U0401High urgency
Invalid Data Received From ECM/PCM
Network · CAN Bus
⛔ Multiple vehicle systems may malfunction due to receiving invalid engine data. Service immediately.
What this means
A module on the CAN bus received data from the ECM/PCM but the data was outside the valid range or had a checksum error.
Likely causes
- Failing ECM/PCM transmitting corrupt dataMost common
- CAN bus interference or shortCommon
- Software incompatibility after module updateLess common
Estimated repair cost
ECM diagnosis and reprogramming$100 – $400
ECM replacement$500 – $2,000
CAN bus repair$150 – $500
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Frequently asked questions about U0401
What does U0401 mean?
A module on the CAN bus received data from the ECM/PCM but the data was outside the valid range or had a checksum error.
Is U0401 serious?
Multiple vehicle systems may malfunction due to receiving invalid engine data. Service immediately.
How much does it cost to fix U0401?
Repair costs for U0401 range from $100 – $400 depending on the root cause and your vehicle.
Can I drive with U0401?
No — this code indicates a serious issue. Stop driving and have the vehicle inspected immediately.