Code
C0237
HUMMER
C — Chassis
Right Rear Ride Height Sensor Circuit Range/Performance
Views:
UK: 14
EN: 34
RU: 20
AI status
Completed
Completed
100%
Causes
- Open or short in the right rear ride height sensor wiring
- Poor or corroded connector or pins at the sensor or module
- Failed or intermittent ride height sensor
- Binding, disconnected, damaged or misadjusted sensor linkage
- Contaminated sensor (water, dirt) or internal damage
- Faulty body/control module (less common)
Symptoms
- Suspension-level warning lamp or message on dash
- Vehicle may sit uneven or ride height incorrect at the rear right corner
- Automatic suspension may not level or may behave erratically
- Diagnostic trouble code stored and possibly reduced functionality of leveling system
- Intermittent faults that change with vehicle movement or vibration
What to check
- Read stored freeze frame and live data with a scan tool supporting body/suspension module
- Visually inspect the sensor, linkage and mounting for damage, corrosion or misadjustment
- Check sensor connector for corrosion, bent pins, and secure fit
- Backprobe the sensor connector and measure signal, reference and ground voltages
- Inspect wiring harness for chafing, pinches, or repairs between sensor and module
- Wiggle tests while monitoring live data to locate intermittent wiring faults
Signal parameters
- Sensor type: position/potentiometer or hall-effect position sensor (vehicle dependent)
- Reference voltage: typically VREF ≈ 5.0 V from control module (verify with manufacturer spec)
- Signal output: commonly approximately 0.5 V to 4.5 V depending on arm position; should change smoothly as suspension moves
- Ground: good chassis/module ground present at sensor connector
- Resistance (for potentiometer type): variable across travel; check continuity and smooth change
- No short to battery or ground; no intermittent open circuits
Diagnostic algorithm
- Connect a compatible scan tool and confirm C0237 is current or historic. Record live data and note signal behavior while moving suspension or bouncing the corner.
- Visually inspect right rear sensor, linkage, and connector for damage, corrosion, water intrusion, or binding. Repair any obvious mechanical issues.
- With ignition ON (engine off), backprobe the sensor connector: verify reference voltage, ground continuity, and signal voltage. Compare values to manufacturer specs and expected smooth change when moving linkage.
- Wiggle wiring harness and connector while watching live data for intermittent changes. If fault occurs during wiggle, repair wiring or connector.
- If reference or ground is missing, trace and repair wiring to the body/control module. Check for blown fuses or open circuits.
- If electrical values are good but signal does not change smoothly or is out of range, remove sensor and bench-test (if allowed) or replace the sensor with a known-good unit and retest.
- After repair or replacement, clear codes and perform any required ride height or suspension system relearn/calibration per manufacturer procedure. Recheck for return of the code and confirm normal operation.
- If fault persists after sensor and wiring verified, consider module input circuit testing or replacement per manufacturer diagnostics.
Likely causes
- Corroded or loose connector at the right rear ride height sensor
- Broken or pinched wiring between sensor and body control module
- Sensor potentiometer worn or contaminated — producing erratic voltage
- Mechanical linkage to suspension is seized, bent or disconnected
- Incorrect sensor adjustment or not re-calibrated after replacement
Fault status
Status
Right Rear Ride Height Sensor Circuit — Range/Performance: control module detects signal outside normal bounds or implausible behavior from the right rear ride height sensor circuit.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
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