Code
C1761
HUMMER
C — Chassis
Right Front Position Sensor Input Fault
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring harness to the right front position sensor
- Corroded, loose or damaged sensor connector/pins
- Failed right front position/height sensor
- Water intrusion or physical damage to sensor
- Poor ground or missing reference voltage to the sensor
- Faulty suspension control module / body control module or software fault
Symptoms
- Suspension/air ride warning lamp or message on instrument cluster
- Uneven ride height or sagging at right front corner
- Vehicle unable to level or adjust ride height
- Stored DTC C1761 and possibly related chassis/suspension DTCs
- Intermittent or constant fault lamp, possible degraded suspension performance
What to check
- Read and record freeze frame and full DTC list with a capable scan tool
- Visually inspect right front sensor, mounting, linkage and connector for damage, contamination or loose fasteners
- Inspect wiring harness along routing for chafes, pinches, or repairs
- Backprobe connector and verify reference voltage (usually ~5 V) and ground at key on
- Measure sensor signal voltage while raising/lowering suspension to confirm smooth change
- Wiggle harness and connector while monitoring live data to look for intermittent changes
Signal parameters
- Sensor type: typically analog position sensor (potentiometer) or Hall-effect position sensor
- Reference voltage (typical): ~5.0 V (verify with service data)
- Signal voltage range (expected): ~0.2–4.8 V depending on travel; mid-position ~2.5 V
- Signal should change smoothly and proportionally with suspension travel (no jumps or dropouts)
- Connector pin resistance to ground: low continuity for ground; verify per service specs
- No CAN parameter response does not necessarily indicate analog failure — verify both analog circuit and module messages
Diagnostic algorithm
- Retrieve all stored codes and freeze frame with a scan tool; note any related chassis or module codes.
- Attempt to operate suspension and observe live data for right front position sensor. Note if the value is fixed, erratic, or out of expected range.
- Visually inspect sensor assembly, mounting, linkage and harness for damage, contamination, water ingress or disconnected connectors.
- With ignition ON (engine off), backprobe the sensor connector and verify reference voltage and ground. Compare against service manual values.
- Measure sensor signal voltage while an assistant moves the suspension or with suspension control commands. Signal should change smoothly across the expected range.
- Perform a wiggle test on harness and connector while watching live data to find intermittent opens/shorts.
- Check continuity and resistance of wiring between sensor connector and the control module; check for short to battery or ground.
- If wiring and power/ground are good but signal is out of spec, replace the right front position sensor. Use OEM or equivalent part.
- If sensor replacement does not clear code or if there is no signal at connector, inspect/repair wiring to the control module and verify module input. Reprogram/replace module only if confirmed faulty per service procedures.
- After repair, clear codes, cycle ignition and perform functional test or road test to confirm the fault does not return.
Likely causes
- Damaged sensor wiring (pinched, chafed, rodent damaged) between sensor and control module
- Corrosion in connector terminals causing intermittent signal or high resistance
- Sensor internal failure (potentiometer, Hall element) causing stuck or erratic voltage
- Connector not fully seated after service or collision repair
- Battery voltage problems or blown fuse feeding the sensor circuit
Fault status
Status
Right front position sensor input is out of range or not present. The suspension control module has detected an invalid or missing signal from the right front height/position sensor.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
Repair manuals
Manual library for HUMMER
138
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Code
C1761
Other
C — Chassis
Air Suspension Rear Height Sensor High (SE) Signal Circuit Open
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring harness to the right front position sensor
- Corroded, loose or damaged sensor connector/pins
- Failed right front position/height sensor
- Water intrusion or physical damage to sensor
- Poor ground or missing reference voltage to the sensor
- Faulty suspension control module / body control module or software fault
Symptoms
- Suspension/air ride warning lamp or message on instrument cluster
- Uneven ride height or sagging at right front corner
- Vehicle unable to level or adjust ride height
- Stored DTC C1761 and possibly related chassis/suspension DTCs
- Intermittent or constant fault lamp, possible degraded suspension performance
What to check
- Read and record freeze frame and full DTC list with a capable scan tool
- Visually inspect right front sensor, mounting, linkage and connector for damage, contamination or loose fasteners
- Inspect wiring harness along routing for chafes, pinches, or repairs
- Backprobe connector and verify reference voltage (usually ~5 V) and ground at key on
- Measure sensor signal voltage while raising/lowering suspension to confirm smooth change
- Wiggle harness and connector while monitoring live data to look for intermittent changes
Signal parameters
- Sensor type: typically analog position sensor (potentiometer) or Hall-effect position sensor
- Reference voltage (typical): ~5.0 V (verify with service data)
- Signal voltage range (expected): ~0.2–4.8 V depending on travel; mid-position ~2.5 V
- Signal should change smoothly and proportionally with suspension travel (no jumps or dropouts)
- Connector pin resistance to ground: low continuity for ground; verify per service specs
- No CAN parameter response does not necessarily indicate analog failure — verify both analog circuit and module messages
Diagnostic algorithm
- Retrieve all stored codes and freeze frame with a scan tool; note any related chassis or module codes.
- Attempt to operate suspension and observe live data for right front position sensor. Note if the value is fixed, erratic, or out of expected range.
- Visually inspect sensor assembly, mounting, linkage and harness for damage, contamination, water ingress or disconnected connectors.
- With ignition ON (engine off), backprobe the sensor connector and verify reference voltage and ground. Compare against service manual values.
- Measure sensor signal voltage while an assistant moves the suspension or with suspension control commands. Signal should change smoothly across the expected range.
- Perform a wiggle test on harness and connector while watching live data to find intermittent opens/shorts.
- Check continuity and resistance of wiring between sensor connector and the control module; check for short to battery or ground.
- If wiring and power/ground are good but signal is out of spec, replace the right front position sensor. Use OEM or equivalent part.
- If sensor replacement does not clear code or if there is no signal at connector, inspect/repair wiring to the control module and verify module input. Reprogram/replace module only if confirmed faulty per service procedures.
- After repair, clear codes, cycle ignition and perform functional test or road test to confirm the fault does not return.
Likely causes
- Damaged sensor wiring (pinched, chafed, rodent damaged) between sensor and control module
- Corrosion in connector terminals causing intermittent signal or high resistance
- Sensor internal failure (potentiometer, Hall element) causing stuck or erratic voltage
- Connector not fully seated after service or collision repair
- Battery voltage problems or blown fuse feeding the sensor circuit
Fault status
Status
Right front position sensor input is out of range or not present. The suspension control module has detected an invalid or missing signal from the right front height/position sensor.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
Repair manuals
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