AutoCodes – BMW – P1720 BMW

P1720 BMW Code - CAN Timeout Control Module

Quick Answer

The Diagnostic Trouble Code (DTC) will set when the Engine Control Module (ECM) fails to communicate with another Control Module through the Controller Area Network (CAN) system. Common causes include Faulty Controller Area Network (CAN), Engine Control Module (ECM) harness is open or shorted, Engine Control Module (ECM) 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: P1720 BMW indicates CAN Timeout Control Module.
Common causes: Common causes include Faulty Controller Area Network (CAN), Engine Control Module (ECM) harness is open or shorted, Engine Control Module (ECM) 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 8,534

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 Mar 11, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1720 BMW Description

The Diagnostic Trouble Code (DTC) will set when the Engine Control Module (ECM) fails to communicate with another Control Module through the Controller Area Network (CAN) system.

OBDII Code P1720 BMW - CAN Timeout Control Module - AutoCodes.com — P1720 BMW Code - CAN Timeout Control Module

What does this mean?

What are the Possible Causes of the DTC P1720 BMW?

Faulty Controller Area Network (CAN)
Engine Control Module (ECM) harness is open or shorted
Engine Control Module (ECM) circuit poor electrical connection

How to Fix the DTC P1720 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 P1720 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 P1720 BMW code?

Need more information on how to fix the P1720 BMW code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1720 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 P1720 BMW Code

1. What are the common symptoms of OBDII code P1720 in a BMW related to CAN Timeout Control Module?

The common symptoms include illumination of the Check Engine Light, transmission shifting issues, and possibly a limp mode where the vehicle operates in a reduced power state.

2. What are the possible causes of OBDII code P1720 in a BMW?

Potential causes of this code include faulty wiring or connectors in the CAN bus system, a defective control module, a software issue, or a problem with the vehicle's network communication.

3. How can I diagnose the OBDII code P1720 in a BMW related to the CAN Timeout Control Module?

Diagnosis typically involves using a diagnostic scanner to retrieve the specific fault code, checking the wiring and connectors in the CAN bus system, testing the control module, and ensuring proper communication between various vehicle modules.

4. Are there any quick repair tips for fixing OBDII code P1720 in a BMW?

Quick repair tips may include checking and repairing any damaged wiring or connectors in the CAN bus system, resetting the control module, and updating the vehicle's software if necessary.

5. Is it safe to continue driving with OBDII code P1720 in a BMW related to the CAN Timeout Control Module?

It is generally not recommended to continue driving with this code present, as it can lead to further transmission issues or potential damage. It's best to address the problem promptly to avoid more severe problems.

6. Can a DIY enthusiast fix OBDII code P1720 in a BMW at home?

While some simple checks and repairs can be done at home, diagnosing and fixing complex issues related to the CAN Timeout Control Module may require specialized knowledge and tools. Consulting a professional mechanic is often the best course of action.

7. How much does it typically cost to repair OBDII code P1720 in a BMW?

The cost of repair can vary widely depending on the specific cause of the code, labor rates in your area, and whether any parts need to be replaced. It's advisable to get a few quotes from reputable auto repair shops.

8. Can a low battery voltage cause OBDII code P1720 in a BMW?

Yes, a low battery voltage or a weak battery can sometimes lead to communication issues between the control modules in the vehicle, potentially triggering the CAN Timeout Control Module error code.

9. How long does it usually take to repair OBDII code P1720 in a BMW?

The repair time can vary depending on the exact cause of the code and the complexity of the fix. It can range from a quick fix that takes a few hours to a more involved repair that may require a day or more.

10. Is it possible for OBDII code P1720 in a BMW to reoccur after being repaired?

If the underlying issue is not properly addressed, there is a possibility that the code may reappear. Ensuring that all related components are thoroughly inspected and repaired can help prevent a recurrence of the problem.