What Does C1765 Mean?
The rear air suspension height sensor low-range signal circuit has a general failure. This sensor monitors fine ride height adjustments at the rear. The air suspension module cannot get an accurate low-range reading, which may prevent precise leveling and trim adjustments.
Common Causes
35%
Failed rear low-range height sensor
25%
Wiring fault in the low-range signal circuit
20%
Corroded connector at the sensor
15%
Broken sensor linkage not allowing proper arm movement
5%
Control module input circuit fault
Diagnostic Steps
1
Step 1: Inspect the rear low-range height sensor and verify the linkage arm is intact and moves with suspension travel.
2
Step 2: Check the sensor connector for corrosion, water intrusion, and proper pin engagement.
3
Step 3: Verify 5V reference and ground at the sensor connector.
4
Step 4: Manually move the sensor arm while monitoring the signal voltage — expect a smooth, linear sweep.
5
Step 5: Replace the sensor if the signal is absent or erratic, clear codes, and calibrate the system.
Estimated Repair Cost
$200 - $600
Parts + labor, varies by vehicle and location
The rear air suspension height sensor low-range signal circuit has a general failure. This sensor monitors fine ride height adjustments at the rear. The air suspension module cannot get an accurate low-range reading, which may prevent precise leveling and trim adjustments.
The most common cause of C1765 (Air Suspension Rear Height Sensor Low Signal Circuit Failure) is: Failed rear low-range height sensor
Typical repair costs for C1765 range from $200 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Fine rear height adjustment is impaired. Vehicle may ride slightly off-level. Drivable but ride quality and handling may suffer — schedule repair.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1765 to identify the root cause.
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Quick Info
Category
Chassis
System
Air Suspension System
Difficulty
Type
Manufacturer
Recommended Tools
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