AutoCodes – Dodge – B166B Dodge

B166B Dodge 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 Dodge 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.

Save to My Repairs My Repairs

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

Code Popularity 1,392

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
Add Comment

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

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

What does this mean?

What are the Possible Causes of the DTC B166B Dodge?

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 Dodge?

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 Dodge 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 Dodge code?

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

Need Help with the Code?

Get the B166B Dodge 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 Dodge Code

1. What are common symptoms of OBDII code B166B in a Dodge related to the left trailer tow lamp control circuit?

- Common symptoms include the left trailer tow lamp not functioning properly or not illuminating at all.

2. What are possible causes of OBDII code B166B in a Dodge indicating a low left trailer tow lamp control circuit?

- Possible causes may include a faulty trailer tow lamp, damaged wiring, a blown fuse, or a malfunctioning control module.

3. How can I diagnose the issue causing OBDII code B166B in a Dodge for the left trailer tow lamp control circuit?

- You can start by visually inspecting the trailer tow lamp and its wiring for any visible damage. Using a multimeter to test for continuity and voltage can help pinpoint the issue.

4. Can a blown fuse be a common reason for OBDII code B166B in a Dodge related to the left trailer tow lamp control circuit?

- Yes, a blown fuse can often be the culprit for this code. Check and replace any blown fuses in the circuit to see if it resolves the issue.

5. Is it recommended to check the trailer connections when troubleshooting OBDII code B166B for the left trailer tow lamp control circuit in a Dodge?

- Yes, checking the trailer connections for any loose or damaged wiring is essential as poor connections can cause this code to trigger.

6. What are some repair tips for resolving OBDII code B166B in a Dodge concerning the left trailer tow lamp control circuit?

- Repair tips include repairing or replacing any damaged wiring, checking and replacing the trailer tow lamp if necessary, and ensuring all connections are secure.

7. Can moisture or corrosion in the trailer tow lamp socket cause OBDII code B166B in a Dodge?

- Yes, moisture or corrosion in the lamp socket can disrupt the circuit and trigger this code. Cleaning or replacing the socket may resolve the issue.

8. Should I reset the OBDII code B166B after making repairs to the left trailer tow lamp control circuit in a Dodge?

- Yes, it is recommended to clear the code using an OBDII scanner after making any repairs to see if the issue has been successfully resolved.

9. Are there any specific Dodge models known to have recurring issues with OBDII code B166B related to the left trailer tow lamp control circuit?

- While this code can occur in various Dodge models with towing capabilities, it may be more prevalent in trucks and SUVs equipped with trailer tow packages.

10. Can a professional automotive technician help diagnose and repair OBDII code B166B for the left trailer tow lamp control circuit in a Dodge?

- Yes, seeking assistance from a qualified technician can ensure thorough diagnosis and proper repair of the issue, especially if you are unfamiliar with automotive electrical systems.