U2021
Invalid /Fault Data Received
U2021 is an OBD-II diagnostic trouble code meaning: Invalid /Fault Data Received. Common causes: damage to the can bus wiring harness, poor contact in module connectors. Estimated repair cost: $6–56.
Symptoms
- Check Engine light comes on
- Malfunctions of the car's electronic systems
- Incorrect operation of certain functions
- Intermittent communication between modules
Causes
- Damage to the CAN bus wiring harness
- Poor contact in module connectors
- Malfunction of one of the electronic modules
- Problems with module power supply
- Software failures in modules
How to Fix
- Check the integrity of the CAN bus wiring harness
- Inspect and clean contacts in module connectors
- Check power supply of all connected modules
- Read error codes from other modules
- Update module software
Related codes
FAQ
What does the U2021 code mean?
U2021 is an OBD-II diagnostic trouble code that indicates: Invalid /Fault Data Received
What causes a U2021 error code?
The most common causes of U2021 include: Damage to the CAN bus wiring harness; Poor contact in module connectors; Malfunction of one of the electronic modules; Problems with module power supply.
How do I fix a U2021 diagnostic trouble code?
To fix U2021: Check the integrity of the CAN bus wiring harness. Inspect and clean contacts in module connectors. Check power supply of all connected modules. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U2021?
Yes, but get it checked soon
How much does it cost to fix U2021?
The estimated repair cost for U2021 is $6–56. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat