2014 Jeep Grand Cherokee 845RE Transmission: Problems, Identification, and Used Replacement
Identify your exact 4x4 transfer case variant, understand common valve body failures, and learn what to look for when buying a used OEM replacement.
- This transmission requires mandatory programming; the internal TCM must be flashed with your vehicle's VIN and a Proxi Alignment must be performed to avoid limp mode.
- Only use Mopar 8 & 9 Speed ATF or a certified ZF Lifeguard 8 equivalent fluid; using incorrect fluid like ATF+4 will cause severe damage.
- Verify compatibility carefully; the 4x4 version for the 2-speed transfer case (Sales Code DFL) is not interchangeable with 2WD, single-speed 4x4, or other Chrysler/Dodge/Ram models.
- During installation, always replace the plastic pan/filter assembly, flush the transmission cooler lines, and ensure the torque converter is fully seated before installation.
Is This the Right Transmission for Your Grand Cherokee?
The 2014 Jeep Grand Cherokee uses a sophisticated 8-speed automatic transmission known as the Chrysler 845RE. This unit is also identified by the name of its original designer, ZF, as the 8HP45. It was built by Chrysler under license and is known for its smooth performance but also for some specific and costly failure points. This article focuses specifically on the version for 4x4 models with a 2-speed transfer case.
Vehicle Verification Checklist
Before buying a replacement, you must confirm your vehicle is equipped with this exact variant. Check the following on your Grand Cherokee:
| Check Point | Specification |
|---|---|
| VIN Number | The 8th digit of your Vehicle Identification Number (VIN) should be 'G' (for the 3.6L V6) or '8' (for the 3.0L gasoline V6). |
| Center Console | Your Selec-Terrain dial must have a physical button labeled "4WD LOW". This indicates you have the required 2-speed transfer case (Quadra-Trac II or Quadra-Drive II). |
| Door Jamb Sticker | Look for the transmission Sales Code "DFL" on the sticker located on the driver's side door jamb. |
Physical Part Identification
If the transmission is out of the vehicle, you can confirm its identity by locating the stamped numbers on the driver's side of the transmission case, near the rear bottom corner. It should be stamped with "845RE" or "8HP45".
Warning: Not all 845RE transmissions are the same. This unit will NOT fit Grand Cherokees that are 2WD (two-wheel drive) or have the single-speed Quadra-Trac I 4x4 system. It also will not interchange with transmissions from other Chrysler, Dodge, or Ram vehicles, even if they look similar. Differences in the tailhousing, output shaft, and internal software make them incompatible.
Common Failure Symptoms
A failing 845RE transmission can show several signs. While some issues can be fixed with a software update, others point to a definite internal failure requiring replacement. Look out for:
- Harsh or erratic shifting between gears
- Delayed engagement when shifting into Drive or Reverse
- Slipping or a feeling of "neutraling out" at high engine speeds
- Vehicle entering "limp mode," where it gets stuck in one gear
- Illuminated Check Engine Light with transmission-related fault codes (like P0731, P0734, P0735)
- Complete loss of movement
Diagnostic Flowchart
Known Problems, Recalls, and Service Bulletins
Several documented issues exist for this transmission. Before replacing the unit, check if a recall or Technical Service Bulletin (TSB) applies to your vehicle, as a software update may solve the problem.
