2008 Jeep Grand Cherokee powertrain problems

Following recall N23 (NHTSA 13V-175) software reprogramming of the Final Drive Controller Module (FDCM), owners report inability to shift transfer case into 4WD Low, Neutral, or 4WD High—conditions that worked before the recall. Many report 'Service 4WD' dashboard messages and transfer case stuck in default gear. Some vehicles become unshiftable; others require replacement of the transfer case motor or range sensor. Owners describe the software reflash as creating rather than solving the original neutral-shifting problem.

When: Immediately after N23 recall work (typically 2013-2014); symptoms appear on first attempt to engage 4WD Low or Neutral post-recall

Symptoms owners cite: Cannot shift into 4WD Low; Cannot shift transfer case to Neutral (problematic for flat towing); Service 4WD warning message on dashboard; Transfer case stuck in one gear; 4WD High also fails to engage; Rear thumping noise reported in some cases

Codes mentioned: Service 4WD message (EVIC display), Transmission light illumination

Repairs/costs cited: Dealers replace transfer case motor (backorder status; some shops reported one unit per 14 days availability), range sensor, or entire transfer case module. Cost cited at ~$500 for motor alone. Owners report Chrysler often refuses warranty coverage, claiming N23 work not responsible. Software cannot be reverted to pre-recall version.

Recalls/TSBs owners mention: Recall N23 (NHTSA 13V-175); Chrysler claims hardware failure unrelated to recall, offers paid diagnostics followed by paid repairs if codes confirm; warranty denials despite widespread post-recall pattern; no TSB or corrective software update issued; dealers left uninformed of problem despite internal service bulletins circulating online.

Engine shuts off completely without warning while driving at speeds ranging from 20 mph to 70+ mph, often on highways. Power steering and brakes become inoperative. Vehicle requires restart; no warning lights precede failure. Many stalls occur under load (acceleration, hills), in damp/rainy weather, or over bumps/rail crossings. Dealers unable to replicate or diagnose despite multiple visits and repair attempts. Some owners report stalling became permanent after electrical system recalls (13V-175, 14V567000).

When: Intermittent, occurring 4–6 times per year or monthly; can happen at idle, acceleration, or steady cruising

Symptoms owners cite: Complete loss of engine power while driving; Loss of power steering and power brakes; No warning lights before shutdown; Engine dies with no restart attempt needed—turns over after cooldown; Check Engine Light and electrical warning lights may illuminate; Occurs sporadically; sometimes weeks between incidents

Codes mentioned: Check Engine Light (generic/non-specific codes), Electronic Stability Control (ESC) warning lights, ABS, Battery lights reported in some cases

Repairs/costs cited: Dealers unable to diagnose in most cases; spark plug replacement suggested (star case noted); vehicle restarts on neutral-to-restart cycle. No permanent fix documented in these narratives.

Recalls/TSBs owners mention: No recalls issued specifically for 2008 model stalling; 2007 models have similar recall; dealer diagnostics inconclusive; one case references star case S1218000003 for spark plug change only.

At 41,138 miles, transmission lost drive capability—vehicle would barely move at 10 mph, stalled when stopped, required repeated restarts. Jeep dealer confirmed 'early major transmission failure' out of all warranties. Owner reports transmission fluid burnt despite normal fill level. Chrysler acknowledges early failure but denies warranty coverage (5/50k powertrain warranty not honored). Repair cost $3,934.73; Chrysler offered only $1,500 reimbursement, which owner refused.

When: 41,138 miles; incident occurred 8/9/2012

Symptoms owners cite: Vehicle moves only 10 mph maximum; Forward progress stops entirely when vehicle is halted; Requires park, engine off, restart cycle to regain mobility; Cannot accelerate sufficiently to cross highway lanes safely

Codes mentioned: Transmission failure (dealer diagnosis)

Repairs/costs cited: $3,934.73 transmission repair cost; fluid was burnt; full transmission rebuild/replacement performed

Recalls/TSBs owners mention: Admits early failure; refuses full powertrain warranty coverage (claims 5/50k does not apply); offers partial reimbursement ($1,500) rejected by owner; no investigation into failure root cause despite safety concern at highway speeds.

Chronic electrical system failures stemming from ignition switch operation: engine starts but vehicle cannot shift out of Park until key jiggled; radio/navigation inoperative until ignition switch manipulated. Electronic throttle fails intermittently—loss of throttle control while driving, dangerous loss of acceleration; recovered only by stopping and restarting engine multiple times. Dealerships unable or unwilling to repair despite full and extended warranties; problems sporadic and random, so dealers refuse repair. Ignition cylinder and wireless module may be subject to unpublished recall (P57). Some Jeep dealers refuse to acknowledge recall applicability by VIN.

