Air Suspension Purge Solenoid Circuit Open
The C1771 code indicates that the air ride control (ARC) module has detected an open circuit in the purge solenoid circuit. This solenoid is responsible for releasing air from the air suspension system to allow the vehicle to lower. An open circuit prevents the module from activating the solenoid, resulting in the inability to vent air from the system. The condition is stored when the module detects interrupted continuity in the solenoid control circuit during normal operation or diagnostic testing.
1. Commonly Affected Makes
2. Most Common Causes
- Faulty air suspension purge solenoid with an open coil
- Damaged, corroded, or disconnected wiring between the ARC module and the solenoid
- Corroded, bent, or moisture-contaminated pins in the solenoid connector
- Blown fuse in the solenoid power supply circuit
- Damaged control output in the air ride control module
- Wiring harness chafed or worn through from friction
3. Symptoms You Will Notice
- Vehicle unable to lower or adjust ride height
- Air suspension warning light illuminated on the dashboard
4. Step-by-Step Diagnosis
Check for blown fuses related to the air suspension system and replace if necessary.
Inspect the purge solenoid connector and wiring for damage, corrosion, or loose connections.
Measure resistance across the solenoid coil; an open circuit indicates a faulty solenoid.
Verify power and ground at the solenoid connector with the ignition on.
If wiring and solenoid are good, test the ARC module output signal; replace module if no signal is present.
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, but the air suspension will not lower properly, and the vehicle may ride at an incorrect height. It is safe for short distances, but have it repaired soon to avoid additional strain on the system.
How much does it cost to fix?▼
Typically between $200 and $600, depending on whether the solenoid, wiring, or module needs replacement. Labor costs vary by shop.