Air Suspension Gate Solenoid Circuit Failure
The C1869 code indicates a fault in the output circuit of the air suspension gate solenoid. This solenoid controls the flow of air to and from the air springs or struts to adjust ride height. The suspension control module detects an electrical abnormality such as out-of-range voltage, short to ground or battery, or an open circuit. When this code sets, the module disables height adjustment to protect the system, which may result in incorrect ride height or a warning message on the dash.
1. Commonly Affected Makes
2. Most Common Causes
- Faulty or internally shorted air suspension gate solenoid
- Solenoid circuit wiring shorted to ground or battery voltage
- Open circuit in the solenoid wiring
- Corroded, bent, or poorly connected electrical terminals at the solenoid connector
- Defective suspension control module (ASM)
- Blown fuse or faulty relay for the air suspension system
3. Symptoms You Will Notice
- Incorrect ride height (vehicle too low or too high)
- Warning light or message on the instrument panel related to suspension
4. Step-by-Step Diagnosis
Scan for additional codes and note freeze frame data
Visually inspect the solenoid connector and wiring for damage, corrosion, or loose connections
Test the solenoid resistance and compare to manufacturer specifications
Check for voltage and ground at the solenoid connector with the system active
Inspect the air suspension fuse and relay
If all else is normal, suspect a faulty suspension control module
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, but the vehicle may have an incorrect ride height and the suspension adjustment will be disabled. Drive cautiously and have it repaired soon to avoid potential handling issues.
How much does it cost to fix?▼
Repair costs typically range from $200 to $800, depending on whether the solenoid, wiring, or control module needs replacement.