C1847: Front Air Suspension Inflator Solenoid Short to Battery
Diagnostic trouble code C1847 indicates a short to battery positive (B+) in the output circuit of the front air suspension inflator solenoid. This solenoid controls compressed air flow to the front struts to regulate vehicle ride height. The suspension control module has detected that the voltage on the solenoid control circuit remains high when it should be off, suggesting the wiring or solenoid itself is shorted to the positive power supply. This code is specific to Ford and Lincoln vehicles with electronically controlled air suspension systems, typically found on luxury models and SUVs.
1. Commonly Affected Makes
2. Most Common Causes
- Front air suspension inflator solenoid with internally shorted coil
- Solenoid output circuit wiring with damaged insulation shorting to B+
- Solenoid connector with bent pins, corrosion, or moisture causing a short
- Air suspension control module (VDCM or equivalent) with internally damaged output driver
- Suspension circuit fuse or relay fault causing constant power to the solenoid
3. Symptoms You Will Notice
- Air suspension warning light illuminated on the dashboard
- Vehicle sitting unevenly or lower than normal at the front
- Air compressor running continuously or not at all
- Suspension height adjustment inoperative
4. Step-by-Step Diagnosis
Scan for additional codes and verify C1847 is present
Visually inspect the solenoid connector and wiring for damage, corrosion, or shorts
Disconnect the solenoid and measure resistance across its coil; compare to specifications (typically 2-10 ohms)
Check for battery voltage on the solenoid control wire with the ignition on and solenoid commanded off; voltage should be near 0V
If wiring and solenoid check out, test the suspension control module output driver or replace the module
5. Frequently Asked Questions
Is it safe to drive?▼
Driving is not recommended as the short can cause the air compressor to run continuously, leading to battery drain, compressor failure, or a fire hazard. The vehicle may also have unstable ride height, affecting handling and safety.
How much does it cost to fix?▼
Repair costs typically range from $200 to $800, depending on the cause. A simple wiring repair may cost $200-$400, while replacing the solenoid or control module can run $400-$800 or more.