AutoCodes – Dodge – B1E21 Dodge

B1E21 Dodge Code - Backup Battery Circuit Voltage Below Threshold

Quick Answer

The Emergency Assistance Module (EAM) monitors the Backup Battery Circuit. Common causes include Faulty Backup Battery, Backup Battery harness is open or shorted, Backup Battery 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: B1E21 Dodge indicates Backup Battery Circuit Voltage Below Threshold.
Common causes: Common causes include Faulty Backup Battery, Backup Battery harness is open or shorted, Backup Battery 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 1,027

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 03, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1E21 Dodge Description

The Emergency Assistance Module (EAM) monitors the Backup Battery Circuit. The EAM sets the OBDII code when it detects a low backup battery.

OBDII Code B1E21 Dodge - Backup Battery Circuit Voltage Below Threshold - AutoCodes.com — B1E21 Dodge Code - Backup Battery Circuit Voltage Below Threshold

What does this mean?

What are the Possible Causes of the DTC B1E21 Dodge?

Faulty Backup Battery
Backup Battery harness is open or shorted
Backup Battery circuit poor electrical connection
Faulty Emergency Assistance Module (EAM)

How to Fix the DTC B1E21 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 B1E21 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 B1E21 Dodge Code

1. What does the OBDII code B1E21 mean on a Dodge vehicle?

The B1E21 code indicates that the backup battery circuit voltage has dropped below the specified threshold, which could affect certain electrical systems.

2. What are the common symptoms of the B1E21 code?

Common symptoms include warning lights on the dashboard, issues with backup power systems, or malfunctions in auxiliary electrical components.

3. What causes the B1E21 code to appear on a Dodge vehicle?

This code can be caused by a depleted backup battery, loose or corroded connections, a failed backup battery module, or damaged wiring in the circuit.

4. Can a low main battery voltage trigger the B1E21 code?

No, the B1E21 code specifically relates to the backup battery circuit voltage, separate from the main vehicle battery.

5. How do you diagnose the B1E21 code?

Diagnosis involves checking the backup battery's voltage, inspecting wiring and connections for damage or corrosion, and testing the backup battery module for proper operation.

6. Can I drive my Dodge with the B1E21 code active?

Driving is usually possible, but certain electrical systems may not function correctly, potentially affecting safety or convenience features.

7. How do you fix the B1E21 code on a Dodge vehicle?

Fixes may include replacing the backup battery, repairing or replacing damaged wiring, cleaning corroded connections, or replacing the backup battery module if faulty.

8. Is the B1E21 code specific to Dodge vehicles?

While the code format is standard, the B1E21 code and its description are specific to Dodge and other Chrysler-family vehicles.

9. How much does it cost to repair the B1E21 code on a Dodge?

The repair cost depends on the exact issue but typically ranges from $50 for simple wiring repairs to $300 or more for a new backup battery module.

10. How can I prevent the B1E21 code from occurring?

Regular maintenance, such as checking battery connections for corrosion and ensuring the backup battery is in good condition, can help prevent this code.