What Does C1757 Mean?
The front air suspension height sensor high-range (SE) signal circuit is open. The air suspension module sees no signal at all from this sensor, as if the wire is cut or the sensor is disconnected. Without this feedback, the module cannot determine front ride height.
Common Causes
35%
Disconnected or unplugged front height sensor connector
30%
Broken wire in the height sensor signal circuit
20%
Open circuit inside the height sensor (failed internal element)
15%
Corroded connector terminal creating an intermittent open
Diagnostic Steps
1
Step 1: Verify the front height sensor connector is fully seated — push it in firmly and listen for the locking tab click.
2
Step 2: Measure continuity of the signal wire from the sensor connector to the air suspension module connector — an open (OL) reading identifies a broken wire.
3
Step 3: If the harness has continuity, measure the sensor output by applying 5V and ground directly to the sensor — the signal pin should produce a variable voltage as the arm is moved.
4
Step 4: Inspect the wiring for damage where it passes near suspension components that move during travel.
5
Step 5: Repair the open wire or replace the sensor, clear codes, and perform the ride height 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 open. The air suspension module sees no signal at all from this sensor, as if the wire is cut or the sensor is disconnected. Without this feedback, the module cannot determine front ride height.
The most common cause of C1757 (Air Suspension Front Height Sensor High (SE) Signal Circuit Open) is: Disconnected or unplugged front height sensor connector
Typical repair costs for C1757 range from $150 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Front suspension cannot self-level. Vehicle may ride too high or too low in front. Drivable cautiously but repair promptly to restore proper ride height.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1757 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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