What Does C1423 Mean?
The suspension control module has detected a general electrical circuit failure in the left front (LF) electronically controlled damper. The module is unable to properly communicate with or control the LF damper actuator. The adaptive suspension will default the LF damper to a fixed setting, and the warning light will illuminate.
Common Causes
35%
Faulty LF electronic damper actuator with internal electrical failure
30%
Damaged or corroded wiring between suspension module and LF damper
20%
Poor connector contact at the LF damper or suspension module
15%
Suspension control module internal driver circuit failure
Diagnostic Steps
1
Inspect the LF damper actuator connector at the top of the shock absorber. Check for corrosion, water damage, bent pins, or broken locking tabs.
2
Measure the LF damper actuator coil resistance — typical range is 1-5 ohms. Compare with the RF side for reference. Out-of-range values indicate a failed actuator.
3
Verify wiring continuity from the suspension module connector to the LF damper connector. Test both signal and ground paths.
4
Check insulation resistance from each wire to ground and between wires to rule out partial shorts that may cause erratic behavior.
5
Use the scan tool to command the LF damper through its full range of settings. Monitor current draw — it should vary proportionally with the commanded stiffness level. No response indicates actuator or driver failure.
Estimated Repair Cost
$200 - $1,000
Parts + labor, varies by vehicle and location
The suspension control module has detected a general electrical circuit failure in the left front (LF) electronically controlled damper. The module is unable to properly communicate with or control the LF damper actuator. The adaptive suspension will default the LF damper to a fixed setting, and the...
The most common cause of C1423 (Damper LF Circuit Failure) is: Faulty LF electronic damper actuator with internal electrical failure
Typical repair costs for C1423 range from $200 to $1,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The LF damper operates at a fixed default rate. Ride quality is degraded and handling balance is slightly off. Safe for normal driving. Repair when convenient to restore full adaptive suspension capability.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1423 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Chassis
System
Suspension / Ride Control
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
