C1428

Code

Other C — Chassis

Damper RR Circuit Failure

Brand: Other

Type: C — Chassis

Views: UK: 22 EN: 26 RU: 23

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Page language: EN

Causes

Open or short circuit in damper wiring harness
Poor or corroded connector(s)
Failed damper actuator/solenoid or internal sensor
Blown fuse or faulty relay supplying the damper circuit
Poor ground or power supply to the damper or suspension control module
Faulty suspension control/module or software issue

Symptoms

Suspension warning lamp or master warning illuminated
Reduced or fixed damping (ride feels too soft or too stiff)
Uneven ride height or poor vehicle stability
Diagnostic trouble code C1428 stored
Possible abnormal noises from rear-right suspension
Adaptive damping or ride modes not functioning correctly

What to check

Connect a scan tool, read freeze frame and related codes; record live data for rear-right damper
Visual inspection of rear-right damper, harness, and connectors for damage, corrosion, or water
Check fuses and relays feeding the damper/suspension control
Wiggle test wiring with connector attached while monitoring live data for intermittent changes
Measure supply voltage and reference voltages at the damper connector with ignition on
Measure resistance of damper actuator coil or position sensor (if serviceable) and compare to spec

Signal parameters

Battery supply to damper module: typically 11–14 V with ignition on
Sensor/reference voltage (if applicable): ~5.0 V reference expected
Damper position/sensor output: commonly 0.5–4.5 V (varies by manufacturer)
Damper control actuator: driven by PWM — duty cycle 0–100% (typical frequency 50–200 Hz)
Typical damper coil resistance (approximate): 5–50 Ω depending on design
Control current peaks: may reach 2–5 A during activation (verify with manufacturer data)

Diagnostic algorithm

Retrieve all related DTCs and live data with a diagnostic scanner; note freeze-frame and conditions when C1428 occurred.
Perform a visual inspection of the RR damper, wiring, and connectors. Look for damage, pin corrosion, water ingress, or loose clips.
Confirm power and ground at the damper connector: with ignition ON, measure battery voltage at power pin and continuity to chassis ground for ground pin.
Check reference and signal lines: measure reference voltage from the control module (typically ~5 V) and measure sensor/feedback voltage while cycling suspension if possible.
Measure resistance of the damper actuator/sensor (with connector disconnected) and compare to manufacturer specification; if out of range, suspect internal failure.
If values are normal at the connector but signal not reaching module, perform continuity checks back to the module and inspect for short to battery or ground.
Perform a wiggle/road test while monitoring live data to identify intermittent faults; repair or secure any damaged harness.
Check fuses/relays and replace if faulty. If a short is found, repair wiring and replace damaged components as required.
If wiring and power/ground are good but fault remains, test or substitute the damper assembly (if a known-good unit available) to confirm component failure.
If replacement of damper does not clear fault, test or replace the suspension control/module and reprogram if required by manufacturer.
After repairs, clear codes, perform a system initialization/calibration (if required), and verify proper operation with a test drive and scan-tool monitoring.

Likely causes

Broken/shorted wire at wheel or trailing arm where harness flexes
Corroded or pushed-out connector at damper or module
Damper internal coil or position sensor failed
Faulty fuse/relay for suspension control power
Damper control module output stage failure
Intermittent contact due to dirt/water in connector

Fault status

⚠️ Status

C1428 — Damper RR Circuit Failure detected. Possible open circuit, short to power/ground, poor connector, or failed damper actuator/sensor. Inspect wiring, connectors, power/ground, and damper; repair or replace as needed.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0 - 3.0 hours