AutoCodes – Dodge – B2124 Dodge

B2124 Dodge Code - Ignition Run Control Circuit Open

Quick Answer

The Front Control Module monitors the Ignition Run Control Circuit. Common causes include Faulty Run Relay, Run Relay harness is open or shorted, Run Relay circuit poor electrical connection. 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: B2124 Dodge indicates Ignition Run Control Circuit Open.
Common causes: Common causes include Faulty Run Relay, Run Relay harness is open or shorted, Run Relay circuit poor electrical connection.
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.

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Code Popularity 3,595

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 19, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2124 Dodge Description

The Front Control Module monitors the Ignition Run Control Circuit. The Front Control Module will set this DTC within 500ms if the run relay control circuit voltage is open or shorted to ground.

OBDII Code B2124 Dodge - Ignition Run Control Circuit Open - AutoCodes.com — B2124 Dodge Code - Ignition Run Control Circuit Open

What does this mean?

What are the Possible Causes of the DTC B2124 Dodge?

Faulty Run Relay
Run Relay harness is open or shorted
Run Relay circuit poor electrical connection
Faulty Front Control Module (FCM)

How to Fix the DTC B2124 Dodge?

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 B2124 Dodge 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 B2124 Dodge Code

1. What are the common symptoms of OBDII code B2124 in a Dodge related to the Ignition Run Control Circuit Open?

- Common symptoms include difficulty starting the vehicle, engine stalling, and potential loss of power while driving.

2. What are the possible causes of the Ignition Run Control Circuit Open code B2124 in a Dodge?

- The code may be triggered by a faulty ignition switch, damaged wiring in the ignition circuit, or a malfunctioning ignition run relay.

3. How can I diagnose the Ignition Run Control Circuit Open issue in my Dodge when OBDII code B2124 is present?

- Using a multimeter, you can test the continuity of the ignition circuit, check for loose or damaged wiring, and inspect the ignition switch for proper functionality.

4. Can a DIY enthusiast repair the Ignition Run Control Circuit Open problem causing OBDII code B2124 in a Dodge?

- Depending on the root cause, DIY repairs may be feasible, such as replacing a faulty ignition switch or repairing damaged wiring. However, complex issues may require professional assistance.

5. Is it safe to continue driving my Dodge with OBDII code B2124 related to the Ignition Run Control Circuit Open?

- It is not recommended to drive the vehicle with this code present, as it can lead to sudden stalling or loss of engine power, posing a safety risk.

6. How much can I expect to pay for repairing the Ignition Run Control Circuit Open issue triggering OBDII code B2124 in a Dodge?

- Repair costs can vary depending on the cause of the problem and labor rates, but expect to pay anywhere from $100 to $400 for parts and labor.

7. Are there any preventive measures to avoid encountering the Ignition Run Control Circuit Open code B2124 in a Dodge?

- Regularly inspecting the ignition system, promptly addressing any starting or power issues, and maintaining the electrical components can help prevent this code from appearing.

8. Can a weak battery or alternator cause the OBDII code B2124 related to the Ignition Run Control Circuit Open in a Dodge?

- Yes, a weak battery or alternator can lead to voltage fluctuations in the ignition system, potentially triggering the B2124 code. It's recommended to ensure the battery and charging system are in good condition.

9. Will disconnecting the battery reset the OBDII code B2124 linked to the Ignition Run Control Circuit Open in a Dodge?

- Disconnecting the battery may temporarily clear the code, but it's important to address the underlying issue causing the code to prevent it from reoccurring.

10. Can extreme weather conditions, such as extreme cold or heat, contribute to the appearance of OBDII code B2124 due to the Ignition Run Control Circuit Open in a Dodge?

- Yes, extreme temperatures can impact the electrical components in the ignition system, potentially leading to issues that trigger the B2124 code.