AutoCodes – BMW – U0401 BMW

U0401 BMW Code - Invalid Data Received From ECM/PCM

Quick Answer

This diagnostic checks the validity of the two Control Area Network (CAN) messages sent by the Powertrain Control Module (PCM) containing information about the engine torque. Common causes include Faulty Powertrain Control Module (PCM), Powertrain Control Module (PCM) harness is open or shorted, Powertrain Control Module (PCM) 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: U0401 BMW indicates Invalid Data Received From ECM/PCM.
Common causes: Common causes include Faulty Powertrain Control Module (PCM), Powertrain Control Module (PCM) harness is open or shorted, Powertrain Control Module (PCM) 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 4,248

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 Apr 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0401 BMW Description

This diagnostic checks the validity of the two Control Area Network (CAN) messages sent by the Powertrain Control Module (PCM) containing information about the engine torque. The diagnostic checks the validity by performing a CRC and message counter check be sure the CAN messages are continuously updated by the PCM and they contain valid values.

OBDII Code U0401 BMW - Invalid Data Received From ECM/PCM - AutoCodes.com — U0401 BMW Code - Invalid Data Received From ECM/PCM

What does this mean?

What are the Possible Causes of the DTC U0401 BMW?

Faulty Powertrain Control Module (PCM)
Powertrain Control Module (PCM) harness is open or shorted
Powertrain Control Module (PCM) circuit poor electrical connection
Faulty Transmission Control Module (TCM)

How to Fix the DTC U0401 BMW?

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 U0401 BMW 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 U0401 BMW code?

Need more information on how to fix the U0401 BMW code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0401 BMW 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 U0401 BMW Code

1. What are the common symptoms of OBDII code U0401 in a BMW?

- Common symptoms include engine stalling, rough idling, reduced fuel efficiency, and the illumination of the check engine light.

2. What does the OBDII code U0401 in a BMW mean?

- The code U0401 indicates that the engine control module (ECM) or powertrain control module (PCM) has detected invalid data communication from another module.

3. What are the possible causes of the U0401 code in a BMW?

- Possible causes include a faulty ECM/PCM, issues with the communication network, damaged wiring or connectors, software glitches, or a malfunctioning sensor.

4. How can I diagnose the U0401 code in my BMW?

- Diagnosing the U0401 code typically involves using a diagnostic scanner to retrieve the error code, checking for other related codes, inspecting the wiring and connectors, and testing the communication network.

5. Can I still drive my BMW with the U0401 code present?

- It is not recommended to drive your BMW with the U0401 code present, as it can lead to further damage and potentially unsafe driving conditions. It is best to address the issue promptly.

6. How can I repair the U0401 code in my BMW?

- Repairing the U0401 code may involve resetting the code and clearing the error memory, repairing or replacing damaged wiring or connectors, updating software, or replacing the ECM/PCM if necessary.

7. Will the U0401 code reset itself in my BMW?

- The U0401 code may reset itself if the underlying issue is intermittent. However, it is recommended to diagnose and repair the problem to prevent further occurrences.

8. Can a DIY enthusiast fix the U0401 code in a BMW?

- Depending on the cause of the U0401 code, some DIY enthusiasts may be able to address the issue by checking and repairing wiring connections. However, more complex issues may require professional assistance.

9. How much does it cost to repair the U0401 code in a BMW?

- The cost of repairing the U0401 code in a BMW can vary depending on the cause of the issue, the extent of the repair needed, and whether any parts need to be replaced. It is recommended to obtain quotes from professionals.

10. Is the U0401 code a common issue in BMW vehicles?

- The U0401 code is not extremely common in BMW vehicles, but it can occur due to various factors such as electrical problems, communication errors, or module failures.