| Identifier | Affected Years | Problem | Remedy |
|---|---|---|---|
| Recall S27 / NHTSA 16V-240 | 2014–2015 | The electronic "monostable" gear selector could make it difficult for drivers to tell if the vehicle was truly in Park. This could lead to the vehicle rolling away unexpectedly. | A free software update from a dealer adds an "Auto Park" feature, which automatically shifts the transmission into Park if the driver's door is opened while the engine is running and the vehicle is not in Park. |
| TSB 21-012-14 REV. B | 2014 | Owners may experience poor shift quality, including harshness or bumps during shifts, or premature clutch wear. | A mandatory "Transmission Shift Enhancements - Adaptation Drive Learn Procedure" must be performed with a professional scan tool. This procedure allows the transmission's computer to relearn clutch engagement points. It is required any time a transmission or its internal computer is replaced. |
| TSB 21-023-16 | 2014-2016 | This TSB addresses various issues including harsh shifts, delayed gear engagement, and incorrect gear ratio fault codes like P0734. | The Transmission Control Module (TCM) must be "flashed" (reprogrammed) with the latest available software by a dealer or qualified shop. |
Pro Tip: A burnt smell from the transmission fluid does not automatically mean the transmission has failed. Chrysler noted in Case Number S2621000003 REV. A that the specific fluid used (Mopar 8 & 9 Speed ATF) can develop a burnt odor during normal operation due to its additives. Do not replace the unit based on smell alone.
What Fails at Every Mileage Band
Pro Tip: The mileage bands below describe the condition and expected wear of USED replacement units of that mileage. The checklists provided are things to do WHILE INSTALLING the purchased transmission, not maintenance for your current failing unit.
Under 60,000 Miles
Transmissions in this range are generally healthy, but early failures do occur. Known issues include valve body problems causing harsh 1-2 shifts or delayed engagement, early torque converter failure (sometimes around 10,000 miles), software glitches causing shift delays around 2500 RPM, and transmission pump failures.
- ✓Do during install (required): Flash the latest available TCM software to address known shift quality issues and recalls. Replace the plastic pan/filter assembly, pan bolts, and fill with new ZF Lifeguard 8 / Mopar 8&9 Speed ATF.
- ✓Do during install (recommended): Flush the transmission cooler and lines to remove any potential debris from the donor vehicle.
- ✓Cheap insurance while the engine is out: Check the transmission cooler line O-rings for heat-related deformation or leaks, as this is a known leak point.
60,000 - 100,000 Miles
At this stage, shift quality degradation is common due to fluid breakdown. ZF (the transmission designer) recommends a fluid and filter service in this interval. Symptoms include harsh downshifts when stopping, delayed gear engagement from Park to Drive, and torque converter shudder at highway speeds (80-100km/h).
- ✓Do during install (required): Perform a complete fluid and filter (pan) service with the correct ZF Lifeguard 8 / Mopar 8&9 Speed ATF. The original fluid is well past its service life. Flush the transmission cooler and lines thoroughly.
- ✓Do during install (recommended): Replace the torque converter front pump seal and the cooler line O-rings while access is easy.
- ✓Cheap insurance while the engine is out: Carefully inspect the valve body for any signs of contamination or wear. Consider a valve body zip kit if any issues are suspected.
100,000 - 150,000 Miles
This is where major failures spike, especially if the fluid was never changed. Common issues include a sudden failure to shift out of 1st gear (often throwing codes P0731, P0735), slipping or "neutraling out" at high RPM during passing maneuvers, torque converter failure causing humming/grinding noises, and complete valve body failure (parts are sometimes on indefinite backorder).
- ✓Do during install (required): All items from the 60-100k mileage band (Fluid/Pan service, cooler flush, seals).
- ✓Do during install (recommended): Install a valve body rebuild kit (e.g., Sonnax Zip Kit) as a preventative measure. Worn valve body bores and seals are a primary cause of pressure loss and shift issues at this mileage.
- ✓Cheap insurance while the engine is out: If the budget allows, replacing the torque converter is wise at this stage, as they are a known failure point and require transmission removal to access.
Over 150,000 Miles
With proper maintenance, the service life is generally expected to be between 150,000 to 200,000 miles. However, units in this band are at high risk for complete transmission failure, internal component failure (clutch packs and seals), and catastrophic damage leading to a no-move condition.
- ✓Do during install (required): Always install a new torque converter, new plastic pan/filter, and all external seals. Do not reuse any components from the failed unit except for the core case itself.
- ✓Do during install (recommended): At this mileage, a simple install is risky. The unit should ideally be professionally inspected and rebuilt with new seals, gaskets, clutch packs, and a rebuilt valve body.
