Owners of 2009-10 Jeep Compass and Patriot models with 2.4-liter engines and automatic transmissions may complain of a bump or jerk from the transmission under certain driving conditions.

Acura attributes the problem to the PCM misinterpreting the feedback signals from the electric vacuum pump. Flashing the module with new software is the only way to eliminate the condition. Check with ...

Ford says the problem can be resolved once dealers reprogram the PCM and update the software. The automaker hopes to also offer an over-the-air update that fixes the issue later in the year.