AutoCodes – Chrysler – B21A1 Chrysler

B21A1 Chrysler Code - ECU Reset/Recovery Occurred

Quick Answer

Whenever the module detects a power on reset or a re-flash, this code will set. Common causes include Module Was Reset, Module Was Re-Flashed. 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: B21A1 Chrysler indicates ECU Reset/Recovery Occurred.
Common causes: Common causes include Module Was Reset, Module Was Re-Flashed.
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 12,575

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 30, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B21A1 Chrysler Description

Whenever the module detects a power on reset or a re-flash, this code will set. This code is for information only. No repair is necessary.

OBDII Code B21A1 Chrysler - ECU Reset/Recovery Occurred - AutoCodes.com — B21A1 Chrysler Code - ECU Reset/Recovery Occurred

What does this mean?

What are the Possible Causes of the DTC B21A1 Chrysler?

Module Was Reset
Module Was Re-Flashed

How to Fix the DTC B21A1 Chrysler?

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 B21A1 Chrysler 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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Need Help with the Code?

Get the B21A1 Chrysler code diagnosed by a professional: Find a repair shop in your area

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 B21A1 Chrysler Code

1. What does the OBDII code B21A1 Chrysler mean?

The code B21A1 indicates that an Electronic Control Unit (ECU) reset or recovery event has occurred in a Chrysler vehicle.

2. What are the common symptoms of ECU reset/recovery in a Chrysler vehicle?

Common symptoms include the engine stalling, rough idling, poor acceleration, and in some cases, the vehicle not starting at all.

3. What can cause the ECU reset/recovery event in a Chrysler vehicle?

The ECU reset/recovery event can be triggered by a power interruption, a faulty ECU, a software glitch, or issues with the vehicle's electrical system.

4. How can I diagnose the ECU reset/recovery issue in my Chrysler vehicle?

To diagnose the issue, you can use an OBDII scanner to retrieve the B21A1 code and check for any related codes. It's also recommended to inspect the vehicle's electrical connections and the ECU itself.

5. Is it safe to continue driving my Chrysler vehicle with the ECU reset/recovery issue?

It is not recommended to drive the vehicle with the ECU reset/recovery issue, as it can lead to further damage and potential safety hazards. It's best to address the issue promptly.

6. How can I reset the ECU in my Chrysler vehicle to clear the B21A1 code?

You can try resetting the ECU by disconnecting the vehicle's battery for a few minutes and then reconnecting it. This may clear the code, but it's important to address the underlying issue causing the ECU reset/recovery event.

7. Can a DIY enthusiast repair the ECU reset/recovery issue in a Chrysler vehicle?

While some simple troubleshooting steps like checking connections and resetting the ECU can be done by DIY enthusiasts, more complex issues may require professional diagnosis and repair.

8. Will the ECU reset/recovery event affect my Chrysler vehicle's performance?

Yes, the ECU reset/recovery event can impact your vehicle's performance by causing drivability issues such as poor fuel efficiency, rough idling, and difficulty starting.

9. How much does it typically cost to repair the ECU reset/recovery issue in a Chrysler vehicle?

The cost of repairing the ECU reset/recovery issue can vary depending on the underlying cause. Simple fixes like checking connections may be low-cost, while repairing or replacing the ECU can be more expensive.

10. How can I prevent the ECU reset/recovery issue from occurring in my Chrysler vehicle in the future?

To prevent ECU reset/recovery issues, it's important to maintain your vehicle's electrical system, avoid power surges, and address any warning signs promptly to prevent further issues. Regular vehicle maintenance can also help prevent such issues from occurring.