C1866
Air Suspension Rear Inflator Solenoid Output Circuit Open
C1866 is an OBD-II diagnostic trouble code meaning: Air Suspension Rear Inflator Solenoid Output Circuit Open. Common causes: open or short circuit in solenoid wiring harness, supercharger solenoid valve malfunction. Estimated repair cost: $111–389.
Symptoms
- Uneven body height (the rear end sags or is not adjustable)
- Air suspension error message on the instrument panel
- Automatic rear suspension adjustment does not work
- Hard rear suspension
Causes
- Open or short circuit in solenoid wiring harness
- Supercharger solenoid valve malfunction
- Oxidation or damage to electrical contacts
- Air suspension control module malfunction
- Damage to wiring due to corrosion or mechanical stress
How to Fix
- Check the supply voltage and continuity of the solenoid circuit
- Inspect the wiring harness for damage
- Check solenoid resistance (usually 10-30 ohms)
- Clean the connector contacts
- If necessary, replace the solenoid or repair the wiring harness.
- Reset the error and test the system
Related codes
FAQ
What does the C1866 code mean?
C1866 is an OBD-II diagnostic trouble code that indicates: Air Suspension Rear Inflator Solenoid Output Circuit Open
What causes a C1866 error code?
The most common causes of C1866 include: Open or short circuit in solenoid wiring harness; Supercharger solenoid valve malfunction; Oxidation or damage to electrical contacts; Air suspension control module malfunction.
How do I fix a C1866 diagnostic trouble code?
To fix C1866: Check the supply voltage and continuity of the solenoid circuit. Inspect the wiring harness for damage. Check solenoid resistance (usually 10-30 ohms). For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with C1866?
Limited driving only, diagnose soon
How much does it cost to fix C1866?
The estimated repair cost for C1866 is $111–389. Actual cost depends on your vehicle, location, and labor rates.
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