OBD Guide
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C1921

VAPS Solenoid Actuator Output Circuit Failure

C1921 is an OBD-II diagnostic trouble code meaning: VAPS Solenoid Actuator Output Circuit Failure. Common causes: open or short circuit in wiring harness, vaps solenoid valve (solenoid) malfunction. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Firm steering
  • Uneven steering effort
  • Check Engine Light Is On
  • Reduced power steering efficiency

Causes

  • Open or short circuit in wiring harness
  • VAPS solenoid valve (solenoid) malfunction
  • Problems with the steering force control unit
  • Corrosion or oxidation of contacts

How to Fix

  1. Check the integrity of the wiring harness and contacts
  2. Test VAPS solenoid resistance
  3. Check voltage on control circuit
  4. Replace solenoid if necessary
  5. Reset the error and take a test drive

Related codes

C1910C1920C1922C1925

FAQ

What does the C1921 code mean?

C1921 is an OBD-II diagnostic trouble code that indicates: VAPS Solenoid Actuator Output Circuit Failure

What causes a C1921 error code?

The most common causes of C1921 include: Open or short circuit in wiring harness; VAPS solenoid valve (solenoid) malfunction; Problems with the steering force control unit; Corrosion or oxidation of contacts.

How do I fix a C1921 diagnostic trouble code?

To fix C1921: Check the integrity of the wiring harness and contacts. Test VAPS solenoid resistance. Check voltage on control circuit. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1921?

Limited driving only, diagnose soon

How much does it cost to fix C1921?

The estimated repair cost for C1921 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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