2018 Jeep Grand Cherokee powertrain problems
severe 66 complaints filed with NHTSA · avg repair $2,500 · see powertrain across all vehicles →
Owners have filed 66 powertrain complaints with NHTSA against this vehicle, but no formal recall covers the issue — the federal record reflects what manufacturers have admitted, not everything owners are reporting.
The failure pattern owners describe
Buyer takeaway: The 2018 Grand Cherokee powertrain has significant documented issues across engine reliability, transmission function, and electrical controls—from water pump leaks and valvetrain collapse to transmission engagement failures and sudden loss of power while driving. These are not isolated incidents; owners report similar problems in online forums, dealer service bulletins, and ongoing litigation.
The 2018 Jeep Grand Cherokee's powertrain is plagued by multiple failure modes that appear systemic rather than one-off defects.
Engine problems start with a water pump freeze plug that leaks when hot, a design flaw in the 3.6L V6 that owners say serves no purpose. More serious are valvetrain failures—collapsed lifters, damaged rocker arms, and cracked camshafts—that dealers acknowledge as typical for the engine. These develop gradually over tens of thousands of miles and can lead to complete power loss, engine seizure, and bills exceeding $8,500 for replacement.
Transmission failures run the gamut: harsh shifts with violent RPM spikes, delayed engagement requiring multiple restart cycles, complete loss of drive despite engine running, and unexpected downshifts into limp mode at highway speed. The shift-gate sometimes flashes with no diagnostic codes set. Owners report transmission issues both during normal operation and immediately after dealer service, and some note the vehicle enters 15–20 mph limp mode without warning. Dealers cite unavailable parts and cannot reproduce intermittent faults.
Electrical shutdowns are terrifying. Complete power loss while driving at highway speed has forced multiple owners to coast to shoulders while losing steering and brake assist. The powertrain control module (PCM) voltage regulator fails repeatedly; recall 18V524000 exists but does not cover all VINs, and dealers refuse service outside the recall scope.
Parking safety is compromised when vehicles roll away from Park into Reverse on level surfaces, sometimes with engine running, forcing owners to jump in and brake. Vehicle fires, unintended acceleration, and transmission solenoid glitches that leave cars immobilized in traffic complete a troubling picture.
Same Jeep Grand Cherokee powertrain reports on nearby years: 2015 · 2016 · 2017 · 2019 · 2020
Failure modes owners describe
Water pump coolant leaks (freeze plug failure)
Persistent coolant leaks from a freeze plug on the water pump that fails when engine reaches operating temperature. Owners report this as a design flaw specific to the 3.6L V6 engine, not normal wear and tear. The leak stems from a freeze plug that serves no functional purpose.
When: At operating temperature; affects vehicles regardless of mileage or maintenance history
Symptoms owners cite: Coolant leaks when engine is hot; Potential engine overheating; Loss of coolant without visible drips elsewhere; Risk of severe engine damage
Repairs/costs cited: Requires water pump replacement or freeze plug repair
Engine valvetrain failure (collapsed lifters/rocker arms)
Catastrophic internal valvetrain failure involving collapsed lifters or rocker arms and severely damaged camshafts. Dealers have confirmed this is a typical failure mode for this engine design. Develops gradually over tens of thousands of miles with progressive internal damage affecting both cylinder banks, not isolated components.
When: Develops gradually over tens of thousands of miles; vehicles with 36,000–96,000 miles reported failures
Symptoms owners cite: Abnormal ticking or knocking noises; Progressive loss of power; Misfire symptoms; Eventual sudden loss of engine power at speed; Engine seizure; Stalling without warning
Repairs/costs cited: Requires engine replacement; repair costs cited $8,500–$13,000
Recalls/TSBs owners mention: Dealers acknowledge this is typical for the engine design; issue documented in TSBs and ongoing litigation; not yet subject to recall
Powertrain control module (PCM) failure / electrical shutdown
Complete loss of electrical power while driving, causing engine shutdown, loss of steering assist, and braking impairment. Vehicle becomes uncontrollable. Repeated incidents occur due to blown master fuses or PCM voltage regulator chip failure. Recall 18V524000 exists but does not cover all affected VINs.
When: Intermittent; occurs at 45–70 mph highway speeds and low-speed city driving; vehicles with <40,000 miles reported failures
Symptoms owners cite: Sudden loss of all electrical power while driving; Engine shuts off without warning; Loss of power steering and braking assist; Unable to control vehicle or exit traffic; Blown master fuse; Multiple random warning messages on display; Rear wiper operating unintentionally
Codes mentioned: Related to NHTSA Recall 18V524000 (voltage regulator chip failure in PCM)
Repairs/costs cited: Dealers replace master fuse or reprogrammed powertrain control module; does not resolve underlying issue permanently in many cases
Recalls/TSBs owners mention: NHTSA Recall 18V524000 exists for PCM voltage regulator chip failure, but does not include all affected VINs; manufacturer refuses to service vehicles outside recall scope; owners must file lemon-law claims
DEF system fault (diesel models)
Check engine light and DEF system error messages appear on brand-new vehicles. Dealer misdiagnoses initial code P20E8 (DEF pump low pressure fault) as a software issue rather than addressing underlying system pressure or component failure.
When: Occurred two weeks after purchase on new vehicle; repeat failures after dealer service
Symptoms owners cite: Check engine light illuminates; P20E8 code (DEF pump low pressure fault); DEF system problems message on dash; Dealer confusion about root cause
Codes mentioned: P20E8 (DEF pump low pressure fault)
Repairs/costs cited: Initial dealer service added DEF fluid and cleared codes, but light returned; second dealer confirmed tank was underfilled at delivery and verified pressure at injector
Transmission shift/engagement failures and harsh shifting
Multiple types of transmission failure: delayed engagement, hesitation during shifts, harsh/violent upshifts and downshifts, lurching forward unexpectedly, and loss of power transmission despite engine running. Issues range from single harsh shifts to chronic intermittent problems. Occurs both after transmission service and during normal operation. Some owners report transmission enters limp mode (capped at 15–20 mph) without warning.
When: At various mileages from <1,000 to 96,000 miles; can occur at traffic lights, during highway acceleration, or at low speeds
Symptoms owners cite: Delayed transmission engagement; Hesitation during shifts; Harsh or violent gear shifts with engine RPM spike; Lurching or jerking forward; Loss of power despite engine running; Vehicle will not move despite gear selection; Transmission enters limp mode unexpectedly; Gear grinding (reverse); Inability to select gears after restart attempts; Tachometer spike when shifting; Message 'Shift to P then Desired Gear' displayed
Codes mentioned: Check engine light often illuminated
Repairs/costs cited: Owners cite transmission service, transmission fluid exchange, and component failures; repairs not completed in many cases due to unavailable parts or undiagnosed root cause; ZF transmission alleged to require fluid change every 50,000–75,000 miles despite Jeep claiming 'filled for life'
Recalls/TSBs owners mention: Recall 25V011000 (Power Train) and 18V280000 (Power Train) exist but do not cover all affected VINs; manufacturer does not acknowledge as systemic issue
Transmission or driveline unable to hold vehicle in Park
Vehicle rolls away or shifts out of Park into Reverse while parked, even on level surfaces or slight slopes. Vehicle moves without brake input or foot on accelerator. Occurs on multiple occasions, sometimes with engine running, sometimes after restart. Poses risk of collision with other vehicles, property, or injury to occupants.
When: Intermittent; occurs on level or slightly sloped parking lots; vehicles with 10,000–36,000 miles reported failures
Symptoms owners cite: Vehicle rolls backward while in Park; Vehicle unexpectedly shifts into Reverse from Park; Vehicle moves at idle speed without accelerator input; No visible mechanical cause; Can happen multiple times
Repairs/costs cited: Dealer unable to diagnose or reproduce issue; vehicle not repaired
Recalls/TSBs owners mention: Recall 18V280000 (Power Train) exists for similar failures but does not cover all VINs
Transmission electric/solenoid issues (intermittent no-drive condition)
Intermittent condition where vehicle will not move when shifted into Drive or Reverse; gear shift console and dash flash; vehicle becomes unresponsive. Requires power cycle (off/restart) to resolve temporarily. No diagnostic trouble codes are set. Issue repeats chronically over months despite multiple dealer visits.
When: Intermittent; ongoing for over a year; occurs unpredictably
Symptoms owners cite: Vehicle will not move in Drive or Reverse; Gear shift console and dash flash; No diagnostic codes set; Vehicle requires restart to regain function; Issue recurs after each restart
Repairs/costs cited: Vehicle in shop 3+ times; technicians unable to diagnose; no resolution found; owners report video documentation available to dealers
Engine/transmission stall and no-start conditions
Engine stalls during operation (at traffic lights, while accelerating, during low-speed maneuvers) or refuses to restart. Vehicle becomes stranded. Multiple restart attempts sometimes required before vehicle engages. Check engine light illuminates. Related to PCM/transmission software or electrical control issues.
