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Engine-Codes – RAM – B2104 RAM

B2104 RAM Code - Ignition Unlock Run/Start Control Circuit Low

Quick Answer

The B2104 RAM code refers to an issue with the Ignition Unlock Run/Start Control Circuit being detected as low. Common causes include Faulty ignition switch, Wiring issues in the ignition circuit, Defective ignition lock cylinder. 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
B2104 RAM indicates Ignition Unlock Run/Start Control Circuit Low.
Common causes
Common causes include Faulty ignition switch, Wiring issues in the ignition circuit, Defective ignition lock cylinder.
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 B2104 RAM Description

The B2104 RAM code refers to an issue with the Ignition Unlock Run/Start Control Circuit being detected as low. This circuit is responsible for controlling the ignition system and allowing the vehicle to start and run. When this circuit is not functioning properly, it can prevent the vehicle from starting or cause it to stall while driving. The low voltage detected in this circuit indicates a problem with the electrical connection or components involved in the ignition system.

OBDII Code B2104 RAM - Ignition Unlock Run/Start Control Circuit Low
B2104 RAM Code - Ignition Unlock Run/Start Control Circuit Low

Common Causes of B2104 RAM

  1. Faulty ignition switch
  2. Wiring issues in the ignition circuit
  3. Defective ignition lock cylinder
  4. Faulty ignition relay
  5. Malfunctioning ignition control module

Symptoms of B2104 RAM

  1. Engine cranks but does not start
  2. Intermittent stalling while driving
  3. Difficulty turning the key in the ignition
  4. Illumination of the Check Engine Light
  5. Loss of power while driving

How to Fix B2104 RAM

  1. Begin by checking the wiring and connections in the ignition circuit for any signs of damage or corrosion. Repair or replace any damaged wires or connectors.
  2. Test the ignition switch for proper functionality using a multimeter. Replace the ignition switch if it is found to be faulty.
  3. Inspect the ignition lock cylinder for any signs of wear or damage. Replace the lock cylinder if necessary.
  4. Check the ignition relay and ignition control module for proper operation. Replace any components that are found to be defective.
  5. Clear the diagnostic trouble codes from the vehicle's computer using a scan tool, and test the vehicle to ensure that the issue has been resolved.

Cost to Fix B2104 RAM

The cost of repairing the B2104 RAM code can vary depending on the specific cause of the issue and the labor rates in your area. On average, the repair for this code can range from $100 to $300 for parts and labor. It's important to note that diagnostic time and labor rates at auto repair shops can vary, so it's recommended to get a few quotes from different shops to ensure you're getting a fair price.

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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 B2104 RAM Code

1. What does the OBDII code B2104 mean on a RAM vehicle?

The B2104 code indicates an issue with the Ignition Unlock Run/Start Control Circuit being in a low voltage condition.

2. What are common symptoms of the B2104 code in a RAM?

Symptoms may include difficulty starting the vehicle, unresponsive ignition switch, or the inability to turn the key to certain positions.

3. What causes the B2104 code to appear?

Common causes include a faulty ignition switch, damaged wiring or connectors in the ignition circuit, or a malfunctioning ignition relay.

4. How do I diagnose the B2104 code on a RAM?

Start by inspecting the ignition switch, wiring, and related connectors for damage or corrosion. Use a multimeter to check for proper voltage in the circuit.

5. Can I drive my RAM with the B2104 code present?

Driving may be possible, but the ignition system could fail completely, leaving you stranded. It’s best to address the issue promptly.

6. How do I fix the B2104 code in my RAM?

Repairs may include replacing the ignition switch, repairing damaged wiring, or replacing the ignition relay if found faulty.

7. How much does it cost to fix the B2104 code on a RAM?

Repair costs vary, but replacing an ignition switch typically ranges from $150 to $300, depending on parts and labor.

8. Can a weak battery cause the B2104 code?

Yes, a weak or failing battery can cause voltage issues in the ignition circuit, potentially triggering the B2104 code.

9. Will clearing the B2104 code fix the problem?

Clearing the code may temporarily turn off the warning, but the underlying issue must be fixed to prevent the code from returning.

10. Do I need a professional to fix the B2104 code on my RAM?

While some repairs like checking wiring can be done by a skilled DIYer, diagnosing and fixing ignition system issues may require professional tools and expertise.

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