OBD Guide
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B1438

Wiper Mode Select Switch Circuit Failure

B1438 is an OBD-II diagnostic trouble code meaning: Wiper Mode Select Switch Circuit Failure. Common causes: open or short circuit in wiring harness, malfunction of the wiper mode switch. Estimated repair cost: $33–167.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$33–167 (est.)

Symptoms

  • Wipers don't work
  • The wipers only work in one mode
  • Random on/off of wipers
  • Problems with switching wiper speeds

Causes

  • Open or short circuit in wiring harness
  • Malfunction of the wiper mode switch
  • Problems with wiper relays
  • Control unit malfunction
  • Oxidation of contacts

How to Fix

  1. Check the condition of the wiring harness for damage
  2. Check the wiper mode switch
  3. Test the wiper relay
  4. Check the control unit for errors
  5. Clean contacts and connectors from oxides

Related codes

B1437B1439B1440

FAQ

What does the B1438 code mean?

B1438 is an OBD-II diagnostic trouble code that indicates: Wiper Mode Select Switch Circuit Failure

What causes a B1438 error code?

The most common causes of B1438 include: Open or short circuit in wiring harness; Malfunction of the wiper mode switch; Problems with wiper relays; Control unit malfunction.

How do I fix a B1438 diagnostic trouble code?

To fix B1438: Check the condition of the wiring harness for damage. Check the wiper mode switch. Test the wiper relay. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1438?

Do not drive — repair immediately

How much does it cost to fix B1438?

The estimated repair cost for B1438 is $33–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat