Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSCHEVROLET1996TAHOE 2D UTILITY, 6.5 SREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - TESTS W/CODES - 6.5L DIESELDIAGNOSTIC TROUBLE CODESDTC P0380 - GLOW PLUG CIRCUIT PERFORMANCEDIAGNOSTIC AIDS

1996 Chevrolet Tahoe 2D Utility, 6.5 S

Diagnostic Aids

1996 Chevrolet Tahoe 2D Utility, 6.5 SSECTION Diagnostic Aids

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.

Fig 1: DTC P0380 Schematic

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.