OBD-II code family
Wheel, Brake and Steering Signal Codes (Application Dependent) (8 codes)
8 related fault descriptions. Use each full code and the exact vehicle service information to identify its circuit, monitored condition, and required tests.
Codes in this family
This is the complete published member list for this guide. Each code retains its own page; shared diagnostic context does not mean that every member has the same test or repair.
- C0035Left Front Wheel Speed Sensor Circuit
- C0036Left Rear Tone-Wheel Signal Fault (Application Dependent)
- C0040Right Front Wheel Speed Sensor Circuit
- C0041Brake Switch Signal Fault (Application Dependent)
- C0045Left Rear Wheel Speed Sensor Circuit
- C0046Left Front ABS Dump-Valve Circuit Open (GM Example)
- C0050Right Rear Wheel Speed Sensor Circuit
- C0051Steering Wheel Position Signal Fault (Application Dependent)
What these codes mean
These eight chassis codes require vehicle-specific identification. On the listed GM applications, C0035/C0040/C0045/C0050 describe left-front/right-front/left-rear/right-rear wheel-speed inputs. The adjacent numbers cannot be interpreted as four universal range/performance versions of those same sensors.
Concrete manufacturer examples show the differences. FCA’s MY2015 DS note identifies C0036-02 as a left-rear tone-wheel signal fault. Honda’s 2019–2020 Civic Bosch-ADAS example identifies C0041-14 as a brake-switch signal issue. The archived 1997 GM example identifies C0046 as left-front ABS dump-solenoid circuit open. GM and FCA examples identify C0051 conditions involving steering-wheel position. Check the complete code, suffix, reporting module and vehicle before choosing a hub, brake switch, steering sensor or modulator repair.
For an actual wheel-speed fault, identify active or passive technology from service information. Wire count and a missing feed are not enough. Use permitted waveform/current checks, not a resistance test on an active sensor. Compare readings under matched motion; turning one wheel while the others stay still naturally gives different readings. A missing wheel signal does not distinguish the sensor from its supply, wiring, target, mounting or bearing.
Brake-switch input, steering-position feedback and an internal ABS valve need their own diagrams and procedures. Wheel-sensor swaps, hub replacement and encoder cleaning are not generic tests for every member of this guide. Apply a bulletin only within its model, equipment and symptom-code scope. Any required programming or calibration follows the demonstrated repair.
Record actual braking and steering symptoms and warning messages. Stop safely for a red brake warning, fluid leakage, abnormal pedal, pulling, reduced braking or unsafe steering assistance. Neither the code nor an apparently normal wheel-speed reading guarantees that hydraulic or mechanical braking is sound.
Identify the circuit on your vehicle
Match the full DTC, reporting module, and any failure-type suffix to the service information for your exact year, make, model, engine, and equipment. An identifier alone does not establish installed hardware count, location, connector pinout, or a universal measurement.
Where the manufacturer publishes its own meaning for this code, that is the one to work from — it describes the actual component on your vehicle, which the generic definition cannot. Keep the generic description for what it is good for: it tells you which subject area the standard assigned the code to, which is useful context when the two appear to disagree. If they do disagree, follow the manufacturer.