General Motors
Some 2006 Saturn ION models with 2.2-liter engines built before VIN breakpoint 6Z152773 may turn on the Check Engine light and store one or more of the following trouble codes in computer memory: P0128, P0326, P0420, P0604, P0717 and P2431.
According to GM, it's rare that any drivability symptoms will be present when the light comes on, and it attributes the condition to software anomalies in the PCM. Reprogramming the module with updated software is the only fix. Check with a dealer for the specifics of the flash.
Chrysler
Some 2008-09 Chrysler 300 and Dodge Magnum and Charger models, as well as 2009 Dodge Challengers with 2.7-liter or 3.5-liter engines may illuminate the Check Engine light and log crank sensor trouble code P0339 in PCM memory.
Chrysler reports that no symptoms will be present when the crank sensor code stores, and it may be accompanied by additional codes, such as P0300, P1128 and/or P1129. Insufficient clearance between the crank sensor and flexplate is the likely cause of the trouble. Installing a special washer, part No. 68061031AA, between the crank sensor fastener bushing and transmission should eliminate the condition.
After the washer is installed, perform four consecutive wide open throttle 1-2 shifts, making sure the engine reaches at least 5,800 rpm each time. If the Check Engine light stays off, the fix is complete. If the light comes back on and the P0339 code resets, replace the flexplate with an improved unit, part No. 04736299AC.
Lexus
Drivers of 2003-04 GX 470 trucks may complain of height control system troubles and an illuminated or flashing Check Engine light, with trouble code C1735 stored in the suspension computer. One probable cause for all these symptoms, reports Lexus, is water entering the height control compressor's exhaust solenoid valve. The only remedy is to replace the entire compressor with an improved component, part No. 48910-60020. After the new compressor is installed, clear the trouble code and make sure the height control system functions properly.
"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]