What Does C1701 Mean?
The suspension control module has detected a general fault in the left rear sensor circuit. This is a broader classification that can encompass intermittent signal loss, out-of-range readings, or erratic sensor behavior that does not fit a specific short or open circuit pattern. The driver may notice the ride control light illuminating intermittently, with the suspension occasionally feeling inconsistent in its damping behavior.
Common Causes
30%
Intermittent connection at the left rear sensor connector due to loose fit, corrosion, or vibration
30%
Left rear sensor beginning to fail with erratic or noisy output signal
20%
Damaged or chafed wiring causing intermittent signal disruption during suspension movement
20%
Sensor link arm loose or worn, causing inconsistent mechanical input to the sensor
Diagnostic Steps
1
Monitor the left rear sensor signal in real-time on the scan tool while having an assistant cycle the suspension through its travel — watch for dropouts, spikes, or dead spots in the signal.
2
Wiggle-test the left rear sensor connector and wiring harness while monitoring the signal for any intermittent disruptions that correlate with harness movement.
3
Inspect the sensor mechanical linkage — confirm the link arm is securely attached at both ends and has no excessive play or worn pivot points.
4
Check the sensor connector for spread or corroded terminals. Apply dielectric grease to clean contacts and reseat the connector firmly.
5
Compare the left rear sensor reading to the right rear sensor at the same ride height — they should be within 10% of each other. A significant offset indicates the sensor or its linkage has drifted out of calibration.
6
If all physical checks pass, clear the code and drive over varied terrain to see if the code returns — an intermittent code that does not return may indicate a previously loose connection that has been resolved.
Estimated Repair Cost
$80 - $450
Parts + labor, varies by vehicle and location
The suspension control module has detected a general fault in the left rear sensor circuit. This is a broader classification that can encompass intermittent signal loss, out-of-range readings, or erratic sensor behavior that does not fit a specific short or open circuit pattern. The driver may notic...
The most common cause of C1701 (Left Rear Sensor Circuit Fault) is: Intermittent connection at the left rear sensor connector due to loose fit, corrosion, or vibration
Typical repair costs for C1701 range from $80 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The suspension system may intermittently lose left rear position data, causing momentary ride quality changes. The vehicle is generally safe for normal driving, but the ride control system will be inconsistent. Schedule diagnosis within the next week to prevent the fault from progressing to a complete circuit failure.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1701 to identify the root cause.
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Quick Info
Category
Chassis
System
Suspension / Ride Control
Difficulty
Type
Manufacturer
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