OEM GMC Sierra 3500 Engine Control Module

GMC Sierra 3500 Engine Control Module Parts and Q&A

• ECM
  12602801
  Q: What does the service of the Engine Control Module (ECM) involve on GMC Sierra 3500?

  A:

  The service procedure for the pcm control involves replacing the component or executing eeprom operations. When it becomes necessary to replace the pcm always select the appropriate part before uninstalling the faulty module to install a new service pcm. Internal pcm damage will happen when turning off the ignition switch before connecting or disconnecting power to the pcm and clear all debris from the pcm connector surfaces. Maintaining proper connection of pcm module connector gaskets will help stop contaminants from entering the system. Use a scan tool to obtain the engine oil life percentage before removal because a failure to program the new module with this data through default mode will activate a 100% oil life condition which triggers a required oil change at 5000 km (3,000 mi) from the last change. Before work begins disconnect the negative Battery Cable except when using rpo nys which requires removal of the harness ground clip while rpo hp2 demands the removal of the hybrid control module (HCM). Vehicles without rpo hp2 need to start with unhooking the pcm cover mounting tabs before separating the cover from its bracket while removing the cover. Users should perform the identical cover removal steps for vehicles that have rpo hp2 specification. The process starts by removing the pcm electrical connector bolts when the ignition is off to avoid damage followed by disconnecting pcm electrical connectors and releasing the spring latch before extracting the pcm through the mounting tabs. Safely mount the new pcm through its tabs before locking the spring mechanism while connecting electrical cables by tightening the bolts to 8 n.m (71 lb in). Install the pcm cover after which installing the hcm if the vehicle includes rpo hp2. The negative Battery Cable needs to be reconnected after which pcm programming should be performed in case of new unit installation.
• ECM
  15292913
  Q: How to replace the Engine Control Module on GMC Sierra 3500?

  A:

  A replacement of the powertrain control module (PCM) requires the Ignition Switch to be turned off in order to protect the internal components. Check the pcm connector gaskets for proper installation because they are essential to blocking contaminants. Clean all debris from the pcm connector areas. The new pcm needs programming as a key step before installation. A compatible scan tool should be used to obtain and save the engine oil life percentage before programming because an unprogrammed value defaults to 100% which requires an oil change at 5000 km (3,000 mi) from the last service. As a first step disconnect the negative Battery Cable and also remove the engine harness clip from the pcm cover when the vehicle features the allison transmission regular production option (M74). After releasing the pcm cover mounting tabs you can take out the cover itself. The pcm electrical connector bolts need to be loosened while the ignition is off to prevent connector damage when connecting or disconnecting the pcm to its connector. You should disconnect pcm electrical connectors before you release the spring latch and mounting tabs to remove the pcm. When installing the new pcm users should secure its mounting tabs while tightening the spring latch at the same time followed by electrical connector connection before securing the bolts with a torque of 8 n.m (71 lb in). The installation requires reconnecting the negative Battery Cable and applying pcm programming when a new unit was installed.