C1011 on RAM: How to Diagnose & Fix
Left Front Wheel Speed Sensor Signal Erratic Performance
1 RAM model · 1 documented issue · 1 critical · $1,800-$4,000 repair
C1011 on RAM by model: symptoms, diagnosis and fix
The DT-generation Ram 1500 uses a belt-driven electric power steering (EPS) system with the assist motor and control module integrated into the rack-and-pinion. When the EPS module shorts out or the motor fails, the driver loses power assist — sometimes momentarily at startup, sometimes permanently — and the steering becomes very heavy with an 'EPS' or 'Service Power Steering' warning. Because the motor/module are not serviceable separately, a failure requires replacing the entire rack assembly. Earlier 2015-2016 trucks had a related FCA-identified circuit-board contamination defect in the EPS unit.
Common Symptoms
- Sudden heavy/manual steering with loss of power assist
- EPS or 'Service Power Steering' warning light
- Momentary loss of assist at startup
- Clunk or whine from the steering rack
- Steering wander or dead spot on-center
How to Fix
Confirm with a scan tool (EPS control module fault codes) and check the 48V/12V supply and EPS connector before condemning the rack. The fix for a failed unit is replacement of the complete electric rack-and-pinion assembly and recalibration; owners report total repair bills of roughly $3,000-$4,000, often not covered once the basic/powertrain warranty expires. Keep the steering software flashed to the latest level, as some startup-only assist dropouts are resolved by an EPS software update rather than hardware.
Sources for this issue (3)
C1011 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 C1011 mean on a RAM?
C1011 stands for "Left Front Wheel Speed Sensor Signal Erratic Performance." C1011 is a chassis/manufacturer-specific ("C") trouble code most commonly defined (on Chrysler, Dodge, and Jeep) as erratic or out-of-range signal from the left front wheel speed sensor used by the ABS/traction-control system. It sets when the ABS module detects implausible acceleration/deceleration patterns or a faulty signal from that sensor, which can disable ABS, traction control, and stability control. Note that on some other makes (e.g., Mercedes-Benz) the same code number refers instead to an ASR/ETS/ESP hydraulic-unit power-supply circuit fault, so confirm against the specific vehicle. On RAM it is documented across 1 model: 1500.
What are the most common causes of C1011?
The most common causes of C1011 are: Faulty or failing left front wheel speed sensor, Damaged, corroded, or loose sensor wiring/connector (open or short in signal or supply line), Excessive air gap between the sensor and the tone/reluctor ring, Damaged, contaminated, or missing teeth on the tone (reluctor) ring, Worn or loose front wheel bearing/hub causing erratic readings, Defective ABS/traction-control control module. The specific cause varies by vehicle.
How much does it cost to fix C1011 on a RAM?
Published repair estimates on RAM range from $1,800 to $4,000 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.