Some 2008-10 GM pickup trucks and SUVs can produce a buzzing or rattling sound under light acceleration, usually in the lower rpm range. One likely cause of the noise, reports General Motors, is the fuel line bracket above the transmission making contact with the floor pan. Bending the bracket away from the floor is the simple remedy.
Trucks that are prone to the condition are Cadillac Escalades; Chevy Avalanches, Silverados, Suburbans and Tahoes; and GMC Sierras, Sierra Denalis, Yukons, Yukon Denalis, Yukon XLs and Yukon Denali XLs.
Some 2007 Ford Edge and Lincoln MKX models with front wheel drive systems built before June 1, 2007, may turn on the antilock brake (ABS) and/or electronic stability control (ESC) warning lamp on the instrument panel.
According to Ford, if trouble codes C1165/C1175 and/or C1235/C1236 are the only codes stored in the ABS module, one or both rear ABS sensors are the likely source of the trouble. Installing new-design speed sensors, part No. 7T4Z-2C216-AA (right side); part No. 7T4Z-2C190-AA (left side) should eliminate the condition.
Drivers of 2008-09 xD models with 2ZR-FE four cylinder engines may complain of a coolant leak from the front portion of the engine. Scion says the leak may be accompanied by a screeching or rubbing sound, and is most likely the result of a manufacturing defect in the OE water pump. A new-design, upgraded pump, part No. 16100-39466, is now available to put the leakage issue to rest.
"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 e-mail at [email protected]