Diagnostic Trouble Code Definitions

DIAGNOSTIC TROUBLE CODE INDEX

DTC

⁽¹⁾ Description

⁽²⁾ Code Type

BXXXX ⁽³⁾

Body Control Systems Malfunction

N/A

CXXXX ⁽³⁾

Chassis Control System Malfunction

N/A

Mass Air Flow Sensor Performance

B

Mass Air Flow Sensor Circuit - Low Frequency

B

Mass Air Flow Sensor Circuit - High Frequency

B

MAP System Performance

B

MAP Sensor Circuit - Low Voltage

B

MAP Sensor Circuit - High Voltage

B

IAT Sensor Circuit - Low Voltage

B

IAT Sensor Circuit - High Voltage

B

ECT Sensor Performance (Sierra & Silverado)

B

ECT Sensor Performance (Avalanche, Suburban & Yukon XL)

B

ECT Sensor Circuit - Low Voltage

B

ECT Sensor Circuit - High Voltage

B

TP Sensor Circuit

A

Excess Time To Enter Closed Loop Fuel Control (Sierra & Silverado)

B

Excess Time To Enter Closed Loop Fuel Control (Avalanche, Suburban & Yukon XL)

B

ECT Less Than Thermostat Regulating Temperature (Sierra & Silverado)

B

ECT Less Than Thermostat Regulating Temperature (Avalanche, Suburban & Yukon XL)

