What Does C1705 Mean?
The suspension control module has detected that the left rear center sensor circuit is shorted to battery voltage. This sensor, typically a body accelerometer or secondary height sensor mounted near the center of the rear axle area, is reporting a constant high voltage instead of its normal dynamic signal. The system uses this input for precise body motion detection, and the fault will degrade the ride control system's ability to respond to road inputs at the left rear.
Common Causes
35%
Wiring harness damage with the signal wire chafing against a power source near the rear axle area
25%
Corroded connector with internal pin bridging between the supply and signal circuits
25%
Internal sensor failure with output shorted to the internal voltage reference
15%
Aftermarket accessory wiring routed near the sensor harness causing interference or a short
Diagnostic Steps
1
Backprobe the left rear center sensor signal wire at the module connector with key on engine off — should read a variable signal, not near battery voltage (12–14V).
2
Disconnect the left rear center sensor and recheck the signal wire at the module — if voltage drops, the sensor is shorted internally; if it remains high, the wiring has a short to power.
3
Trace the sensor wiring harness from the module to the sensor, inspecting for chafing, pinching, or where it crosses near power-carrying wires. Focus on areas near the rear axle, frame rails, and exhaust.
4
Inspect the sensor connector for moisture, corrosion, or damaged pins. Measure pin-to-pin resistance to identify any internal shorts.
5
If wiring is clean, replace the left rear center sensor and verify the output signal is within normal operating range (0.5–4.5V typically) during a road test.
Estimated Repair Cost
$100 - $500
Parts + labor, varies by vehicle and location
The suspension control module has detected that the left rear center sensor circuit is shorted to battery voltage. This sensor, typically a body accelerometer or secondary height sensor mounted near the center of the rear axle area, is reporting a constant high voltage instead of its normal dynamic ...
The most common cause of C1705 (Left Rear Center Sensor Circuit Short to Vbat) is: Wiring harness damage with the signal wire chafing against a power source near the rear axle area
Typical repair costs for C1705 range from $100 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The suspension system loses one center sensor input and will operate with reduced data for ride optimization. The vehicle is safe for normal driving, but ride quality will be degraded. The system will default to a conservative damping setting. Repair within a week.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1705 to identify the root cause.
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Quick Info
Category
Chassis
System
Suspension / Ride Control
Difficulty
Type
Manufacturer
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