- ✓Cheap insurance while the engine is out: Assume a used transmission in this mileage band should be considered a core for rebuilding or installed with the expectation of a limited lifespan.
Real Owner Experiences
The following table highlights real-world failures, symptoms, and costs reported by 2014 Grand Cherokee and related 845RE owners.
| Source | Mileage | What Happened | Cost |
|---|---|---|---|
| CarComplaints.com | 35,000 | Transmission problems led to a diagnosis of a bad transmission pump. The unit was replaced under the 5-year/100,000-mile powertrain warranty. | $0 (Warranty) |
| tunedbyai.io | 10,200 (average) | Reports of torque converter failure symptoms, including shuddering during acceleration and slipping sensations during gear changes. | Not specified, likely warranty. |
| BobIsTheOilGuy Forums | Not specified, but common in 2014 models | A known issue of shift flare (engine revs up between 1-2 shift), especially when cold. Dealer fixed it by replacing the valve body after multiple software flashes failed. | Not specified, likely warranty. |
| CarComplaints.com | 65,000 | Vehicle shifted itself into reverse, causing an accident. This aligns with the symptoms of the monostable shifter recall. | $5,000+ (collision damage) |
| FCP Euro / BimmerLife | 60,000 | Owner serviced the 'lifetime' fluid based on ZF's recommendation (50-75k miles). Noticed faint groans at startup and longer cold shifts, which prompted the service. | DIY or Independent Shop Service Cost |
| Reddit r/MechanicAdvice | 130,000 | Vehicle suddenly would not shift out of 1st gear without revving very high, then would slam into 2nd. Threw codes P0731 and P0735. Owner suspected internal pressure loss from worn valve body seals or a bad solenoid. | Owner attempted DIY repair; a remanufactured unit was quoted at $5,000-$5,500. |
| Reddit r/GrandCherokee | 130,000 | Transmission began slipping and would not accelerate when trying to pass on the highway (RPMs flare to 4500-5000). The fluid had never been changed. | Diagnostic needed; potential for torque converter or internal damage. |
| Reddit r/JeepGrandCherokee | 152,000 | Transmission valve body failed. The part was on indefinite backorder from Chrysler, rendering the vehicle inoperable. | $3,800 (covered by warranty, but part was unavailable) |
| CarComplaints.com | 150,000 | Transmission went out approximately a month and a half after a recall-related service. Dealer quoted $9,000 for replacement; an independent shop quoted $2,800 for a rebuilt unit. | $2,800 - $9,000 |
| RamForum.com | 250,000 | Transmission in a 2014 Ram 1500 (same 845RE family) failed completely. | Owner sought a used replacement. |
| Unknown | Got a second quote from another shop for a rebuild. Original quote was $7,200 + tax. | $5,500 | |
| 130,000 | Attempted to repair the valve body and replace the TCM himself to avoid the high cost of replacement. Original quote was $5,000 - $5,500 for a remanufactured unit. | Ongoing DIY repair | |
| 80,000 | Advised by others to seek a second opinion from an independent shop after dealer quoted $12,900 for a new transmission and transfer case. | Not specified | |
| ~114,000 | Contesting the cost with Jeep corporate, believing a recall-related software update caused the failure. Dealer quoted $12,000 for a new transmission. | Not specified, exploring options as the quote exceeded the vehicle's value. |
Repair or Replace?
Deciding whether to repair your existing 845RE or replace it entirely depends on the specific failure mode and the condition of the internal components.
When Repair Makes Sense
- Valve Body / Solenoid Failure ($500 - $1,500): This is a viable repair if the transmission fluid is clean (no significant metal debris) and the issues are limited to harsh/delayed shifting or specific solenoid error codes. A remanufactured valve body can often resolve what seems like a major failure.
- Leaking Seals or Pan Gasket ($200 - $500): If the transmission is functioning correctly but leaking fluid, replacing the pan (which includes the integrated filter), pan gasket, and any external seals is a cost-effective repair.
When Replacement is Smarter
Replacement with a used or remanufactured unit is necessary when there is evidence of catastrophic internal failure, such as finding significant metal shavings in the transmission pan. This indicates damage to hard parts like clutches or planetary gear sets, making a simple valve body swap insufficient. It is also the preferred path when multiple internal components are failing and the cost of a comprehensive rebuild approaches or exceeds the price of a warrantied remanufactured assembly.
Replacement Cost Comparison
The cost to replace a 2014 Grand Cherokee transmission varies significantly based on the type of replacement unit. Labor costs are also a major factor.
| Part / Service | Estimated Cost (USD) |
|---|---|
| New OEM / Dealer Replacement | $7,000 - $12,000+ (Often refers to remanufactured units) |
| Remanufactured | $5,100 - $7,200+ |
| Used OEM | $1,000 - $2,500 |
| Installation Labor | $900 - $1,800 |
Questions to Ask Your Installer
If you are hiring a shop to install a replacement transmission, ensure they are qualified by asking:
- Do you have a dealer-level scan tool (like wiTECH) to perform the required VIN programming, Proxi Alignment, and adaptive relearn procedure?
- Does your quote include a mandatory flush of the transmission cooler and lines?
- Are you using Mopar 8 & 9 Speed ATF or a certified ZF Lifeguard 8 equivalent fluid?
- Does the quote include a new transmission pan/filter assembly and new torque converter seal?
- How will you verify the torque converter is properly seated before mating the transmission to the engine?
- What is the warranty on the replacement unit and the labor?
Installation and Programming: What to Know
Replacing this transmission is a complex job not recommended for DIY mechanics without significant experience and specialized tools.
DIY vs. Professional Installation
This is an expert-level job requiring a heavy-duty transmission jack, a professional-grade diagnostic scan tool, and specific sockets (like Torx T40 and 8mm hex). The shop labor estimate is between 6 and 10 hours. Given the programming requirements, professional installation is strongly advised.
Mandatory Programming
Warning: You cannot simply swap this transmission and drive away. The Transmission Control Module (TCM), which is located inside the transmission on the valve body, is locked to the donor vehicle's VIN. A dealer-level scan tool (like wiTECH, Snap-on, or Autel) is required to flash the replacement unit with your vehicle's VIN, perform a procedure called Proxi Alignment to sync it with other vehicle modules, and run the Quick Learn/Adaptive Relearn procedure. Failure to do this will result in the vehicle entering limp mode or not starting at all due to immobilizer codes.
Required Parts and Fluids
To ensure a successful installation, the following parts must be replaced:
Warning: Only use Mopar 8 & 9 Speed ATF or an approved ZF Lifeguard 8 equivalent. Using generic ATF, ATF+4, or Dexron VI will cause severe damage.
- Transmission Fluid: Use the correct fluid as specified above.
- Transmission Pan: The original pan is plastic and has a built-in filter that cannot be serviced separately. Always install a new pan assembly with its integrated filter, gasket, and new single-use bolts.
- Seals and Solvents: Always replace the torque converter front pump seal and perform a complete flush of the external transmission cooler and lines with a professional-grade solvent. This removes metal debris from the previous failure.
Common Installation Mistakes
Avoid these critical errors that can destroy a replacement transmission:
- Improper Torque Converter Seating: The torque converter must be fully seated into the transmission's front pump. You should feel three distinct "clicks" or drops as it engages. If it's not fully seated, tightening the bellhousing bolts will crack the front pump, ruining the transmission.
- Cracking the Plastic Pan: The new pan's bolts must be tightened to exactly 10 Nm (89 in-lbs) in a criss-cross pattern to prevent leaks or cracks.
- Incorrect Fluid Level Check: This transmission has no dipstick. The fluid level must be checked via a fill plug on the side of the case while the engine is running, the vehicle is level, and the transmission fluid temperature is strictly between 86°F (30°C) and 122°F (50°C). Furthermore, the transmission must reach full operating temperature (above 180°F / 82°C) during flushing and level checking to open the thermal bypass valve.
