Code
C0620
HUMMER
C — Chassis
Right Front Position Sensor Malfunction
Views:
UK: 15
EN: 17
RU: 20
AI status
Completed
Completed
100%
Causes
- Corroded, loose or disconnected connector at the right front position sensor
- Damaged wiring harness (short to power/ground or open circuit) to the sensor
- Failed right front position sensor
- Mechanical binding, seized linkage or misalignment of the position sensor
- Water intrusion or contamination at sensor or connector
- Blown fuse or poor ground affecting the sensor supply
Symptoms
- Chassis/suspension warning light or general malfunction indicator illuminated
- Vehicle ride height incorrect at right front (sagging, high or uneven stance)
- Suspension leveling or auto-ride-height function inoperative or behaving erratically
- Possible diagnostic trouble codes stored and intermittent system operation
- Vehicle leaning or uneven handling at low speed
What to check
- Read all stored chassis and suspension codes with a capable scan tool; record freeze-frame and occurrence counts
- Inspect right front sensor and connector for corrosion, bent pins, damaged locking tab or water ingress
- Visually inspect wiring harness along routing for chafing, pinches, or repairs
- Check fuses and known ground points for the suspension/control module
- Attempt to reproduce fault while observing live data for the right front sensor
- Perform a wiggle test on harness and connector while watching live sensor data for dropouts or erratic values
Signal parameters
- Reference supply voltage to sensor (typically 5 V — confirm factory spec)
- Sensor signal voltage at rest and while moving linkage (typical range ~0.5–4.5 V for many position sensors; consult OEM spec)
- Signal continuity and resistance of sensor (check per service manual)
- Signal frequency if the sensor is frequency-output type
- Ground circuit continuity to chassis/ECM ground
- Live data position value (percent/mm) and whether it changes smoothly when suspension is moved
Diagnostic algorithm
- Connect a factory-level or equivalent scan tool; confirm C0620 and any related codes and note freeze frame data
- Perform visual inspection of the right front sensor, linkage and connector for damage, contamination, water intrusion or loose mounting
- With ignition on, back-probe the sensor connector: verify presence of reference voltage, proper ground, and sensor signal while moving the suspension linkage by hand. Compare readings to factory ranges
- If reference voltage or ground is missing, trace and repair wiring, fuses, or grounds to the control module
- If reference and ground are present but signal is fixed, intermittent, or out of range, inspect wiring for opens/shorts and perform continuity/resistance checks to the control module
- Perform a wiggle test of the harness and connector while monitoring live data to detect intermittent faults
- If wiring checks good, swap the right front sensor with a known-good identical corner sensor (if available) to see if the code follows the sensor — this isolates sensor vs module/wiring
- If sensor replacement is required, use OEM replacement and follow any required sensor calibration/initialization procedure using a scan tool
- After repair or replacement, clear codes and verify proper operation and that code does not return; road test and re-check live values
Likely causes
- Damaged/contaminated connector or wiring to the right front sensor
- Failed position sensor element
- Physical damage or binding of sensor linkage
- Corrosion or moisture in harness connector
Fault status
Status
Right Front Position Sensor circuit malfunction detected — signal absent, out of range, or intermittent.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
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