U1901 Code - CAN Network No. 2 Communication Bus Fault - Receive Error
Quick Answer
The U1901 diagnostic trouble code (DTC) refers to a fault in the Communication Area Network (CAN) No. Common causes include Faulty wiring harness or connectors in the CAN No, 2 bus system, Defective control module in the communication network. 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
- U1901 indicates CAN Network No. 2 Communication Bus Fault - Receive Error.
- Common causes
- Common causes include Faulty wiring harness or connectors in the CAN No, 2 bus system, Defective control module in the communication network.
- 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 U1901 Description
The U1901 diagnostic trouble code (DTC) refers to a fault in the Communication Area Network (CAN) No. 2 bus communication system in the vehicle. The CAN bus is a network that allows different modules within the vehicle, such as the engine control module, transmission control module, airbag module, and others, to communicate with each other. When the U1901 code is triggered, it indicates that there is a communication issue on the second CAN bus, specifically related to receiving data.
Common Causes of U1901
- Faulty wiring harness or connectors in the CAN No. 2 bus system
- Defective control module in the communication network
- Software glitches or programming errors in the modules
- Electromagnetic interference disrupting communication signals
- Physical damage to the CAN bus network components
Symptoms of U1901
- Check engine light illuminated on the dashboard
- Transmission warning light activated
- Erratic engine performance, such as rough idling or stalling
- Loss of communication with certain vehicle systems, such as ABS or airbag modules
- Inconsistent data readings on dashboard displays
How to Fix U1901
- Begin by conducting a thorough inspection of the wiring harness and connectors in the CAN No. 2 bus system to identify any visible damage or loose connections.
- Use a diagnostic scan tool to read and clear the U1901 code and check for any related codes that may provide further insight into the issue.
- Test the communication signals between modules using a multimeter or oscilloscope to pinpoint the source of the fault.
- Replace any faulty wiring harnesses, connectors, or control modules as necessary to restore proper communication on the CAN bus network.
- Clear the DTC and perform a test drive to verify that the issue has been resolved and that all systems are functioning correctly.
Cost to Fix U1901
The cost of repairing a U1901 code can vary depending on the specific cause of the communication fault and the extent of the repairs needed. In general, the typical repair costs for addressing this issue can range from $200 to $500, including parts and labor. However, it's important to note that the actual costs may be higher or lower based on factors such as the location of the repair shop, the make and model of the vehicle, and the complexity of the repair process. Diagnostic time and labor rates at auto repair shops can vary, with hourly rates typically ranging between $80 and $150. It's recommended to consult with a qualified mechanic or dealership for a more accurate estimate based on your vehicle's specific requirements.
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Code U1901 Information for Specific Makes
- U1901 Buick — Lost Communication With Infotainment Multifunction Switch Module
- U1901 Cadillac — Lost Communication With Infotainment Multifunction Switch Module
- U1901 Chevrolet — Lost Communication With Infotainment Multifunction Switch Module
- U1901 Ford — CAN Network No. 2 Communication Bus Fault - Receive Error
- U1901 GMC — Lost Communication With Infotainment Multifunction Switch Module
- U1901 Lincoln — CAN Network No. 2 Communication Bus Fault - Receive Error
- U1901 Mercury — CAN Network No. 2 Communication Bus Fault - Receive Error
Frequently Asked Questions about U1901 Code
1. What are common symptoms of OBDII code U1901?
- Common symptoms include issues with the vehicle's communication systems, such as intermittent or complete loss of communication with certain modules, warning lights on the dashboard, and potential drivability issues.
2. What can cause the OBDII code U1901 to appear?
- The code U1901 usually indicates a communication fault on the CAN Network No. 2, which can be caused by wiring issues, faulty control modules, damaged connectors, or software glitches.
3. How can I diagnose the cause of OBDII code U1901?
- Diagnosing U1901 requires using a professional diagnostic scan tool to access the network and check for communication faults, inspecting the wiring and connectors for damage, and testing the control modules for proper functioning.
4. Is it safe to drive with OBDII code U1901 present?
- It is not recommended to drive with the U1901 code present, as it can lead to potential safety hazards due to communication failures between critical vehicle systems.
5. Can I repair OBDII code U1901 myself?
- Repairing the U1901 code may require advanced diagnostic and electrical skills. It is recommended to seek help from a qualified mechanic or technician to properly diagnose and repair the communication bus fault.
6. How much does it cost to fix OBDII code U1901?
- The cost of fixing U1901 can vary depending on the root cause of the communication fault. It may range from a simple wiring repair to replacing faulty control modules, potentially costing a few hundred to a few thousand dollars.
7. Are there any common fixes for OBDII code U1901?
- Common fixes for U1901 may include repairing damaged wiring, replacing faulty control modules, updating software, resetting the system, or reprogramming the modules to restore communication on the CAN Network No. 2.
8. Can a low car battery cause OBDII code U1901?
- A low car battery can potentially cause communication issues leading to the U1901 code. It is important to ensure the battery is in good condition and properly charged to prevent network faults.
9. What should I do if OBDII code U1901 keeps coming back after being cleared?
- If the U1901 code keeps reappearing after being cleared, it indicates a persistent communication fault that requires further diagnosis and repair. It is advisable to consult a professional technician for a thorough inspection.
10. Is OBDII code U1901 related to emission control systems?
- OBDII code U1901 is not directly related to emission control systems but rather indicates a communication fault on the CAN Network No. 2, which can affect the overall performance and functionality of various vehicle systems.
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