C0051: How to Diagnose & Fix — LF Wheel Speed Sensor Circuit Range/Performance
4 vehicles · 2 makes · $100-$3,500 repair
How to diagnose and fix C0051: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Ford Fusion · 2011–2013
NHTSA recall 15V340 covers 2011-2013 Ford Fusion (and Lincoln MKZ) without the 3.5L engine. An intermittent electrical connection in the steering gear can cause sudden loss of electric power steering assist 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. Note: 2010 Fusions had the same parts but were excluded from the recall — feds closed the probe without expanding scope. 2010-owner symptoms are real but uncovered by 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)
Ford Escape · 2013–2022
The 2013-2022 Escape uses an electric power steering (EPS) rack that can fail, causing heavy steering, intermittent loss of power assist, or a steering warning light. The EPS motor or torque sensor within the rack assembly can malfunction due to heat and electrical issues. When the system faults, the steering becomes extremely heavy and difficult to turn, especially at low speeds. This is a safety concern particularly during parking maneuvers.
Common Symptoms
- Steering becomes very heavy suddenly
- Power steering warning light on dashboard
- Steering assist intermittently cuts out
- Grinding or whining noise when turning
- Steering wheel off-center after restart
How to Fix
A software update may resolve intermittent EPS faults — have the dealer check for TSBs first. If the rack itself has failed, replacement is necessary. OEM rack costs $800-1,200; aftermarket remanufactured racks are $400-700. Labor is $300-500. Total repair: $700-1,700. Some owners have had success with cleaning the EPS motor connector and applying dielectric grease for intermittent failures.
Sources for this issue (1)
Ford F-150 · 2013–2018
The brake master cylinder rear cup seal can roll or fail, allowing brake fluid to leak from the front-circuit reservoir into the brake booster. This drops fluid in the front brake circuit and can reduce or eliminate front-wheel braking (rear brakes remain). Drivers report a long/soft pedal traveling near the floor, a brake warning light, and a low reservoir often with no visible external leak. The defect has driven repeated recalls on 3.5L EcoBoost trucks — 16S24 (2013-2014), 22V-150 (2017-2018), and 25V-236/25S37 (2017-2018) — and caused documented non-injury crashes.
Common Symptoms
- Brake pedal sinks toward the floor
- Increased pedal effort / hard pedal
- Red brake warning light and low-fluid chime
- Reservoir repeatedly low with no external leak
- Reduced front braking, longer stopping distance
How to Fix
Have the VIN checked for open recalls (16S24, 22V-150, 25S37) — the master cylinder is replaced free of charge, and the brake booster is also replaced if it shows evidence of fluid contamination. Outside recall coverage, replace the master cylinder (and booster if soaked). Do not ignore a recurring low reservoir or any change in pedal travel/effort; this is a loss-of-braking safety condition.
Sources for this issue (3)
RAM 3500 · 2010–2025
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C0051 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 C0051 mean?
C0051 stands for "LF Wheel Speed Sensor Circuit Range/Performance." C0051 is a chassis/brake code meaning the ABS module is reading an unreliable or out-of-range signal from the Left Front (LF) wheel speed sensor. The sensor counts how fast that wheel turns by sensing teeth on a tone ring, and the computer expects its signal to track logically with the other three wheels. When the LF reading is erratic, intermittent, or doesn't match vehicle speed, the module sets this 'range/performance' code. It generally means the data is present but doesn't make sense, which can disable ABS, traction control, and stability control until corrected.
What are the most common causes of C0051?
The most common causes of C0051 are: Metal debris, rust, or brake dust contaminating the LF sensor or tone ring, Damaged or cracked tone/reluctor ring teeth on the hub or axle, Faulty or worn left front wheel speed sensor, Excessive air gap from a loose sensor or worn wheel bearing, Corroded or loose sensor connector at the wheel, Chafed, pinched, or broken sensor wiring near the strut, Mismatched or incorrect tire size affecting signal plausibility. The specific cause varies by vehicle.
How much does it cost to fix C0051?
Repair costs for C0051 range from $100 to $3,500, depending on the vehicle and root cause.
Which vehicles are affected by C0051?
Au7o has documented C0051 across 4 vehicle models from 2 manufacturers: Ford, RAM.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.