GM Service Manual Online
For 1990-2009 cars only

The service information contained in this manual refers to the Federal calibration package - the United States, Canada and Japan. For Unleaded Export calibration vehicles some DTCs have been changed from type B to type D or, in some cases, turned off (the diagnostic does not run, no codes are stored, and the Malfunction Indicator Lamp (MIL) will not illuminate. This change is NOT reflected in the service information on the DTCs diagnostic support information page or in the Repair Instructions. 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 D DTC will set after one failure and be stored in history but will not illuminate the Malfunction Indicator Lamp (MIL). Unleaded Export calibration vehicles are referenced only in the DTC Type table.

If a system is malfunctioning and the associated DTC has been disabled, 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.

Important: An export vehicle may have unrequired emissions components removed.

Important: For Automatic Transmission DTC types, refer to Transmission.

Diagnostic Trouble Code (DTC) Type Table

DTC

Description

Domestic

RPO L36

Illuminate MIL

P0101

Mass Air Flow System Performance

A

Yes

P0102

MAF Sensor Circuit Low Frequency

A

Yes

P0103

MAF Sensor Circuit High Frequency

A

Yes

P0107

MAP Sensor Circuit Low Voltage

B

Yes

P0108

MAP Sensor Circuit High Voltage

B

Yes

P0112

IAT Sensor Circuit Low Voltage

B

Yes

P0113

IAT Sensor Circuit High Voltage

B

Yes

P0117

ECT Sensor Circuit Low Voltage

B

Yes

P0118

ECT Sensor Circuit High Voltage

B

Yes

P0121

TP Sensor Performance

A

Yes

P0122

TP Sensor Circuit Low Voltage

A

Yes

P0123

TP Sensor Circuit High Voltage

A

Yes

P0125

ECT Excessive Time to Closed Loop

A

Yes

P0131

HO2S Circuit Low Voltage Bank 1 Sensor 1

B

Yes

P0132

HO2S Circuit High Voltage Bank 1 Sensor 1

B

Yes

P0133

HO2S Circuit Slow Response Bank 1 Sensor 1

B

Yes

P0134

HO2S CKT Insufficient Activity Bank 1 Sensor 1

B

Yes

P0135

HO2S Heater Circuit Bank 1 Sensor 1

B

Yes

P0143

HO2S Circuit Low Voltage Bank 1 Sensor 3 (Post-Converter)

B

Yes

P0144

HO2S Circuit High Voltage Bank 1 Sensor 3 (Post-Converter)

B

Yes

P0146

HO2S Circuit Insufficient Activity Bank 1 Sensor 3 (Post-Converter)

B

Yes

P0147

HO2S Heater Circuit Bank 1 Sensor 3 (Post-Converter)

B

Yes

P0151

HO2S Circuit Low Voltage Bank 2 Sensor 1

B

Yes

P0152

HO2S Circuit High Voltage Bank 2 Sensor 1

B

Yes

P0153

HO2S Circuit Slow Response Bank 2 Sensor 1

B

Yes

P0154

HO2S Circuit Insufficient Activity Bank 2 Sensor 1

B

Yes

P0155

HO2S Heater Circuit Bank 2 Sensor 1

B

Yes

P0171

Fuel Trim System Lean Bank 1

B

Yes

P0172

Fuel Trim System Rich Bank 1

B

Yes

P0174

Fuel Trim System Lean Bank 2

B

Yes

P0175

Fuel Trim System Rich Bank 2

B

Yes

P0201

Injector 1 Control Circuit

B

Yes

P0202

Injector 2 Control Circuit

B

Yes

P0203

Injector 3 Control Circuit

B

Yes

P0204

Injector 4 Control Circuit

B

Yes

P0205

Injector 5 Control Circuit

B

Yes

P0206

Injector 6 Control Circuit

B

Yes

P0300

Engine Misfire Detected

B

Yes

P0325

Knock Sensor System

D

Yes

P0327

Knock Sensor Circuit Bank 1

D

No

P0332

Knock Sensor Circuit Bank 2

D

No

P0336

18X Reference Signal Circuit

B

Yes

P0341

CMP Sensor Circuit Performance

B

Yes

P0401

EGR System Flow Insufficient

A

Yes

P0403

EGR Solenoid Control Circuit

B

Yes

P0404

EGR System Performance

B

Yes

P0405

EGR Pintle Position Circuit Low Voltage

B

Yes

P0420

TWC System Low Efficiency

A

Yes

P0440

EVAP System

A

Yes

P0442

EVAP Control System Small Leak Detected

A

Yes

P0446

EVAP Canister Vent Blocked

A

Yes

P0452

Fuel Tank Pressure Sensor Circuit Low Voltage

B

Yes

P0453

Fuel Tank Pressure Sensor Circuit High Voltage

B

Yes

P0500

Vehicle Speed Sensor Circuit

B

Yes

P0506

Idle Control System Low RPM

B

Yes

P0507

Idle Control System High RPM

B

Yes

P0530

A/C Refrigerant Pressure Sensor Circuit

D

No

P0560

System Voltage

D

No

P0601

PCM Memory

B

Yes

P0602

PCM Not Programmed

B

Yes

P0704

Clutch Anticipate Switch Circuit

D

No

P0705

Trans Range Switch Circuit

D

No

P0706

Trans Range Switch Performance

D

No

P0711

Transaxle Fluid Temperature (TFT) Sensor Circuit Performance. Refer to 4L60-E Automatic Transmission Diagnosis

