Code
C0283
HUMMER
C — Chassis
Right Rear Wheel Speed Sensor Circuit - Range/Performance
AI status
Completed
Completed
100%
Causes
- Open, shorted or corroded wiring or connector at the right rear wheel speed sensor
- Failed or contaminated wheel speed sensor (sensor element damaged)
- Damaged or missing tone ring/reluctor (chipped, cracked, excessive rust or debris)
- Poor ground or supply voltage to ABS/ESC module or sensor (loss of reference or return)
- Intermittent connector contact from water/contamination or physical damage
- Faulty ABS/ESC control module or internal amplifier/processor failure
Symptoms
- ABS warning lamp illuminated; possible traction/stability control lamp
- Intermittent or constant loss of ABS/traction control functionality
- ABS engages unexpectedly or fails to engage under braking
- Cruise control may be disabled
- Speedometer may behave erratically on some vehicles (depends on system)
- Diagnostic trouble code C0283 stored in ABS/ESC module
What to check
- Read stored codes and freeze frame data with a capable scan tool; note related codes
- Visually inspect right rear wheel area: sensor, connector, harness, tone ring/reluctor
- Check for physical damage, corrosion, missing reluctor teeth, heavy rust or debris
- Wiggle the harness and connector while monitoring live wheel speed data for dropouts
- Measure sensor resistance/continuity per service manual or compare to known-good sensor
- For active sensors check reference supply (typically 5 V or vehicle-specific) and signal with a multimeter or lab scope
Signal parameters
- Active (Hall/VR with electronics) sensor: reference voltage present (often ~5 V) and switching signal that varies 0–5 V (or 0.5–4.5 V) with wheel rotation; frequency increases with speed
- Passive (variable reluctance) sensor: no reference voltage; produces AC voltage and frequency proportional to wheel speed (amplitude increases with speed)
- At rest: near 0 V (passive) or steady reference voltage (active) — no pulses
- With wheel rotation: clean, regular pulse train or sinusoidal AC waveform; irregular amplitude, missing pulses or noise indicates problem
- Exact resistance, voltage and waveform specifications vary by model — consult the vehicle service manual for exact values
Diagnostic algorithm
- Connect a scan tool, record C0283 and any other ABS/vehicle speed codes. Note freeze frame and clear codes.
- With ignition on, inspect the right rear sensor connector for corrosion, bent pins or water intrusion. Disconnect and inspect pins/terminals.
- Visually inspect the tone ring/relictor on the hub/axle for missing teeth, heavy rust, or debris. Clean or repair as needed.
- Backprobe the sensor connector: check for reference voltage and ground (active sensor) or measure resistance between sensor terminals (passive). Compare to service manual or adjacent wheel sensor.
- If passive, spin the wheel (jack up vehicle and rotate wheel) and measure AC voltage/frequency with a multimeter capable of AC measurement or, preferably, an oscilloscope. Look for a clean waveform whose amplitude/frequency increases with speed.
- Wiggle the harness and connector while watching live data for intermittent signal loss. Repair any broken wires or pins.
- If wiring tests are inconclusive, unplug the sensor and check for short to ground or battery with an ohmmeter. Repair shorts or opens in harness, replace damaged connector or pins.
- If the sensor signal is absent or out of specification and wiring is good, replace the right rear wheel speed sensor and retest.
- If new sensor still faults and wiring is verified good, check ABS module power, ground and input circuits. Consider module fault and consult module diagnostic procedures.
- After repair, clear codes, perform a road test and confirm stable, matching wheel speed readings under various speeds. Verify ABS/traction lamps remain off.
Likely causes
- Wiring connector corrosion or broken/abraded wires at the sensor harness (most common)
- Failed wheel speed sensor from contamination, impact or age
- Debris/damaged reluctor ring causing inconsistent signal
- Intermittent connection from a loose harness retention or pin
Fault status
Status
Right Rear Wheel Speed Sensor Circuit — Range/Performance fault detected. ABS/ESC has stored C0283 and may disable associated stability/traction functions until fault is resolved.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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