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HOMESERVICE MANUALSBUICK2005LESABRE LIMITED, 4T65E/M15REPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - INTRODUCTIONREPAIR INSTRUCTIONSPOWERTRAIN CONTROL MODULE (PCM) REPLACEMENTINSTALLATION PROCEDURE
2005 Buick LeSabre Limited, 4T65E/M15

Installation Procedure

2005 Buick LeSabre Limited, 4T65E/M15SECTION Installation Procedure
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  1. Reconnect the PCM connectors (1).

    Tighten:  Tighten the connectors to 8 N.m (71 lb in).

    2. Fig 1: View of PCM Connectors, PCM, and PCM Housing
    GM481275Courtesy of GENERAL MOTORS CORP.
  2. Carefully reinstall the PCM (3) and harness into the PCM housing (2).
    3. Fig 2: View of Upper Air Cleaner Housing Assembly and Screws
    GM481272Courtesy of GENERAL MOTORS CORP.
  3. Install the upper air cleaner housing assembly (1).
  4. Install the 2 screws (2) into the upper and lower air cleaner assembly sections.

    Tighten:  Tighten the screws to 4 N.m (35 lb in).

  5. Install the intake duct. Refer to AIR CLEANER INTAKE DUCT REPLACEMENT .
  6. Reconnect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical.
  7. The Replacement PCM will NOT allow secondary AIR pump operation until a total of 10 miles have been accumulated.
  8. The new PCM must be programmed. Refer to Powertrain Control Module Programming and Setup (3.8L) in Programming and Setup.
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.