B

HO2S Circuit - Low Voltage - Bank 1, Sensor 1

B

HO2S Circuit - High Voltage - Bank 1, Sensor 1

B

HO2S Circuit - Slow Response - Bank 1, Sensor 1

B

HO2S Circuit - Insufficient Activity - Bank 1, Sensor 1

B

HO2S Heater Circuit - Bank 1, Sensor 1

B

HO2S Circuit - Low Voltage - Bank 1, Sensor 2

B

HO2S Circuit - High Voltage - Bank 1, Sensor 2

B

HO2S Circuit - Insufficient Activity - Bank 1, Sensor 2

B

HO2S Heater Circuit - Bank 1, Sensor 2

B

HO2S Circuit - Low Voltage - Bank 2, Sensor 1

B

HO2S Circuit - High Voltage - Bank 2, Sensor 1

B

HO2S Circuit - Slow Response - Bank 2, Sensor 1

B

HO2S Circuit - Insufficient Activity - Bank 2, Sensor 1

B

HO2S Heater Circuit - Bank 2, Sensor 1

B

HO2S Circuit - Low Voltage - Bank 2, Sensor 2

B

HO2S Circuit - High Voltage - Bank 2, Sensor 2

B

HO2S Circuit - Insufficient Activity - Bank 2, Sensor 2

B

HO2S Heater Circuit - Bank 2, Sensor 2

B

Fuel Trim System Lean - Bank 1

B

Fuel Trim System Rich - Bank 1

B

Fuel Trim System Lean - Bank 2

B

Fuel Trim System Rich - Bank 2

B

Fuel Injector Control Circuit

B

Throttle Position Sensor 2 Circuit

A

Fuel Pump Control Relay Circuit

B

Engine Misfire Detected

B

Crankshaft Position Sensor Variation Not Learned

A

Knock Sensor Module Circuit

B

Knock Sensor Circuit - Low Voltage - Sensor 1

B

Knock Sensor Circuit - Low Voltage - Sensor 2

B

Crankshaft Position Sensor Circuit

B

Crankshaft Position Sensor Circuit Performance

B

Camshaft Position Sensor Circuit Performance

B

Camshaft Position Sensor Signal Low

B

Camshaft Position Sensor Signal High

B

Ignition Control Circuit

B

EGR System - Insufficient Flow

A

EGR Valve Open Pintle Position

B

EGR Valve Pintle Position Circuit - Low Voltage

B

TWC System - Low Efficiency - Bank 1

A

TWC System - Low Efficiency - Bank 2

A

EVAP System - Small Leak

A

EVAP Purge Solenoid Control Circuit

B

EVAP Vent Valve Performance

A

EVAP Vent Valve Performance

B

Fuel Tank Pressure Sensor - Low Voltage

B

Fuel Tank Pressure Sensor - High Voltage

B

EVAP System Leak Detected - Gross Leak/No Flow

A

P0461 ⁽⁴⁾

Fuel Level Sensor Circuit Performance

C

P0462 ⁽⁴⁾

Fuel Level Sensor Circuit - Low Voltage

C

P0463 ⁽⁴⁾

Fuel Level Sensor Circuit - High Voltage

C

EVAP System High Purge Flow

B

P0500 ⁽⁵⁾

Vehicle Speed Sensor

B

Idle Control System - RPM Low

B

Idle Control System - RPM High

B

P0522 ⁽⁴⁾

Engine Oil Pressure Sensor Circuit Low Voltage

C

P0523 ⁽⁴⁾

Engine Oil Pressure Sensor Circuit High Voltage

C

P0530 ⁽⁶⁾

A/C Refrigerant Pressure Sensor Circuit

C

P0562 ⁽⁷⁾

Low System Voltage

C

P0563 ⁽⁷⁾

High System Voltage

C

P0567 ⁽⁸⁾

Cruise Control Resume/Accel Switch Circuit

C

P0568 ⁽⁸⁾

Cruise Control Set/Coast Switch Circuit

C

P0571 ⁽⁸⁾

Cruise Control Brake Switch Circuit

C

PCM Memory

A

P0608 ⁽⁴⁾

Vehicle Speed Circuit Fault

C

P0609 ⁽³⁾

Vehicle Speed Signal Circuit - Low Voltage

C

P0615 ⁽³⁾

Starter Relay Circuit

C

5-Volt Reference Circuit Out Of Range

B

Malfunction Indicator Lamp Control Circuit

B

Sensor Reference Voltage "B" Circuit/Open

B

P0654 ⁽⁴⁾

Engine Speed Circuit Fault

C

Transmission Control System (MIL Request)

A

P0704 ⁽⁹⁾

Clutch Pedal Switch Input Circuit

B

P0706 ⁽¹⁰⁾

Transmission Range Switch

C

Transmission Control System MIL Request Circuit Open

B

MAP Sensor Circuit Intermittent High Voltage

C

MAP Sensor Circuit Intermittent Low Voltage

C

Intake Air Temperature Sensor Circuit - Intermittent High Voltage

C

Intake Air Temperature Sensor Circuit - Intermittent Low Voltage

C

Engine Coolant Temperature Sensor Circuit - Intermittent Low Voltage

C

Engine Coolant Temperature Sensor Circuit - Intermittent High Voltage

C

Accelerator Pedal Position Sensors Out Of Range Or Disagree

A

HO2S Circuit - Insufficient Switching - Bank 1, Sensor 1

B

HO2S Circuit - Insufficient Switching - Bank 2, Sensor 1

B

Secondary Fuel Pump Transfer Malfunction

C

P1258 ⁽¹¹⁾

Engine Over-Temperature Condition

A

EBCM DTC Detected Rough Road Data Unstable

C

Misfire Detected - No EBCM/PCM Serial Data

C

EGR Valve Closed Pintle Position

B

Airflow Rate Excessive

A

Predicted VS Actual Throttle Position Correlation Error

A

Predicted VS Actual Throttle Position Correlation Error

A

Throttle Actuator Control Module Serial Data Fault

A

P1571 ⁽¹⁰⁾

Requested Torque Signal Circuit Malfunction

B

P1574 ⁽⁸⁾

Stop Light Switch Transition Malfunction

C

PCM Memory

A

PCM Memory

A

P1626 ⁽¹²⁾

Passlock® System Malfunction

C

PCM Memory

A

P1631 ⁽¹²⁾

Passlock® System Malfunction

C

P1637 ⁽⁷⁾

Generator "L" Terminal Circuit - Improper Voltage Level

C

P1638 ⁽⁷⁾

Generator Field Duty Cycle Signal Circuit Out Of Range

C

PCM Memory

A

PCM Memory

A

PCM Memory

B

P2066 ⁽⁴⁾

Secondary Fuel Level Sensor Signal Lack Of Variation

C

P2067 ⁽⁴⁾

Secondary Fuel Level Sensor Signal Lower Than Normal

C

P2068 ⁽⁴⁾

Secondary Fuel Level Sensor Signal Higher Than Normal

C

Throttle Actuator Control Module Circuit Fault

A

APP Sensor 1 Signal Or APP Sensor 5-Volt Reference Out Of Range

C

APP Sensor 1 Signal And APP Sensor 2 Signal Circuits Out Of Correlation

C

APP Sensor 2 Signal Or APP Sensor 5-Volt Reference Out Of Range

C

TP Sensors No. 1 & 2 Signals Disagree Or Signal Voltages Out Of Range

A

PCM Memory

A

UXXXX ⁽³⁾

Network Communication System Malfunction

N/A

⁽¹⁾	DTC definitions may vary depending on vehicle and/or engine configuration.

⁽²⁾	See CODE TYPES under ON-BOARD DIAGNOSTICS.

⁽³⁾	See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.

⁽⁴⁾	See appropriate ANALOG INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT.

⁽⁵⁾	On vehicles equipped with A/T, see appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS. On vehicles equipped with M/T, see appropriate DIAGNOSIS article in MANUAL TRANSMISSIONS.

⁽⁶⁾	See appropriate A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING.

⁽⁷⁾	See appropriate GENERATORS & REGULATORS article in STARTING & CHARGING SYSTEMS.

⁽⁸⁾	See appropriate CRUISE CONTROL SYSTEMS article in ACCESSORIES & EQUIPMENT.

⁽⁹⁾	see appropriate DIAGNOSIS article in MANUAL TRANSMISSIONS.

⁽¹⁰⁾	See appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS.

⁽¹¹⁾	See appropriate ELECTRIC COOLING FANS article in ENGINES.

⁽¹²⁾	See appropriate ANTI-THEFT SYSTEMS article in ACCESSORIES & EQUIPMENT.