Code
C0625
HUMMER
C — Chassis
Left Rear Position Sensor Malfunction
Views:
UK: 12
EN: 21
RU: 12
AI status
Completed
Completed
100%
Causes
- Open or short in the left rear position sensor wiring or connector
- Corroded or loose connector at the sensor
- Failed left rear position (height/position) sensor
- Contaminated or mechanically damaged sensor (impact, water intrusion)
- Faulty suspension/ride-height actuator or related mechanical linkage
- Faulty control module or poor module communication
Symptoms
- Suspension/ride-height warning lamp or chassis control warning lamp illuminated
- Vehicle sagging or incorrect ride height at the left rear corner
- Limited suspension function, degraded ride control, or limp-home mode
- Diagnostic trouble code C0625 stored in ABS/air suspension/controller
- Intermittent or permanently abnormal ride behavior on that corner
What to check
- Scan vehicle with a capable scan tool, read freeze frame and live data for left rear position sensor
- Visually inspect left rear sensor, connector, harness routing and mounting bracket for damage or corrosion
- Check related fuses and ground points for integrity and corrosion
- Wiggle harness and connector while watching live data to find intermittent wiring faults
- Compare left rear sensor values to other corners if system provides multiple sensor readings
- Review technical service bulletins (TSBs) for known HUMMER/GM issues with rear position sensors
Signal parameters
- Reference voltage (if active sensor): typically 5 V reference present at connector with ignition ON
- Potentiometer-style position sensor: signal should vary between ~0–5 V as suspension/position changes
- Hall-effect or digital position sensor: switching or variable voltage between ~0.5–4.5 V, depending on design
- Passive (reluctor) sensors (if used): produce AC voltage proportional to movement; low/zero at rest
- Resistance check (if applicable): an open (infinite) or short (near 0 Ω) indicates a fault — consult OEM spec for exact resistance range
Diagnostic algorithm
- Retrieve all codes and note freeze-frame data. Check for related codes (other corners or communication faults).
- Perform a visual inspection of the left rear sensor, connector, and harness. Look for corrosion, pin damage, broken clips, or rubbing.
- With connector disconnected, inspect pins for corrosion/bent pins and ensure good mating. Clean and reseal if necessary.
- Backprobe the sensor connector with ignition ON and measure reference voltage and signal while moving the suspension or turning the wheel (as applicable). Compare to expected signal behavior.
- If sensor is passive, measure AC output while rotating wheel or operating suspension; if active, check DC signal change with movement.
- Perform a continuity/short-to-power/short-to-ground check between the sensor connector and the control module harness connector. Repair any wiring faults.
- Wiggle test the harness and connector while observing live data to detect intermittent faults caused by movement/vibration.
- If wiring, connector, and grounds are good but sensor signal out of spec, replace the left rear position sensor and retest.
- After repair, clear codes and perform a road or suspension/height cycle to confirm the fault does not return and sensor readings are within expected range.
- If problem persists after sensor replacement, test/replace the control module or investigate for intermittent module communication faults per manufacturer procedures.
Likely causes
- Damaged harness or connector (chafing, pin corrosion, rodent damage)
- Sensor stopped producing expected voltage/resistance or AC signal
- Water ingress or corrosion at the sensor connector
- Sensor bracket shifted or sensor misaligned from target
- Intermittent open circuit or short to battery/ground due to vibration
Fault status
Status
Left rear position sensor circuit is reporting an abnormal or missing signal to the control module. Inspect sensor, connector, wiring, and related grounds; repair or replace components as required.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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