OBD Guide
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C1901

Ride Control Right Rear Shock Actuator Circuit Failure

C1901 is an OBD-II diagnostic trouble code meaning: Ride Control Right Rear Shock Actuator Circuit Failure. Common causes: open circuit in the power supply or control circuit of the shock absorber actuator, short circuit in actuator wiring. Estimated repair cost: $56–278.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–278 (est.)

Symptoms

  • Suspension control light is on
  • The suspension is fixed in one stiffness mode
  • Inability to switch suspension modes (Sport/Comfort)
  • Uneven handling due to different stiffness of the struts
  • Fault code in the suspension control unit

Causes

  • Open circuit in the power supply or control circuit of the shock absorber actuator
  • Short circuit in actuator wiring
  • Malfunction of the shock absorber electric actuator itself
  • Actuator connector oxidation
  • Malfunction of the adaptive suspension control unit

How to Fix

  1. Read codes from the adaptive suspension control unit using a scanner
  2. Visually inspect the connector and wiring of the right rear pillar actuator
  3. Measure the resistance of the actuator winding (the norm depends on the model)
  4. Check the supply voltage and control signal at the connector
  5. Replace the actuator if it is confirmed to be faulty
  6. Check the operation of the system after replacement and reset the codes

Related codes

C1902C1911C1901C1903

FAQ

What does the C1901 code mean?

C1901 is an OBD-II diagnostic trouble code that indicates: Ride Control Right Rear Shock Actuator Circuit Failure

What causes a C1901 error code?

The most common causes of C1901 include: Open circuit in the power supply or control circuit of the shock absorber actuator; Short circuit in actuator wiring; Malfunction of the shock absorber electric actuator itself; Actuator connector oxidation.

How do I fix a C1901 diagnostic trouble code?

To fix C1901: Read codes from the adaptive suspension control unit using a scanner. Visually inspect the connector and wiring of the right rear pillar actuator. Measure the resistance of the actuator winding (the norm depends on the model). For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1901?

Do not drive — repair immediately

How much does it cost to fix C1901?

The estimated repair cost for C1901 is $56–278. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat