null Skip to main content
Image 0

Glow Plug Controller, LB7 Duramax Federal Emissions | 2001 - 2004

GM

$275.93
SKU:
97371491
Adding to cart… The item has been added

The glow plug controller on federal emissions LB7 Duramax engines switches battery power from the 175 amp glow plug fuse to the glow plug rails and the intake air heater when the ECM calls for preheat. This is GM 97371491, the federal emissions controller for 2001-2004 Chevy Silverado and GMC Sierra 2500HD and 3500HD trucks with the 6.6L Duramax LB7. It has both relays: one for the glow plugs and one for the intake air heater.

Features

  • GM 97371491 glow plug controller (GPCM)
  • Has both relays, glow plug and intake air heater
  • For federal emissions LB7 engines

What's Included

  • (1) Glow plug controller

When to Replace

A failed controller can leave the glow plugs without power, which can cause hard starts in cold weather. Owners on the DuramaxDiesels forum describe the federal unit as relay based and report that the relays inside can fail after a few years. Before replacing the controller, they recommend confirming 12 volts at the 175 amp fuse and at the controller input, then checking for 12 volts at the glow plug output with the key on and the glow plug light on. Also check the glow plug rails, since corroded rails can disable the glow plugs downstream of the break.

Before You Order

  • Federal emissions LB7 only. California emissions LB7 trucks use a different, solid state controller.
  • 2001-2004 LB7 only. For 2004.5-2005 LLY trucks, see the Glow Plug Controller, 2004.5-2005.

Related Parts

Frequently Asked Questions

Does this controller include the relays?
Yes. It has both relays.

Will this fit a California emissions LB7?
No. This is the federal emissions controller. California emissions trucks use a different glow plug system.

For warranty information, see our Warranty Policy.

!