AutoCodes – Generic – B1894

B1894 Code - Wiper Rear Motor Speed Sense Circuit Failure

Quick Answer

The Body Control Module (BCM) monitors the Wiper Rear Motor Speed Sense. Common causes include Faulty Wiper Rear Motor, Wiper Rear Motor harness is open or shorted, Wiper Rear Motor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: B1894 indicates Wiper Rear Motor Speed Sense Circuit Failure.
Common causes: Common causes include Faulty Wiper Rear Motor, Wiper Rear Motor harness is open or shorted, Wiper Rear Motor circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 5,749

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 26, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code B1894 Description

The Body Control Module (BCM) monitors the Wiper Rear Motor Speed Sense. The BCM sets the OBDII code when the Wiper Rear Motor Speed Sense is not to factory specifications.

OBDII Code B1894 - Wiper Rear Motor Speed Sense Circuit Failure - AutoCodes.com — B1894 Code - Wiper Rear Motor Speed Sense Circuit Failure

What does this mean?

What are the Possible Causes of the DTC B1894?

Faulty Wiper Rear Motor
Wiper Rear Motor harness is open or shorted
Wiper Rear Motor circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B1894?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1894 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B1894 code?

Need more information on how to fix the B1894 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1894 code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B1894 Code

1. What are the common symptoms of OBDII code B1894 (Wiper Rear Motor Speed Sense Circuit Failure)?

The common symptoms of code B1894 include the rear wiper not working or operating at an abnormal speed.

2. What are the possible causes of OBDII code B1894?

Possible causes of code B1894 include a faulty rear wiper motor, damaged wiring or connectors in the rear wiper system, or a defective rear wiper speed sensor.

3. How can I diagnose OBDII code B1894?

Diagnosing code B1894 involves inspecting the rear wiper motor, checking the wiring and connectors for damage, and testing the rear wiper speed sensor using a multimeter or scan tool.

4. What are the repair options for OBDII code B1894?

Repair options for code B1894 may include replacing the rear wiper motor, repairing or replacing damaged wiring or connectors, or replacing the rear wiper speed sensor.

5. Can I drive my vehicle with OBDII code B1894?

It is generally safe to drive your vehicle with code B1894, but you should address the issue promptly to ensure proper functioning of the rear wiper system.

6. How much does it cost to repair OBDII code B1894?

The cost of repairing code B1894 can vary depending on the specific cause of the issue, but it may range from a few hundred to a few thousand dollars, including parts and labor.

7. Can I reset OBDII code B1894 without fixing the underlying issue?

Resetting the code without addressing the root cause will only temporarily clear the check engine light. The code is likely to reappear until the issue is resolved.

8. Is OBDII code B1894 a common problem in vehicles?

Code B1894 (Wiper Rear Motor Speed Sense Circuit Failure) is not as common as some other OBDII codes, but it can occur in vehicles with rear wiper systems.

9. Can extreme weather conditions cause OBDII code B1894 to trigger?

Extreme weather conditions, such as heavy rain, snow, or extreme temperatures, can potentially contribute to the triggering of code B1894 if they lead to damage in the rear wiper system components.

10. How long does it typically take to repair OBDII code B1894?

The repair time for code B1894 can vary depending on the complexity of the issue and the availability of parts. In general, it may take a few hours to a full day to diagnose and repair the problem.