The 2020 Grand Cherokee WK2 is a mature platform nearing end-of-life, generally reliable but showing age-related vulnerabilities in the ZF 8-speed transmission cooling system and, on Hemi V8 models, catastrophic cylinder deactivation failures that can grenade the engine.
ZF 8HP Transmission Oil Cooler Failure
Common · high severity
Typical onset: 60,000-90,000 mi
Symptoms: Transmission fluid mixing with coolant (strawberry milkshake in overflow tank), Harsh shifting or slipping between gears, Check engine light with transmission temp codes, Transmission failure if coolant contaminates fluid
Fix: Replace transmission oil cooler and flush both cooling system and transmission. If caught early, 4-6 hours labor. If contamination damaged transmission, add 12-18 hours for rebuild or replacement.
5.7L Hemi MDS Cylinder Deactivation System Failure
Occasional · high severity
Typical onset: 80,000-150,000 mi
Symptoms: Ticking or tapping noise from engine (lifter failure), Check engine light with misfire codes on cylinders 1, 4, 6, or 7, Loss of power and rough idle, Metal shavings in oil (lifter roller bearing disintegration)
Fix: Failed MDS lifters drop needle bearings into the engine, scoring camshaft lobes and damaging the block. Requires camshaft replacement, lifters, and often full engine rebuild or shortblock. 20-30 hours labor for shortblock, 15-18 for cam/lifter job if caught immediately.
Estimated cost: $4,500-8,500 (cam/lifters), $8,000-12,000 (shortblock or reman engine)
3.6L Pentastar Left Cylinder Head Failure
Occasional · high severity
Typical onset: 90,000-130,000 mi
Symptoms: Coolant loss with no external leaks, White smoke from exhaust on cold start, Check engine light with misfire codes on cylinders 1, 3, or 5, Overheating or rough running
Fix: Left (driver side) cylinder head develops cracks between valve seats or coolant passages. Requires head replacement, not just resurfacing. 12-15 hours labor including timing chain work and cleaning combustion chambers.
Estimated cost: $3,200-4,800
Rear Differential Pinion Seal Leak
Common · low severity
Typical onset: 50,000-100,000 mi
Symptoms: Gear oil dripping from rear differential near driveshaft, Low fluid causes whining noise during acceleration, Visible oil coating underside of differential housing
Fix: Pinion seal hardens and leaks. Replace seal and check pinion bearing preload. If caught early before fluid loss, 2-3 hours. If run low and bearings damaged, add carrier rebuild time.
Symptoms: Parking brake won't release or engage, Warning message 'Service Park Brake' on dash, Grinding or clicking from rear brakes with no movement, Brake calipers seized in applied or released position
Fix: Actuator motors in rear calipers fail, or EPB control module itself dies. Often requires both rear calipers plus module. 3-4 hours labor including programming.
Estimated cost: $800-1,400
Water Pump Failure (3.6L Pentastar)
Occasional · medium severity
Typical onset: 70,000-110,000 mi
Symptoms: Coolant leak from front of engine (water pump weep hole), Whining or grinding noise from accessory drive area, Overheating, Low coolant warning light
Fix: Water pump bearing or seal fails. Replace pump, thermostat, and flush coolant. 3-4 hours labor on the V6.
Estimated cost: $450-750
Owner tips
On 5.7L Hemi models, disable MDS with a tuner or use 89-octane fuel and avoid short trips to reduce lifter failures—or budget for the inevitable engine work
Change transmission fluid every 60,000 miles and inspect cooler lines annually; catching cooler contamination early saves $4,000+
Check rear diff fluid level every oil change—pinion seal leaks are slow but destructive if ignored
Avoid extended idle times on 3.6L V6; heat cycling accelerates head cracking on the left bank
Solid bones but aging powertrain tech makes this a gamble over 80k miles—budget $3k-5k for a Hemi lifter job or V6 head work, or skip the V8 entirely and keep a transmission fund.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
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Fitment notes: H8 group also compatible; AGM required for ESS (Engine Stop-Start) equipped models
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Every control module on the 2018-2021 Jeep Grand Cherokee — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
📍 Integrated into transmission valve body (8HP70/8HP75 ZF 8-speed) or mounted on left side of engine compartment (older 5-speed)
🔧 wiTECH 2.0
⚠️ ZF 8-speed transmissions have TCM inside valve body requiring transmission pan removal and fluid change. Requires adaptive learning drive cycle after programming.
Electric Power Steering Module (EPS)2.5 hr R&Rsecurity gateway +0.8 hr▸ programming details
📍 Integrated with steering column assembly or steering rack depending on system type
🔧 wiTECH 2.0
⚠️ Steering angle sensor calibration mandatory after replacement. Some models use column-assist, others rack-assist.
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
Chrysler (FCA US, LLC) is recalling certain 2014-2019 Ram 1500 and 2014-2020 Jeep Grand Cherokee vehicles equipped with 3.0L Diesel engines. The crankshaft position sensor tone wheel may delaminate, causing the engine to lose its ability to synchronize the fuel injector pulses and cam shaft timing, possibly resulting in an engine stall.
Consequence: An engine stall can increase the risk of a crash.
Remedy: Dealers will update the powertrain control module software to maintain vehicle propulsion, free of charge. Interim notification letters, notifying owners of the safety risk, were mailed August 3, 2023. Some owner notification letters were mailed October 31, 2023. The remaining owner notification letters will be mailed at a future date, anticipated July 2024. Owners may contact FCA US, LLC customer service at 1-800-853-1403. FCA US, LLC's number for this recall is 66A. This recall is an expansion of recall 20V-475.
Chrysler (FCA US, LLC) is recalling certain 2014-2020 Jeep Grand Cherokee, and 2014-2019 Ram 1500 vehicles equipped with 3.0L diesel engines. A high pressure fuel pump (HPFP) failure may introduce internal debris into the fuel system, potentially resulting in fuel starvation.
Consequence: Fuel starvation may result in an unexpected loss of drive power, increasing the risk of a crash.
Remedy: Dealers will replace the HPFP, and inspect and replace, if necessary, additional fuel system components, free of charge. Interim notification letters informing owners of the safety risk were mailed July 21, 2022. Owner notification letters for were mailed for Jeep Grand Cherokee owners starting January 11, 2024. Owner notification letters for Ram 1500 owners were mailed March 7, 2024. Owners may contact FCA US, LLC customer service at 1-800-853-1403. FCA US, LLS's number for this recall is Z46.
BACK OVER PREVENTION: SENSING SYSTEM: CAMERA · 20V191000
2020-09-10
Chrysler (FCA US LLC) is recalling certain 2020 Jeep Gladiator and Jeep Cherokee, 2019-2020 Ram 1500 Pickup, Ram 2500 Pickup, Ram 3500 Pickup, Chrysler Pacifica, Dodge Durango, Jeep Grand Cherokee, Jeep Wrangler, and Jeep Renegade and 2019 Dodge Challenger vehicles equipped with 8.4" or 12" radio displays. A software error can cause the rearview camera image to remain displayed after the vehicle has been shifted out of reverse. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 111, "Rearview Mirrors."
Consequence: The lingering rearview image can distract the driver, increasing the risk of a crash.
Remedy: Chrysler has notified owners, and dealers will update the radio display software, free of charge. Optionally, owners can choose to remotely update their software via an Over-The-Air (OTA) update available as of May 1, 2020. The recall began April 27, 2020. Owners may contact Chrysler customer service at 1-800-853-1403. Chrysler's number for this recall is W30-W37.
Performance
Horsepower
295hp
Torque
260lb-ft
0–60 mph
7.3sec
Quarter mile
15.6sec
Top speed
115mph
Fuel economy (EPA)
City
19mpg
Highway
26mpg
Combined
21mpg
Fuel
Regular Gasoline
Capability & size
Towing capacity
6,200lb
Payload
1,000lb
Curb weight
4,513lb
EPA class
Standard Sport Utility Vehicle 4WD
Wiper blades
WK2 generation (2011-2021). Some sources show 21" front blades as alternative.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2020 Jeep Grand Cherokee 3.6L V6 Pentastar and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.