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B1664 Dodge Code - Rear Fog Lamp Control Circuit High

Quick Answer

The B1664 diagnostic trouble code (DTC) for Dodge vehicles indicates a problem with the rear fog lamp control circuit being too high. Common causes include Faulty rear fog lamp switch, Short circuit in the wiring, Malfunctioning 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
B1664 Dodge indicates Rear Fog Lamp Control Circuit High.
Common causes
Common causes include Faulty rear fog lamp switch, Short circuit in the wiring, Malfunctioning 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 Sep 16, 2024
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Code B1664 Dodge Description

The B1664 diagnostic trouble code (DTC) for Dodge vehicles indicates a problem with the rear fog lamp control circuit being too high. Rear fog lamps are designed to improve visibility in adverse weather conditions, such as heavy rain, fog, or snow, by emitting a bright red light from the rear of the vehicle. This code suggests that there is an issue with the circuit that controls the rear fog lamp, causing it to operate at a higher voltage than normal.

OBDII Code B1664 Dodge - Rear Fog Lamp Control Circuit High
B1664 Dodge Code - Rear Fog Lamp Control Circuit High

Common Causes of B1664 Dodge

  1. Faulty rear fog lamp switch
  2. Short circuit in the wiring
  3. Malfunctioning control module
  4. Defective rear fog lamp

Symptoms of B1664 Dodge

  1. Rear fog lamp stays on continuously
  2. Rear fog lamp flickers on and off
  3. Dashboard warning light for rear fog lamp illuminates
  4. Rear fog lamp does not turn on at all

How to Fix B1664 Dodge

  1. Begin by inspecting the rear fog lamp switch to determine if it is functioning correctly. Replace the switch if necessary.
  2. Check the wiring for any signs of damage or corrosion. Repair or replace any damaged wiring as needed.
  3. Test the control module for proper operation. Replace the module if it is found to be faulty.
  4. Inspect the rear fog lamp itself to ensure it is in good working condition. Replace the lamp if it is defective.
  5. Clear the DTC from the vehicle's memory using a diagnostic scan tool after completing the repairs.

Cost to Fix B1664 Dodge

The cost of repairing a rear fog lamp control circuit high issue can vary depending on the specific cause of the problem and the labor rates in your area. On average, you can expect to pay between $100 and $300 for parts and labor. Keep in mind that diagnostic time and labor rates at auto repair shops can fluctuate, so it's advisable to obtain quotes from multiple sources before proceeding with the repair.

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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 B1664 Dodge Code

1. What does the OBDII code B1664 mean on a Dodge?

The B1664 code indicates a "Rear Fog Lamp Control Circuit High," meaning there is an issue with the electrical circuit responsible for the rear fog lamp.

2. What are the symptoms of the B1664 code on a Dodge?

Common symptoms include the rear fog lamp not working, the rear fog lamp staying on continuously, or an illuminated warning light on the dashboard.

3. What causes the B1664 code to appear?

The most common causes are a faulty rear fog lamp bulb, a damaged or corroded connector, broken wiring, or a malfunctioning fog lamp control switch.

4. How can I diagnose the B1664 code on my Dodge?

Start by inspecting the rear fog lamp bulb, connectors, and wiring for damage or corrosion. Use a multimeter to check for proper voltage in the circuit.

5. Can a blown fuse trigger the B1664 code?

While a blown fuse is less likely to cause this specific code, it is worth checking the fuse related to the rear fog lamp circuit as part of the diagnostic process.

6. How do I fix the B1664 code on my Dodge?

Repairs may include replacing the rear fog lamp bulb, repairing damaged wiring, cleaning corroded connectors, or replacing a faulty control switch if necessary.

7. Is it safe to drive with the B1664 code active?

Yes, it is generally safe to drive, but the rear fog lamp may not function properly, which could reduce visibility in foggy or low-visibility conditions.

8. Can a bad rear fog lamp bulb cause the B1664 code?

Yes, a faulty or burned-out bulb can cause the circuit to malfunction, triggering the code.

9. How much does it cost to fix the B1664 code on a Dodge?

The cost depends on the cause of the issue. Replacing a bulb is inexpensive, but repairing wiring or replacing the control switch may be more costly.

10. Can clearing the B1664 code fix the issue permanently?

Clearing the code will only reset the warning temporarily. The underlying issue must be addressed to prevent the code from returning.

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