Diagnostic Aids

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Ensure that the fuel level is in the same range as the customer concern.
For intermittent diagnosis, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Refer to Fuel Level Specifications in order to verify the correct fuel level sender readings. The fuel level is available on the scan tool in the Fuel Tank Level Remaining (%) parameter in the PCM Enhanced Evap Data list-gas only or in the Fuel Level Sensor (voltage) parameter in the Engine Data Fuel System display - 6.6L diesel only.