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Engine-Codes – Dodge – B2104 Dodge

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

Quick Answer

The B2104 diagnostic trouble code for Dodge vehicles refers to the Ignition Unlock Run/Start Control Circuit Low. Common causes include Damaged wiring in the ignition lock circuit, Faulty ignition lock cylinder, Malfunctioning ignition switch. 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 Dodge indicates Ignition Unlock Run/Start Control Circuit Low.
Common causes
Common causes include Damaged wiring in the ignition lock circuit, Faulty ignition lock cylinder, Malfunctioning ignition switch.
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 08, 2024
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Code B2104 Dodge Description

The B2104 diagnostic trouble code for Dodge vehicles refers to the Ignition Unlock Run/Start Control Circuit Low. This code indicates that there is a low voltage condition in the circuit that controls the ignition lock feature of the vehicle. The ignition lock feature is responsible for unlocking the steering wheel and allowing the vehicle to start when the key is turned.

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

Common Causes of B2104 Dodge

  1. Damaged wiring in the ignition lock circuit
  2. Faulty ignition lock cylinder
  3. Malfunctioning ignition switch
  4. Issues with the body control module
  5. Loose connections or corrosion in the circuit

Symptoms of B2104 Dodge

  1. Difficulty starting the vehicle
  2. Steering wheel locking up
  3. Engine stalling while driving
  4. Dashboard warning lights related to the ignition system

How to Fix B2104 Dodge

  1. Perform a visual inspection of the wiring and connections in the ignition lock circuit.
  2. Test the ignition lock cylinder and ignition switch for proper operation.
  3. Check the body control module for any faults or errors.
  4. Repair or replace any damaged wiring or components in the circuit.
  5. Clear the diagnostic trouble codes and test the vehicle to ensure the issue has been resolved.

Cost to Fix B2104 Dodge

The cost of repairing the B2104 code for a Dodge vehicle can vary depending on the specific underlying issue and the labor rates in your area. On average, you can expect to pay anywhere from $100 to $300 for parts and labor. Keep in mind 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 compare prices. Additionally, rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more competitive pricing.

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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 Dodge Code

1. What does the OBD-II code B2104 mean in a Dodge vehicle?

The B2104 code indicates a problem with the Ignition Unlock Run/Start Control Circuit, specifically a low voltage condition.

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

Symptoms may include difficulty starting the vehicle, the ignition not unlocking, or electrical components failing to power up in the "Run" or "Start" position.

3. What causes the B2104 code to appear?

Common causes include a faulty ignition switch, damaged wiring or connectors in the circuit, or a malfunctioning Powertrain Control Module (PCM).

4. How can you diagnose the B2104 code?

Diagnosis involves checking the ignition switch, inspecting wiring and connectors for damage or corrosion, and using a multimeter to test circuit voltage.

5. Can a drained battery cause the B2104 code to trigger?

Yes, a low or drained battery can lead to insufficient voltage in the ignition circuit, potentially triggering the code.

6. How do you fix the B2104 code on a Dodge?

Repairs may include replacing the ignition switch, repairing damaged wiring or connectors, or reprogramming or replacing the PCM if necessary.

7. Is it safe to drive with the B2104 code active?

Driving with this code may cause intermittent starting issues or other electrical problems, so it’s best to address it promptly.

8. Does clearing the B2104 code fix the problem permanently?

Clearing the code erases it temporarily, but the underlying issue must be repaired to prevent the code from returning.

9. Can a blown fuse cause the B2104 code?

Yes, a blown fuse in the ignition circuit can result in low voltage and trigger the code.

10. Is professional help required to resolve the B2104 code?

While some repairs, like replacing a blown fuse, can be done by a DIYer, complex issues like PCM faults or extensive wiring damage may require professional assistance.

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