What Does C1846 Mean?
The air suspension control module has detected an open circuit in the front inflator solenoid output. There is a break in the electrical path to the solenoid, so the module cannot energize it. The front air springs cannot be inflated or deflated under module control. The driver may notice the front of the vehicle sitting low or the air suspension warning lamp illuminated.
Common Causes
35%
Front inflator solenoid coil has burned open internally from age, heat, or excessive duty cycles
30%
Broken wire in the solenoid circuit, often from vibration fatigue near connectors or where the harness flexes with suspension travel
20%
Solenoid connector is disconnected or has a backed-out terminal pin that is not making contact
15%
Air suspension module output terminal has a damaged or corroded pin
Diagnostic Steps
1
Disconnect the front inflator solenoid connector and measure coil resistance — an OL (infinite) reading confirms the solenoid coil is open and needs replacement.
2
If the solenoid coil reads within specification, check continuity from the solenoid connector pins back to the air suspension module connector — an open reading on either wire indicates a wiring break.
3
Inspect the solenoid connector for backed-out pins by gently tugging each wire — a pin that pulls out easily was not locked in place and was likely intermittent before fully failing.
4
Examine the wiring where it routes near moving suspension components, heat sources, or sharp edges — these are the most likely locations for wire breaks due to fatigue or abrasion.
5
Check the module connector for corrosion or recessed pins that may not be making full contact.
Estimated Repair Cost
$80 - $600
Parts + labor, varies by vehicle and location
The air suspension control module has detected an open circuit in the front inflator solenoid output. There is a break in the electrical path to the solenoid, so the module cannot energize it. The front air springs cannot be inflated or deflated under module control. The driver may notice the front ...
The most common cause of C1846 (Air Suspension Front Inflator Solenoid Output Circuit Open) is: Front inflator solenoid coil has burned open internally from age, heat, or excessive duty cycles
Typical repair costs for C1846 range from $80 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The front air springs cannot be actively controlled. The vehicle will ride at whatever height the front springs settle to naturally. This affects handling, braking balance, and ground clearance. Drive at reduced speed and avoid heavy braking situations until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1846 to identify the root cause.
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Quick Info
Category
Chassis
System
Air Suspension System
Difficulty
Type
Manufacturer
Recommended Tools
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