RAM ProMaster Problems: 7 Issues Every Owner Should Know
2014-2025 model years · Based on 12,950+ owner reports · Last updated March 2026
According to Au7o's analysis of 12,950+ owner reports, the 2014-2025 RAM ProMaster has 7 documented known issues, with 4 rated critical by the Au7o research team. The most serious are 3.6L Pentastar V6 Oil Filter Housing/Cooler Leak ($150-$800 repair), ZF 9HP 9-Speed Automatic Transmission Problems ($0-$5,000 repair), Electrical System Faults and Stalling ($200-$1,200 repair) and Brake Booster Failure and Reduced Braking Power ($50-$800 repair). The most commonly reported issue is 3.6L Pentastar V6 Oil Filter Housing/Cooler Leak with 2,900 owner reports. Across all issues, repair costs range from $0 to $5,000. Full technical analysis and DIY maintenance guides at au7o.io.
All 7 Known Issues
The RAM ProMaster City has a known brake booster failure issue that causes a hard brake pedal and dramatically increased stopping distances. The vacuum brake booster develops internal leaks, losing its ability to amplify brake pedal force. Some owners report the brake pedal becoming extremely hard with little warning, requiring excessive force to stop the vehicle. NHTSA opened an investigation (EA19-003) after receiving hundreds of complaints. This is a critical safety issue as the vehicle may not stop in time during emergency braking. Some vehicles also have the brake booster check valve fail, causing similar symptoms.
Common Symptoms
- Hard brake pedal requiring excessive force
- Dramatically increased stopping distance
- Hissing sound from brake booster area
- Brake pedal does not depress normally
- Vehicle feels like it has no power brakes
- ABS warning light illuminated
- Engine idle fluctuates when pressing brake pedal
How to Fix
Diagnose by checking brake booster vacuum with a gauge (should hold 20+ inHg). Check the brake booster check valve first ($15-30 replacement) as it is a common and cheap failure point. If the booster itself is failed, replace the brake booster assembly ($400-800, Mopar 68233387AA). The booster replacement requires removing the master cylinder and working under the dashboard. Check if your VIN is covered under NHTSA investigation EA19-003 for potential recall coverage. After replacement, bleed the entire brake system.
What Owners Are Using
Parts and tips from 1,100+ owners who fixed this issue
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The RAM ProMaster experiences premature front brake rotor warping and accelerated brake pad wear, particularly when the van is loaded with cargo or upfitted as a camper/work van. The front brakes do approximately 70-80% of the braking on the FWD ProMaster, and the factory rotors and pads are not adequately sized for the vehicle weight. Brake pulsation/vibration when stopping appears as early as 15,000-25,000 miles. NHTSA has received numerous complaints about premature brake wear. The factory brake pads often last only 20,000-30,000 miles under heavy use. Rotor and pad replacement: $300-600 for both front axles.
Common Symptoms
- Brake pedal pulsation when stopping
- Steering wheel vibration during braking
- Brake squeal or grinding noise
- Longer stopping distances
- Brake pedal feels soft or spongy
- Visible scoring or grooves on rotors
- Brake dust accumulation much heavier on front wheels
How to Fix
Replace warped rotors with upgraded aftermarket options: PowerStop Z36 Truck & Tow kit (K6539-36) includes drilled/slotted rotors and carbon-fiber ceramic pads designed for heavy vehicles ($250-350 for front axle). EBC Yellowstuff pads are another popular upgrade for heavy-use ProMasters. Machine the factory rotors only if they have adequate thickness remaining (minimum spec: 28mm). Flush brake fluid every 2 years (DOT 4). Proper break-in procedure for new pads/rotors is critical: 30 moderate stops from 35 mph with cooling between stops.
What Owners Are Using
Parts and tips from 2,100+ owners who fixed this issue
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The RAM ProMaster with the 3.6L Pentastar V6 engine suffers from a well-known oil filter housing/cooler leak. The oil filter housing is mounted to the side of the engine block and contains an integrated oil cooler. The gaskets and O-rings that seal the housing deteriorate over time, causing oil to leak externally (visible drip on the ground) and/or internally (oil mixing with coolant). If oil enters the cooling system, it destroys the coolant and can cause overheating. The leak typically appears between 40,000-80,000 miles. This is the same issue that affects all Pentastar 3.6L vehicles (Jeep, Dodge, Chrysler). Mopar updated the housing design (68105583AF) with improved seals.
