U0023
Low Speed CAN Communication Bus (+) High
U0023 is an OBD-II diagnostic trouble code meaning: Low Speed CAN Communication Bus (+) High. Common causes: broken or damaged can bus wiring, short circuit in the positive line of the can bus. Estimated repair cost: $33–167.
Symptoms
- Inoperability of some electronic systems
- Check engine light comes on
- Problems with the operation of the dashboard
- Automatic transmission malfunctions
- Lost connection with diagnostic equipment
Causes
- Broken or damaged CAN bus wiring
- Short circuit in the positive line of the CAN bus
- Malfunction of one of the control modules
- Poor contact in CAN bus connectors
- Problems with power supply to control modules
How to Fix
- Check the integrity of the CAN bus wiring
- Scan all modules for errors
- Check power supply and ground of control modules
- Check CAN bus connectors and connections
- Replace faulty modules if necessary
Related codes
Error U0023 by Vehicle Brand
FAQ
What does the U0023 code mean?
U0023 is an OBD-II diagnostic trouble code that indicates: Low Speed CAN Communication Bus (+) High
What causes a U0023 error code?
The most common causes of U0023 include: Broken or damaged CAN bus wiring; Short circuit in the positive line of the CAN bus; Malfunction of one of the control modules; Poor contact in CAN bus connectors.
How do I fix a U0023 diagnostic trouble code?
To fix U0023: Check the integrity of the CAN bus wiring. Scan all modules for errors. Check power supply and ground of control modules. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0023?
Do not drive — repair immediately
How much does it cost to fix U0023?
The estimated repair cost for U0023 is $33–167. Actual cost depends on your vehicle, location, and labor rates.
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