U1901
CAN Network No. 2 Communication Bus Fault - Receive Error
U1901 is an OBD-II diagnostic trouble code meaning: CAN Network No. 2 Communication Bus Fault - Receive Error. Common causes: open or short circuit in the wiring of can bus no. 2, corrosion or damage to can network connectors. Estimated repair cost: $6–56.
Symptoms
- Check Engine Light Is On
- Unstable operation of the dashboard
- Failure of some electronic systems
- Problems with data transfer between modules
- The car may go into emergency mode
Causes
- Open or short circuit in the wiring of CAN bus No. 2
- Corrosion or damage to CAN network connectors
- Fault in one of the modules connected to the bus
- Problems with CAN controller power supply
- Damage to CAN bus terminal resistors
How to Fix
- Check the integrity of the wiring of CAN bus No. 2
- Inspect and clean all CAN network connectors
- Check the supply voltage of the CAN controller
- Scan all modules connected to the bus
- Check the resistance of the CAN bus (should be about 60 ohms)
Related codes
FAQ
What does the U1901 code mean?
U1901 is an OBD-II diagnostic trouble code that indicates: CAN Network No. 2 Communication Bus Fault - Receive Error
What causes a U1901 error code?
The most common causes of U1901 include: Open or short circuit in the wiring of CAN bus No. 2; Corrosion or damage to CAN network connectors; Fault in one of the modules connected to the bus; Problems with CAN controller power supply.
How do I fix a U1901 diagnostic trouble code?
To fix U1901: Check the integrity of the wiring of CAN bus No. 2. Inspect and clean all CAN network connectors. Check the supply voltage of the CAN controller. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U1901?
Limited driving only, diagnose soon
How much does it cost to fix U1901?
The estimated repair cost for U1901 is $6–56. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat