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HOMESERVICE MANUALSCHEVROLET2003CHEVY EXPRESS G2500, VAN CARGO EXTENDED, 6.0 UREPAIR AND DIAGNOSIS (SINGLE PAGE)BODY & FRAMEDOOR LOCKSTHEFT DETERRENT SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDIAGNOSTIC SYSTEM CHECK - THEFT DETERRENTTEST DESCRIPTION
2003 Chevrolet Chevy Express G2500, Van Cargo Extended, 6.0 U

Test Description

2003 Chevrolet Chevy Express G2500, Van Cargo Extended, 6.0 USECTION Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. 2. Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.
  2. 5. Tests for an open in the passlock sensor signal circuit which may not set a DTC B2958 under certain conditions.
  3. 6. The presence of DTCs which begin with "U" indicate some other module is not communicating. The specified procedure will compile all the available information before tests are performed.
  4. 7. The presence of DTC P0601, P0602, P0604, or P0606 indicates an internal fault in the PCM.
  5. 8. The presence of DTC B1000 indicates an internal module fault.
  6. 9. The presence of DTC P1637, P1638, P0562 or P0563 indicates a low or high voltage condition.
    Fig 1: Identifying Diagnostic System Check - Theft Deterrent Diagnostic Table (1 Of 2)
    G02422716Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.