What Does C1879 Mean?
The air suspension left front (LF) air spring solenoid output circuit is shorted to battery voltage. The control module has detected unwanted voltage on the LF solenoid circuit, indicating a wiring fault. This can lead to uncontrolled solenoid operation, over-inflation of the LF air spring, or the module shutting down the air suspension system for protection.
Common Causes
35%
Chafed or damaged wire insulation in the LF solenoid harness contacting a power-carrying wire or terminal
25%
Pinched harness at a connector, frame clip, or body pass-through creating a short to a power source
20%
Moisture and corrosion in the LF solenoid connector bridging to a powered terminal
12%
Internal solenoid short from the coil winding to the power supply terminal
8%
Air suspension module output driver internally shorted to power supply
Diagnostic Steps
1
Disconnect the LF solenoid connector. With the solenoid not commanded, measure voltage on the module-side harness wires. Battery voltage on the ground-switched line confirms a harness short to power.
2
With the solenoid disconnected, measure resistance from each terminal to battery positive. Low resistance pinpoints whether the short is in the solenoid or the harness.
3
Carefully inspect the LF solenoid harness routing, paying special attention to the left front fender well, areas near the fuse box, and any location where the harness runs alongside power distribution cables.
4
Isolate harness sections by disconnecting at intermediate junctions and testing each segment for the short to battery voltage.
5
If the harness is clear, disconnect at the module and test the module output pin to battery positive to check for an internal module short.
Estimated Repair Cost
$150 - $900
Parts + labor, varies by vehicle and location
The air suspension left front (LF) air spring solenoid output circuit is shorted to battery voltage. The control module has detected unwanted voltage on the LF solenoid circuit, indicating a wiring fault. This can lead to uncontrolled solenoid operation, over-inflation of the LF air spring, or the m...
The most common cause of C1879 (Air Suspension LF Air Spring Solenoid Output Circuit Short To Battery) is: Chafed or damaged wire insulation in the LF solenoid harness contacting a power-carrying wire or terminal
Typical repair costs for C1879 range from $150 to $900, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A short to battery on the LF solenoid circuit could cause uncontrolled inflation of the left front air spring, risking over-pressurization and potential air spring failure. Continuous current draw can also overheat wiring, creating a fire risk. Do not drive until the short is located and repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1879 to identify the root cause.
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Quick Info
Category
Chassis
System
Air Suspension
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
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