Code
C1145
LAND ROVER
C — Chassis
Failure in the input circuit of the right front wheel speed sensor
Views:
UK: 11
EN: 141
RU: 54
AI status
Completed
Completed
100%
Causes
- Damaged or contaminated right front wheel speed sensor
- Broken, shorted, or corroded wiring or connector between sensor and ABS module
- Loose or corroded connector pins / poor grounding
- Damaged or missing tone ring / reluctor on the hub/drive flange
- Faulty ABS/ESC control module (less common)
- Wheel bearing damage affecting sensor air gap or tone ring
Symptoms
- ABS / traction control warning lamp illuminated
- Possible stability control warning and reduced ESC/traction functionality
- ABS operation disabled or degraded (noticeable during braking)
- Intermittent or constant fault on scan tool for right front wheel speed
- Unusual wheel bearing noise if bearing-related
What to check
- Read stored and pending codes and capture freeze-frame / live wheel speed data with a scan tool
- Visually inspect right front sensor, tone ring, wiring, and connector for damage, corrosion, or contamination
- Wiggle the harness and connector while watching live wheel speed data for intermittent changes
- Backprobe the connector to check sensor resistance and/or supply (if active sensor) with a multimeter
- Measure AC output or pulse signal while rotating the wheel (hand spin or road test) using a multimeter or oscilloscope
- Check continuity and short-to-ground/power between sensor connector and ABS module pins
Signal parameters
- Passive (VR) sensor: DC resistance typically in the hundreds to low thousands of ohms (manufacturer-specific); produces an AC voltage that rises with wheel speed and is sine-like
- Active (Hall/MPU) sensor: supplies a 5 V or 12 V reference, ground and outputs a square/pulse signal from 0–5 V (or 0–12 V depending on system)
- Expected behavior: no signal at rest, increasing AC amplitude or pulse frequency proportional to wheel speed; clean, repeatable waveform on oscilloscope
- Common faults: open circuit (infinite resistance), short to ground/power, very low or noisy output, missing pulses
Diagnostic algorithm
- Connect a diagnostic scan tool, record C1145 details, and view live wheel speed data for all four wheels.
- Clear the code and perform a short road test to verify fault returns and observe live data behavior for the right front wheel.
- Visually inspect the right front wheel sensor, connector, harness routing, and tone ring for damage, contamination, loose clips, or corrosion.
- With ignition off, disconnect the sensor connector and inspect pins for corrosion, bent pins, or water ingress; repair or replace connector as needed.
- Measure sensor resistance (if passive) across the sensor terminals; compare to manufacturer spec. An open or out-of-spec reading indicates a bad sensor.
- Reconnect and backprobe the connector. With wheel rotated (or vehicle lifted and wheel spun), measure AC voltage (passive) or pulse output (active) with a multimeter or oscilloscope. Verify waveform and amplitude increase with speed.
- Perform continuity check from sensor connector to ABS module pin to detect opens or shorts. Also check for short to ground or battery.
- If signal is missing but wiring is good, verify reference supply and ground at the sensor (for active sensors). Replace sensor if no valid output.
- If waveform is noisy or intermittent when harness is wiggled, repair wiring harness and secure routing away from sharp edges and heat sources.
- Inspect tone ring/reluctor for missing/broken teeth, heavy rust, or contamination; replace or clean as required.
- After repairs or sensor replacement, clear codes and road test to confirm correct operation and that the code does not return.
- If wiring and sensor check good but code persists, consider ABS/ESC module input fault and refer to manufacturer module diagnostics.