D

No

P0712

Transaxle Fluid Temperature (TFT) Sensor Circuit - Low Signal. Refer to 4L60-E Automatic Transmission Diagnosis

D

No

P0713

Transaxle Fluid Temperature (TFT) Sensor Circuit - High Signal Voltage. Refer to 4L60-E Automatic Transmission Diagnosis

D

No

P0716

Automatic Transmission Input (Shaft) Speed Sensor Circuit Performance. Refer to 4L60-E Automatic Transmission Diagnosis

B

Yes

P0717

Automatic Transmission Input (Shaft) Speed Sensor No Input. Refer to 4L60-E Automatic Transmission

B

Yes

P0719

Brake Switch Circuit Low. Refer to 4L60-E Automatic Transmission Diagnosis

D

No

P0724

Brake Switch Circuit High. Refer to 4L60-E Automatic Transmission Diagnosis

D

No

P0730

Incorrect Gear Ratio. Refer to 4L60-E Automatic Transmission

D

No

P0741

Torque Converter Clutch System Stuck Off. Refer to 4L60-E Automatic Transmission Diagnosis

B

Yes

P0742

Torque Converter Clutch System Stuck On. Refer to 4L60-E Automatic Transmission Diagnosis

A

Yes

P0748

Pressure Control Solenoid Valve Circuit Malfunction. Refer to 4L60-E Automatic Transmission Diagnosis

D

Yes

P0751

Shift Solenoid 1 - Performance/Stuck Off. Refer to 4L60-E Automatic Transmission Diagnosis

B

Yes

P0753

Shift Solenoid 1 - Electrical. Refer to 4L60-E Automatic Transmission Diagnosis

A

Yes

P0756

Shift Solenoid 2 - Performance/Stuck Off. Refer to 4L60-E Automatic Transmission Diagnosis

A

Yes

P0758

Shift Solenoid 2 - Electrical. Refer to 4L60-E Automatic Transmission Diagnosis

A

Yes

P1106

MAP Sensor CKT Intermittent High Voltage

D

No

P1107

MAP Sensor CKT Intermittent Low Voltage

D

No

P1111

IAT Sensor CKT Intermittent High Voltage

D

No

P1112

IAT Sensor CKT Intermittent Low Voltage

D

No

P1114

ECT Sensor CKT Intermittent Low Voltage

D

No

P1115

ECT Sensor CKT Intermittent High Voltage

D

No

P1121

TP Sensor CKT Intermittent High Voltage

D

No

P1122

TP Sensor CKT Intermittent Low Voltage

D

No

P1133

HO2S Insufficient Switching Bank 1 Sensor 1

B

Yes

P1134

HO2S Transition Time Ratio Bank 1 Sensor 1

B

Yes

P1153

HO2S Insufficient Switching Bank 2 Sensor 1

B

Yes

P1154

HO2S Transition Time Ratio Bank 2 Sensor 1

B

Yes

P1336

CKP System Variation Not Learned

A

Yes

P1351

IC Circuit Open

B

Yes

P1352

Bypass Circuit Open

B

Yes

P1361

IC Circuit Not Toggling

B

Yes

P1362

Bypass Circuit Shorted

B

Yes

P1374

3X Reference Circuit

B

Yes

P1380

EBCM DTC Rough Data Unstable

D

No

P1381

Misfire Detected No EBCM/PCM Serial Data

D

No

P1404

EGR Valve Closed Pintle Position

B

Yes

P1441

EVAP System Flow During Non-Purge

B

Yes

P1554

Cruise Control Status Circuit

D

No

P1626

Theft Deterrent System Fuel Enable CKT

D

No

P1629

Theft Deterrent Crank Signal Malfunction

D

No

P1635

5 Volt Reference (A) Circuit

B

Yes

P1639

5 Volt Reference (B) Circuit

B

Yes

P1641

A/C Relay Control Circuit

D

No

P1651

Fan 1 Relay Control Circuit

B

Yes

P1652

Fan 2 and 3 Relay Control Circuit

B

Yes

P1653

Fuel Level Output Control Circuit

D

No

P1662

Cruise Control Inhibit Control Circuit

D

No

P1663

Generator Lamp Control Circuit

D

No

P1665

EVAP Vent Solenoid Control Circuit

B

Yes

P1671

MIL Control Circuit

D

No

P1672

Low Engine Oil Level Lamp Control Circuit

D

No

P1676

EVAP Canister Purge Solenoid Control CKT

B

Yes

P1810

Automatic Transmission Fluid Pressure Manual Valve Position Switch Malfunction. Refer to 4L60-E Automatic Transmission Diagnosis

B

Yes

P1811

Maximum Adapt and Long Shift. Refer to4L60-E Automatic Transmission Diagnosis

D

No

P1860

Torque Converter Clutch PWM Solenoid Circuit. Refer to 4L60-E Automatic Transmission Diagnosis

A

Yes

P1887

TCC Release Switch Malfunction. Refer to4L60-E Automatic Transmission Diagnosis

B

Yes