U0008
High Speed CAN Communication Bus High
This code indicates high speed can communication bus high (+). It relates to the network / communication and may affect performance, emissions, or drivability depending on the exact failure.
High Speed CAN Communication Bus High (+)
Common causes
- medium
Faulty sensor or actuator
The component monitored by this code may be worn, failed, or reading out of range.
Typical part cost: $100-400
- medium
Wiring or connector issue
Corroded, damaged, or loose connections can cause circuit or signal faults.
Typical part cost: $100-400
See all causes + fix costs
Create a free Wrenchify account to unlock the rest for U0008.
Unlock causesFree forever · No credit card
First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
Get the full step-by-step diagnosis
Create a free Wrenchify account to unlock the rest for U0008.
Unlock diagnosisFree forever · No credit card
Related codes
See related trouble codes
Create a free Wrenchify account to unlock the rest for U0008.
Unlock related codesFree forever · No credit card
Frequently asked questions
What does U0008 mean?
U0008 means "High Speed CAN Communication Bus High (+)". It is a generic OBD-II code that points to a fault in the network / communication.
Can I keep driving with this code?
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.
Get the full U0008 diagnosis for your vehicle
Year, make, model + step-by-step repair help — free plan included.