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Fixes for Jeep Wrangler 2007 - 2014 (JK)

Vehicle:  2007 (JK) Jeep Wrangler

Concern:  Intermittent no start. Better description is NO CRANK. A clicking noise may be heard. Engine will later crank and start. Condition is intermittent.

Cause:  Insufficient ground.

Resolution:  Add a 10 gauge black wire from battery negative terminal to the engine. A good/easy place to connect it is the top alternator mounting bolt.

Details:  -


Vehicle:  2007 (JK) Jeep Wrangler

Concern:  Speed control (cruise control) is inoperative.

Cause:  Speed control switch (small stalk on steering wheel, right side) is faulty.

Resolution:  Replace the speed control switch to correct.

Details:  -


Vehicle:  2007 (JK) Jeep Wrangler

Concern:  Front wipers operate but will not stop in the 'park' position. In other words, the wipers will stop in any position on the windshield when the wiper switch is turned off. Related symptom: wipers operate on low speed when the switch is in the 'intermittent' position.

Cause:  The park switch inside the wiper motor is faulty.

Resolution:  Replace the front wiper motor to correct.

Details:  -


Vehicle:  2007 (JK) Jeep Wrangler

Concern:  The interior lights will not turn on using the collar switch on the left multifunction stalk. The interior lights do come on when a door is opened. Related symptom: the instrument cluster backlighting is not dimmable using the collar switch on the left stalk. When the headlamps are on, the backlighting is at full brightness and cannot be adjusted.

Cause:  The left stalk multifunction switch is defective.

Resolution:  Replace the left stalk multifunction switch to correct.

Details:  -


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.

Cause:  -

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.


Vehicle:  2007 - 2014 Jeep Wrangler Hardtop (JK)

Concern:  Leaking door seal. Seal at the on the forward diagonal section near the top is not seated properly. Water leaking into interior and pooling in floorboard. Wet carpet.

Cause:  Bad factory seals (or bad installation of top)

Resolution:  Some dealers are replacing seals under warranty.

Details:  Some owners are reporting (on forums) that taking more care when re-installing the top has addressed the issue. Follow the proper procedure for installation and check for rubber gaskets and seals that are out of position.


Vehicle:  2006 -2007 Jeep Wrangler (TJ)(JK) with manual transmission (NSG370)

Concern:  Customers report a squeal-like sound while clutch out. Appears to be coming from transmission. Squeal stops when clutch is depressed.

Cause:  Incorrect pre-load on clutch throw-out bearing.

Resolution:  There is a TSB (06-002-07) for this issue. On the TJ - replace the Rod and Clutch Slave Cylinder Actuator. On the JK - replace the Washer, Spacer, Lubricant (Mopar Manual Transmission MS-9224), Adhesive, Stud N' Bearing Mount, and the Throw-out Bearing.

Details:  TSB #06-002-07


Vehicle:  2007 - 2011 Jeep Wrangler (JK) with 3.8L

Concern:  Excessive engine oil consumption.

Cause:  Many possible causes. Owner reports include many anecdotal causes. Some major - like cracked heads, but a bad PCV valve seems to be a common issue. There are also reports of some of the 3.8s built in Mexico having piston rings installed incorrectly.

Resolution:  Depends on issue causing oil consumption. Replace the PCV valve. Using a heavier oil (5w-30) has also helped some owners. Make sure to check oil at every fuel fill-up.

Details:  Some frustrated owners have started a petition: http://www.ipetitions.com/petition/oilburningjeepwrangler


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