Code
C1762
HUMMER
C — Chassis
Left Rear Position Sensor Input Fault
AI status
Completed
Completed
100%
Causes
- Damaged or disconnected left rear position sensor
- Broken, rubbed-through or corroded wiring harness or connector
- Water intrusion or corrosion at the sensor connector
- Sensor mechanical binding or seized linkage (suspension pivot)
- Poor ground or lost reference/supply voltage to the sensor
- Faulty control module or internal module input fault
Symptoms
- ABS, VDC or suspension warning lamp illuminated
- Service message for suspension/ride height/leveling
- Uneven ride height or visible sag at left rear corner
- Suspension compressor running more often or not at all (if air-suspension)
- Reduced vehicle stability control or altered ride quality
- Diagnostic trouble code C1762 stored in module memory
What to check
- Read and record all stored codes and freeze-frame data with a scan tool
- Visually inspect left rear sensor, linkage and mounting for damage, corrosion or binding
- Inspect wiring harness and connector for chafing, breaks, corrosion and proper seating
- Check vehicle battery voltage and charging system health
- Monitor live data for left rear position sensor while moving suspension or operating vehicle
- Perform wiggle test on harness and connector while watching live data for intermittent changes
Signal parameters
- Typical position sensor reference: 5 V (check service manual for exact value)
- Typical signal output: varies with travel, commonly 0.5–4.5 V (analog potentiometer style) or digital encoder pulses
- Expected ground: near 0 V
- Open-circuit/short-to-ground: diagnostic tool may show no change or frozen value
- Resistance (if applicable): service manual specified ohms — often in kilo-ohm range for potentiometer sensors
Diagnostic algorithm
- Connect a capable scan tool, read and record C1762 and any other related codes; note freeze-frame data and live sensor values.
- Visually inspect the left rear sensor, linkage and connector for physical damage, loose mounting or contamination. Repair/clean as needed.
- With ignition ON (engine off unless specified), back-probe the sensor connector. Verify reference voltage (usually ~5 V) and ground presence per service manual.
- Observe the sensor signal while moving the suspension by hand (or operating a lift) and watch live data: the signal should change smoothly with travel. If no change or erratic values, suspect sensor or wiring.
- Perform continuity and resistance checks on the harness from sensor connector to the control module to find opens/shorts, especially through any flex points near the suspension.
- Check for short to battery or ground. Repair any damaged wiring or connector terminals and secure harness away from pinch points.
- If wiring and connectors are good, replace the left rear position sensor. Use OEM replacement and install per torque and alignment specs.
- After repair or replacement, clear codes and perform any required sensor relearn/calibration procedure with a scan tool or follow service manual steps.
- Test drive and re-scan to ensure C1762 does not return and system operates normally.
- If fault persists after sensor and wiring verified, consider control module input circuit testing or module replacement per manufacturer procedures.
Likely causes
- Open or short in the sensor signal/return wiring at suspension travel point
- Corroded/dirty connector causing intermittent signal
- Failed left rear position sensor (internal electronics or pot/encoder wear)
- Sensor linkage detached, bent, or binding preventing proper movement
- Low battery/poor system voltage causing incorrect sensor reading
Fault status
Status
Left Rear Position Sensor Input Fault — control module detects invalid or no signal from the left rear suspension/position sensor. May illuminate suspension/ABS/VDC warning and disable or limit related functions until fault is addressed.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
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Repair manuals
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138
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