What is PCM B fuse?
The Fuse for the PCM B (20 AMP) feeds Power to the Contacts of the Fuel Pump Relay, and to the Coil of the EDU Relay, along with Voltages supplied to the Engine Control Module (ECM) as Inputs to ECM, and Power to the Transmission Control Module (TCM).
What is the ENG 1 fuse?
the eng-1 fuse covers almost every emission control device that you have on the vehicle. that means it is going to be a true pain to locate.
Where is the fuse box on a 2003 GMC Sierra?
The underhood fuse block in the engine compartment on the driver’s side of the vehicle near the battery.