Diagnostic Trouble Code Definitions

WARNING: This page is about a different car, the 2002 GMC Yukon XL, 2002 GMC Sierra, 2002 Chevrolet Suburban, and 2002 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Only transmission-related DTCs are listed. For engine-related DTC definitions, see appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. These DTCs pertain to engine performance and must be repaired first, as engine performance and related component signals will affect transmission operation and diagnosis.

DIAGNOSTIC TROUBLE CODE DEFINITIONS ⁽¹⁾

DTC ⁽²⁾

Description

Transmission Preference Switch Circuit - Low Input

Transmission Fluid Overtemperature

VSS Circuit - Low Input

VSS Circuit - Intermittent

Transmission Range Switch Circuit - Low Input

TFT Sensor Circuit - Range/Performance

TFT Sensor Circuit - Low Input

TFT Sensor Circuit - High Input

ISS Circuit - Intermittent

ISS Circuit - Low Input

Brake Switch Circuit - Low Input

Brake Switch Circuit - High Input

Incorrect Gear Ratio

TCC System - Stuck Off

TCC System - Stuck On

PC Solenoid Circuit - Electrical Malfunction

1-2 Shift Solenoid Valve - Performance

1-2 Shift Solenoid Valve - Performance

1-2 Shift Solenoid Valve Circuit - Electrical Malfunction

2-3 Shift Solenoid Valve - Performance

2-3 Shift Solenoid Valve - Performance

2-3 Shift Solenoid Valve Circuit - Electrical Malfunction

TFP Manual Valve Position Switch Assembly - Circuit Malfunction

TCC PWM Solenoid Circuit - Electrical Malfunction

Transmission Component Slipping

4WD Low Switch Circuit - Electrical Malfunction

⁽¹⁾	Some DTCs are model specific.

⁽²⁾	For DTC diagnostic procedures, see DIAGNOSTIC TESTS .