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Engine-Codes – RAM – B16D4 RAM

B16D4 RAM Code - Right DRL Lamp Control Circuit Low

Quick Answer

The B16D4 diagnostic trouble code (DTC) refers to the Right DRL (Daytime Running Lamp) Lamp Control Circuit being low. Common causes include Faulty DRL lamp bulb, Damaged wiring harness, Malfunctioning DRL control module. 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
B16D4 RAM indicates Right DRL Lamp Control Circuit Low.
Common causes
Common causes include Faulty DRL lamp bulb, Damaged wiring harness, Malfunctioning DRL control module.
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.
What is this?
Table of contents Created and updated by William Orellana on Aug 30, 2024
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Code B16D4 RAM Description

The B16D4 diagnostic trouble code (DTC) refers to the Right DRL (Daytime Running Lamp) Lamp Control Circuit being low. This code indicates that there is an issue with the circuit that controls the right DRL lamp, which is responsible for providing visibility and safety during daytime driving. The DRL system is designed to automatically turn on the headlights at reduced intensity when the vehicle is running, improving visibility to other drivers on the road.

OBDII Code B16D4 RAM - Right DRL Lamp Control Circuit Low
B16D4 RAM Code - Right DRL Lamp Control Circuit Low

Common Causes of B16D4 RAM

  1. Faulty DRL lamp bulb.
  2. Damaged wiring harness.
  3. Malfunctioning DRL control module.
  4. Poor electrical connection in the circuit.
  5. Corrosion or moisture in the DRL lamp assembly.

Symptoms of B16D4 RAM

  1. Right DRL lamp not working or flickering.
  2. Dashboard warning light indicating a DRL system fault.
  3. Reduced visibility during daytime driving.
  4. Vehicle failing inspection due to DRL lamp issue.

How to Fix B16D4 RAM

  1. Inspect the DRL lamp bulb and replace if necessary.
  2. Check the wiring harness for damage and repair or replace as needed.
  3. Test the DRL control module for proper function and replace if faulty.
  4. Ensure all electrical connections in the circuit are secure and free of corrosion.
  5. Clear the DTC and reset the system to verify that the issue has been resolved.

Cost to Fix B16D4 RAM

The typical repair costs for addressing a B16D4 DTC can vary depending on the specific cause of the issue. In general, replacing a DRL lamp bulb may cost between $20 and $50, while repairing or replacing a wiring harness could range from $100 to $300. If the control module needs to be replaced, the cost may be around $150 to $400. Labor costs for diagnosis and repair at an auto repair shop can range from $80 to $150 per hour. It is recommended to consult with a professional technician to get an accurate estimate based on the specific vehicle make and model.

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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 B16D4 RAM Code

1. What does the OBDII code B16D4 mean?

The B16D4 code indicates a fault in the Right Daytime Running Lamp (DRL) Control Circuit, specifically a low voltage condition.

2. What are the symptoms of the B16D4 code?

Symptoms include the right daytime running lamp not functioning, a warning light on the dashboard, or a message indicating a lighting issue.

3. What causes the B16D4 code?

Common causes include a faulty right DRL bulb, damaged wiring, a corroded or loose connector, or a malfunctioning DRL control module.

4. Can I still drive with the B16D4 code active?

Yes, you can drive, but the right daytime running light will not function, which may reduce visibility and safety during daylight hours.

5. How do I diagnose the B16D4 code?

Start by inspecting the right DRL bulb, checking for loose or damaged wires, testing the DRL circuit for proper voltage, and scanning for additional codes.

6. How can I fix the B16D4 code?

Possible fixes include replacing the right DRL bulb, repairing or replacing damaged wiring, cleaning connections, or replacing a faulty DRL control module.

7. How much does it cost to repair the B16D4 code?

Repair costs can range from $20 for a replacement bulb to $200 or more if wiring repairs or module replacements are necessary.

8. Can a blown fuse cause the B16D4 code?

Yes, a blown fuse in the DRL circuit can cause a low voltage condition and trigger this code.

9. Will resetting the code fix the issue?

Resetting the code without addressing the underlying issue will not resolve the problem, and the code is likely to return.

10. Is the B16D4 code specific to RAM vehicles?

While the code is commonly associated with RAM vehicles, it may also appear in other makes and models with similar DRL systems.

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