What Does C1874 Mean?
The air suspension right front (RF) air spring solenoid output circuit has been detected as open. There is a break in the electrical path to the RF solenoid, meaning the control module cannot energize the valve to inflate the right front air spring. The right front corner of the vehicle will sag, and the suspension warning indicator will illuminate.
Common Causes
35%
Burned-out solenoid coil in the RF air spring valve from age or contamination-induced overheating
30%
Broken wire in the RF solenoid harness, often from vibration fatigue at connection points or road debris impact
20%
Backed-out or corroded pin in the solenoid connector or module connector creating an open
15%
Air suspension module internal open on the RF solenoid driver output circuit
Diagnostic Steps
1
Disconnect the RF solenoid and measure coil resistance between the two terminals. Normal is 8-15 ohms. An open (OL/infinite) reading means the coil is dead and the solenoid must be replaced.
2
If the coil is good, check continuity on both wires from the solenoid connector to the module connector. An open reading on either wire locates the break in the harness.
3
Inspect all connector pins at the solenoid and module for backed-out terminals, corrosion, or damage. Verify connector locks are fully engaged and no pins are recessed.
4
Physically trace the wiring from the RF solenoid (typically routed through the right front wheel well and along the frame) checking for abrasion damage at clip points, grommets, and crossmember pass-throughs.
5
If wiring and solenoid check good, test the module output with the harness connected and the solenoid commanded on. Lack of ground-side switching confirms a module driver fault.
Estimated Repair Cost
$150 - $700
Parts + labor, varies by vehicle and location
The air suspension right front (RF) air spring solenoid output circuit has been detected as open. There is a break in the electrical path to the RF solenoid, meaning the control module cannot energize the valve to inflate the right front air spring. The right front corner of the vehicle will sag, an...
The most common cause of C1874 (Air Suspension RF Air Spring Solenoid Output Circuit Open) is: Burned-out solenoid coil in the RF air spring valve from age or contamination-induced overheating
Typical repair costs for C1874 range from $150 to $700, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The right front corner cannot be inflated, causing the vehicle to lean to the right. This causes pulling during braking, uneven tire wear, and reduced handling stability. Drive at reduced speed to a repair facility and avoid emergency maneuvers. Do not load the vehicle heavily.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1874 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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