C0071 on Ford: How to Diagnose & Fix
Brake Switch Circuit
1 Ford model · 1 documented issue · 1 critical · $1,200-$3,500 repair
C0071 on Ford by model: symptoms, diagnosis and fix
NHTSA recall 15V340 covers 2011-2012 Ford Fusion without the 3.5L engine (plus Lincoln MKZ Hybrid and 2011 Mercury Milan). A steering motor sensor fault can cause the electric power steering assist to shut down while driving. Owners notice heavier steering effort especially at low speeds, increasing crash risk. Dealers check the Power Steering Control Module (PSCM) for DTCs; if any loss-of-assist codes are stored, the steering gear is replaced free. 2010 Fusions had the same parts but were not included in the recall; NHTSA closed its investigation without adding 2010 models. 2010 owners can see the same symptoms, but those cars are not covered by the recall.
Common Symptoms
- Power steering warning message on dashboard
- Steering becomes heavy or requires extra force
- Intermittent loss of power steering assist
- Steering wheel off-center after loss of assist
- Clunking or grinding from steering column area
- Complete loss of power steering (requires significant force to turn)
- Steering assist comes and goes unpredictably
- Check engine light or power steering fault code stored
How to Fix
Check if your vehicle is covered under Ford recall (2011-2012 Fusion/MKZ power steering failure recall - free repair). For non-recall vehicles, the electric power steering rack must be replaced as a complete unit since the motor and control electronics are integrated. RepairPal estimates $1,958-3,362 installed. Remanufactured racks from PWR Steer or Cardone are available at $800-1,500, significantly cheaper than new OEM ($2,000+). Have the alignment performed after rack replacement.
Sources for this issue (1)
C0071 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does C0071 mean on a Ford?
C0071 stands for "Brake Switch Circuit." C0071 is a chassis code indicating a fault in the brake switch (brake light/brake pedal switch) circuit, as seen by the ABS or stability control module. The brake switch tells modules when the brake pedal is pressed, which the ABS/traction/stability systems use to coordinate their operation. The code sets when the brake switch signal is implausible, missing, or electrically inconsistent. Symptoms can include an ABS or traction control warning light, disabled stability features, cruise control that won't engage, or brake lights that behave incorrectly. On Ford it is documented across 1 model: Fusion.
What are the most common causes of C0071?
The most common causes of C0071 are: Faulty or misadjusted brake light switch, Damaged wiring or connector at the brake switch, Corroded or loose connector terminals, Blown brake light fuse, Open or short in the brake switch circuit, Poor ground for the switch circuit, Faulty ABS/control module input (less common). The specific cause varies by vehicle.
How much does it cost to fix C0071 on a Ford?
Published repair estimates on Ford range from $1,200 to $3,500 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.