Likely causes
- Corroded connector or pin(s) at the sensor
- Open or short in the sensor harness (wire chafing or connector separation)
- Failed wheel speed sensor (internally shorted or open)
- Damaged tone ring (cracked, missing teeth, heavy rust)
- Contaminated sensor face (metal debris, grease) preventing proper signal
Fault status
Status
C1145 — Right front wheel speed sensor input circuit: signal missing, intermittent or invalid; ABS/ESC module has flagged the RF wheel speed input.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
C1145
Other
C — Chassis
Speed Wheel Sensor RF Input Circuit Failure
Views:
UK: 30
EN: 214
RU: 142
AI status
Completed
Completed
100%
Causes
- Damaged or contaminated right front wheel speed sensor
- Broken, shorted, or corroded wiring or connector between sensor and ABS module
- Loose or corroded connector pins / poor grounding
- Damaged or missing tone ring / reluctor on the hub/drive flange
- Faulty ABS/ESC control module (less common)
- Wheel bearing damage affecting sensor air gap or tone ring
Symptoms
- ABS / traction control warning lamp illuminated
- Possible stability control warning and reduced ESC/traction functionality
- ABS operation disabled or degraded (noticeable during braking)
- Intermittent or constant fault on scan tool for right front wheel speed
- Unusual wheel bearing noise if bearing-related
What to check
- Read stored and pending codes and capture freeze-frame / live wheel speed data with a scan tool
- Visually inspect right front sensor, tone ring, wiring, and connector for damage, corrosion, or contamination
- Wiggle the harness and connector while watching live wheel speed data for intermittent changes
- Backprobe the connector to check sensor resistance and/or supply (if active sensor) with a multimeter
- Measure AC output or pulse signal while rotating the wheel (hand spin or road test) using a multimeter or oscilloscope
- Check continuity and short-to-ground/power between sensor connector and ABS module pins
Signal parameters
- Passive (VR) sensor: DC resistance typically in the hundreds to low thousands of ohms (manufacturer-specific); produces an AC voltage that rises with wheel speed and is sine-like
- Active (Hall/MPU) sensor: supplies a 5 V or 12 V reference, ground and outputs a square/pulse signal from 0–5 V (or 0–12 V depending on system)
- Expected behavior: no signal at rest, increasing AC amplitude or pulse frequency proportional to wheel speed; clean, repeatable waveform on oscilloscope
- Common faults: open circuit (infinite resistance), short to ground/power, very low or noisy output, missing pulses
Diagnostic algorithm
- Connect a diagnostic scan tool, record C1145 details, and view live wheel speed data for all four wheels.
- Clear the code and perform a short road test to verify fault returns and observe live data behavior for the right front wheel.
- Visually inspect the right front wheel sensor, connector, harness routing, and tone ring for damage, contamination, loose clips, or corrosion.
- With ignition off, disconnect the sensor connector and inspect pins for corrosion, bent pins, or water ingress; repair or replace connector as needed.
- Measure sensor resistance (if passive) across the sensor terminals; compare to manufacturer spec. An open or out-of-spec reading indicates a bad sensor.
- Reconnect and backprobe the connector. With wheel rotated (or vehicle lifted and wheel spun), measure AC voltage (passive) or pulse output (active) with a multimeter or oscilloscope. Verify waveform and amplitude increase with speed.
- Perform continuity check from sensor connector to ABS module pin to detect opens or shorts. Also check for short to ground or battery.
- If signal is missing but wiring is good, verify reference supply and ground at the sensor (for active sensors). Replace sensor if no valid output.
- If waveform is noisy or intermittent when harness is wiggled, repair wiring harness and secure routing away from sharp edges and heat sources.
- Inspect tone ring/reluctor for missing/broken teeth, heavy rust, or contamination; replace or clean as required.
- After repairs or sensor replacement, clear codes and road test to confirm correct operation and that the code does not return.
- If wiring and sensor check good but code persists, consider ABS/ESC module input fault and refer to manufacturer module diagnostics.
Likely causes
- Corroded connector or pin(s) at the sensor
- Open or short in the sensor harness (wire chafing or connector separation)
- Failed wheel speed sensor (internally shorted or open)
- Damaged tone ring (cracked, missing teeth, heavy rust)
- Contaminated sensor face (metal debris, grease) preventing proper signal
Fault status
Status
C1145 — Right front wheel speed sensor input circuit: signal missing, intermittent or invalid; ABS/ESC module has flagged the RF wheel speed input.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
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