GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1999 🢒 Monte Carlo 🢒 Engine 🢒 Engine Controls - 3.1L 🢒 Diagnostic Trouble Code (DTC) List

The service information contained in this manual refers to the Federal calibration package. The export change is NOT reflected in the service information on the DTC's diagnostic support information page or in the Repair Instructions. The DTC Type table 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.

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

DTC

Description

Domestic

RPO L82

Export Unleaded

RPO L82

Export Leaded

P0101

Mass Air Flow (MAF) System Performance

B

B

X

P0102

Mass Air Flow (MAF) Sensor Circuit Low Frequency

B

B

X

P0103

Mass Air Flow (MAF) Sensor Circuit High Frequency

B

B

X

P0107

Manifold Absolute Pressure (MAP) Sensor Circuit Low Voltage

B

B

X

P0108

Manifold Absolute Pressure (MAP) Sensor Circuit High Voltage

B

B

X

P0112

Intake Air Temperature (IAT) Sensor Circuit Low Voltage

B

B

X

P0113

Intake Air Temperature (IAT) Sensor Circuit High Voltage

B

B

X

P0117

Engine Coolant Temperature (ECT) Sensor Circuit Low Voltage

B

B

X

P0118

Engine Coolant Temperature (ECT) Sensor Circuit High Voltage

B

B

X

P0121

Throttle Position (TP) System Performance

B

B

X

P0122

Throttle Position (TP) Sensor Circuit Low Voltage

B

B

X

P0123

Throttle Position (TP) Sensor Circuit High Voltage

B

B

X

P0125

Engine Coolant Temperature (ECT) Excessive Time to Closed Loop Fuel Control

B

B

X

P0131

HO2S Circuit Low Voltage Sensor 1

B

B

X

P0132

HO2S Circuit High Voltage Sensor 1

B

B

X

P0133

HO2S Slow Response Sensor 1

B

B

X

P0134

HO2S Circuit Insufficient Activity Sensor 1

B

B

X

P0135

HO2S Heater Circuit Sensor 1

B

B

X

P0137

HO2S Circuit Low Voltage Sensor 2

B

B

X

P0138

HO2S Circuit High Voltage Sensor 2

B

B

X

P0140

HO2S Circuit Insufficient Activity Sensor 2

B

B

X

P0141

HO2S Heater Circuit Sensor 2

B

B

X

P0171

Fuel Trim System Lean

B

B

X

P0172

Fuel Trim System Rich

B

B

X

P0201

Injector 1 Control Circuit

B

B

X

P0202

Injector 2 Control Circuit

B

B

X

P0203

Injector 3 Control Circuit

B

B

X

P0204

Injector 4 Control Circuit

B

B

X

P0205

Injector 5 Control Circuit

B

B

X

P0206

Injector 6 Control Circuit

B

B

X

P0218

Transmission Fluid Overtemperature

C

C

X

P0230

Fuel Pump Circuit Fault

C

C

X

P0300

Engine Misfire Detected

B

B

X

P0325

Knock Sensor Circuit

B

B

X

P0327

Knock Sensor Circuit Bank 1

B

B

X

P0336

24X Reference Signal

B

B

X

P0341

CMP Sensor Circuit Performance

B

B

X

P0401

EGR System Flow Insufficient

A

A

X

P0403

EGR Solenoid Circuit

B

B

X

P0404

EGR System Performance

B

B

X

P0405

EGR Pintle Position Circuit Low Voltage

B

B

X

P0420

TWC System Low Efficiency

A

A

X

P0440

EVAP System

A

A

X

P0442

EVAP Control System Small Leak Detected

A

A

X

P0443

EVAP Purge Solenoid Valve Control Circuit

B

B

X

P0446

EVAP Canister Vent Blocked

A

A

X

P0449

EVAP Vent Valve Solenoid Control Circuit

B

B

X

P0452

Fuel Tank Pressure Sensor Low Voltage

B

B

X

P0453

Fuel Tank Pressure Sensor High Voltage

B

B

X

P0462

Fuel Level Sensor Circuit Low Voltage

