AutoCodes – Generic – B2178

B2178 Code - Window Driver Rear Remote Down Switch Short To Battery

Quick Answer

The Body Control Module (BCM) monitors the Window Driver Rear Remote Down Switch. Common causes include Faulty Window Driver Rear Remote Down Switch, Window Driver Rear Remote Down Switch harness is open or shorted, Window Driver Rear Remote Down Switch 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: B2178 indicates Window Driver Rear Remote Down Switch Short To Battery.
Common causes: Common causes include Faulty Window Driver Rear Remote Down Switch, Window Driver Rear Remote Down Switch harness is open or shorted, Window Driver Rear Remote Down Switch 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.

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Code Popularity 3,541

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 Sep 22, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2178 Description

The Body Control Module (BCM) monitors the Window Driver Rear Remote Down Switch. The BCM sets the OBDII code when the Window Driver Rear Remote Down Switch is not to factory specifications.

OBDII Code B2178 - Window Driver Rear Remote Down Switch Short To Battery - AutoCodes.com — B2178 Code - Window Driver Rear Remote Down Switch Short To Battery

What does this mean?

What are the Possible Causes of the DTC B2178?

Faulty Window Driver Rear Remote Down Switch
Window Driver Rear Remote Down Switch harness is open or shorted
Window Driver Rear Remote Down Switch circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B2178?

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 B2178 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 B2178 code?

Need more information on how to fix the B2178 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2178 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B2178 Acura — Driver Side Power Window Motor Pulse 'B' Error
B2178 Honda — Driver Side Power Window Motor Pulse 'B' Error

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 B2178 Code

1. What does OBDII code B2178 mean?

Code B2178 indicates a short circuit to the battery in the driver rear window's remote down switch circuit, typically related to electrical issues in the wiring or switch.

2. What are the symptoms of code B2178?

The symptoms may include the rear driver-side window not operating, the window moving unexpectedly, or unusual behavior like the window lowering on its own.

3. What causes code B2178 to trigger?

Common causes include damaged or frayed wiring, a faulty rear remote down switch, or a malfunction in the window control module.

4. Can I still drive my vehicle with code B2178?

Yes, you can drive the vehicle, but the rear driver-side window may not function properly, which could lead to inconvenience or security concerns.

5. How is code B2178 diagnosed?

A technician will inspect the wiring, test the rear remote down switch, and check for shorts or voltage irregularities in the circuit.

6. How can I fix the B2178 code?

Repairs may include replacing damaged wiring, repairing the rear remote down switch, or replacing the window control module if necessary.

7. Can I clear code B2178 without fixing the issue?

Clearing the code without addressing the underlying problem may only provide a temporary solution, as the code will likely return.

8. How much does it cost to repair code B2178?

Repair costs can vary depending on the extent of the damage, but wiring repairs or switch replacements typically range from $100 to $300.

9. Can I fix code B2178 myself?

If you're experienced with automotive electrical systems, you may be able to inspect and repair wiring or replace the switch. Otherwise, itâ€™s best to consult a professional.

10. What tools are needed to diagnose code B2178?

Youâ€™ll need a multimeter to test the circuit, a wiring diagram for your vehicle, and possibly an OBDII scanner to confirm and clear the code after repairs.