What Does C1718 Mean?
The suspension control module has detected a complete circuit failure for the left front center sensor. No valid signal is being received from this body accelerometer or secondary position sensor positioned near the front of the vehicle. The module cannot use this data point for front suspension optimization. The ride control warning light will be on and the system will operate with a reduced sensor set.
Common Causes
35%
Left front center sensor has failed internally with an open sensing element
30%
Open circuit in the wiring — broken wire, disconnected connector, or pulled terminal
20%
Severe connector damage from water intrusion, road salt, or debris
15%
Sensor dislodged from its mounting due to vibration or subframe impact
Diagnostic Steps
1
Locate the left front center sensor and visually confirm it is physically present, securely mounted, and the electrical connector is fully seated.
2
Measure the 5V reference supply at the sensor connector — if absent, trace the supply wire to the module to find the open circuit.
3
With the sensor connected, measure the signal output — a functioning sensor should produce a dynamic voltage. Zero volts or open-line indicates a dead sensor or broken signal wire.
4
Perform continuity tests on all three wires (supply, signal, ground) from the sensor connector to the module connector — each should measure less than 2 ohms.
5
If wiring is intact and supply voltage is present, replace the left front center sensor and verify proper signal output during a test drive.
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 front center sensor. No valid signal is being received from this body accelerometer or secondary position sensor positioned near the front of the vehicle. The module cannot use this data point for front suspension opt...
The most common cause of C1718 (Left Front Center Sensor Circuit Failure) is: Left front center sensor has failed internally with an open sensing element
Typical repair costs for C1718 range from $100 to $550, depending on the vehicle, location, and whether you do it yourself or go to a shop.
One secondary front sensor is non-functional. The suspension system will use remaining sensors with reduced accuracy for front ride control. Safe for normal driving; repair within a few days to restore optimal ride quality.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1718 to identify the root cause.
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Quick Info
Category
Chassis
System
Suspension / Ride Control
Difficulty
Type
Manufacturer
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