What Does C1723 Mean?
The power supply circuit for the air suspension height sensor is shorted to ground. This fault means the 5V reference voltage feeding the height sensor is being pulled to zero volts, so the sensor cannot generate a valid signal. The suspension module loses its ability to determine vehicle ride height, causing the system to enter a fault mode and disable automatic height adjustments.
Common Causes
35%
Damaged or chafed wiring harness with the sensor power wire contacting chassis or body ground
25%
Height sensor with internal short to ground, pulling down the 5V reference
20%
Water-damaged or corroded connector causing low-resistance path to ground
15%
Pinched wiring during previous suspension service or body work
5%
Faulty suspension control module with failed internal 5V reference regulator
Diagnostic Steps
1
Disconnect the height sensor connector and measure the voltage on the power supply pin from the module — if 5V returns with the sensor disconnected, the sensor itself is shorted internally.
2
With the sensor disconnected, measure resistance from the power supply wire to chassis ground — should read OL. A low reading (under 10k ohms) confirms a harness short to ground.
3
Inspect the height sensor connector for water intrusion, green corrosion on pins, or damaged seals — these sensors are located near suspension components and highly exposed to road spray.
4
Check if the 5V reference is shared with other sensors (throttle position, MAP, etc.). If other sensors share this reference and also show faults, the issue may be at the module or a common harness section.
5
Trace the power wire from the sensor back toward the module, checking each harness clip point, body pass-through grommet, and anywhere the harness contacts metal for insulation damage.
Estimated Repair Cost
$100 - $600
Parts + labor, varies by vehicle and location
The power supply circuit for the air suspension height sensor is shorted to ground. This fault means the 5V reference voltage feeding the height sensor is being pulled to zero volts, so the sensor cannot generate a valid signal. The suspension module loses its ability to determine vehicle ride heigh...
The most common cause of C1723 (Air Suspension Height Sensor Power Circuit Short To Ground) is: Damaged or chafed wiring harness with the sensor power wire contacting chassis or body ground
Typical repair costs for C1723 range from $100 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle can be driven at moderate speeds. The air suspension will not self-level, which may result in an uneven ride height. This affects handling dynamics and headlight aim. Avoid heavy loading or towing, and have the repair completed promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1723 to identify the root cause.
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Quick Info
Category
Chassis
System
Air Suspension
Difficulty
Type
Manufacturer
Recommended Tools
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