545RFE Grand Cherokee Common Problems and Fixes

The 2005-2010 Grand Cherokee (the WK body, built alongside the Commander) is the Jeep most shops see with a 545RFE in it. A lot of them spent their lives towing, and the V8 trucks carry the same five-speed RFE used in the Ram 1500 and Durango of the era, so the failure list is familiar: switch valve wear, burnt overdrive clutches, P0882 limp mode, loss of prime after a sloppy service, and the fluid mistakes that start most of it. The Grand Cherokee adds one wrinkle that sends more of these to the wrong shop than anything else: half the WK lineup does not have a 545RFE at all.

Here is the order we work them in, with factory specs and scan tool checks. For the chassis-neutral rundown, see our 45RFE and 545RFE problems write-up.

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545RFE Transmission Solenoid Pack and Filter Kit

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45RFE / 545RFE / 65RFE Master Rebuild Kit with 4WD Filter

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First: Confirm Which Transmission You Have

Do not order parts off "Grand Cherokee" and a model year. Chrysler's own 2007 WK service information splits the transmission procedures by engine. The 545RFE Quick Learn procedure is titled for 4.7L and 5.7L vehicles, while the adaptation procedure for the 3.7L gas and 3.0L diesel trucks belongs to the W5J400, the Mercedes-built five-speed most shops call the NAG1 (Chrysler WK service information).

They also fail differently:

• 545RFE (4.7L, 5.7L): the PCM runs it through a transmission control relay. In limp-in it falls back to hydraulic default and pulls away in second.
• NAG1 / W5J400 (3.7L, 3.0L CRD): separate TCM, no relay. Per Chrysler it holds the current gear when a DTC sets, then goes to mechanical second after a key cycle.

One more reason to confirm it: NHTSA recall 05V-396 covers 3.7L Grand Cherokees with the NAG1, where A/C condensate can get into the transmission at the fill tube grommet and cause converter clutch shudder (NHTSA recall data). That is a V6 problem. Everything below is for the 545RFE trucks.

Problem 1: Wrong Fluid, Wrong Level, or a Botched Filter Job

Most 545RFE trouble on these Jeeps starts at the dipstick. Chrysler specifies Mopar ATF+4, says Dexron II is not recommended, and states that improper fluid can cause clutch chatter. It also says not to use additives or sealers, and that color and smell do not indicate fluid condition (Chrysler WK, Automatic Transmission Fluid).

The WK level check, per Chrysler (Fluid Level Check):

• Vehicle on level ground, selector in Park, engine idling at least one minute.
• At about 180 F (82 C) the level should be in the HOT cross-hatched area. At about 70 F it sits near the upper COLD hole.
• The true transmission oil temperature only reads on the scan tool in Reverse or a forward gear, so drop it into gear to read temperature, then go back to Park to check the stick.
• After adding fluid, wait at least two minutes for it to drain down the fill tube before rechecking.

Why it matters, per Chrysler: low fluid lets the pump take in air, so pressure is low and builds slowly. Overfill foams the fluid, which does the same thing and can push fluid out the vent where it looks like a leak.

Capacities for the WK 545RFE: 5.2 L (11 pints) service fill on 2WD, 6.2 L (13 pints) on 4WD, and 13.33 L (28 pints) dry fill after an overhaul (Chrysler WK, Fluid Capacities). Finish on the dipstick hot.

The filter job is where a lot of comebacks are born. Chrysler's caution is blunt: the primary oil filter seal must be installed fully flush in the oil pump body, not pushed onto the filter neck and installed as an assembly, or "damage to the transmission will result" (Fluid and Filter Replacement). Factory torques are 40 in-lb on the primary filter screw and 84 in-lb on the spin-on cooler return filter, where equipped. Our 545RFE filter and pan service guide covers the whole job.

Problem 2: No Movement or Delayed Engagement After a Service (P0944)

If the Jeep came in driving and now will not move, or takes several seconds to engage after a fluid service, assume the service until proven otherwise. The PCM runs a loss-of-prime test when the transmission slips in a forward gear and the pressure switches that should be closed read open; P0944 sets when none of them respond. Chrysler's possible-cause list for P0944, in its own order (P0944 Loss of Hydraulic Pump Prime):

1. Shift lever out of adjustment
2. Improper fluid level
3. Cracked or improperly installed primary oil filter or seal
4. Loose cooler return filter
5. Stuck or sticking main regulator valve
6. Transmission oil pump

The diagnostic works off line pressure: actual line pressure should match desired within plus or minus 5 psi in every range. Run the shift lever position test, then compare actual and desired line pressure in Drive and Reverse. Debris or a seal on the filter neck sends you to the filter; a clean pan sends you to the main regulator valve and the pump. Our 545RFE no movement diagnosis has the full flow.

Problem 3: Solenoid Switch Valve Wear (P0841, P0868, P0871, P1775/P1776)

This is the classic RFE valve body failure. Sonnax explains that the solenoid switch valve directs oil between the low/reverse clutch and the converter clutch, and that two shuttle plugs at the end of the bore also feed the 2nd and overdrive clutches. As the bore wears, oil cross-leaks between circuits that are supposed to be isolated. The results Sonnax lists: bind-up, codes 841, 868 and 871, the latched-valve codes 1775 and 1776, stalling, failsafe, and lockup complaints (Sonnax, "All in the Family").

P0868 is worth understanding because it gets blamed on the line pressure sensor far more often than it deserves. Per the WK service information, the pressure control solenoid regulates line pressure by duty cycle: 5% duty cycle is solenoid off and maximum pressure, 62% is solenoid on and minimum pressure. Line pressure is torque-based while driving and set to 120 or 135 psi during shifts and in Park and Neutral. P0868 sets when actual line pressure stays more than 15 psi below desired for 3.5 seconds in a forward gear (P0868 Line Pressure Low). Chrysler's cause list starts with low fluid, the sensor's 5-volt supply, a misinstalled primary filter and a loose cooler return filter, so clear those before you condemn the valve body.

A quick check from the same procedure: key on, engine off, push on the line pressure sensor connector and watch the PID. If line pressure jumps to about 30 psi when you push it, the problem is the connection, not the transmission.

When the switch valve is the problem, measure the valve before buying tooling. Sonnax shows the 45RFE family (45RFE, 545RFE, 68RFE) originally used a 0.420 in. large spool with 0.453 in. outer plugs, changing to a 0.453 in. spool around the 2010 model year. Sonnax recommends vacuum testing the bore rather than judging it by eye; without the test rig, a tested replacement valve body is the faster fix.

Problem 4: Burnt Overdrive Clutches (P0734, P0735)

Fourth and fifth both use the overdrive clutch, so towing in those gears is hard on it. Expect a flare on the 3-4 or a slip in fifth, often with a ratio code. Chrysler's cause list for P0734 (gear ratio error in 4th) reads like a map of the OD circuit: low fluid, cut OD or 4C accumulator seals, a missing OD bleed orifice in the main valve body, worn solenoid switch valve or plugs, a stuck main regulator valve, burned OD or 4C clutch, a broken reaction shaft support seal ring, and a loose or missing dribbler orifice in the reaction shaft support (P0734 Gear Ratio Error in 4th).

That list is why replacing only the clutches gets you a comeback. Caleb Perham of the Sonnax TASC Force breaks repeat OD failures into three areas in Transmission Digest (Transmission Digest):

• The switch valve bore plug. It strokes on the 2-3 and 3-4 to feed the OD clutch, so that end of the bore wears.
• The stator dribbler valve. A controlled leak that pre-charges the OD circuit. Restricted, the clutch applies late; leaking, it drags. Air should pass from the pump side toward the drum, not back.
• Clutch clearance. Too tight causes bind-up; too loose stretches fill time and lets the pack slip and overheat.

On the scan tool, use the clutch volume index (CVI) data. A CVI that keeps climbing after Quick Learn says that circuit is leaking. For towing trucks, see our 545RFE overheating prevention guide.

Problem 5: Limp Mode, P0882 and the Solenoid Pack

On the 2007 WK, the transmission control relay supplies power to the solenoids and pressure switches. The relay's output is fed back to the PCM on three pins as a sense circuit only. When the relay is off, nothing powers the solenoids and the transmission sits in limp-in. P0882 (TCM power input low) sets when the PCM sees less than 3.0 volts on that relay output while it is commanding the relay on (P0882 TCM Power Input Low).

