What Does C1706 Mean?
The suspension control module has detected a complete circuit failure for the left rear center sensor. No valid signal is being received from this sensor, which is typically a body accelerometer or secondary height sensor near the center rear of the vehicle. The module cannot determine body motion or position for this zone. The ride control system will default to a fixed damping mode and illuminate the warning light.
Common Causes
35%
Left rear center sensor has completely failed internally (open sensing element)
30%
Open circuit in the wiring harness — broken wire, pulled terminal, or disconnected connector
20%
Connector fully corroded or damaged by water intrusion, preventing any electrical contact
15%
Sensor physically dislodged from its mounting location due to vibration or impact
Diagnostic Steps
1
Visually locate the left rear center sensor and confirm it is physically present, properly mounted, and the connector is plugged in.
2
Measure the 5V reference supply at the sensor connector — if absent, trace the supply wire back to the module for an open circuit.
3
With the sensor connected, measure the signal output with a multimeter — should show a variable voltage. A fixed 0V or no reading indicates a dead sensor or open signal path.
4
Test wiring continuity on all three circuits (supply, signal, ground) from the sensor connector to the module connector. Resistance should be less than 2 ohms on each wire.
5
If wiring is intact and supply voltage is present, replace the left rear center sensor and verify proper signal output during a road test.
Estimated Repair Cost
$100 - $550
Parts + labor, varies by vehicle and location
The suspension control module has detected a complete circuit failure for the left rear center sensor. No valid signal is being received from this sensor, which is typically a body accelerometer or secondary height sensor near the center rear of the vehicle. The module cannot determine body motion o...
The most common cause of C1706 (Left Rear Center Sensor Circuit Failure) is: Left rear center sensor has completely failed internally (open sensing element)
Typical repair costs for C1706 range from $100 to $550, depending on the vehicle, location, and whether you do it yourself or go to a shop.
One secondary sensor input is completely lost. The suspension system will use a fallback control strategy with reduced accuracy. The vehicle is safe for routine driving, but ride optimization for the rear will be diminished. Repair within a few days.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1706 to identify the root cause.
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Quick Info
Category
Chassis
System
Suspension / Ride Control
Difficulty
Type
Manufacturer
Recommended Tools
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