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Engine-Codes – RAM – B1644 RAM

B1644 RAM Code - Rear Left Turn Control Circuit High

Quick Answer

The B1644 diagnostic trouble code (DTC) indicates a problem with the rear left turn control circuit being too high. Common causes include Faulty wiring harness, Short circuit in the circuitry, Malfunctioning BCM. 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
B1644 RAM indicates Rear Left Turn Control Circuit High.
Common causes
Common causes include Faulty wiring harness, Short circuit in the circuitry, Malfunctioning BCM.
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 17, 2024
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Code B1644 RAM Description

The B1644 diagnostic trouble code (DTC) indicates a problem with the rear left turn control circuit being too high. This code is typically found in vehicles equipped with a body control module (BCM) that controls various lighting functions, including turn signals. When the BCM detects that the voltage in the rear left turn control circuit is higher than expected, it triggers the B1644 code and illuminates the check engine light on the dashboard.

OBDII Code B1644 RAM - Rear Left Turn Control Circuit High
B1644 RAM Code - Rear Left Turn Control Circuit High

Common Causes of B1644 RAM

  1. Faulty wiring harness
  2. Short circuit in the circuitry
  3. Malfunctioning BCM
  4. Defective turn signal switch
  5. Corrosion or damage to electrical connectors

Symptoms of B1644 RAM

  1. Rear left turn signal not working
  2. Rapid blinking of the rear left turn signal
  3. Check engine light illuminated on the dashboard
  4. Rear left turn signal staying on constantly
  5. Dim or flickering rear left turn signal

How to Fix B1644 RAM

  1. Begin by conducting a thorough visual inspection of the rear left turn control circuit, looking for any visible damage, corrosion, or loose connections.
  2. Use a multimeter to test the voltage in the circuit and compare it to the manufacturer's specifications to determine if it is too high.
  3. Check the wiring harness for any signs of wear or damage, replacing any faulty wiring as needed.
  4. Test the BCM and turn signal switch for proper functionality, replacing them if they are found to be defective.
  5. Clear the DTC from the vehicle's memory using a scan tool after completing the repairs to reset the system and ensure the issue has been resolved.

Cost to Fix B1644 RAM

The typical repair costs for addressing a B1644 code can vary depending on the specific cause of the issue. In general, parts such as a new wiring harness, BCM, or turn signal switch can range from $100 to $500, while labor costs can add an additional $100 to $300. Overall, the total repair cost for this issue can range from $200 to $800. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate.

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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 B1644 RAM Code

1. What are the common symptoms of OBDII code B1644 RAM - Rear Left Turn Control Circuit High?

- Common symptoms include the rear left turn signal not working, fast blinking turn signal indicator, or a warning light on the dashboard.

2. What are the possible causes of OBDII code B1644 RAM - Rear Left Turn Control Circuit High?

- The code can be triggered by issues such as a faulty turn signal bulb, damaged wiring or connectors, a defective turn signal switch, or a problem with the body control module.

3. How can I diagnose the cause of OBDII code B1644 RAM - Rear Left Turn Control Circuit High?

- To diagnose the issue, you can start by inspecting the rear left turn signal bulb, checking the wiring and connectors for damage, testing the turn signal switch, and using a diagnostic scanner to read the code and pinpoint the exact problem.

4. Can I drive my vehicle with OBDII code B1644 RAM - Rear Left Turn Control Circuit High?

- It is not recommended to drive the vehicle with this code active, as it can affect the turn signal operation and compromise safety on the road. It is best to address the issue promptly.

5. How can I repair OBDII code B1644 RAM - Rear Left Turn Control Circuit High?

- Repair options may include replacing the faulty turn signal bulb, repairing or replacing damaged wiring or connectors, fixing the turn signal switch, or reprogramming the body control module if necessary.

6. Is OBDII code B1644 RAM - Rear Left Turn Control Circuit High a serious issue?

- While it may not affect the drivability of the vehicle, it is still important to address this code promptly to ensure the proper functioning of the turn signal system and maintain road safety.

7. Can a DIY enthusiast fix OBDII code B1644 RAM - Rear Left Turn Control Circuit High?

- Depending on your experience and tools available, some DIY enthusiasts may be able to address this code by following repair guides and using basic diagnostic equipment. However, more complex issues may require professional assistance.

8. How much does it typically cost to fix OBDII code B1644 RAM - Rear Left Turn Control Circuit High?

- The cost of fixing this code can vary depending on the specific cause of the issue, labor rates in your area, and whether you choose OEM or aftermarket parts. It's advisable to get a few quotes from mechanics to compare prices.

9. Can extreme weather conditions cause OBDII code B1644 RAM - Rear Left Turn Control Circuit High?

- Extreme weather conditions, such as water damage from heavy rain or snow, can potentially cause electrical issues that lead to this code. It's important to protect your vehicle from such conditions and address any damage promptly.

10. How often does OBDII code B1644 RAM - Rear Left Turn Control Circuit High occur in vehicles?

- The occurrence of this code can vary depending on the age and condition of the vehicle, as well as maintenance history. It is not one of the most common OBDII codes, but it can still happen due to various factors.

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