OEM GMC Sierra 3500 Classic Engine Control Module

GMC Sierra 3500 Classic Engine Control Module Parts Questions & Experts Answers

• ECM
  12602801
  Q: How to service the Engine Control Module (ECM) on GMC Sierra 3500 Classic?

  A: Replacing or programming the Engine Control Module's (ECM) electrically erasable programmable read-only memory (EEPROM) will service the system. Make sure to acquire a genuine ecm part before taking out the damaged module and swapping it with the new service ecm. Power loss from the ignition along with handling of control module connectors must always remain off because this keeps internal damage from occurring. The metal case of the control module must not touch battery voltage since this could harm the control module. Maintain safety against electrostatic discharge through avoiding touch of pins and circuit board components on the board and clearing contamination from connector surfaces. Regular checks of control module connector gaskets should focus on their proper installation to block contaminant entry. The new control module programming process includes tracking the engine oil lifetime percentage correctly because disregarding this step sets oil change requirements to 5,000 km (3,000 mi) following the previous change. The first step for removal involves using a scan tool to obtain and document engine oil life percentage before disconnecting the negative Battery Cable. Start by removing the ecm connectors through disconnecting their upper and lower electrical connector retainers then disconnecting the ecm from its bracket by releasing the retainer tabs. To install the bottom ecm tabs mount into the bracket before pushing the ecm until it locks into place. Fasten the lower electrical connector with its retainer before setting the upper electrical connection in place with its intended retainer. Reinstall the negative Battery Cable. Installation of a new ecm requires proper ecm programming before implementation.