GM Service Manual Online
For 1990-2009 cars only
Makes
🢒
GMC_Truck
🢒
1998
🢒
GMC C Pickup - 2WD (CNG)
🢒 DTC
Diagnostic Trouble Codes
Diagnostic Trouble Codes
DTC 12 Diagnostic System Ready
DTC 13 Function Readiness
DTC 14 ECT Sensor Circuit High Voltage
DTC 15 ECT Sensor Circuit Low Voltage
DTC 16 ECT Excessive Time to Closed Loop
DTC 21 TP Sensor Circuit High
DTC 22 TP Sensor Circuit Low
DTC 23 IAT Sensor Circuit Low Voltage
DTC 25 IAT Sensor Circuit High Voltage
DTC 26 TP Sensor Performance
DTC 27 Quad Driver Output
DTC 32 MAP Sensor Performance
DTC 33 MAP Sensor Circuit High Voltage
DTC 34 MAP Sensor Circuit Low Voltage
DTC 35 MAF System Performance
DTC 36 MAF Sensor Circuit Low Voltage
DTC 37 MAF Sensor Circuit High Voltage
DTC 41 CKP Sensor Circuit
DTC 42 HO2S Insufficient Activity Bank 1 Sensor 1
DTC 43 HO2S Heater Circuit Bank 1 Sensor 1
DTC 44 HO2S Circuit Low Voltage Bank 1 Sensor 1
DTC 45 HO2S Circuit High Voltage Bank 1 Sensor 1
DTC 51 Gas Mass Sensor Circuit Low Frequency
DTC 52 Gas Mass Sensor Circuit High Frequency
DTC 53 Gas Mass Sensor Circuit Range Performance
DTC 55 Fuel Trim System Lean
DTC 56 Fuel Trim System Rich
DTC 58 AF ECU Failure
DTC 62 HO2S Heater Circuit Bank 2 Sensor 1
DTC 63 HO2S Insufficient Activity Bank 2 Sensor 1
DTC 64 HO2S Circuit Low Voltage Bank 2 Sensor 1
DTC 65 HO2S Circuit High Voltage Bank 2 Sensor 1
DTC 66 Fuel Pressure Sensor Circuit Low Voltage
DTC 67 Fuel Pressure Sensor Circuit High Voltage