Diagnostic Procedure

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: DTC P0380:Glow Plug Circuit Performance - California RPO YF5, NE1 (Steps 1-12)

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Fig 2: DTC P0380: Glow Plug Circuit Performance - California RPO YF5, NE1 (Steps 13-23)

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Fig 3: DTC P0380: Glow Plug Circuit Performance - California RPO YF5, NE1 (Steps 24-31)

Courtesy of GENERAL MOTORS CORP.