AutoCodes – RAM – B2120 RAM

B2120 RAM Code - Ignition Run/Acc/Pad Control Circuit Open

Quick Answer

The Front Control Module monitors the Ignition Run/ACC/Pad Control Circuit. Common causes include Faulty Accessory Delay Relay, Accessory Delay Relay harness is open or shorted, Accessory Delay 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: B2120 RAM indicates Ignition Run/Acc/Pad Control Circuit Open.
Common causes: Common causes include Faulty Accessory Delay Relay, Accessory Delay Relay harness is open or shorted, Accessory Delay 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 876

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 B2120 RAM Description

The Front Control Module monitors the Ignition Run/ACC/Pad Control Circuit. The Front Control Module will set this Diagnostic Trouble Code (DTC) within 500ms if the Ignition Accessory Delay Relay Control circuit is open.

OBDII Code B2120 RAM - Ignition Run/Acc/Pad Control Circuit Open - AutoCodes.com — B2120 RAM Code - Ignition Run/Acc/Pad Control Circuit Open

What does this mean?

What are the Possible Causes of the DTC B2120 RAM?

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

How to Fix the DTC B2120 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 B2120 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 B2120 RAM Code

1. What are common symptoms of OBDII code B2120 RAM Ignition Run/Acc/Pad Control Circuit Open?

- Common symptoms include issues with starting the vehicle, loss of power in key-operated systems, and potential engine stalling.

2. What can cause the OBDII code B2120 RAM Ignition Run/Acc/Pad Control Circuit Open?

- The code can be caused by a malfunction in the ignition run/acc/pad control circuit, a faulty ignition switch, damaged wiring, or a bad connection in the circuit.

3. How do I diagnose the OBDII code B2120 RAM Ignition Run/Acc/Pad Control Circuit Open?

- Diagnosis involves using an OBDII scanner to read the code, checking the wiring and connections in the ignition circuit, and testing the ignition switch for proper functionality.

4. Can I still drive my vehicle with the OBDII code B2120 RAM Ignition Run/Acc/Pad Control Circuit Open?

- It is not recommended to drive the vehicle with this code, as it can lead to potential safety issues like engine stalling or loss of key-operated functions while driving.

5. How do I repair the OBDII code B2120 RAM Ignition Run/Acc/Pad Control Circuit Open?

- Repair usually involves fixing the malfunction in the ignition circuit, replacing the faulty ignition switch, repairing damaged wiring, or ensuring proper connections in the circuit.

6. Will resetting the OBDII code B2120 RAM Ignition Run/Acc/Pad Control Circuit Open fix the issue?

- Resetting the code may temporarily clear the error, but if the underlying issue is not addressed, the code is likely to reappear once the problem is detected again.

7. Can a DIY enthusiast fix the OBDII code B2120 RAM Ignition Run/Acc/Pad Control Circuit Open?

- Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to diagnose and repair this code. However, it is recommended to seek professional help if unsure.

8. Is the OBDII code B2120 RAM Ignition Run/Acc/Pad Control Circuit Open a serious problem?

- Yes, this code should be addressed promptly as it can lead to potential safety hazards and operational issues with the vehicle.

9. How long does it typically take to repair the OBDII code B2120 RAM Ignition Run/Acc/Pad Control Circuit Open?

- The repair time can vary depending on the exact cause of the code, but it usually takes a few hours to diagnose and fix the issue.

10. Can weather conditions or environmental factors trigger the OBDII code B2120 RAM Ignition Run/Acc/Pad Control Circuit Open?

- Extreme weather conditions or exposure to moisture can potentially contribute to issues in the ignition circuit, leading to the triggering of this code.