When: Ignition issues began 2009; ongoing throughout ownership; electronic throttle failures sporadic

Symptoms owners cite: Engine starts but vehicle locked in Park; shift interlock inoperable; Radio and navigation system fail to operate; Erratic electrical system behavior tied to ignition switch movement; Electronic throttle loss—no accelerator response mid-drive; Specific idiot lights illuminate (throttle warning light); Multiple near-miss accidents from throttle loss; Rapid unintended acceleration reported by car wash (safety risk)

Codes mentioned: Check Engine Light (unspecified codes), Electronic throttle warning light

Repairs/costs cited: Dealers conduct 'reprogramming' but problems persist. No repairs completed under warranty despite coverage. Diesel variant blamed for throttle issues by some dealers (unsubstantiated).

Recalls/TSBs owners mention: Recall P57 (ignition cylinder/wireless module) may apply but VIN exclusions claimed by dealers; key fob replaced in 2009 due to ignition switch failure; Chrysler refused key assembly replacement citing VIN number issue despite identical modules being replaced on other vehicles; multiple reprogramming attempts documented with no resolution.

Shift interlock system fails—vehicle shifts gears without driver input or shifts from Park to Reverse without brake pedal depressed. In one incident, vehicle rolled while parked; in another, driver's leg accidentally struck shift lever while woman was in Park on icy driveway, and jeep went into Reverse without brake applied, nearly dragging driver under vehicle (open door scooped driver toward undercarriage). Shift control and interlock system non-functional. Ignition switch malfunction often associated.

When: Incidents at 130,000 miles and on icy driveway (timing unclear); sporadic failures

Symptoms owners cite: Vehicle shifts into Reverse without brake pedal applied; Unintended gear shifts while parked or driving; Vehicle rolls despite Park position (one case: rolled out of parking space and into wooded area); Shift interlock system non-responsive

Codes mentioned: Check Engine Light (related to ignition/shift control)

Repairs/costs cited: One owner paid for transfer case actuator and harness replacement prior to N23 recall; Chrysler refused reimbursement despite recall language matching symptoms.

Recalls/TSBs owners mention: Recall N23 language cited by owner for reimbursement; Chrysler denied reimbursement claim despite stated language matching unintended shift/roll symptoms in recall description.

Vehicle accelerates on its own or shifts into Reverse unexpectedly. One owner reported vehicle accelerated to 50+ mph without throttle input after initial bucking/power loss cycle; another reported sudden reverse engagement while pulling into parking garage. Chrysler inspector's findings not shared with owner; manufacturer accused of lying about inspection completion.

When: Incident at 2,511 miles (reverse engagement); other timing variable

Symptoms owners cite: Rapid unintended acceleration (30 mph to 50+ mph without pedal input); Bucking sensation (losing power and regaining it); Sudden Reverse engagement without driver action; Vehicle continues accelerating despite neutraling

Repairs/costs cited: One case involved collision with preceding vehicle in parking garage; police report taken (White Plains PD #08-10826).

Recalls/TSBs owners mention: Chrysler sent 'independent' inspector but refused to share findings; owner alleges Chrysler lied about inspection feasibility; dealer test drove and confirmed issues but no repair action documented.

Transfer case shifts into 4WD Low on its own while driving in parking lot; vehicle cannot maintain Park and rolls. Rear differential assembled 'out of spec' and failed catastrophically, causing violent swerve (all wheels stopped spinning) on highway at posted speed; vehicle crossed two lanes and nearly rolled into median. Wife refuses to drive vehicle again after incident.

When: Parking lot incident and highway swerve (timing not specified); differential failure under normal driving

Symptoms owners cite: Transfer case shifts into 4WD Low spontaneously while driving; Vehicle cannot maintain Park; rolls out of parking space; Violent wheel lockup at highway speed (described as 'all wheels suddenly stopped spinning'); Vehicle swerves off right shoulder, crosses two lanes, veers off left shoulder toward embankment

Repairs/costs cited: Transfer case actuator and harness replaced; differential was rebuilt (out-of-spec assembly confirmed by service manager).

Recalls/TSBs owners mention: Differential rebuilt; no recall or design change mentioned; service manager attributed to out-of-spec assembly only.

Complete electrical system shutdown while driving. All warning lights illuminate simultaneously (ABS, Check Engine, Battery, etc.), then flicker and fail. Headlights dim severely, then extinguish. Windshield wipers slow drastically. Vehicle fails to accelerate. All electrical power lost; tow required. Related to broader electrical recalls (13V-175, 14V567000) but issues persist or recur after recall work.

When: Incident occurred while driving in rain; sporadic recurrence

Symptoms owners cite: All warning lights come on at once; Lights flicker; Headlights dim then turn off completely; Windshield wipers operate very slowly; Vehicle loses acceleration capability; Complete loss of all electrical power

Codes mentioned: ABS, Check Engine, Battery, and all warning lights (simultaneous illuminate)

Repairs/costs cited: Vehicle required tow; unable to restart after loss of power.

Recalls/TSBs owners mention: Recalls 13V-175 and 14V567000 (electrical system) issued; one owner reports failure recurred after repair under these campaigns.

Intermittent hesitation when engaging accelerator pedal. Vehicle stalls without warning on multiple occasions; some stalls occur after periods of running fine (weeks/months between events). When stalled, must shift into Neutral, wait, and restart multiple times. Vehicle sometimes fails to restart. Dealer unable to diagnose on three occasions.

