2000 Chevrolet Malibu BaseFACTORY OEM SERVICE PROCEDURE

DTC U2003: Transmitted SPI Data Input High: Testing

  1. If Body Control Module (BCM) diagnostic system check has been performed, go to next step. If Body Control Module (BCM) diagnostic system check has not been performed, go to BODY CONTROL MODULE (BCM) DIAGNOSTIC SYSTEM CHECK  under SYSTEM TESTS.
  2. Connect scan tool to Data Link Connector (DLC), located to left of steering column. Turn ignition on. Select SPI data inputs list. If SPI DATA INPUT is not XXX, go to next step. If SPI DATA INPUT is XXX, go to DIAGNOSTIC AIDS  .
  3. Turn ignition off. Check for open or short to power on Light Blue/Black wire between Gray 24-pin instrument panel cluster harness connector terminal A2 and Gray 24-pin BCM harness connector C2 terminal B7. See Figure andFigure . If no problem is found, go to next step. If open or short to power exists, repair as necessary. After repair, go to step  7 .
  4. Check for damage or poor connection at BCM and harness connector terminals. If no problem is found, go to next step. If a problem exists, repair as necessary. After repair, go to step  7 .
  5. Check for damage or poor connection at instrument cluster and harness connector terminals. If no problem is found, go to next step. If a problem exists, repair as necessary. After repair, go to step  7 .
  6. Replace instrument cluster. See ANALOG INSTRUMENT PANELS - MALIBU article. After repair, go to next step.
  7. Reconnect all disconnected components and connectors. Clear DTCs. Operate vehicle under conditions that set DTC. If DTC resets, go to next step. If DTC does not reset, system is okay.
  8. Replace BCM. See BODY CONTROL MODULE (BCM)  under REMOVAL & INSTALLATION. Program BCM. See BODY CONTROL MODULE (BCM)  under PROGRAMMING.
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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.