DTC P0237 | Boost Pressure Low |
| DTC P0238 | Boost Pressure High |
| DTC P0300 | Fuel Rate Adjustment High |
| DTC P0301-P0308 | Fuel Rate Adjustment High |
| DTC P0335 | No Signal From CKP Sensor |
| DTC P0336 | CKP Sensor Signal Out Of Range |
| DTC P0340 | No Signal From CMP Sensor |
| DTC P0370 or P0374 | FICM Receiving Invalid Crank Signal |
| DTC P0380 (California and RPO NF4, VCL) | Glow Plug Malfunction |
| DTC P0380 (Federal RPO FE9, NG1) | Glow Plug Malfunction |
| DTC P0540 | Heater Line Voltage Malfunction |
| DTC P0543 | IAH Line Voltage Malfunction |
| DTC P0601, P0602, P0603, P0604, P0605, P0606, P0607, P1600, P1621, P1627, P1680, P1681, P1683, or P2610 | Control Module Malfunction |
| DTC P0611 | FICM Detects Internal Circuit Fault |
| DTC P0612 | Feedback Voltage Does Not Match Output State |
| DTC P0650 | Commanded State Of Driver and Actual State of Control Circuit Do Not Match |
| DTC P0700 | MIL Request Circuit Shorted To Ground |
| DTC P1125 | ECM Detects a Condition with More than one APP Sensor |
| DTC P1172 | Primary and Secondary Fuel Level Sensor Malfunction |
| DTC P1223, P1226, P1229, P1232, P1235, P1238, P1241, or P1244 | Command State and Actual State of the Control Circuit Does Not Match |
| DTC P1261 | Cylinders 1,4,6 and 7 High Voltage Circuit Fault |
| DTC P1262 | Cylinders 2,3,5 and 8 High Voltage Circuit Fault |
| DTC P1270 | ECM Microprocessor Malfunction |
| DTC P1271 | APP Sensor Malfunction |
| DTC P1272 | APP Sensor Malfunction |
| DTC P1273 | APP Sensor Malfunction |
| DTC P1277 | APP Sensor 1 Voltage Low |
| DTC P1278 | APP Sensor 1 Voltage High |
| DTC P1282 | APP Sensor 2 Voltage Low |
| DTC P1283 | APP Sensor 2 Voltage High |
| DTC P1287 | APP Sensor 3 Voltage Low |
| DTC P1288 | APP Sensor 3 Voltage High |
| DTC P1345 | Cam Sensor Malfunction |
| DTC P1550 | FICM Detects Low Supply Voltage |
| DTC P1635 | The ECM Detects a Voltage Out of Tolerance Condition On the 5-Volt Reference A Circuit |
| DTC P1639 | The ECM Detects a Voltage Out of Tolerance Condition On the 5-Volt Reference 2 Circuit |
| DTC P1643 | Wait To Start Indicator Circuit Voltage Malfunction |
| DTC P1658 | The FICM Detects Current Through an Internal Driver When the Driver is OFF |
| DTC P1781 | Improper Voltage Level on the TCM MIL Request Circuit |
| DTC U1800 | The CAN Message from the FICM is Not Received by the ECM for 45 Milliseconds |
| DTC U2104 | The CAN Message from the FICM and TCM are Not Received by the ECM for 45 Milliseconds |
| DTC U2106 | The CAN Message from the TCM is Not Received by the ECM for 45 Milliseconds |
RENDER: 1.0x
NO RELATED
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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.