General Motors — Engine Control Module (ECM) Replacement
Repair & overhaul
From a General Motors service manual — check it applies to your exact model before use.
Before you start
- Ignition must be OFF and battery disconnected before disconnecting or reconnecting ECM J1, J2 and J3 connectors
- Do not touch the connector pins to prevent electrostatic discharge damage
Procedure
- Disconnect negative battery cable
- Disconnect J1, J2 and J3 connectors from ECM
- Remove four ECM mounting screws
- Remove ECM from mounting bracket
- Install new ECM to mounting bracket
- Install four ECM mounting screws; torque to 10-14 N·m (88-124 lb.in.)
- Connect J1, J2 and J3 connectors to ECM
- Connect negative battery cable
Specs & values
- ECM Mounting Screws: 10-14 FridayParts $66.00 N·m (88-124 FridayParts $122.60 lb.in.)
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.