Common Symptoms
- Oil dripping from passenger side of engine
- Oil level dropping between changes
- Milky residue on oil cap or dipstick (oil/coolant mix)
- Coolant level dropping with no visible external leak
- Overheating due to contaminated coolant
- Oil spots under van on passenger side
- Burning oil smell from engine bay
How to Fix
Replace the oil filter housing assembly with the updated Mopar part (68105583AF) which includes improved gaskets and O-rings. The repair involves draining coolant, removing the intake manifold for access, unbolting the old housing, cleaning surfaces, and installing the new housing with fresh gaskets. Cost: $400-800 at a shop, $150-250 DIY for parts. If oil has entered the coolant, flush the entire cooling system at least twice. Check coolant condition for contamination (milky appearance).
What Owners Are Using
Parts and tips from 2,900+ owners who fixed this issue
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The RAM ProMaster City uses the ZF 9HP48 9-speed automatic transmission which is plagued with harsh shifting, delayed engagement, gear hunting, and premature failure. The transmission struggles with low-speed maneuvers, often jerking or hesitating during parking lot driving. Some owners report the transmission failing to shift out of first gear or getting stuck in gear. Multiple TSBs have been issued for shift quality calibration (TSB 21-008-18 REV.C). The 9HP has been the subject of class-action lawsuits across multiple Stellantis vehicles. TCM software updates may help but many trucks need valve body replacement ($1,200-2,000) or complete transmission rebuild ($3,000-5,000).
Common Symptoms
- Harsh or jerky shifting at low speeds
- Hesitation when accelerating from stop
- Transmission hunting between gears
- Stuck in one gear (fails to upshift)
- Clunking when shifting into Drive or Reverse
- Delayed engagement (2-3 second delay)
- Check engine light with transmission fault codes
How to Fix
Start with TCM software update at dealer (free under warranty), reference TSB 21-008-18 REV.C. Have dealer perform transmission adaptation reset after update. If shifts remain harsh, request valve body inspection/replacement ($1,200-2,000). Ensure correct ZF 9-speed fluid is used (Mopar 68218925AA). Complete fluid change (not just drain and fill) every 40,000 miles. If transmission has failed completely, replacement/rebuild costs $3,000-5,000. Some owners opt for remanufactured transmissions from Jasper or AAMCO.
What Owners Are Using
Parts and tips from 1,950+ owners who fixed this issue
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The RAM ProMaster City experiences various electrical system failures including random stalling, no-start conditions, instrument cluster blackouts, and multiple warning lights illuminating simultaneously. The Body Control Module (BCM) and Powertrain Control Module (PCM) are common failure points. Some vehicles stall while driving with no warning, creating dangerous situations. NHTSA has received hundreds of stalling complaints. The alternator and battery drain issues compound the electrical problems. TSB 08-048-19 addresses instrument cluster and BCM communication faults. PCM replacement: $600-1,200; BCM replacement: $400-800.
Common Symptoms
- Engine stalls while driving without warning
- Multiple warning lights illuminate simultaneously
- Instrument cluster goes blank or flickers
- Vehicle will not start (no crank, no start)
- Intermittent power loss to accessories
- Battery dies repeatedly despite replacement
- Check engine light with multiple communication codes (U-codes)
How to Fix
Diagnose with wiTECH scan tool to check for communication faults (U-codes) between modules. Check TSB 08-048-19 for BCM and instrument cluster communication fixes. Common repairs: BCM replacement and programming ($400-800), PCM replacement and programming ($600-1,200), alternator replacement ($400-600). Check all ground connections, especially the main engine ground strap, for corrosion. Some stalling issues are resolved with a PCM software update. Battery should be AGM type with proper CCA rating.
What Owners Are Using
Parts and tips from 1,650+ owners who fixed this issue
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The RAM ProMaster sliding side door experiences cable failures, roller wear, alignment problems, and difficulty opening/closing. The door cable (which assists the sliding mechanism) frays and breaks, causing the door to jam in the open or closed position. The upper and lower rollers also wear out prematurely, causing the door to sag, scrape, and become difficult to operate. This is a significant issue for commercial users who open/close the door dozens of times per day. TSB 23-024-20 addresses sliding door cable and roller inspection/replacement. Cable replacement: $300-600; complete roller/track overhaul: $500-1,000.
Common Symptoms
- Sliding door difficult to open or close
- Door jams partway open or closed
- Grinding or scraping noise when operating door
- Door sags when opened (bottom drags)
- Cable visible hanging or frayed
- Door does not latch properly when closed
- Excessive force required to slide door
How to Fix
Inspect the door cable for fraying (visible at the bottom track area). Replace the cable assembly (Mopar 68256321AA or 68256322AA for left/right) - cost: $100-200 for parts, $200-400 labor. Inspect and replace worn upper and lower rollers if they show flat spots or excessive play. Lubricate the track and rollers with white lithium grease every 10,000 miles to extend life. For alignment issues, adjust the striker and latch mechanism. Check TSB 23-024-20 for the complete inspection and replacement procedure.
What Owners Are Using
Parts and tips from 1,800+ owners who fixed this issue
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The RAM ProMaster, particularly the high-roof models, develops water leaks at the roof seams, around the roof-mounted accessories (antenna, running lights), and at the fiberglass high-top to metal body joint. Water enters during rain or car washes, dripping into the cargo area and cab. The leak points are: 1) Factory roof seam sealant that cracks over time, 2) High-top fiberglass joint where the roof extension meets the metal body, 3) Antenna and marker light gaskets that deteriorate. For van life/camper conversions, any roof penetrations (solar panels, fans, vents) exacerbate the issue. Left untreated, roof leaks cause interior mold and body corrosion.
Common Symptoms
- Water dripping inside cargo area during rain
- Damp spots or stains on headliner
- Water running down interior walls
- Musty or mold smell inside van
- Visible rust or corrosion at roof seams
- Water pooling on floor during heavy rain
- Water dripping from marker lights or antenna area
How to Fix
Inspect all roof seams, antenna mounting, and marker light gaskets. Clean and reseal roof seams with Sikaflex 221 or Dicor self-leveling lap sealant. Replace deteriorated marker light and antenna gaskets ($5-15 each). For the high-top joint, clean old sealant and apply a continuous bead of Sikaflex 221. For van conversions with roof penetrations, ensure all solar panel, fan, and vent installations use proper butyl tape and Dicor sealant. Cost: $30-100 for DIY sealant repairs; $300-800 for professional roof seam resealing.
What Owners Are Using
Parts and tips from 1,450+ owners who fixed this issue
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Frequently Asked Questions
What are the most common RAM ProMaster problems?
According to Au7o's analysis of 12,950+ owner reports, the 2014-2025 RAM ProMaster has 7 documented issues. The most frequently reported are: 3.6L Pentastar V6 Oil Filter Housing/Cooler Leak, ZF 9HP 9-Speed Automatic Transmission Problems, Electrical System Faults and Stalling. Of these, 4 are rated critical and should be addressed promptly.
Is the RAM ProMaster reliable?
The 2014-2025 RAM ProMaster has 7 known issues documented across 12,950+ owner reports. 4 issues are rated critical: 3.6L Pentastar V6 Oil Filter Housing/Cooler Leak and ZF 9HP 9-Speed Automatic Transmission Problems and Electrical System Faults and Stalling and Brake Booster Failure and Reduced Braking Power. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
How much does it cost to fix common RAM ProMaster problems?
Repair costs for known RAM ProMaster issues range from $0 to $5,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, 3.6L Pentastar V6 Oil Filter Housing/Cooler Leak, typically costs $150-$800 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What year RAM ProMaster is the most reliable?
Reliability varies across model years of the RAM ProMaster. Based on owner reports, issues are most commonly reported in earlier model years. Au7o recommends checking the specific known issues for your target year before purchasing, and having a pre-purchase inspection performed by a qualified mechanic. Our known issues database covers the 2014-2025 RAM ProMaster with 7 documented issues from 12,950+ owner reports.
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