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Diagnostic Aids

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: When inspecting for a deformed or warped fuel tank, measure the resistance of the suspect fuel level sensor at empty, with the sensor in the fuel tank, and again with the sensor removed from the fuel tank. The measured resistance values should be the same at empty. If the measured values are not the same, refer to Fuel Tank Replacement (Right) or Fuel Tank Replacement (Left) in Engine Controls.

Depending on the current fuel level, it may be difficult to locate a malfunctioning sending unit. The malfunction may only occur when the fuel level is full or near empty. The fuel sending unit may need to be removed for further diagnosis. A fuel level sensor that has an intermittent condition causes this DTC to set. Remove the fuel level sensor. Refer to Fuel Sender Assembly Replacement (RH) or Fuel Sender Assembly Replacement (LH) in Engine Controls in order to test the resistance of the sensor. The resistance of the sensor should change from 40 to 250 ohms. Replace the sensor if the resistance did not change or was out of range.

DTC P2066

Step Action Values Yes No
Schematic Reference: Instrument Cluster Schematics 
1 Did you perform the IPC Diagnostic System Check? - Go to Step 2  Go to Diagnostic System Check - Instrument Cluster 
2
  1. Connect a scan tool, record the left/primary and right/secondary fuel level sensor voltages in the powertrain control module (PCM) data list.
  2. Remove 5 gallons of fuel. Refer to Fuel Tank Draining Procedure in Engine Controls.
  3. Record the voltage on the left/primary and right/secondary fuel level sensors.
  4. Start the engine, let the engine idle for 20 minutes.
Did the voltage increase on the left/primary fuel level sensor and decrease on the right/secondary fuel level sensor after 20 minutes?		 - Go to Step 4  Go to Step 3 
3 Remove the right/secondary fuel tank. Refer to Fuel Tank Replacement (Right) or Fuel Tank Replacement (Left) in Engine Controls - 5.7L.
Is there any fuel in the right/secondary fuel tank?		 - Go to Fuel System Diagnosis in Engine Controls - 5.7L Go to Step 4 
4
  1. Remove the right/secondary fuel level sensor. Refer to Fuel Level Sensor Replacement - Right in Engine Controls - 5.7L.
  2. Inspect for the following items:
    • The fuel level sensor is stuck, perhaps due to an interface with the fuel strainer.
    • The fuel tank contains foreign material, for instance, ice.
    • Warped fuel tank.
Did you find and correct the condition?		 - Go to Step 7  Go to Step 5  -
5
  1. With the DMM, measure the resistance of the fuel level sensor while moving the float arm.
  2. Observe both the analog and digital displays on the DMM.
Does the resistance change smoothly across the specified range?		 40-250Ω Go to Diagnostic Aids Go to Step 6 
6 Replace the right/secondary fuel sensor. Refer to Fuel Level Sensor Replacement - Right in Engine Control - 5.7L.
Did you complete the replacement?		 - Go to Step 7  -
7
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the conditions for running the DTC.
Does the DTC reset?		 - Go to Step 2  System OK
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