AutoCodes – RAM – B104D RAM

B104D RAM Code - Blend Door Control Circuit Low

Quick Answer

The Powertrain Control Module (PCM) factors the Blend Door position and Blower Motor speed information into the coolant temperature modeling. Common causes include Faulty Blend Door Actuator, Blend Door Actuator harness is open or shorted, Blend Door Actuator circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: B104D RAM indicates Blend Door Control Circuit Low.
Common causes: Common causes include Faulty Blend Door Actuator, Blend Door Actuator harness is open or shorted, Blend Door Actuator circuit poor electrical connection.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 2,035

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 11, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B104D RAM Description

The Powertrain Control Module (PCM) factors the Blend Door position and Blower Motor speed information into the coolant temperature modeling. This information is received as a raw voltage signal from the Heating, Ventilation, & Air Conditioning (HVAC) Module over the Can Bus.

OBDII Code B104D RAM - Blend Door Control Circuit Low - AutoCodes.com — B104D RAM Code - Blend Door Control Circuit Low

What does this mean?

What are the Possible Causes of the DTC B104D RAM?

Faulty Blend Door Actuator
Blend Door Actuator harness is open or shorted
Blend Door Actuator circuit poor electrical connection
Faulty Heating, Ventilation, & Air Conditioning (HVAC) Module

How to Fix the DTC B104D 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 B104D 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.

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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 B104D RAM Code

1. What are the common symptoms of OBDII code B104D RAM (Blend Door Control Circuit Low)?

- Common symptoms include lack of temperature control in the cabin, heater or AC not working properly, and unusual clicking noises from the HVAC system.

2. What can cause the OBDII code B104D RAM to set?

- The code can be set due to a malfunction in the blend door actuator, damaged wiring in the blend door circuit, or a faulty HVAC control module.

3. How can I diagnose the cause of the B104D RAM code?

- Diagnose by checking the blend door actuator for proper operation, inspecting the wiring for any damage or corrosion, and testing the HVAC control module for faults using a scan tool.

4. What are some repair tips for fixing the Blend Door Control Circuit Low issue?

- Repair tips include replacing the blend door actuator if faulty, repairing any damaged wiring in the circuit, and resetting the HVAC control module after repairs are completed.

5. Can I drive my vehicle with the B104D RAM code active?

- It is generally safe to drive the vehicle with this code, but you may experience discomfort due to the lack of proper temperature control in the cabin.

6. How much does it cost to repair the Blend Door Control Circuit Low issue?

- The cost of repair can vary depending on the cause of the issue, but it may range from $100 to $300 for parts and labor.

7. Can I reset the B104D RAM code without fixing the underlying issue?

- While you can clear the code using a scan tool, it is recommended to fix the underlying issue to prevent further HVAC system problems.

8. Is the B104D RAM code a common issue in certain vehicle models?

- The B104D RAM code is more commonly seen in certain Dodge, Chrysler, and Jeep vehicles with HVAC system blend door control circuits.

9. Will replacing the blend door actuator solve the B104D RAM problem?

- Replacing the blend door actuator is a common fix for this code, but it is important to diagnose the issue correctly to ensure a proper repair.

10. How long does it take to repair the Blend Door Control Circuit Low issue?

- The repair time can vary based on the specific cause of the issue, but it typically takes 1-2 hours for a professional mechanic to diagnose and repair the problem.