The fuel level sender changes resistance based on fuel level. The engine control module (ECM) monitors the signal circuit of the fuel level sender in order to determine fuel level. When the fuel tank is full, the sender resistance is low and the ECM senses a low signal voltage. When the fuel tank is empty, the sender resistance is high and the ECM senses a high signal voltage. The ECM uses the signal circuit of the fuel level sender in order to calculate the total remaining fuel percent in the tank. The ECM sends the fuel level percent via the serial data circuit to the instrument cluster in order to control the fuel gage.

This diagnostic tests for a stuck fuel level sender signal. The ECM sets this DTC if the fuel level sender signal appears to be stuck based on a lack of signal variation expected during normal operation.

The engine is running.

The ECM does not detect a change in fuel level of at least 3.0L (0.79 gal) over a distance of 320 km (200 mi).

Schematic Reference

Instrument Cluster Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Instrument Cluster Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

1. Ignition OFF, remove the fuel level sender and verify there are no obstructions interfering with the fuel level sender.

⇒	If any interference is present, repair the fuel sender interference.

2. Ignition OFF, disconnect the harness connector at the fuel level sensor.
3. While sweeping the fuel level sensor through its full range of motion, test for a minimum resistance value of less than 41 ohms and a maximum value greater than 119 ohms between the signal terminal C and the low reference terminal B.

⇒	If not within the specified range, replace the fuel level sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.