Rear Height Sensor Circuit High Voltage
The C1767 code indicates that the air suspension control module has detected an abnormally high voltage on the rear height sensor signal circuit. This sensor typically outputs a variable voltage signal (0.5V to 4.5V) to report suspension position. A short to battery means the signal wire is electrically contacting a reference voltage, battery, or power circuit, causing the signal to saturate high. The module interprets this as an invalid or out-of-range height position.
1. Commonly Affected Makes
2. Most Common Causes
- Rear height sensor wiring shorted to battery voltage or a 5V/12V circuit
- Internally damaged rear height sensor leaking voltage into the signal line
- Corroded or bent pins in the sensor connector causing terminal contact
- Faulty signal conditioning circuit in the air suspension control module (VSM/RCM)
- Incorrect previous repair or modification to the suspension harness
3. Symptoms You Will Notice
- Suspension warning light illuminated
- Vehicle sitting unevenly or at incorrect ride height
4. Step-by-Step Diagnosis
Check for technical service bulletins (TSBs) related to the vehicle
Visually inspect the rear height sensor wiring and connector for damage, corrosion, or shorts
Measure voltage at the sensor signal wire with key on; should be between 0.5V and 4.5V
If voltage is near battery voltage (12V), isolate the sensor and check for short to power
Test the sensor by substituting a known good unit or checking resistance per manufacturer specs
5. Frequently Asked Questions
Is it safe to drive?▼
Driving is possible but not recommended for long distances. The suspension may not adjust properly, leading to poor ride quality and potential strain on other components.
How much does it cost to fix?▼
Repair costs typically range from $150 to $500, depending on whether the issue is a wiring repair or sensor replacement.