GM Service Manual Online
For 1990-2009 cars only

This information refers to domestic and Export calibration packages. Export vehicles may have differences in DTC types that will affect Malfunction Indicator Lamp (MIL) operation. Certain DTCs have been changed from type A to type C or, in some cases, type X. When a type A diagnostic fails, a DTC is set immediately and the Malfunction Indicator Lamp (MIL) is illuminated. When a type B DTC diagnostic fails, the Malfunction Indicator Lamp (MIL) will illuminate if the fault is present after two consecutive drive trips. A type C DTC will set after one failure and be stored in history but will not illuminate the Malfunction Indicator Lamp (MIL). Type X DTCs have been turned off (the diagnostic does not run, no codes are stored, and the Malfunction Indicator Lamp (MIL) will not illuminate.

If a system is malfunctioning and the associated DTC has been disabled (Type X), it may be beneficial to use the diagnostic table as a guide to aid in diagnosis. Many of the DTC tables include a functional check of the system that may pinpoint a problem. However, it is important to remember that the DTC tables are specifically designed for use only when a DTC is set. Therefore, a thorough understanding of the normal operation of the system being diagnosed is necessary and use of the tables for this purpose is at the discretion of the technician.

Diagnostic Trouble Code (DTC) Type Table

DTC

Description

Domestic

Export Unleaded Fuel

Export Leaded Fuel

P0102

Mass Air Flow (MAF) Sensor Circuit Low Frequency

B

--

--

P0103

Mass Air Flow (MAF) Sensor Circuit High Frequency

B

--

--

P0107

Manifold Absolute Pressure (MAP) Sensor Circuit Low Voltage

B

--

--

P0108

Manifold Absolute Pressure (MAP) Sensor Circuit High Voltage

B

--

--

P0112

Intake Air Temperature (IAT) Sensor Circuit Low Voltage

B

--

--

P0113

Intake Air Temperature (IAT) Sensor Circuit High Voltage

B

--

--

P0117

Engine Coolant Temperature (ECT) Sensor Low Voltage

B

--

--

P0118

Engine Coolant Temperature (ECT) Sensor High Voltage

B

--

--

P0131

Heated Oxygen Sensor (HO2S) Circuit Low Voltage Bank 1 Sensor 1

B

--

--

P0132

Heated Oxygen Sensor (HO2S) Circuit High Voltage Bank 1 Sensor 1

B

--

--

P0134

Heated Oxygen Sensor (HO2S) Circuit Insufficient Activity Bank 1 Sensor 1

B

--

--

P0151

Heated Oxygen Sensor (HO2S) Circuit Low Voltage Bank 2 Sensor 1

B

--

--

P0152

Heated Oxygen Sensor (HO2S) Circuit High Voltage Bank 2 Sensor 1

B

--

--

P0154

Heated Oxygen Sensor (HO2S) Circuit Insufficient Activity Bank 2 Sensor 1

B

--

--

P0335

CKP Sensor Circuit

B

--

--

P0336

CKP Sensor Circuit Performance

B

--

--

P0341

CMP Circuit Performance

B

--

--

P0342

CMP Sensor Circuit Low Voltage

B

--

--

P0343

CMP Sensor Circuit High Voltage

B

--

--

P0404

EGR Valve Open Pintle Position

B

--

--

P0405

EGR Valve Position Sensor Circuit Low Voltage

B

--

--

P0500

Vehicle Speed Sensor Circuit

B

--

--

P0506

Idle Speed Low

B

--

--

P0507

Idle Speed High

B

--

--

P0522

Engine Oil Pressure sensor Low

C

--

--

P0523

Engine Oil Pressure sensor High

C

--

--

P0601

PCM Memory

A

--

--

P0604

Control Module Random Access Memory

A

--

--

P0606

PCM Internal Communication Interrupted

A

--

--

P0656

Engine Oil Pressure Gauge Output Circuit

C

--

--

P0704

Clutch Switch Circuit

C

--

--

P1107

MAP Sensor Circuit Intermittent Low Voltage

C

--

--

P1111

Intake Air Temperature (IAT) Sensor Circuit Intermittent High Voltage

C

--

--

P1112

Intake Air Temperature (IAT) Sensor Circuit Intermittent Low Voltage

C

--

--

P1114

ECT Sensor Circuit Intermittent Low Voltage

C

--

--

P1115

ECT Sensor Circuit Intermittent High Voltage

C

--

--

P1120

TP Sensor 1 Circuit

A

--

--

P1125

APP System

A

--

--

P1220

TP Sensor 2 Circuit

A

--

--

P1221

TP Sensors 1, 2 Performance

A

--

--

P1275

APP Sensor 1 Circuit

C

--

--

P1276

APP Sensor 1 Circuit Performance

C

--

--

P1280

APP Sensor 2 Circuit

C

--

--

P1281

APP Sensor 2 Circuit Performance

C

--

--

P1285

APP Sensor 3 Circuit

C

--

--

P1286

APP Sensor 3 Circuit Performance

C

--

--

P1404

EGR Valve Closed Pintle Position

B

--

--

P1514

TAC System MAF Performance

A

--

--

P1515

Commanded vs. Actual TP Performance (PCM)

A

--

--

P1516

Commanded vs. Actual TP Performance (TAC Module)

A

--

--

P1517

TAC Module Processor

A

--

--

P1518

PCM/TAC Module Serial Data Circuit

A

--

--