Two details save money. First, Chrysler notes that a weak relay output can also set P0846, P0869, P0871, P0876 or P0988, and that those do not indicate an internal transmission or solenoid problem. Fix the power feed and the pressure switch codes go with it. Second, Chrysler's cause list is all circuit-side: fused B+, relay output and control circuits, relay ground, the relay, or the PCM.

The less obvious cause is the solenoid pack itself. Jarad Warren documents in ATRA's GEARS magazine that a shorted pack can drag the supply down and set P0882 on 545RFE trucks. His values: about 1.8 ohms for the shift solenoids and the LR/TCC solenoid, and about 3.7 ohms for the line pressure control solenoid, each measured from the common power pin; near zero is your short (GEARS, "An Uncommon Fix for Code P0882"). If the code sets key-on, engine-off, plug a known-good pack into the harness outside the case, clear and cycle the key. If the code stays gone, the pack was the problem.

Buy the right pack. Sonnax notes the white-connector, six-solenoid pack ran from 2000 through 2009 and the gray five-solenoid pack arrived in 2010 (Sonnax). So a 2005-2009 WK takes the white pack, and a 2010 needs to be checked before you order.

Problem 6: It Rolled in Park and It Is Not the Transmission

Before you tear into a WK that "went into neutral" or rolled, run the VIN. NHTSA recall 13V-175 covers 2005-2010 Grand Cherokees built February 11, 2004 through March 9, 2010 (and 2006-2010 Commanders): a transfer case electrical failure can shift the transfer case into neutral, and the vehicle can roll away. The remedy is a reflash of the final drive controller that runs the transfer case, Chrysler campaign N23 (NHTSA recall data). With the wheels up, if 545RFE output speed is rising and nothing turns, the transmission is not your problem.

After Any Repair: Quick Learn

Chrysler calls for Quick Learn after a transmission replacement, controller replacement, solenoid pack replacement, clutch or seal replacement, or valve body replacement or recondition. The scan tool will not run it unless the brakes are applied, engine speed is above 500 rpm, throttle angle is under 3 degrees, the lever stays in Park until prompted and then in Overdrive until it finishes, and calculated oil temperature is between 60 F and 200 F (Quick Learn, 4.7L/5.7L). Skip it and a good repair goes out the door with a harsh 1-2.

For other vehicles, see our transmission fluid spec chart.

FAQ

What are the most common 545RFE problems on a Jeep Grand Cherokee?

On 4.7L and 5.7L WK Grand Cherokees the usual list is fluid type and level mistakes, a misinstalled primary filter seal causing loss of prime, solenoid switch valve bore wear in the valve body, burnt overdrive clutches, and limp mode from P0882 or a shorted solenoid pack. Check recall 13V-175 too, since a transfer case that drops into neutral can look like a transmission failure.

Does every 2005-2010 Grand Cherokee have a 545RFE?

No. Chrysler's WK service information puts the 545RFE behind the 4.7L and 5.7L engines. The 3.7L V6 and the 3.0L diesel use the W5J400, also called the NAG1, which takes different fluid, filters and parts.

What transmission fluid does a 545RFE Grand Cherokee take and how much?

Mopar ATF+4 or a licensed ATF+4 equivalent, with no additives. Chrysler lists a service fill of 5.2 liters on 2WD and 6.2 liters on 4WD, and 13.33 liters dry after an overhaul. Check it in Park at about 180 F, in the HOT area.

Why is my Grand Cherokee stuck in second gear?

That is almost always limp-in. When the PCM turns off the transmission control relay, the 545RFE has no solenoid power and runs on its hydraulic default, so it pulls away in second. Pull the codes; P0882 points at the relay power feed, its wiring, the PCM or a shorted solenoid pack.

Related 545RFE guides

• Chrysler 45RFE and 545RFE Transmission Problems and Fixes
• 545RFE Durango Common Problems and Fixes
• 545RFE No Movement Diagnosis
• 545RFE Stuck in Gear Fix
• 545RFE Filter and Pan Service Guide
• 45RFE vs 545RFE Differences