When: At various speeds and conditions; vehicles with <10,000 to 70,000 miles reported
Symptoms owners cite: Engine stalls unexpectedly; Vehicle refuses to restart immediately; Multiple restart attempts required; Check engine light illuminated; Delayed response when restarting; Engine shuddering while idling; Hesitation when depressing accelerator
Codes mentioned: Check engine light (code not specified in most cases)
Repairs/costs cited: PCM reprogramming attempted; issue recurs in some cases; repairs not completed due to lack of diagnosis
Auto stop/start feature malfunction
Engine Stop/Start system fails to properly control engine shutdown and restart. Engine continues running after push-button stop is pressed, or vehicle lurches forward unexpectedly during stop/restart cycle. Associated with delayed acceleration and transmission issues.
When: During normal operation; vehicles with <1,000 miles reported
Symptoms owners cite: Engine continues running after pressing stop button; Vehicle lurches forward at traffic lights when reaching 0 mph; Delayed response during restart after stop; Unpredictable acceleration behavior
Repairs/costs cited: Owner disabled auto stop feature as temporary workaround
Unintended acceleration / throttle control failure
Vehicle accelerates on its own without foot on accelerator pedal, or continues to accelerate after driver releases throttle. Occurs at parking lots, during parking attempts, and on open road. Electronic throttle control error messages displayed.
When: At low speeds (parking, stop-and-go) and after wide-open-throttle (WOT) acceleration
Symptoms owners cite: Vehicle accelerates without driver input; Continues to accelerate after releasing throttle; Electronic throttle control error message; Uncontrolled rapid acceleration; Vehicle propelled forward at unsafe speeds
Codes mentioned: Electronic throttle control error
Repairs/costs cited: Driver had to press ignition button and slam brakes to stop vehicle
Recalls/TSBs owners mention: Floor mat recall (unspecified) previously performed; does not resolve issue
Engine fire
Engine caught fire while vehicle was parked in a garage. No visible leaks, warning lights, or open recalls noted prior to fire. Fire started near engine air cleaner area per dealership inspection, but cause remains undetermined after 3+ weeks of investigation.
When: While parked; vehicle had 55,575 miles
Symptoms owners cite: Engine smoking; Engine caught fire; No prior warning signs
Repairs/costs cited: Dealership confirmed fire not caused by leaks or electrical issues; suspected origin near air cleaner
Recalls/TSBs owners mention: Open investigation by Jeep Corporate for 3+ weeks with no communication or updates
Coolant in combustion chamber (head gasket/cylinder failure)
Coolant enters combustion chamber, indicating head gasket failure or internal engine breach. Symptoms include low coolant level without visible leaks, smoke from exhaust, and misfire codes.
When: After ~10 minutes of driving; vehicle with 83,000 miles
Symptoms owners cite: Hot temperature lamp illuminates; Coolant level drops without visible leaks; Smoke from exhaust pipes; Engine misfire
Codes mentioned: Cylinder misfire code (exact code not specified)
Repairs/costs cited: Independent repair shop confirmed coolant in combustion chamber; engine replacement needed
Transfer case failure
Transfer case fails, preventing proper 4WD engagement. Wheels can lock up unexpectedly. Similar to existing recall for other VINs but affected vehicle VIN not included.
When: During normal driving; vehicle with low mileage
Symptoms owners cite: SERV 4WD light illuminates; Traction control unavailable; Gears catching at acceleration start; Wheels lock up risk; Unsafe to drive per dealer assessment
Repairs/costs cited: Dealer diagnosed transfer case failure
Recalls/TSBs owners mention: Similar recall exists for other VINs (unspecified); affected vehicle VIN not included
ABS and brake control module failures
ABS control module and hydraulic control unit (HCU) fail, causing rear tires to lock up without brake input. ABS, brake light, and traction control warning lights illuminate. Pulsation felt from rear.
When: At various speeds; vehicle with 80,000 miles
Symptoms owners cite: ABS warning light illuminates; Brake light warning illuminates; Traction control warning illuminates; Rear tires lock up without brake input; Pulsation from rear of vehicle
Repairs/costs cited: Dealer diagnosed ABS control module and HCU replacement needed
Recalls/TSBs owners mention: Possibly associated with unknown recall
Infotainment system freezing and malfunction
Radio and navigation control systems freeze and become unresponsive. Volume controls operate on their own. System requires restart to function, but problem recurs within 1 minute. Dealership stereo replacement did not fully resolve issue.
When: Intermittent; vehicles with <16,000 miles reported
Symptoms owners cite: Radio/navigation system freezes; Volume increases or decreases on its own; System unresponsive to controls; Requires restart to function temporarily; Issue recurs within 1 minute
Repairs/costs cited: Dealership replaced stereo system; issue partially resolved but volume problem persists
EGR cooler crack and incomplete recall remedy
EGR cooler cracks from thermal fatigue (as per recall W79), but recall remedy only replaces EGR valve, not the cooler as specified. Cooler is where coolant flows and poses fire risk; valve does not carry coolant. Incomplete repair leaves fire hazard unresolved.
When: Related to recall service performed 4/7/2021; issue persisted after service
Symptoms owners cite: Mil light on with same code after valve-only replacement; Fire hazard unresolved
Repairs/costs cited: Recall W79 specifies EGR cooler replacement with thicker walls; only EGR valve replaced; vehicle still in shop
Recalls/TSBs owners mention: FCA states current remedy is valve replacement, not cooler replacement, contrary to recall specification
Reverse gear grinding and electrical burning smell
Gear grinding noise when shifting into Reverse on multiple occasions. Separate incident of electrical burning smell from unknown location. Dealership unable to reproduce grinding; no diagnosis provided. Owner fears safety risk.
When: Over more than one year of ownership; multiple occasions
Symptoms owners cite: Gear grinding in Reverse; Electrical burning smell; Issue intermittent; dealer unable to reproduce
Repairs/costs cited: Dealership unable to diagnose or fix; vehicle returned without repairs
Paddle shifter control reversed (TrackHawk)
Upshift paddle performs downshift function when vehicle is in motion, causing unintended downshift, engine revving, engine braking, and aggressive weight shift to front. Issue affects 2010+ FCA vehicles with paddle shifters.
When: During normal driving in TrackHawk model
Symptoms owners cite: Upshift paddle causes downshift instead; Engine revs unintentionally; Unintended engine braking; Aggressive weight shift to front
Transmission sudden downshift and limp mode
Transmission suddenly shifts into low gear at highway speed (60 mph) without warning, enters limp mode, and caps vehicle at 15–20 mph. No warning lights before, during, or after event. After restart, vehicle operates normally. Dealer unable to find issue.
When: At 60 mph highway speed; vehicles with low mileage
Symptoms owners cite: Sudden downshift to low gear at highway speed; Vehicle enters limp mode; Speed capped at 15–20 mph; No prior warning lights; Normal operation after restart
Repairs/costs cited: Dealer unable to diagnose
Delayed or failed transmission gear engagement
Vehicle fails to accelerate despite foot on accelerator when shifting from stop. Transmission does not engage smoothly or at all. Requires cycling gear selector or restarting to engage properly.
When: At stop lights, during low-speed driving, at stop signs; vehicles with various mileages
Symptoms owners cite: Vehicle fails to accelerate despite foot on pedal; Transmission delayed to engage; Requires multiple gear selector cycles; Message 'Shift to P then Desired Gear' displayed; Check engine light illuminated
Codes mentioned: Check engine light
Repairs/costs cited: Issue resolved by cycling gear selector or restart, but recurs
Recalls/TSBs owners mention: Recall 25V011000 (Power Train) exists but does not cover all affected VINs
Transfer case stuck in 4-Low (electrical/solenoid)
Vehicle enters 4-Low mode on first day of ownership and becomes stuck. Cannot shift to AWD mode or neutral. Related to Service 4WD light and stability control unavailability.
When: First day of ownership; intermittent issue recurring
Symptoms owners cite: SERVICE 4WD light appears; Vehicle stuck in 4 Low; Cannot shift to AWD mode; Cannot shift to neutral; Service Stability Control message appears; Forward collision system unavailable
Wheel lock-up during braking (ABS failure)
Rear wheels lock up without driver pressing brake pedal. ABS system fails to prevent lock-up. Related to ABS and HCU module failure.
When: At various speeds; vehicle with 80,000 miles
Symptoms owners cite: Rear wheels lock up unexpectedly; No brake pedal input; Pulsation from rear
Repairs/costs cited: ABS and HCU module replacement needed
Synthesized from 66 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 0 most recent
Common questions
How serious is the powertrain problem on the 2018 Jeep Grand Cherokee?
It's a meaningful issue. 66 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $2,500.
At what mileage does the powertrain typically fail?
Across the 41 complaints that reported odometer mileage, most powertrain failures cluster between 4,000 and 36,000 miles, with the median around 20,005. A quarter of owners report trouble before 4,000; a quarter make it past 36,000. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
What does it cost to fix?
Independent shops typically charge around $2,500 for powertrain repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to powertrain?
No active recalls currently cover powertrain issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.