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Home›Repair guides›General Motors›Engine Control Module (ECM) Replacement

General Motors 8.1 — Engine Control Module (ECM) Replacement

Repair & overhaul

For the General Motors 8.1, from the General Motors service manual.

Applies to: General Motors 8.1L engine

Before you start

  • Ignition must be OFF and battery disconnected before disconnecting ECM connectors.

Procedure

  1. Disconnect the negative battery cable.
  2. Disconnect the J1 and J2 connectors from the ECM.
  3. Remove the three ECM mounting screws.
  4. Remove the ECM from the mounting bracket.
  5. Install the new ECM to the mounting bracket.
  6. Install the three ECM mounting screws.
  7. Reconnect the J1 and J2 connectors to the ECM.
  8. Reconnect the negative battery cable.

Specs & values

Source: General Motors service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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