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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 87 (Engine Controls - Self-Diagnostics - 6.6L Diesel) >> Diagnostic Tests >> DTC P0380: Glow Plug Circuit Performance (Ca) >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers in the diagnostic procedures.

  1. 4

    This step will determine if DTC P0380 is a hard failure.

  2. 5

    This step will determine if there is a short to voltage on the signal circuit.

  3. 9

    This step will determine if there is ignition voltage at the glow plug relay.

  4. 11

    This step will determine if the glow plug control circuit and ECM are working properly.

  5. 12

    This step will determine if there is a short to voltage on the relay control circuit.

  6. 14

    This step will determine if the glow plugs or the glow plug harness is causing the DTC P0380.
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