Drivers of 2004-06 Cadillac SRX, 2004-07 CTS or 2005-07 STS models with 2.8-liter or 3.6-liter engines may come into your store with a complaint that their fuel gauge reads empty even though gasoline remains in the tank.
According to GM, the inaccurate gauge reading may be accompanied by a "Fuel Level Low" message on the driver information center, and in some cases, an illuminated Check Engine light with trouble code P2066 stored in PCM memory.
One likely cause for the trouble is the PCM incorrectly incrementing to the trip computer the amount of fuel used, especially during short trips with frequent key cycles between tank fill-ups. Reprogramming the module with updated software is the only reliable fix.
Check with a dealer for the specifics of the flash.
"Factory Fixes" is written by Jim DePalma, a 30-year veteran of the auto repair business who has served stints as a service manager, parts manager and ASE-certified technician. His column provides vehicle manufacturers' authentic factory technical service bulletins (TSBs) that have been condensed for easier reading. Mr. DePalma advises that techs always check with a dealer or repair information system for the latest revisions before starting to work on a vehicle. He can be reached via email at [email protected].