U0008
High Speed CAN Communication Bus (-) High
U0008 is an OBD-II diagnostic trouble code meaning: High Speed CAN Communication Bus (-) High. Common causes: broken wire in the can bus (-), short circuit in can bus (-). Estimated repair cost: $6–56.
Symptoms
- Check Engine light comes on
- Unstable engine operation
- Gear shifting problems
- Security systems failure
- Dashboard malfunctions
Causes
- Broken wire in the CAN bus (-)
- Short circuit in CAN bus (-)
- Wiring harness damage
- Malfunction of one of the modules connected to the CAN bus
- Corrosion or oxidation of contacts
How to Fix
- Check the integrity of the CAN bus wires (-)
- Check for short circuit in the circuit
- Inspect the wiring harness for damage
- Check contacts for corrosion
- Diagnose modules connected to the CAN bus
Related codes
Error U0008 by Vehicle Brand
FAQ
What does the U0008 code mean?
U0008 is an OBD-II diagnostic trouble code that indicates: High Speed CAN Communication Bus (-) High
What causes a U0008 error code?
The most common causes of U0008 include: Broken wire in the CAN bus (-); Short circuit in CAN bus (-); Wiring harness damage; Malfunction of one of the modules connected to the CAN bus.
How do I fix a U0008 diagnostic trouble code?
To fix U0008: Check the integrity of the CAN bus wires (-). Check for short circuit in the circuit. Inspect the wiring harness for damage. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0008?
Do not drive — repair immediately
How much does it cost to fix U0008?
The estimated repair cost for U0008 is $6–56. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat