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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 26 (THEFT DETERRENT SYSTEM)DIAGNOSTIC TESTSDTC B1007: CHECKSUM VALUE ERRORDESCRIPTION
1999 GMC Forward Control 5.7 R, Automatic

DTC B1007: Checksum Value Error: Description

1999 GMC Forward Control 5.7 R, AutomaticSECTION Description
WARNING: This page is about a different car, the 2002 GMC Savana, 2002 Chevrolet Chevy Express, 2001 GMC Savana, and 2001 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.

Passlock(tm) module calculates a checksum for contents of EEPROM when voltage is first applied. This calculated checksum is compared with checksum value stored in EEPROM. A history DTC will clear after 100 consecutive ignition cycles occur without a fault. Use Scan Tool to clear history and current.

RENDER: 1.0x

NO RELATED

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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.