OEM 2005 Buick LaCrosse Engine Control Module

2005 Buick LaCrosse Engine Control Module Parts and Q&A

• Q: How to replace the Engine Control Module (ECM) on 2005 Buick LaCrosse?

  A: A replacement of the Engine Control Module (ECM) must begin with shutting off the ignition to protect electronic devices. The oil life percentage must be obtained through a scan tool because neglecting this step will reset the oil to 100 percent requiring an oil change after 5000 km (3,000 mi) from the last maintenance. The main relay circuit of the ecm Fuse located in the underhood Fuse block requires measurement with a dvom in an off state where no voltage should be detected. First disconnect the negative cable from the battery before removing the ecm Fuse and the tcm/ipcm Fuse together with the ecm/tcm Fuse from the underhood Fuse block. First depress the lever lock and rotate the clamp while sliding the lock to release and remove the body side (outboard) ecm connector. Modern microcontrollers fail to function when exposed to electrostatic discharges thus pin-to-pin contact should be avoided. To begin uninstall the engine side (inboard) ecm connector and then remove its redundant ground wire and hardware before gpl/ens m5.9 34m xm0172001 page 360 instructs to unfasten the ecm bolts in sequence. You should disassemble the ecm bracket when needed through its bolt removal and by taking away the bracket itself. Reinstall the ecm bracket when possible and fasten its bolts to 10 n.m (89 lb in). The installation process starts by securing the ecm through proper bolt tightening up to 10 n.m (89 lb in) for the bolts and up to 5 n.m (44 lb in) for the redundant ground wire bolt. Start by reconnecting the ecm connector positioned on the engine side and then move to connect the ecm connector placed on the body side. Place back the ecm/tcm Fuse together with tcm/ipc Fuse and ecm Fuse within the underhood Fuse block before reconnecting the battery negative cable. Users should program the ecm through the service programming system before ending the ignition sequence for at least five seconds. To finish execute the idle learn procedure while clearing all dtcs through the scan tool.