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HOMESERVICE MANUALSCHEVROLET2018SILVERADO 2500 HD WT, 2D PICKUP, 6.0L ENG VIN G, RWD, GASREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 2847 (ENGINE CONTROLS AND FUEL - 6.6L (L5P) - REPAIR INSTRUCTIONS)REPAIR INSTRUCTIONSENGINE CONTROL MODULE REPLACEMENT
2018 Chevrolet Silverado 2500 HD WT, 2D Pickup, 6.0L Eng VIN G, RWD, Gas

Engine Control Module Replacement

2018 Chevrolet Silverado 2500 HD WT, 2D Pickup, 6.0L Eng VIN G, RWD, GasSECTION Engine Control Module Replacement
WARNING: This page is about a different car, the 2017 GMC Sierra 3500 HD, 2017 GMC Sierra 2500 HD, 2017 Chevrolet Silverado 3500 HD, and 2017 Chevrolet Silverado 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Engine Control Module
GM4543809Courtesy of GENERAL MOTORS COMPANY
Callout Component Name
Preliminary Procedure 
Disconnect the battery negative cable. Battery Negative Cable Disconnection and Connection (Dual Battery)Battery Negative Cable Disconnection and Connection (L5P)
1 Engine Control Module
CAUTION:
  • Turn the ignition OFF when installing or removing the control module connectors and disconnecting or reconnecting the power to the control module (battery cable, powertrain control module (PCM)/engine control module (ECM)/transaxle control module (TCM) pigtail, control module fuse, jumper cables, etc.) in order to prevent internal control module damage.
  • Control module damage may result when the metal case contacts battery voltage. DO NOT contact the control module metal case with battery voltage when servicing a control module, using battery booster cables, or when charging the vehicle battery.
  • In order to prevent any possible electrostatic discharge damage to the control module, do no touch the connector pins or the soldered components on the circuit board.
  • Remove any debris from around the control module connector surfaces before servicing the control module. Inspect the control module connector gaskets when diagnosing or replacing the control module. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the control module.
  • The replacement control module must be programmed.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.