C1706: Left Rear Height Sensor Circuit Failure
The C1706 code indicates a fault in the left rear ride height sensor circuit of the air suspension system. This sensor monitors the suspension height at the left rear wheel and sends a variable voltage signal to the suspension control module. The fault can be caused by an open or shorted circuit, a sensor out of range, or wiring issues. As a result, the system cannot determine the correct suspension position, which may affect ride comfort and vehicle stability.
1. Commonly Affected Makes
2. Most Common Causes
- Damaged or worn left rear ride height sensor
- Open, shorted, or high-resistance wiring in the sensor circuit
- Corroded, oxidized, or loose pins in the sensor connector
- Faulty suspension control module (VDDM or RCM)
- Mechanical issue with the sensor link or arm
- Weak battery or irregular charging voltage affecting sensor signal
3. Symptoms You Will Notice
- Air suspension warning light on the dashboard
- Uneven ride height, especially at the left rear corner
- Rough or bouncy ride quality
- Suspension system may become inoperative or stuck in one position
4. Step-by-Step Diagnosis
Scan for additional codes and check freeze frame data
Visually inspect the left rear height sensor, wiring, and connector for damage or corrosion
Test sensor voltage and ground at the connector using a multimeter
Check sensor signal output while manually moving the suspension link
Inspect the sensor link for binding or damage
If all else is normal, test the suspension control module for proper operation
5. Frequently Asked Questions
Is it safe to drive?▼
It is generally safe for short distances, but the vehicle may have reduced ride comfort and stability. Prolonged driving could cause uneven tire wear or additional suspension stress. Have it diagnosed soon.
How much does it cost to fix?▼
Repair costs typically range from $200 to $600, depending on whether the sensor, wiring, or control module needs replacement. Labor adds $100–$200.