OEM Buick Lucerne Engine Control Module

Buick Lucerne Engine Control Module Parts and Q&A

• PCM
  12600930
  Q: How to replace the Engine Control Module (ECM) on Buick Lucerne?

  A:

  The first step to replace the powertrain control module (PCM) includes recording engine oil life and automatic transaxle fluid life through a scan tool because missing this programming step will reset both values to 100 percent leading to immediate oil replacement at 5000 km and automatic transaxle fluid replacement at 83000 km after the previous changes. Proceed to remove the negative Battery Cable after turning off the engine. Begin by removing the intake manifold cover then unplug the engine harness from the mass air flow/intake air temperature sensor and cut the positive crankcase ventilation tube from the air cleaner outlet duct. The air cleaner outlet duct should be loosened at the Throttle Body while the lower housing clips should be detached to remove the air cleaner upper housing. The pcm and its connector need to pass through the air cleaner lower housing after disconnecting their locking mechanism at the pcm harness. The first step before installing the new pcm involves a thorough examination of the air filter/pcm housing assembly alongside the maf/iat sensor inlet screen for any debris presence. Additionally check for damage to the housing or intake air duct so the affected components can be replaced if necessary. The new pcm assembly receives placement inside the lower air cleaner housing after which the engine harness electrical connectors get reconnected while ensuring that the connector lever locks are activated. The air cleaner reassembly requires placing the upper housing front tabs properly within the lower housing before securing the lower housing clips. Crank the air cleaner outlet duct against the Throttle Body before tightening its clamp to 3 n.m (27 lb in) while connecting the pcv tube to the outlet duct followed by the engine harness electrical connection to maf/iat sensor. Reinstall the intake manifold cover following a connection of the negative Battery Cable after you run a pcm programming procedure.