C1A00 on Ford
Stability Control System Fault
C1A00 on Ford vehicles indicates stability control system fault. Au7o has documented this code across 1 Ford model — most commonly on Focus. This is a chassis/stability-control code that signals a general fault within the electronic stability control system — the network of sensors and the controller that keep the vehicle from skidding or losing traction during hard cornering or slippery conditions. C1A00 typically means the stability control module detected an internal fault or a problem somewhere in the system it can't fully resolve, so it may disable stability and traction control and turn on the related warning lights. Importantly, C1A00 is a manufacturer-specific code and its precise meaning varies by brand, and the full code often includes additional sub-numbers needed to pinpoint the exact fault. Because it's broad, an accurate diagnosis usually requires a capable scan tool to read the extended code and any companion codes. Typical repair costs on Ford range from $900 to $2,500, depending on the specific model and root cause.
Common Causes of C1A00
- •Internal stability control module fault
- •Companion sensor faults (wheel speed, steering angle, yaw/lateral) triggering the system
- •Wiring, connector or ground problems in the stability control circuit
- •Low system or battery voltage / charging issue
- •Module software, calibration or configuration fault
- •Damaged or unplugged sensor harness after service
- •Faulty ABS/stability hydraulic control unit (less common)
C1A00 on Ford by Model
Ford Focus(1 issue)
- Electric Power Assist Steering (EPAS) Rack/Motor-Sensor Failure - "Power Steering Assist Fault" Message2012-2016
The 2012 Mk3 Focus was the first Focus with a fully electric rack-mounted power steering assist (EPAS). The torque/position sensor and motor assembly inside the rack, and the power steering control module (PSCM) integrated with it, fail intermittently - often heat-soaked on long drives or hot days. The dash shows "Power Steering Assist Fault - Service Now", the wheel goes heavy with no warning, and steering no longer self-centers. Failures are frequently intermittent at first (assist returns after a key cycle) and then become permanent. Because the assist motor is integral to the rack, Ford's repair is a complete steering gear replacement. Unlike the Fusion/Taurus/Flex family, which got NHTSA recall 15V340 for the same motor-sensor defect, the Focus was never recalled despite hundreds of NHTSA complaints, and was instead the subject of a class-action suit covering 2012-2014 Focus and Focus Electric.
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View C1A00 across all makes →Frequently Asked Questions
What does C1A00 mean on Ford?▼
C1A00 stands for "Stability Control System Fault." This is a chassis/stability-control code that signals a general fault within the electronic stability control system — the network of sensors and the controller that keep the vehicle from skidding or losing traction during hard cornering or slippery conditions. C1A00 typically means the stability control module detected an internal fault or a problem somewhere in the system it can't fully resolve, so it may disable stability and traction control and turn on the related warning lights. Importantly, C1A00 is a manufacturer-specific code and its precise meaning varies by brand, and the full code often includes additional sub-numbers needed to pinpoint the exact fault. Because it's broad, an accurate diagnosis usually requires a capable scan tool to read the extended code and any companion codes. On Ford specifically, this code is documented across 1 model.
What causes C1A00 on Ford vehicles?▼
Common causes on Ford: Internal stability control module fault, Companion sensor faults (wheel speed, steering angle, yaw/lateral) triggering the system, Wiring, connector or ground problems in the stability control circuit, Low system or battery voltage / charging issue, Module software, calibration or configuration fault. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix C1A00 on a Ford?▼
Repair costs on Ford range from $900 to $2,500, depending on the specific model and root cause.
Which Ford models have C1A00 documented?▼
Au7o has documented C1A00 on 1 Ford model: Focus.