AutoCodes – RAM – B166B RAM

B166B RAM Code - Left Trailer Tow Lamp Control Circuit Low

Quick Answer

The Totally Integrated Power Module (TIPM) monitors the Left Trailer Tow Lamp Control. Common causes include Faulty Left Trailer Tow Lamp Bulb, Left Trailer Tow Lamp Bulb harness is open or shorted, Left Trailer Tow Lamp Bulb 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: B166B RAM indicates Left Trailer Tow Lamp Control Circuit Low.
Common causes: Common causes include Faulty Left Trailer Tow Lamp Bulb, Left Trailer Tow Lamp Bulb harness is open or shorted, Left Trailer Tow Lamp Bulb 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 709

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 Jun 12, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B166B RAM Description

The Totally Integrated Power Module (TIPM) monitors the Left Trailer Tow Lamp Control. The TIPM sets the OBDII code when the Left Trailer Tow Lamp Control is not to factory specifications.

OBDII Code B166B RAM - Left Trailer Tow Lamp Control Circuit Low - AutoCodes.com — B166B RAM Code - Left Trailer Tow Lamp Control Circuit Low

What does this mean?

What are the Possible Causes of the DTC B166B RAM?

Faulty Left Trailer Tow Lamp Bulb
Left Trailer Tow Lamp Bulb harness is open or shorted
Left Trailer Tow Lamp Bulb circuit poor electrical connection
Faulty Totally Integrated Power Module (TIPM)

How to Fix the DTC B166B RAM?

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 B166B RAM 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 B166B RAM code?

Need more information on how to fix the B166B RAM code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B166B RAM 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 B166B RAM Code

1. What are the common symptoms of OBDII code B166B RAM?

- Common symptoms include the left trailer tow lamp not working, dim or flickering light, or a dashboard warning light indicating a fault.

2. What are the possible causes of OBDII code B166B RAM?

- The code may be caused by a faulty trailer tow lamp, damaged wiring or connectors, a blown fuse, or a malfunctioning control module.

3. How can I diagnose the issue related to code B166B RAM?

- You can start by inspecting the left trailer tow lamp, checking the wiring and connectors for damage, and testing the fuse related to the circuit. Using an OBDII scanner can help pinpoint the issue.

4. Can I still tow a trailer if I have OBDII code B166B RAM?

- It is not recommended to tow a trailer if the left trailer tow lamp control circuit is malfunctioning, as it can pose safety risks to you and other drivers on the road.

5. How can I repair OBDII code B166B RAM?

- Repair methods may include replacing the faulty trailer tow lamp, repairing or replacing damaged wiring or connectors, and resetting the control module after fixing the issue.

6. Is it safe to continue driving with OBDII code B166B RAM?

- It is generally not safe to drive with this code active, as it may affect the visibility of your trailer tow lamp and increase the risk of accidents, especially in low-light conditions.

7. Can OBDII code B166B RAM be a false alarm?

- In some cases, the code may be triggered by a temporary issue. It is recommended to reset the code and monitor the situation. If the code reappears, further diagnosis and repair are necessary.

8. How much does it typically cost to repair OBDII code B166B RAM?

- The cost of repair can vary depending on the underlying cause of the issue. Simple fixes like replacing a fuse may be inexpensive, while complex repairs involving control module replacement can be more costly.

9. Can a DIY enthusiast fix OBDII code B166B RAM?

- DIY enthusiasts with basic automotive repair skills may be able to diagnose and fix simple issues related to this code, such as replacing a trailer tow lamp or a fuse. However, complex repairs may require professional assistance.

10. How long does it take to repair OBDII code B166B RAM?

- The repair time can vary based on the specific cause of the issue and the complexity of the repair. Simple fixes may take a short amount of time, while more involved repairs could take several hours or more.