Freight and Delivery Reality
If you are ordering a used 845RE transmission online, it will not arrive via standard parcel delivery. This assembly weighs approximately 170 lbs and measures roughly 24" x 18" x 18" before crating. It will ship as LTL (Less Than Truckload) freight on a wooden pallet.
Because of its size and weight, delivery requires a truck equipped with a liftgate if you are shipping to a residential address or a shop without a loading dock. Always perform a pre-purchase verification interview with the seller to confirm the exact donor vehicle specs (ensure it had the 2-speed transfer case). When the freight carrier arrives, you must inspect the transmission for physical damage (such as a cracked case or broken sensors) before signing the delivery receipt. Signing without noting damage releases the carrier from liability.
Frequently Asked Questions (FAQ)
Can I use a transmission from a Dodge Durango or Ram 1500?
No. While other Chrysler products use the 845RE/8HP family, the Grand Cherokee version has a unique tailhousing and output shaft to mate with its specific 2-speed transfer case. The software is also different and not interchangeable.
Does this transmission have a dipstick?
No. The fluid level check is a complex procedure that must be done from a fill plug on the side of the transmission while the vehicle is running and the fluid is within a specific temperature range (86°F to 122°F). This is best left to a professional mechanic.
Do I have to replace the transmission pan?
Yes. The factory pan is a plastic assembly with the transmission filter permanently integrated into it. Reusing the old pan means reusing a clogged and contaminated filter, which will quickly destroy the replacement transmission. Always install a new pan/filter assembly.
What happens if I don't program the new transmission?
The vehicle will either not start or will immediately go into "limp mode," locking itself into a single gear. The internal Transmission Control Module (TCM) is electronically tied to the original vehicle's VIN and must be reprogrammed to match your Grand Cherokee's VIN through a process called Proxi Alignment.
What parts are included with a used 845RE transmission?
A standard used assembly from a reputable recycler includes the transmission case, all internally lubricated parts, the extension/tail housing, the transmission oil pan with integrated filter, the torque converter, and the valve body/mechatronics unit. It typically excludes external sensors, wiring harnesses, the shifter/linkage, the flexplate, and external cooler lines.
Can I use generic ATF or ATF+4 fluid?
Absolutely not. The 845RE requires highly specific fluid formulations. You must use Mopar 8 & 9 Speed ATF or a certified ZF Lifeguard 8 equivalent. Using generic ATF, ATF+4, or Dexron VI will cause severe internal damage and void any warranty.
Helpful Videos
Technical Specifications
Model Name: Chrysler 845RE / ZF 8HP45; Application: 2014 Jeep Grand Cherokee 4x4 with 2-speed transfer case (Quadra-Trac II / Quadra-Drive II); Engine Compatibility: 3.6L V6 (VIN 8th digit 'G'), 3.0L V6 (VIN 8th digit '8'); Sales Code: DFL; Required Fluid: Mopar 8 & 9 Speed ATF / ZF Lifeguard 8; Weight: Approx. 170 lbs; Pan Bolt Torque: 10 Nm (89 in-lbs); Fluid Check Temperature: 86°F - 122°F (30°C - 50°C)
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Jeep Grand Cherokee:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is This the Right Transmission for Your Grand Cherokee?
- Vehicle Verification Checklist
- Physical Part Identification
- Common Failure Symptoms
- Diagnostic Flowchart
- Known Problems, Recalls, and Service Bulletins
- What Fails at Every Mileage Band
- Under 60,000 Miles
- 60,000 - 100,000 Miles
- 100,000 - 150,000 Miles
- Over 150,000 Miles
- Real Owner Experiences
- Repair or Replace?
- When Repair Makes Sense
- When Replacement is Smarter
- Replacement Cost Comparison
- Questions to Ask Your Installer
- Installation and Programming: What to Know
- DIY vs. Professional Installation
- Mandatory Programming
- Required Parts and Fluids
- Common Installation Mistakes
- Freight and Delivery Reality
- Frequently Asked Questions (FAQ)
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