Symptoms: CEL illuminates, and engine may be restricted to 3,500 RPM (Limp Mode) to protect bearings from low oil pressure.

Root Cause: The 3.6L Pentastar uses a variable displacement oil pump. P06DD triggers when high pressure is commanded but not achieved. The most common cause is installing a 2014+ flat-bottom oil filter into a 2012-2013 housing, keeping the bypass valve open. If the filter is correct, the dual-stage oil pump solenoid has mechanically failed.

Repair Procedure: Verify filter compatibility. If correct, drop the engine oil pan and replace the oil pump solenoid or the entire pump assembly.

Symptoms: Oil pressure gauge on the EVIC reads a pegged 99 PSI or fluctuates wildly regardless of RPM.

Root Cause: Internal electrical failure of the oil pressure sensor due to extreme heat cycles in the engine valley.

Repair Procedure: The sensor is threaded into the rear of the oil filter housing. Access requires removing the upper and lower intake manifolds. It is highly recommended to replace the entire Oil Cooler Housing with an aluminum upgrade during this job.

Symptoms: Loud, rhythmic sewing-machine metallic tapping from the cylinder head, accompanied by Random Misfire (P0300) or P0302/P0304/P0306 codes on Bank 2.

Root Cause: Collapse of the needle bearings inside the roller rocker arms. The seized roller grinds directly against the rotating camshaft lobe, scoring it flat.

Repair Procedure: Remove upper/lower intake manifolds and valve covers. Replace all 24 rocker arms and hydraulic lifters using updated Mopar OEM revisions. Replace camshaft if scored.

Symptoms: Massive oil leak running down the back of the engine bellhousing. Often misdiagnosed as a rear main seal leak.

Root Cause: The factory oil filter housing is plastic. Thermal fatigue and overtightening the oil filter cap (past 18 ft-lbs) cracks the base.

Repair Procedure: Remove intake plenums. Replace the factory plastic unit with an all-aluminum Dorman upgrade. Replace upper and lower intake gaskets.

Symptoms: Transmission locks into 2nd gear (Limp Mode), harsh shifting, P0700/P0750 codes.

Root Cause: The internal plastic conductor plate speed sensors fail electrically due to fluid contamination or heat.

Repair: Drop the transmission pan, remove the valve body, and replace the conductor plate. Refill with ATF+4.

Symptoms: Dashboard ‘Hot Oil’ chime while off-roading, ATF+4 boiling out of the dipstick tube.

Root Cause: Driving off-road in 4-High prevents the torque converter from locking up, generating massive friction heat.

Repair: Always off-road in 4-Low. Install an aftermarket auxiliary transmission cooler.

Yes, a Dana 30 handles 35s on the street. However, the true weakness of the JK Dana 30 is not the smaller ring gear, but the C-knuckles. Because the Rubicon Dana 44 uses the exact same C-knuckles, BOTH axles require welded C-Gussets to safely handle 35-inch tires off-road.

Diagnosis (Dry Steering Test): Leave tires on ground, engine running. Have a helper aggressively turn the steering wheel 10-to-2. Inspect front track bar mounts, tie rod ends, and drag link. Look for lateral movement.

Root Cause: Jeep used 14mm fully-threaded bolts inside 9/16-inch track bar bracket holes. The sizing gap allows micro-movements that oval out the brackets.

Repair: Install a 9/16-inch Grade 8 shouldered bolt kit. Torque to 125 ft-lbs with vehicle weight on the ground. Replace worn ball joints.

Symptoms: Steering wander, memory steer, clunking over bumps, and inability to hold an alignment.

Root Cause: Factory JK ball joints use nylon plastic internals that crush under the weight of 33-inch+ tires.

Repair: Use a heavy-duty press to remove factory joints. Install greasable, metal-on-metal aftermarket joints (Synergy, Teraflex).

Symptoms: Engine cranks strongly but won’t start, or stalls on the highway.

Diagnosis: Bridge the M37 fuse to the M25 fuse inside the TIPM. If the fuel pump engages and the engine starts, the internal relay is dead.

Repair: Install a permanent external TIPM bypass relay cable, or send the TIPM to a specialist to have a heavy-duty relay soldered onto the logic board.

Symptoms: Airbag, ABS, and Traction Control lights illuminate. Horn stops working.

Root Cause: Ribbon cable inside the steering column snaps, severing connection to the airbag and Steering Angle Sensor (SAS).

Repair: Disconnect battery for 30 mins to disarm airbag. Remove steering wheel and replace clockspring.

To safely clear 35×12.50 tires, you need a minimum 2.5-inch suspension lift and an effective wheel backspacing of 4.5 inches. If keeping factory wheels, use high-quality 1.5-inch hub-centric spacers (remove factory rotor retaining clips before install).

Importance: Failing to reprogram the PCM for larger tires on an automatic JK will ruin shift points, prevent overdrive, and trigger Limp Mode.

Procedure: Use a Bluetooth OBD2 reader and the JScan app. Navigate to TIPM -> Tire Size. Input the physically measured height of the tire under vehicle weight.

Component	Torque Spec
Front Track Bar (Axle & Frame)	125 ft-lbs
Lower Control Arm Bolts	125 ft-lbs
Tie Rod Ends	63 ft-lbs
Upper / Lower Ball Joints	70 ft-lbs / 80 ft-lbs
Wheel Lug Nuts	100 ft-lbs (Star Pattern)
Oil Filter Cap (3.6L)	18 ft-lbs (Do not exceed)

System	Fluid Type	Capacity
Engine Oil (3.6L/3.8L)	5W-20 Synthetic	6.0 Quarts
Transfer Case (NV241)	ATF+4	2.0 Quarts
Front Diff (D30/D44)	80W-90 GL-5	1.35 Quarts
Coolant (2013-2018)	OAT (Purple)	10.5 Quarts

• Spark Plugs: FSM specifies replacement at 100k. Requires removing upper intake manifold on the 3.6L.
• Oil Cooler Housing: Plastic embrittlement peaks around this mileage. Upgrading to the Dorman aluminum cooler is critical.
• Suspension Bushings: Track bar and control arm bushings degrade, increasing the risk of Death Wobble.

• Rocker Arms (3.6L): Needle bearing collapse becomes highly probable. Listen for the Pentastar Tick.
• TIPM: Internal fuel pump relay burnout occurs frequently due to age.
• Radiator: Factory radiators develop pinhole leaks where the plastic side tanks crimp to the aluminum core.