What Does C1758 Mean?
The front air suspension height sensor high-range (SE) signal circuit is shorted to battery voltage. The air suspension module is seeing a constant high voltage on the sensor signal wire instead of a variable ride height signal. This makes front height measurement impossible.
Common Causes
35%
Chafed signal wire contacting a 12V power wire in the harness
25%
Short to power inside the height sensor connector due to corrosion or bent pins
25%
Internal sensor failure pulling the signal line high
15%
Aftermarket wiring modification creating a short to battery
Diagnostic Steps
1
Step 1: Disconnect the front height sensor and measure voltage on the signal wire at the harness side — if still at battery voltage, the short is in the harness.
2
Step 2: Disconnect at the module end and check the harness alone for short to Vbatt on the signal wire.
3
Step 3: Trace the wiring harness visually from the sensor to the module, looking for chafing or melted insulation where it contacts power circuits.
4
Step 4: If the harness is clear, test the sensor itself by measuring between the signal pin and power pin for an internal short.
5
Step 5: Repair the short, replace the sensor if needed, clear codes, and run the air suspension calibration.
Estimated Repair Cost
$150 - $500
Parts + labor, varies by vehicle and location
The front air suspension height sensor high-range (SE) signal circuit is shorted to battery voltage. The air suspension module is seeing a constant high voltage on the sensor signal wire instead of a variable ride height signal. This makes front height measurement impossible.
The most common cause of C1758 (Air Suspension Front Height Sensor High (SE) Signal Circuit Short To Battery) is: Chafed signal wire contacting a 12V power wire in the harness
Typical repair costs for C1758 range from $150 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Front ride height cannot be regulated. Vehicle may default to a fixed height. Drivable at reduced speeds but handling may be compromised.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1758 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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