C

C

X

P0463

Fuel Level Sensor Circuit High Voltage

C

C

X

P0480

Fan Control Relay 1 Control Circuit

B

B

X

P0481

Fan Control Relay 2 Control Circuit

B

B

X

P0502

VSS Circuit Low Input

A

A

X

P0503

VSS Circuit - Intermittent Input

A

A

X

P0506

Idle Control System Low RPM

B

B

X

P0507

Idle Control System High RPM

B

B

X

P0530

A/C Refrigerant Pressure Sensor Circuit

C

C

X

P0560

System Voltage

C

C

X

P0601

PCM Memory

A

A

X

P0602

PCM Not Programmed

A

A

X

P0620

Generator Control Circuit

C

C

X

P0650

MIL Control Circuit

A

A

X

P0656

Fuel Guage Control Circuit

C

C

X

P0705

Trans Range Switch Circuit

B

B

X

P0706

Trans Range Switch Performance

B

B

X

P0711

TFT Sensor Circuit Range/Performance.

C

C

X

P0712

TFT Sensor Circuit Low Input.

C

C

X

P0713

TFT Sensor Circuit High Input.

C

C

X

P0719

Brake Switch Circuit Low Input.

C

C

X

P0724

Brake Switch Circuit High Input.

C

C

X

P0740

TCC Enable Solenoid Circuit Electrical.

B

B

X

P0742

TCC System Stuck On.

B

B

X

P0751

1-2 Shift Solenoid Valve Performance.

A

A

X

P0753

1-2 Shift Solenoid Circuit Electrical.

B

B

X

P0756

Shift Solenoid 2 (2-3 Shift Solenoid) Performance.

A

A

X

P0758

Shift Solenoid 2 (2-3 Shift Solenoid) Electrical.

A

A

X

P1106

Manifold Absolute Pressure (MAP) Sensor CKT Intermittent High Voltage

C

C

X

P1107

Manifold Absolute Pressure (MAP) Sensor CKT Intermittent Low Voltage

C

C

X

P1111

Intake Air Temperature (IAT) Sensor CKT Intermittent High Votlage

C

C

X

P1112

Intake Air Temperature (IAT) Sensor CKT Intermittent Low Votlage

C

C

X

P1114

Engine Coolant Temperature (ECT) Sensor CKT Intermittent Low Voltage

C

C

X

P1115

Engine Coolant Temperature (ECT) Sensor CKT Intermittent High Voltage

C

C

X

P1121

Throttle Position (TP) Sensor CKT Intermittent High Voltage

C

C

X

P1122

Throttle Position (TP) Sensor CKT Intermittent Low Voltage

C

C

X

P1133

HO2S Insufficient Switching Sensor 1

B

B

X

P1134

HO2S Transition Time Ratio Sensor 1

B

B

X

P1336

CKP System Variation Not Learned

A

A

X

P1351

IC Circuit Open

B

B

X

P1352

Bypass Circuit Open

B

B

X

P1361

IC Circuit Not Toggling

B

B

X

P1362

Bypass Circuit Shorted

B

B

X

P1374

3X Reference Circuit

B

B

X

P1380

EBCM DTC Rough Road Data Unusable

C

C

X

P1381

Misfire Detected No EBCM/PCM Serial Data

C

C

X

P1404

EGR Valve Circuit Performance

A

A

X

P1441

EVAP System Flow During Non-Purge

B

B

X

P1483

Engine Cooling System Performance

C

C

X

P1546

A/C Relay Control Circuit

C

C

X

P1554

Cruise Control Status Circuit

C

C

X

P1573

PCM/EBTCM Serial Data Circuit

C

C

X

P1585

Cruise Inhibit Control Circuit

C

C

X

P1626

Theft Deterrent System Fuel Enable CKT

C

C

X

P1629

Theft Deterrent Crank Signal Malfunction

C

C

X

P1635

5 Volt Reference (A) Circuit

B

B

X

P1637

Generator Lamp Control Circuit

C

C

X

P1639

5 Volt Reference (B) Circuit

B

B

X

P1653

Low Oil Lamp Control Circuit

C

C

X

P1663

Change Oil Lamp Control Circuit

C

C

X

P1814

Torque Converter Overstress

C

C

X

P1860

TCC PWM Solenoid Circuit Electrical

B

B

X

P1870

Transmission Component Slipping

B

B

X