What is the 2010-2019 Ford Fusion 6F35 6-Speed Automatic Harsh/Delayed Shifting and Torque Converter Shudder?

The 6F35 six-speed automatic is prone to harsh, banging, or delayed shifts (most often 2-3 and 3-4) plus a shudder/vibration when the torque converter clutch locks up at a steady 40-60 mph cruise. Root causes are worn valve-body separator-plate O-rings and bores that can no longe… Repairs typically run $250-$3,500. Severity: high.

What is the 2010-2019 Ford Fusion AWD Power Transfer Unit (PTU) Overheating and Fluid Leak Failure?

On AWD Fusions the Power Transfer Unit holds only about a quart of gear oil with no dipstick, service interval, or cooling, sitting next to hot exhaust and transaxle. The fluid cooks and breaks down, becoming thick, gummy, and black, and the seals leak. Owners report a burning sm… Repairs typically run $400-$3,100. Severity: high.

What is the 2010-2016 Ford Fusion Electronic Throttle Body Failure - Limp Mode and Wrench Light?

The electronic throttle body suffers internal contamination/wear of the motor contacts, causing intermittent electrical failure rather than simple dirt buildup. The result is a sudden loss of power (limp/failsafe mode) with the amber wrench (powertrain) warning light, rough idle,… Repairs typically run $250-$550. Severity: high.

What is the 2006-2020 Ford Fusion HVAC Blend Door Actuator Failure - Clicking/Knocking Behind Dash, No Heat or AC?

The plastic gears inside the HVAC blend-door actuator strip out, so the door can no longer move to route air correctly. The classic symptom is a repeated clicking or knocking noise from behind the dash (often at startup or when changing temperature), along with air stuck on one t… Repairs typically run $156-$400. Severity: medium.

What is the 2010-2018 Ford Fusion Parasitic Battery Drain - Dead Battery / No Start (BCM & Modules)?

Many Fusion owners report the battery going dead overnight or over a weekend from a parasitic draw. Common culprits are a module that fails to sleep - Body Control Module (BCM), APIM/infotainment, or amplifier - as well as the PATS anti-theft transceiver circuit on earlier cars. Repairs typically run $150-$1,000. Severity: medium.

What is the 2010-2012 Ford Fusion EVAP Purge Valve Stuck/Leaking - Check Engine Light and Rough Running?

The under-hood evaporative-emissions purge valve on 2010-2011 Fusion/Milan (2.5L DOHC and 3.0L) built on or before 3/4/2011 can stick open or leak, unmetered vapor entering the intake. This lights the MIL and sets a cluster of EVAP and lean/fuel-trim codes, and can cause rough id… Repairs typically run $100-$300. Severity: low.

Ford · Known Issues

2010 Ford Fusion Problems: 8 Known Issues

2010 model year · 1,400+ owner reports · Updated September 2026

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According to Au7o's analysis of 1,400+ owner reports, the 2010 Ford Fusion has 8 documented known issues, with 5 rated critical. The most serious are Hybrid High-Voltage Battery Degradation and Failure ($1,500-$7,000 repair), ABS Hydraulic Control Unit Valves Stick Open - Long Brake Pedal Travel (Recall 19V904 / Ford 19S54), 6F35 6-Speed Automatic Harsh/Delayed Shifting and Torque Converter Shudder ($250-$3,500 repair), AWD Power Transfer Unit (PTU) Overheating and Fluid Leak Failure ($400-$3,100 repair) and Electronic Throttle Body Failure - Limp Mode and Wrench Light ($250-$550 repair). The most commonly reported issue is Hybrid High-Voltage Battery Degradation and Failure with 1,400 owner reports. Across all issues with published estimates, repair costs range from $100 to $7,000. DIY maintenance guides at au7o.io.

All 8 Known Issues

Frequently Asked Questions

What are the most common Ford Fusion problems?

According to Au7o's analysis of 1,400+ owner reports, the 2010 Ford Fusion has 8 documented issues. The most frequently reported are: Hybrid High-Voltage Battery Degradation and Failure, ABS Hydraulic Control Unit Valves Stick Open - Long Brake Pedal Travel (Recall 19V904 / Ford 19S54), 6F35 6-Speed Automatic Harsh/Delayed Shifting and Torque Converter Shudder. Of these, 5 are rated critical and should be addressed promptly.

Is the Ford Fusion reliable?

The 2010 Ford Fusion has 8 known issues documented across 1,400+ owner reports. 5 issues are rated critical: Hybrid High-Voltage Battery Degradation and Failure and ABS Hydraulic Control Unit Valves Stick Open - Long Brake Pedal Travel (Recall 19V904 / Ford 19S54) and 6F35 6-Speed Automatic Harsh/Delayed Shifting and Torque Converter Shudder and AWD Power Transfer Unit (PTU) Overheating and Fluid Leak Failure and Electronic Throttle Body Failure - Limp Mode and Wrench Light. 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 Ford Fusion problems?

Repair costs for known Ford Fusion issues range from $100 to $7,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Hybrid High-Voltage Battery Degradation and Failure, typically costs $1,500-$7,000 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 2010-2020 Ford Fusion Hybrid High-Voltage Battery Degradation and Failure?

Ford Fusion Hybrid spans two generations with different high-voltage batteries — degradation patterns differ. 1st-gen 2010-2012 (NiMH, ~1.4 kWh): typical degradation appears at 100,000-150,000 miles with reduced EV-mode range and increased ICE intervention. Replacement runs $2,50… Repairs typically run $1,500-$7,000. Severity: high.

All 8 Known Issues

2010-2020 Ford Fusion: Hybrid High-Voltage Battery Degradation and Failure#

2010-2018 Ford Fusion: Parasitic Battery Drain - Dead Battery / No Start (BCM & Modules)#

2006-2010 Ford Fusion: ABS Hydraulic Control Unit Valves Stick Open - Long Brake Pedal Travel (Recall 19V904 / Ford 19S54)#

2010-2019 Ford Fusion: 6F35 6-Speed Automatic Harsh/Delayed Shifting and Torque Converter Shudder#

2010-2019 Ford Fusion: AWD Power Transfer Unit (PTU) Overheating and Fluid Leak Failure#

2010-2016 Ford Fusion: Electronic Throttle Body Failure - Limp Mode and Wrench Light#

2006-2020 Ford Fusion: HVAC Blend Door Actuator Failure - Clicking/Knocking Behind Dash, No Heat or AC#

2010-2012 Ford Fusion: EVAP Purge Valve Stuck/Leaking - Check Engine Light and Rough Running#

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