C1885 Rear Right Height Sensor Circuit Failure
The C1885 code indicates a fault in the rear right height sensor circuit of the air suspension system. This sensor monitors the vertical position of the body relative to the rear right axle, sending a variable voltage signal to the suspension control module. The code sets when the module detects an out-of-range signal, open circuit, short to ground or battery, or erratic sensor response. The air suspension system relies on these sensors to maintain a constant ride height regardless of vehicle load.
1. Commonly Affected Makes
2. Most Common Causes
- Damaged or worn rear right height sensor
- Cut, corroded, or poorly connected sensor wiring
- Short to ground or battery in the sensor circuit
- Moisture, corrosion, or bent pins in the sensor connector
- Misalignment or mechanical damage to the sensor arm or link
- Internal failure of the suspension control module (rare)
3. Symptoms You Will Notice
- Vehicle sits unevenly, especially on the rear right side
- Air suspension warning light on the dashboard
- Rough or unstable ride quality
- Suspension fails to adjust ride height properly
4. Step-by-Step Diagnosis
Scan for additional codes and check freeze frame data
Visually inspect the rear right 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 arm
Inspect the sensor arm and link for binding or damage
If all else is good, test the sensor by substitution or check the control module
5. Frequently Asked Questions
Is it safe to drive?▼
Driving with this code is not recommended for long distances. The vehicle may have reduced handling and stability, especially if the suspension is not maintaining proper ride height. It is best to have it diagnosed and repaired promptly.
How much does it cost to fix?▼
Repair costs typically range from $200 to $600, depending on whether the sensor itself needs replacement ($100-$300) or if wiring repairs are needed. Labor adds $100-$200. Control module replacement is rare and more expensive.