C1875: RF Air Spring Solenoid Short to Battery
Diagnostic trouble code C1875 indicates a short-to-battery condition in the output circuit of the right front air spring solenoid. The suspension control module (RAS) detects abnormally high voltage—essentially battery voltage—on the solenoid drive circuit when the solenoid should be off. This prevents the module from properly controlling the air spring's inflation and deflation, often causing the system to disable automatic leveling and illuminate the warning light. The vehicle may sit lower on the affected corner.
1. Commonly Affected Makes
2. Most Common Causes
- Internal short circuit in the right front air spring solenoid
- Chafed or exposed wiring in the control circuit contacting a 12V source
- Moisture or corrosion in the solenoid electrical connector causing a bridge to power
- Internal failure of the suspension control module (damaged output driver)
- Rodent damage to the suspension wiring harness
3. Symptoms You Will Notice
- Vehicle leans or sits lower on the right front corner
- Suspension warning light illuminated on the dashboard
- Automatic leveling function disabled or inoperative
- Air compressor may run excessively or not at all
4. Step-by-Step Diagnosis
Scan for additional codes and check freeze frame data
Visually inspect the right front air spring solenoid connector and wiring for damage, corrosion, or rodent activity
Disconnect the solenoid and measure resistance; compare to specifications (typically 4-12 ohms)
Check for voltage on the solenoid control wire with the ignition on and solenoid commanded off; should be near 0V
If voltage is present, isolate the short by disconnecting the module and checking continuity to battery positive
If wiring and solenoid check out, suspect a faulty suspension control module
5. Frequently Asked Questions
Is it safe to drive?▼
Driving is not recommended because the vehicle may handle unpredictably and the suspension could fail completely, posing a safety risk. Have the issue diagnosed and repaired promptly.
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. Labor and parts vary by vehicle.