What Does C1768 Mean?
The rear air suspension height sensor low-range signal circuit is shorted to ground. The module reads near-zero voltage on this signal line constantly. Rear fine-level height sensing is disabled.
Common Causes
35%
Signal wire grounded against the rear chassis or axle housing
25%
Water ingress in the connector creating a ground bridge
25%
Internal ground fault in the height sensor
15%
Wire pinched at a bracket or grommet
Diagnostic Steps
1
Step 1: Disconnect the sensor and measure resistance from the signal pin on the harness side to ground — should be OL.
2
Step 2: If low resistance, disconnect at the module and section-test the wire.
3
Step 3: Inspect the harness for chafing against the rear axle, body, or suspension brackets.
4
Step 4: Test the sensor internally for a signal-to-ground short.
5
Step 5: Repair or replace, clear codes, and calibrate the suspension.
Estimated Repair Cost
$150 - $500
Parts + labor, varies by vehicle and location
The rear air suspension height sensor low-range signal circuit is shorted to ground. The module reads near-zero voltage on this signal line constantly. Rear fine-level height sensing is disabled.
The most common cause of C1768 (Air Suspension Rear Height Sensor Low Signal Circuit Short To Ground) is: Signal wire grounded against the rear chassis or axle housing
Typical repair costs for C1768 range from $150 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Rear height sensing is compromised. Drivable but may ride unevenly. Repair soon to restore proper leveling.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1768 to identify the root cause.
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Quick Info
Category
Chassis
System
Air Suspension System
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
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