C1146

Code

Other C — Chassis

Speed Wheel Sensor RF Circuit Open

Brand: Other

Type: C — Chassis

Views: UK: 19 EN: 52 RU: 37

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Page language: EN

ABS warning lamp illuminated
Traction control/ESC warning lamp may illuminate and system disabled
Possible intermittent ABS operation or inability to engage ABS/traction control
Noisy or damaged bearing in same area (if tone ring/hub is damaged)
Vehicle may show reduced braking stability under hard braking (ABS not functional)

Check service history / freeze frame and confirm C1146 is current or stored
Visual inspection of RF wheel area: sensor, wiring, connector, tone ring and hub
Check connector for corrosion, bent pins, water ingress or mechanical damage
Wiggle/operate the harness and connector while monitoring ABS diagnostics or scan tool for changes
Measure sensor resistance (for passive sensors) or check supply/reference voltage (for active/Hall sensors) at the sensor connector
Perform continuity check from sensor connector back to ABS module pins to confirm open circuit

Passive (magnetic/VR) sensor: typical resistance ~800–2000 Ω (varies by vehicle). AC output increases with wheel speed; expect measurable AC voltage (tens to hundreds mV at low speed, rising with RPM)
Active (Hall/HTL) sensor: requires 5 V reference and ground from module; output is square wave 0–5 V (or 0.5–4.5 V) with frequency proportional to wheel speed
Typical air gap: 0.5–3.0 mm (vehicle-specific) — consult manufacturer spec
On bench or at wheel: verify continuity to module (0 Ω open = infinite), and expected supply voltage present for active sensors

Retrieve freeze frame data and any additional ABS/wheel sensor codes; note whether code is current or intermittent.
Visually inspect RF wheel speed sensor, wiring, and connector. Look for chafing, crushed wiring, corrosion, or connector separation. Repair visible damage.
Unplug RF sensor connector, inspect pins for corrosion or damage, clean and re-seat. Measure for reference supply (5 V) and ground (for active sensors).
For passive sensors: measure resistance across sensor terminals. If resistance is open/infinite, replace sensor. For active sensors: verify reference voltage and ground; if absent, trace back to ABS module.
Perform continuity check from sensor pins to the ABS module connector to confirm open circuit location. Back-probe module connector if needed.
Check sensor air gap and tone ring condition; repair or replace hub/tone ring if damaged or gap out of spec.
If wiring repairs are made, protect and route harness away from moving parts; replace sensor or hub assembly as necessary.
Clear codes, perform road test and verify that code does not return and ABS/traction operation is restored.

Damaged harness at steering knuckle or near wheel (most common)
Corroded/contaminated sensor connector
Failed RF wheel speed sensor
Physical damage to tone ring or wheel bearing assembly causing sensor to lose reference