OBD Guide
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B1894

Wiper Rear Motor Speed Sense Circuit Failure

B1894 is an OBD-II diagnostic trouble code meaning: Wiper Rear Motor Speed Sense Circuit Failure. Common causes: open or short circuit in wiring harness, faulty engine speed sensor. Estimated repair cost: $56–167.

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

Symptoms

  • Rear wiper does not work
  • Rear wiper intermittent operation
  • Incorrect brush speed

Causes

  • Open or short circuit in wiring harness
  • Faulty engine speed sensor
  • Problems with the control unit
  • Corrosion or poor contact in connectors

How to Fix

  1. Check the wiring harness for opens and shorts
  2. Check engine speed sensor
  3. Check connectors and contacts for corrosion
  4. If necessary, replace the sensor or wiring harness
  5. Reset the error and check the system operation

FAQ

What does the B1894 code mean?

B1894 is an OBD-II diagnostic trouble code that indicates: Wiper Rear Motor Speed Sense Circuit Failure

What causes a B1894 error code?

The most common causes of B1894 include: Open or short circuit in wiring harness; Faulty engine speed sensor; Problems with the control unit; Corrosion or poor contact in connectors.

How do I fix a B1894 diagnostic trouble code?

To fix B1894: Check the wiring harness for opens and shorts. Check engine speed sensor. Check connectors and contacts for corrosion. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1894?

Limited driving only, diagnose soon

How much does it cost to fix B1894?

The estimated repair cost for B1894 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat