AutoCodes – Generic – B2122

B2122 Code - Ignition Run Control Circuit Low

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: B2122 indicates Ignition Run Control Circuit Low.
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 9,025

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 17, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2122 Description

The Front Control Module monitors the Ignition Run Control Circuit. The Front Control Module will set this Diagnostic Trouble Code (DTC) within 500ms if the Run Relay Control Circuit voltage is open or shorted to ground.

OBDII Code B2122 - Ignition Run Control Circuit Low - AutoCodes.com — B2122 Code - Ignition Run Control Circuit Low

What does this mean?

What are the Possible Causes of the DTC B2122?

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 B2122?

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 B2122 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.

Need more information about the B2122 code?

Need more information on how to fix the B2122 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2122 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B2122 Chrysler — Ignition Run Control Circuit Low
B2122 Dodge — Ignition Run Control Circuit Low
B2122 Jeep — Ignition Run Control Circuit Low
B2122 RAM — Ignition Run Control Circuit Low

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 B2122 Code

1. What are the common symptoms of OBDII code B2122 (Ignition Run Control Circuit Low)?

The common symptoms of code B2122 include difficulty starting the vehicle, engine stalling, and issues with the ignition system.

2. What are the possible causes of OBDII code B2122?

The possible causes of code B2122 include a faulty ignition switch, damaged wiring or connectors in the ignition system, or a malfunctioning ignition run control circuit.

3. How do I diagnose OBDII code B2122?

Diagnosing code B2122 involves using a scan tool to retrieve the code, inspecting the ignition system components, checking wiring for damage, and testing the ignition switch for proper functionality.

4. Can a DIYer repair OBDII code B2122?

While some DIYers may be able to repair code B2122 by replacing a faulty ignition switch or repairing damaged wiring, it is recommended to consult a professional mechanic for accurate diagnosis and repair.

5. What are some tips for repairing OBDII code B2122?

Tips for repairing code B2122 include ensuring all wiring and connectors in the ignition system are in good condition, replacing the ignition switch if necessary, and clearing the code after repairs are completed.

6. Is it safe to continue driving with OBDII code B2122 present?

It is not recommended to continue driving with OBDII code B2122 present, as it can lead to potential issues with starting the vehicle or engine stalling while driving.

7. How much does it typically cost to repair OBDII code B2122?

The cost to repair code B2122 can vary depending on the underlying cause of the issue, but it may range from $100 to $300 for parts and labor.

8. Can OBDII code B2122 cause damage to other vehicle components if left untreated?

While code B2122 itself may not cause direct damage to other components, ignoring the issue can lead to further problems with the ignition system and potentially impact the vehicle's overall performance.

9. How long does it take to repair OBDII code B2122?

The time to repair code B2122 can vary based on the complexity of the issue and the availability of parts, but it typically takes a few hours to a day for a professional mechanic to diagnose and fix the problem.

10. Will resetting the OBDII system clear code B2122?

Resetting the OBDII system may temporarily clear code B2122, but if the underlying issue is not addressed and fixed, the code is likely to reappear. It's important to diagnose and repair the root cause of the problem.