What Does C1847 Mean?
The air suspension control module has detected a short to battery voltage in the front inflator solenoid output circuit. Unwanted voltage is present on the solenoid control line, which may cause the solenoid to energize when it should not be, or prevent the module from properly controlling airflow to the front springs. The air suspension warning light will illuminate.
Common Causes
35%
Solenoid control wire insulation damaged and contacting a 12V power source in the wiring harness
25%
Solenoid connector has corrosion or moisture bridging between the power supply and control pins
20%
Front inflator solenoid is internally shorted, feeding voltage back through the control circuit
10%
Incorrect solenoid installed during previous repair (wrong resistance or pin configuration)
10%
Air suspension module output driver has failed with an internal short to the supply rail
Diagnostic Steps
1
Disconnect the front inflator solenoid and measure voltage on the harness-side control pin with ignition on — if battery voltage is present with the solenoid disconnected, the short is in the wiring between the solenoid and the module.
2
If no voltage with the solenoid disconnected, reconnect it and recheck — if voltage now appears, the solenoid is internally shorted and must be replaced.
3
Trace the solenoid control wire through the harness, looking for damaged insulation where the wire contacts other power wires, sharp metal edges, or heat sources.
4
Inspect the solenoid connector for water intrusion, corrosion, or tracking marks between terminals that could create a conductive path from the power pin to the control pin.
5
Verify the correct solenoid part number is installed and matches the OEM specification for the vehicle.
Estimated Repair Cost
$80 - $650
Parts + labor, varies by vehicle and location
The air suspension control module has detected a short to battery voltage in the front inflator solenoid output circuit. Unwanted voltage is present on the solenoid control line, which may cause the solenoid to energize when it should not be, or prevent the module from properly controlling airflow t...
The most common cause of C1847 (Air Suspension Front Inflator Solenoid Output Circuit Short To Battery) is: Solenoid control wire insulation damaged and contacting a 12V power source in the wiring harness
Typical repair costs for C1847 range from $80 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A short to battery on the solenoid circuit can cause uncontrolled air spring inflation or prevent proper deflation, both of which affect ride height and vehicle stability. The solenoid may also overheat. Drive minimally and have the system repaired promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1847 to identify the root cause.
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Quick Info
Category
Chassis
System
Air Suspension System
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
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