C1235 on Toyota: How to Diagnose & Fix
Manufacturer-Specific Chassis/ABS Wheel-Speed Sensor Circuit Code
1 Toyota model · 1 documented issue · $20-$700 repair
C1235 on Toyota by model: symptoms, diagnosis and fix
A very common Yaris electrical fault: the rear wheel speed sensor is integrated into the rear hub/bearing assembly and is not sold separately. The weather seal where the harness plugs into the hub has a gap, so road spray and winter salt wick into the connector, corrode the pins and degrade the signal. The ABS light and the red brake/'!' light come on together, often intermittently at first and worse in wet or winter weather. Dealers routinely quote a complete rear hub assembly (owners report $650-750 CAD per side) when the actual fault is frequently just a dirty, corroded connector.
Common Symptoms
- ABS light and red brake/'!' light on together
- Lights come on intermittently, worse in rain, snow or after driving on salted roads
- ABS unavailable, traction/stability warning
- Speed sensor circuit code stored for one rear wheel
How to Fix
Before buying a hub: unplug the rear speed sensor connector at the hub, clean the corrosion out of both halves with electrical contact cleaner, inspect the pins, repack with dielectric grease and seal the harness gap so spray can't re-enter. Check the harness routing for chafe points along the trailing arm too. If the pins are already eaten away or the sensor reads open/erratic on a scan tool, the rear hub/bearing assembly must be replaced as a unit - the sensor is not serviceable separately.
Sources for this issue (3)
C1235 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 C1235 mean on a Toyota?
C1235 stands for "Manufacturer-Specific Chassis/ABS Wheel-Speed Sensor Circuit Code." C1235 is a manufacturer-specific chassis/ABS code most commonly associated with a wheel-speed sensor circuit (for example, a rear wheel speed circuit reported as open or shorted on some makes). It indicates the ABS/stability control module detected an electrical fault or implausible signal in a wheel-speed input it monitors. When set, ABS and traction/stability control are usually disabled and the related warning lights illuminate, though normal braking remains. Confirm which wheel and circuit are involved for your specific make and model using a capable scan tool or factory service data. On Toyota it is documented across 1 model: Yaris.
What are the most common causes of C1235?
The most common causes of C1235 are: Faulty wheel speed sensor, Damaged tone/reluctor ring (chipped or rusty teeth), Open or shorted sensor wiring, Connector corrosion or damage, Excessive sensor air gap or debris buildup, ABS/stability control module fault. The specific cause varies by vehicle.
How much does it cost to fix C1235 on a Toyota?
Published repair estimates on Toyota range from $20 to $700 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.
Looking for C1235 on a different make?
View C1235 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.