Bulletin No.: 08-08-49-001
Date: February 05, 2008
with 2.8L or 3.6L Engine (VINS T, 7 - RPOs LP1, LY7)
Some customers may comment that the fuel gage reads empty when there is fuel in the tank. Also, the driver information center may display the "Fuel Level Low" message.
A scan tool may reveal DTC P2066 set in the ECM.
An issue with the ECM software has been identified that will cause the ECM to increment the fuel used incorrectly if the vehicle is driven for a number of short trips with frequent key cycles between refueling events.
If routine diagnosis using SI does not reveal any obvious cause, then reprogram the ECM with updated calibration files using the TIS2WEB Service Programming System (SPS) application.
Bulletin No.: 04-06-04-077A
Date: November 01, 2005
This bulletin is being revised to add VIN Breakpoints for each model. Please discard Corporate Bulletin Number 04-06-04-077 (Section 06 - Engine/Propulsion System).
Built Prior to the VIN Breakpoints shown.
Some customers may comment on an inaccurate fuel level gauge reading. In a small number of cases, the vehicle ran out of fuel when the gauge still indicated 1/8 tank.
The cause of this condition may be insufficient fuel transfer from the left fuel reservoir to the right fuel reservoir. The poor fuel transfer may be the result of one or a combination of both of the following:
Follow published diagnostics for any stored diagnostic trouble codes (DTC) or use the diagnosis information for fuel gauge inaccuracy (SI Document). If the diagnosis leads you inside the fuel tank, determine if the vehicle came in an as-failed condition; pay particular attention to the quantity of fuel in the left and right reservoirs as the tank is lowered from the vehicle. Fuel remaining in the left reservoir and no fuel in the right reservoir is a good indication of poor fuel transfer. If the vehicle is not in a failed condition, it may be necessary to run the vehicle out of fuel to duplicate the concern.
Replace the sender fuel feed (transfer) pipe with P/N 10388380. This new pipe has one anti-siphon hole. Also, inspect the RH primary fuel tank module for a clogged/restricted transfer (jet) pump. Use the procedure listed below: