What Does C1844 Mean?
The air suspension control module has detected a circuit failure in the secondary front inflator solenoid output. Some air suspension systems use dual inflator solenoids for the front axle to provide finer control or redundancy. This solenoid controls airflow to or from the front air springs via a secondary path. The driver may notice slower front ride height adjustment or the front end not reaching the correct height.
Common Causes
35%
Secondary front inflator solenoid coil has failed internally (open, shorted, or intermittent)
25%
Wiring to the secondary front inflator solenoid is damaged, open, or has high resistance connections
20%
Solenoid connector is corroded or disconnected due to exposure to road spray and underbody debris
15%
Air suspension module output driver for the secondary solenoid circuit has failed
5%
Solenoid ground circuit has high resistance or is open
Diagnostic Steps
1
Locate the secondary front inflator solenoid on the valve block or air line manifold and check the connector for damage, corrosion, or disconnection.
2
Disconnect the solenoid and measure coil resistance with a DVOM — typical air suspension solenoid resistance is 3-15 ohms. An OL reading indicates an open coil; a very low reading indicates a shorted coil.
3
With the solenoid disconnected, check for battery voltage on the supply pin and proper ground on the ground pin when the module commands the solenoid on via the scan tool.
4
Measure voltage drop across the solenoid connector pins while the solenoid is commanded on — excessive drop on either the power or ground side indicates wiring issues.
5
If the solenoid and wiring test good, back-probe the module connector and verify the module is outputting the correct drive signal when commanding the solenoid.
Estimated Repair Cost
$100 - $600
Parts + labor, varies by vehicle and location
The air suspension control module has detected a circuit failure in the secondary front inflator solenoid output. Some air suspension systems use dual inflator solenoids for the front axle to provide finer control or redundancy. This solenoid controls airflow to or from the front air springs via a s...
The most common cause of C1844 (Air Suspension Secondary Front Inflator Solenoid Output Circuit Failure) is: Secondary front inflator solenoid coil has failed internally (open, shorted, or intermittent)
Typical repair costs for C1844 range from $100 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The primary inflator system may still function, so the front suspension may operate with reduced capability. The vehicle can be driven at moderate speeds, but the front ride height may not adjust properly. Avoid loading the front heavily and have the system repaired soon.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1844 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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