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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 208 (Automatic Transmission - ALLISON - Diagnosis) >> Self-Diagnostic System >> Diagnostic Trouble Code Definitions

Diagnostic Trouble Code Definitions

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis 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 transaxle operation and diagnosis.
DIAGNOSTIC TROUBLE CODE DEFINITIONS (1)

DTC (2) Description
P0218  Transmission Fluid Over Temperature
P0500  Vehicle Speed Sensor Circuit
P0561  Unrealistic Variations In Vehicle System Voltage
P0562  System Voltage Low
P0563  System Voltage High
P0700  MIL Illumination Requested
P0701  Transmission Control System Performance
P0703  Brake Switch Circuit
P0708  Transmission Range Sensor Circuit High Input
P0711  Transmission Fluid Temperature Sensor Circuit - Performance
P0712  Transmission Fluid Temperature Sensor Circuit - Low Input (High Temperature)
P0713  Transmission Fluid Temperature Sensor Circuit - High Input (Low Temperature)
P0716  Turbine Speed Sensor Circuit - Performance
P0717  Turbine Speed Sensor Circuit - No Signal
P0721  Output Speed Sensor Circuit - Performance
P0722  Output Speed Sensor Circuit - No Signal
P0726  Engine Speed Sensor Circuit - Performance
P0727  Engine Speed Sensor Circuit - No Signal
P0731  Incorrect 1st Gear Ratio
P0732  Incorrect 2nd Gear Ratio
P0733  Incorrect 3rd Gear Ratio
P0734  Incorrect 4th Gear Ratio
P0735  Incorrect 5th Gear Ratio
P0736  Incorrect Reverse Ratio
P0741  Torque Converter Clutch System Stuck Off
P0742  Torque Converter Clutch System Stuck On
P0743  Torque Converter Clutch - Electrical
P0746  Solenoid "A" Controlled Clutch Stuck Off
P0747  Solenoid "A" Controlled Clutch Stuck On
P0748  Pressure Control Solenoid "A" Electrical
P0763  Shift Solenoid "C" Electrical
P0768  Shift Solenoid "D" Electrical
P0773  Shift Solenoid "E" Electrical
P0776  Solenoid "B" Controlled Clutch Stuck Off
P0777  Solenoid "B" Controlled Clutch Stuck On
P0778  Pressure Control Solenoid "B" Electrical
P0836  4-Wheel Drive Low Switch Circuit Malfunction
P0840  Pressure Switch Solenoid "C" Circuit Malfunction
P0841  Pressure Switch Solenoid "C" Circuit Stuck Open
P0842  Pressure Switch Solenoid "C" Circuit Stuck Closed
P0843  Pressure Switch Solenoid "C" Circuit High
P0845  Pressure Switch Solenoid "D" Circuit Malfunction
P0846  Pressure Switch Solenoid "D" Circuit Stuck Open
P0847  Pressure Switch Solenoid "D" Circuit Stuck Closed
P0848  Pressure Switch Solenoid "D" Circuit High
P0870  Pressure Switch "E" Circuit Malfunction
P0871  Pressure Switch Solenoid "E" Circuit Stuck Open
P0872  Pressure Switch Solenoid "E" Circuit Stuck Closed
P0873  Pressure Switch Solenoid "E" Circuit High
P0875  Reverse Pressure Switch Circuit Malfunction
P0876  Reverse Pressure Switch Circuit Stuck Open
P0880  TCM Power Input Signal
P1571  TCS PWM Circuit No Frequency
P1688  Unmanaged Engine Torque Delivered To TCM
P1779  Engine Torque Delivered To TCM
P2810  Pressure control shift solenoid G
U2105  CAN Bus PCM Error
(1) Some DTCs are model specific.
(2) For DTC diagnostic procedures, see DIAGNOSTIC TESTS .