Code
C2117
Generic
C — Chassis
ABS wheel speed sensor circuit intermittent — right rear
Views:
UK: 0
EN: 0
RU: 0
AI status
Completed
Completed
100%
Causes
- Damaged or contaminated wheel speed sensor (right rear)
- Broken, chafed or pinched wiring harness near the right‑rear suspension or wheel
- Corroded, loose or water‑intruded connector at the sensor or ABS module
- Missing or damaged tone/ring gear (magnetic reluctor) on the hub or axle
- Faulty wheel bearing allowing variable air gap or electrical noise
- Poor ground or reference voltage to the sensor
Symptoms
- ABS warning lamp ON (intermittent)
- Traction control/stability control warning or unexpected interventions
- Erratic or fluctuating wheel speed reading for right‑rear on scan tool live data
- ABS pump or valves activate unexpectedly
- Cruise control or speed‑dependent systems may behave erratically
- No drivability engine faults typically, but safety systems affected
What to check
- Retrieve freeze‑frame and stored codes with a scan tool; note conditions when fault sets
- Monitor live wheel speed sensor data (all four wheels) at rest and during low/high speed drive to reproduce the intermittent event
- Visually inspect right‑rear wiring, connector and sensor for damage, corrosion, contamination or loose mounting
- Inspect tone ring/reluctor on hub/axle for missing teeth, cracks, heavy rust or metal debris
- Wiggle the harness and connector while watching live data (do this safely with vehicle supported and wheels chocked) to try to reproduce the intermittent fault
- Check for other related DTCs (ABS, BCM, transmission speed codes) that may indicate wiring or module issues
Signal parameters
- Passive (variable reluctor) sensor: DC resistance typically in the 800–3,000 Ω range (varies by design); AC voltage output increases with wheel speed — measurable AC volts at low speed (e.g., 0.2–1.0 Vrms) rising to several Vrms at higher speeds
- Active (Hall/VR with electronics) sensor: Square‑wave or pulse output typically near 0–5 V (or 0–12 V on some systems); frequency increases with wheel speed
- Signal frequency proportional to wheel speed; amplitude and duty cycle should be stable and consistent with other wheels at same speed
- Reference and ground (active sensors): stable 5 V (or manufacturer spec) reference and solid ground required — voltage should not collapse when spinning the wheel
Diagnostic algorithm
- Step 1 — Read codes and live data: connect a scan tool, record freeze frame and monitor all wheel speeds while sitting, during slow roll and normal road speed to spot dropouts or noise.
- Step 2 — Visual inspection: safely lift and support vehicle, remove wheel if needed, inspect sensor, connector and tone ring for damage, contamination or missing teeth.
- Step 3 — Wiggle/replicate: with scan tool showing real‑time speed, carefully move harness/connector and rotate wheel to reproduce intermittent behavior (use jack stands, wheel chocks).
- Step 4 — Basic electrical checks: unplug sensor and inspect terminals; check for corrosion and proper terminal fit. For passive sensors measure DC resistance and compare to spec; for active sensors check reference voltage and ground with ignition on.
- Step 5 — Signal verification: spin the wheel and measure AC output of a passive sensor with a multimeter set to AC or use an oscilloscope for active sensors — look for clean, consistent pulses matching other wheels.
- Step 6 — Continuity and shorts: perform continuity checks from sensor connector back to ABS module connector and check for short to ground or battery. Repair any damaged wiring or connectors.
- Step 7 — Mechanical checks: inspect hub/bearing play and tone ring alignment; replace damaged tone ring or bearing as needed.
- Step 8 — Repair and verify: repair or replace the sensor, connector or wiring as indicated, clear codes and perform a road test to confirm fault does not reappear. If intermittent persists, scope the module input and consider ABS module/connector inspection or replacement per manufacturer guidance.
Likely causes
- Wiring harness damage at suspension pivot or wheel area causing intermittent connection
- Corroded/loose sensor connector allowing intermittent contact when wheel moves
- Contaminated or damaged sensor tip or reluctor ring creating erratic pulses
Fault status
Status
Intermittent right‑rear wheel speed sensor circuit fault detected — irregular or missing speed signal from right‑rear wheel input to ABS/traction control module.
Repair difficulty: Medium
Diagnostic time: 0.5–2.5 hours
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Code
C2117
HYUNDAI
C — Chassis
Main Pump Relay Abnormal
Views:
UK: 10
EN: 16
RU: 10
AI status
Completed
Completed
100%
Causes
- Damaged or contaminated wheel speed sensor (right rear)
- Broken, chafed or pinched wiring harness near the right‑rear suspension or wheel
- Corroded, loose or water‑intruded connector at the sensor or ABS module
- Missing or damaged tone/ring gear (magnetic reluctor) on the hub or axle
- Faulty wheel bearing allowing variable air gap or electrical noise
- Poor ground or reference voltage to the sensor
Symptoms
- ABS warning lamp ON (intermittent)
- Traction control/stability control warning or unexpected interventions
- Erratic or fluctuating wheel speed reading for right‑rear on scan tool live data
- ABS pump or valves activate unexpectedly
- Cruise control or speed‑dependent systems may behave erratically
- No drivability engine faults typically, but safety systems affected
What to check
- Retrieve freeze‑frame and stored codes with a scan tool; note conditions when fault sets
- Monitor live wheel speed sensor data (all four wheels) at rest and during low/high speed drive to reproduce the intermittent event
- Visually inspect right‑rear wiring, connector and sensor for damage, corrosion, contamination or loose mounting
- Inspect tone ring/reluctor on hub/axle for missing teeth, cracks, heavy rust or metal debris
- Wiggle the harness and connector while watching live data (do this safely with vehicle supported and wheels chocked) to try to reproduce the intermittent fault
- Check for other related DTCs (ABS, BCM, transmission speed codes) that may indicate wiring or module issues
Signal parameters
- Passive (variable reluctor) sensor: DC resistance typically in the 800–3,000 Ω range (varies by design); AC voltage output increases with wheel speed — measurable AC volts at low speed (e.g., 0.2–1.0 Vrms) rising to several Vrms at higher speeds
- Active (Hall/VR with electronics) sensor: Square‑wave or pulse output typically near 0–5 V (or 0–12 V on some systems); frequency increases with wheel speed
- Signal frequency proportional to wheel speed; amplitude and duty cycle should be stable and consistent with other wheels at same speed
- Reference and ground (active sensors): stable 5 V (or manufacturer spec) reference and solid ground required — voltage should not collapse when spinning the wheel
Diagnostic algorithm
- Step 1 — Read codes and live data: connect a scan tool, record freeze frame and monitor all wheel speeds while sitting, during slow roll and normal road speed to spot dropouts or noise.
- Step 2 — Visual inspection: safely lift and support vehicle, remove wheel if needed, inspect sensor, connector and tone ring for damage, contamination or missing teeth.
- Step 3 — Wiggle/replicate: with scan tool showing real‑time speed, carefully move harness/connector and rotate wheel to reproduce intermittent behavior (use jack stands, wheel chocks).
- Step 4 — Basic electrical checks: unplug sensor and inspect terminals; check for corrosion and proper terminal fit. For passive sensors measure DC resistance and compare to spec; for active sensors check reference voltage and ground with ignition on.
- Step 5 — Signal verification: spin the wheel and measure AC output of a passive sensor with a multimeter set to AC or use an oscilloscope for active sensors — look for clean, consistent pulses matching other wheels.
- Step 6 — Continuity and shorts: perform continuity checks from sensor connector back to ABS module connector and check for short to ground or battery. Repair any damaged wiring or connectors.
- Step 7 — Mechanical checks: inspect hub/bearing play and tone ring alignment; replace damaged tone ring or bearing as needed.
- Step 8 — Repair and verify: repair or replace the sensor, connector or wiring as indicated, clear codes and perform a road test to confirm fault does not reappear. If intermittent persists, scope the module input and consider ABS module/connector inspection or replacement per manufacturer guidance.
Likely causes
- Wiring harness damage at suspension pivot or wheel area causing intermittent connection
- Corroded/loose sensor connector allowing intermittent contact when wheel moves
- Contaminated or damaged sensor tip or reluctor ring creating erratic pulses
Fault status
Status
Intermittent right‑rear wheel speed sensor circuit fault detected — irregular or missing speed signal from right‑rear wheel input to ABS/traction control module.
Repair difficulty: Medium
Diagnostic time: 0.5–2.5 hours
Similar codes
Your experience will help others
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