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Home >> GMC >> 1997 >> Forward Control 4.3 W, L35, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Controls - Tests W/Codes - 6.5L Diesel (P Series)) >> Diagnostic Trouble Codes >> DTC P0380 - Glow Plug Circuit Performance >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different variant/trim than selected.

Check for proper operation of glow plugs if glow plug relay is stuck on. When glow plugs are commanded on by scan tool, an internal PCM timer protects glow plugs from damage by cycling them on for 3 seconds then off for 12 seconds.

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