GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 Savana 🢒 Engine 🢒 Engine Controls - 6.5L (L65) 🢒 Diagnostic Trouble Code (DTC) List

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

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. Export vehicles may have differences in DTC types that will affect Malfunction Indicator Lamp (MIL) operation.

Type A: The PCM illuminates the malfunction indicator lamp (MIL) on the first drive trip that the diagnostic runs and fails.

Type B: The PCM illuminates the malfunction indicator lamp (MIL) on the second consecutive drive trip that the diagnostic runs and fails.

Type C: The PCM illuminates the Service Throttle Soon lamp only when there is more than one DTC (Type C) stored.

Type C*: The PCM will not illuminate a service lamp but will store a Failure Record on the first drive trip that the diagnostic runs and fails.

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.

DTC

Description

RPO L65

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 Circuit Low Voltage

B

P0118

Engine Coolant Temperature (ECT) Sensor Circuit High Voltage

B

P0121

Accelerator Pedal Position (APP) Sensor 1 Circuit Performance

C

P0122

Accelerator Pedal Position (APP) Sensor 1 Circuit Low Voltage

C

P0123

Accelerator Pedal Position (APP) Sensor 1 Circuit High Voltage

C

P0126

Insufficient Coolant Temperature for Stable Operation

B

P0182

Fuel Temperature Sensor Circuit Low Voltage

B

P0183

Fuel Temperature Sensor Circuit High Voltage

B

P0215

Engine Shut off Control Circuit

C*

P0216

Injection Timing Control Circuit

B

P0219

Engine Overspeed Condition

C*

P0220

Accelerator Pedal Position (APP) Sensor 2 Circuit

C

P0221

Accelerator Pedal Position (APP) Sensor 2 Circuit Performance

C

P0222

Accelerator Pedal Position (APP) Sensor 2 Circuit Low Voltage

C

P0223

Accelerator Pedal Position (APP) Sensor 2 Circuit High Voltage

C

P0225

Accelerator Pedal Position (APP) Sensor 3 Circuit

C

P0226

Accelerator Pedal Position (APP) Sensor 3 Circuit Performance

C

P0227

Accelerator Pedal Position (APP) Sensor 3 Circuit Low Voltage

C

P0228

Accelerator Pedal Position (APP) Sensor 2 Circuit High Voltage

C

P0231

Fuel Pump Feedback Circuit Low Voltage

B

P0236

Turbocharger Boost System

B

P0237

Turbocharger Boost Sensor Circuit Low Voltage

B

P0238

Turbocharger Boost Sensor Circuit High Voltage

B

P0251

Injection Pump Cam System

A

P0263

Cylinder 1 Balance System

C*

P0266

Cylinder 2 Balance System

C*

P0269

Cylinder 3 Balance System

C*

P0272

Cylinder 4 Balance System

C*

P0275

Cylinder 5 Balance System

C*

P0278

Cylinder 6 Balance System

C*

P0281

Cylinder 7 Balance System

C*

P0284

Cylinder 8 Balance System

C*

P0300

Engine Misfire Detected

C*

P0301

Cylinder 1 Misfire Detected

C*

P0302

Cylinder 2 Misfire Detected

C*

P0303

Cylinder 3 Misfire Detected

C*

P0304

Cylinder 4 Misfire Detected

C*

P0305

Cylinder 5 Misfire Detected

C*

P0306

Cylinder 6 Misfire Detected

C*

P0307

Cylinder 7 Misfire Detected

C*

P0308

Cylinder 8 Misfire Detected

C*

P0335

Crankshaft Position (CKP) Sensor Circuit

A

P0370

Timing Reference High Resolution

A

P0380

Glow Plug Circuit Performance

B

P0501

Vehicle Speed Sensor Circuit

C*

P0567

Cruise Resume Circuit

C*

P0568

Cruise Set Circuit

C*

P0571

Cruise Brake Switch Circuit

C*

P0601

Internal Control Module Memory

A

P0602

Control Module Programming

C*

P0604

Control Module Random Access Memory Check Sum

C*

P0606

PCM Internal Communication Interrupted

A

P1125

Accelerator Pedal Position System

C

P1214

Injection Pump Timing Offset

B

P1216

Fuel Solenoid Response Time too Short

B

P1217

Fuel Solenoid Response Time too Long

B

P1218

Injection Pump Calibration Circuit

B

P1621

EEPROM Write

C*

P1626

VTD Controller Serial Data Circuit

C*

P1627

A/D Performance

B

P1631

Theft Deterrent Password Incorrect

C*

P1635

5 Volt Reference Low

B

P1641

Malfunction Indicator Lamp (MIL) Control Circuit

C*

P1643

Glow Plug Lamp Control Circuit

B

P1654

Service Throttle Soon Lamp Control Circuit

C*

P1656

Wastegate Solenoid Control Circuit

B