Vehicle: All vehicles (TJ) (WJ) (RS) (XK) (WK) (RS)
Concern: Loud noise/vibration from interior fan (for A/C heat)(HVAC) especially when on high speed, usually speed 3 or 4.
Cause: HVAC fan (blower motor) is out of balance. Usually caused by fan sucking in leaves or other debris.
Resolution: Remove the blower motor and inspect/clean the fan blade (squirrel cage type). Normally the blower motor is located under the passenger side dash. Most are easy to remove, held in with 3 screws, either Phillps or T20 torx.
Vehicle: All vehicles equipped with electronic stability control (WK) (XK) (LX)
Concern: ABS/ESP/BAS light is on.
Cause: First thing to check for is an alignment problem. Test drive the vehicle and check if the steering wheel is straight when the vehicle is going straight.
Resolution: If steering wheel is turned left or right while driving straight, the vehicle needs an alignment. Perform an alignment then test drive. The warning light should turn off.
Details: The stability control computer measures steering angle and degrees per second of steering wheel rotation. When it sees steering angle greater than or less than -0-, but the yaw sensor is not sensing a turn, a rationality fault is set and the ABS/ESP/BAS light will be on.
Vehicle: All late model Chrysler, Jeep, and Dodge vehicles (PT) (LX) (WK) (XK)
Concern: No start. The engine does not crank or start. When key is turned to the 'start' position, nothing happens. Battery is NOT dead.
Cause: The immobilizer module is electrically 'locked up' or is otherwise non-responsive.
Resolution: Disconnect the battery for a few minutes, then reconnect the battery and retest. If the engine now will start, the immobilizer module may need to be replaced.
Details: The immobilizer module is located very close to where the key goes into the ignition lock cylinder. The immobilizer module has several names, depending on year/model: SKIM, SKREEM, WIN. Vehicles with a WIN also have a FOBIK type remote (no key).
Vehicle: Most Chrysler/Jeep/Dodge vehicles, 2005 and newer (WK) (XK) (LX) (PT)
Concern: The clock (on the radio) is incorrect. What is the procedure to set the clock?
Resolution: 1) Hold the 'time' button until the clock hours digits blink. 2) Turn the right radio knob to set the hour. 3) Press the right radio knob in to select minutes. 4) Turn the right radio knob to set minutes.
Details: Easy Squeezy Lemon Peazy!
Vehicle: 2005-up (WK) Jeep Grand Cerokee, 2005-up (LX) 300, 300C, Charger, etc. and others
Concern: Airbag light is on. Passenger 'airbag off' light may be on.
Cause: The passenger seat is out of calibration.
Resolution: Have your dealer calibrate the passenger seat.
Details: The passenger seat has a weight sensing system.
Vehicle: All vehicles. (JK)(ZJ)(CS)(JC)(TJ)(XJ)(PT)(KJ)(KK)(KA)(AN)(ND)(DR)(DS)(WJ)(WK)(XK)(LX)(LH)(FJ)(JR)(JS)(RT)(RS)(NS)
Concern: The MIL (check engine light) is on. The scan tool reveals DTC P0601 PCM internal controller failure.
Cause: The PCM (engine computer) has an internal fault.
Resolution: Replace the PCM to correct.
Details: This is an easy diagnosis. When P0601 is present, the solution is always to replace the PCM. There is no other possible cause. Normally the vehicle is still driveable.
Vehicle: All Chrysler, Jeep, and Dodge vehicles. (JK)(ZJ)(CS)(JC)(TJ)(XJ)(PT)(KJ)(KK)(KA)(AN)(ND)(DR)(DS)(WJ)(WK)(XK)(LX)(LH)(FJ)(JR)(JS)(RT)(RS)(NS)
Concern: Alternator failure. The alternator (generator) is not charging. Electrical problems.
Resolution: Hold on for a minute. Alternator failures are extremely rare on Chrysler, Jeep, and Dodge. You need to rule out the battery, wiring, and PCM first before replacing the alternator.
Details: The alternator is controlled by the PCM (engine computer). Again, true alternator failure is very rare. In ten years as a dealer service dept tech, I have replaced maybe five alternators.