When: Sporadic; sometimes weeks or months between stalls; failure mileage noted at 61,300 miles

Symptoms owners cite: Hesitation when pressing accelerator pedal; Vehicle stalls without warning at various speeds; Difficulty restarting (multiple attempts required); Must shift to Neutral and wait before restart attempts work

Repairs/costs cited: No repairs completed; dealer unable to diagnose after three visits.

Recalls/TSBs owners mention: Manufacturer made aware; no recall action or repair protocol documented.

Driver-side exhaust manifold bolts break, causing exhaust leak that sputters from driver-side engine compartment. Described as common issue affecting 'all' 5.7L HEMI engines in Chrysler vehicles; multiple mechanics and Chrysler technicians confirm prevalence. Cost to replace manifold and drill out broken bolts approximately $700.

When: Occurs at some point during vehicle ownership; pattern suggests 5-8 year mark typical

Symptoms owners cite: Exhaust sputter from driver-side engine compartment; Visible exhaust leak

Repairs/costs cited: $700 approximate cost to replace manifold and drill out broken bolts.

Recalls/TSBs owners mention: No recall issued; cost passed to consumer; known issue among mechanics and Chrysler technicians.

Following N23 recall work, owner receives 'Service 4WD System' light. Certified mechanic clears error code, but it returns within a day. Dealer diagnoses bad transfer case range sensor—the very component affected by the recall flash. Part is on massive backorder (500+ units); dealer can order only one every 14 days. Owner reports many others have same problem post-recall.

When: Begins after N23 recall software update

Symptoms owners cite: Service 4WD System light illuminates; Error code persists after clearing

Codes mentioned: Service 4WD System (EVIC code)

Repairs/costs cited: Transfer case range sensor replacement required; part severely backorder due to widespread post-recall failures.

Recalls/TSBs owners mention: Recall N23 performed; dealer confirms part shortage directly attributable to high post-recall failure rate.

Vehicle will not start—dash lights up but engine will not crank. Battery and starter tested OK. Occurs intermittently over months/years; sometimes resolves after hours or days of sitting. Always occurs when parked (vehicle not moving). Dealer demands owner pay for tow and diagnostic; if diagnostic finds nothing, owner pays additional $120 diagnostic fee and must arrange separate tow. This pattern has occurred repeatedly over past year.

When: Intermittent, recurring over one-year period; 4WD software updates (N23 type) recently performed

Symptoms owners cite: Dashboard lights up but engine does not turn over; No-crank condition; Resolves spontaneously after hours or days; Occurs only when vehicle is parked

Repairs/costs cited: Dealer unwilling to cover diagnostic costs; owner left with $120-200+ per incident for tow and diagnosis.

Recalls/TSBs owners mention: N23 recall software updates performed; no known service bulletins addressing post-update no-start condition.

Upper differential housing insulator and pinion seals fail prematurely. At 56,000 miles (5-year-old vehicle), owner informed seals are leaking and insulators need replacement—considerable cost. Owner reports multiple service bulletins exist for this issue, but Chrysler refuses coverage due to expiration of 3-year/36,000-mile warranty. Components should last longer than 56k miles on a properly maintained vehicle.

When: 56,000 miles

Symptoms owners cite: Differential fluid leak; Visual leak confirmation

Repairs/costs cited: Parts replacement cost described as 'considerable'; service bulletins reference this issue.

Recalls/TSBs owners mention: Refuse warranty coverage; warranty limits (3/36k) expired; multiple service bulletins issued but no recall or extended coverage program.

While driving at 50 mph, vehicle lost power—accelerator pedal depressed but vehicle failed to accelerate. Failure recurred on numerous occasions. Owner's VIN included in electrical recall (15V470000) but required part unavailable; Chrysler exceeded reasonable timeframe for repair part availability.

When: Multiple occurrences at 80,000 miles

Symptoms owners cite: Loss of power while driving; Vehicle fails to accelerate despite pedal input

Repairs/costs cited: Recall 15V470000 (electrical system) identified as applicable; part remains unavailable indefinitely.

Recalls/TSBs owners mention: Recall 15V470000 (electrical system) issued; part unavailable for extended period beyond reasonable timeframe.

Owner took vehicle in for Recall P73; dealer attempted to upsell $1,000+ in unnecessary services (oil changes, etc.) claiming 4-hour job required 2 days. Dealer demanded additional $130 to replace allegedly 'badly corroded' transfer case connector that was not actually corroded. Owner called FCA; FCA confirmed recall work was marked complete but was never performed. Dealer also failed to address needed transfer case motor replacement (which some vehicles require as part of recall). Owner left with incomplete recall work and safety concerns.

When: Recent (after P73 recall issuance)

Symptoms owners cite: Recall work not performed despite dealer claim; Transfer case motor issue unaddressed

Repairs/costs cited: Dealer charged $1,000+ for unnecessary work; transfer case motor replacement cost not specified.

Recalls/TSBs owners mention: Recall P73 issued; FCA records showed work complete when it was not; dealer fraud allegation; no corrective action documented.