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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 429 (Engine Controls Self-Diagnostics - 6.0L Bi-Fuel & CNG) >> Diagnostic Tests >> DTC P0148: Fuel Delivery Error >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 GMC Savana and 2003 Chevrolet Chevy Express. 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 procedure.

  1. 2

    This step determines if the condition is active. The Powertrain Control Module (PCM) grounds the Alternative Fuel (AF) enable circuit when operating on CNG.

  2. 4

    This step tests for a short to ground on the AF enable circuit. The test light should not illuminate with the ignition off.
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