OEM Buick Rainier Engine Control Module

Buick Rainier Engine Control Module Parts and Q&A

• PCM
  12596679
  Q: How to replace the Engine Control Module on Buick Rainier?

  A:

  The percentage of engine oil life must be retrieved through a scan tool before powertrain control module (PCM) replacement. Remove the pcm harness connectors from the pcm only after turning off the ignition to protect internal components and easing the pcm harness connector bolts. The pcm removal process starts with removing its retaining bolts and nuts before gently moving the pcm away from the Intake Manifold over the mounting studs to take it out of the vehicle. Mounting studs need replacement then you must install them to the Intake Manifold and tighten them at 6 n.m (53 lb in). The mounting studs accept the pcm and you should fasten it using retaining bolts and nuts which require a torque of 8 n.m (71 lb in). Secure the pcm harness connectors to their body while tightening retaining bolts to 8 n.m (71 lb in). The last step involves programming the new pcm because failure to set the existing oil life will cause an automatic 100 percent reset requiring an oil change within 5000 km (3,000 mi) since the previous change.
• PCM
  12678511
  Q: What does the service of the engine control module (ECM) typically involve on Buick Rainier?

  A:

  The service of powertrain control modules (Pcm) requires the replacement of either the pcm unit or eeprom electrically erasable programming through a memory read-only technique. A correct part inspection must be performed on the pcm prior to its replacement. The faulty pcm needs replacement and you should install the new service pcm. You should always switch off the ignition before handling control module connectors and disconnecting or reconnecting power because it protects internal components from breaking. Service personnel must avoid letting the pcm metal housing come near battery voltage and must not contact solder joints or pins to prevent electrostatic damage. Examine the connection point of the control module to remove dirt before checking that the gasket seals properly to avoid contaminant access. The replacement control module requires programming and engine oil remaining life monitoring so engineers can prevent default engines to 100 percent and subsequent 5,000 km (3,000 mi) oil change from the last service. A secure scan tool should be used before disconnecting the pcm harness connectors to retrieve the engine oil life and loosen the pcm harness connector bolts with the ignition off. The vehicle owner needs to remove the pcm retaining bolts with nuts then slide the pcm forward from the intake manifold studs before extracting the pcm from its position. To change the studs it is necessary to remove the pcm mounting studs from the intake manifold. During installation replace the mounting studs onto the intake manifold before tightening them to 6 N.m (53 lb in). Samsung the pcm to its mount position by setting it on the mounting studs then attach the retaining hardware and nut fasteners with a torque of 8 N.m (71 lb in). Attach the pcm harness connectors to their body sections while tightening retaining bolts to 8 N.m (71 lb in). The installation of any new pcm requires programming of the system.