Chrysler Some 2008-09 Jeep Grand Cher-okees with 6.1L engines and automatic transmissions may idle roughly on cold startup. In many cases, Chrysler Group L.L.C. said, the check engine light will also be on, with trouble code P050D stored in computer memory.
If normal troubleshooting fails to reveal the cause of the problems, a glitch in the PCM software is the likely culprit. Reprogramming the module with an updated calibration is the only reliable fix, the firm said.
Check with a dealer for the application specifics of the software upgrade.
Toyota Some 2007-2008 Tundra pickups and 2008 Sequoia SUVs may emit a squealing or chirping sound from under the hood on initial startup in the morning or following a prolonged soaking rain. Toyota Motor Corp. attributed the noise to the rubber formulation in the accessory drive belt.
A new-design drive belt with a different rubber compound, part No. 90916-02680, is available to address the noise issue. c c c Toyota said 2004-2008 Prius models may produce a metallic knock or clunk from under the hood when driven over speed bumps or extremely rough roads.
One probable cause for the noise, the car maker said, is a bad left-side engine mount insulator, which is actually attached to the transaxle of the hybrid. Installing an improved mount, part No. 12372-21111, should eliminate further noise issues.
“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 tech. His column provides vehicle manufacturers' authentic factory technical service bulletins (TSBs) that have been condensed for easier reading. He can be reached via e-mail at [email protected] For more Factory Fixes, go to www.tirebusiness.com and click on the Service Zone icon.