OBD Guide
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C1938

Malfunction In Front Active Stabilizer Control ECU Short Relay Power Supply IC

C1938 is an OBD-II diagnostic trouble code meaning: Malfunction In Front Active Stabilizer Control ECU Short Relay Power Supply IC. Common causes: faulty power relay, open or short circuit in wiring harness. Estimated repair cost: $56–222.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–222 (est.)

Symptoms

  • ESC/ESP malfunction lamp is on
  • Poor handling when cornering
  • Disabling the stabilization system

Causes

  • Faulty power relay
  • Open or short circuit in wiring harness
  • Problems with the active stabilizer control unit
  • Contact corrosion

How to Fix

  1. Check the condition of the power relay
  2. Diagnose the wiring harness for breaks/short circuits
  3. Check the power and ground of the control unit
  4. Scan the control unit for additional errors
  5. If necessary, replace the relay or control unit

Related codes

C1201C1210U0121

FAQ

What does the C1938 code mean?

C1938 is an OBD-II diagnostic trouble code that indicates: Malfunction In Front Active Stabilizer Control ECU Short Relay Power Supply IC

What causes a C1938 error code?

The most common causes of C1938 include: Faulty power relay; Open or short circuit in wiring harness; Problems with the active stabilizer control unit; Contact corrosion.

How do I fix a C1938 diagnostic trouble code?

To fix C1938: Check the condition of the power relay. Diagnose the wiring harness for breaks/short circuits. Check the power and ground of the control unit. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1938?

Limited driving only, diagnose soon

How much does it cost to fix C1938?

The estimated repair cost for C1938 is $56–222. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat