OBD2 code U0023: Low Speed CAN Communication Bus (+) Shorted to Bus (-)
CAN-High and CAN-Low on the low-speed comfort bus are shorted together.
Detected Root Component
Network Component
Observed Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Possible Causes
- CAN-H/CAN-L shorted together
- Gateway module routing CAN messages incorrectly
- CAN terminating resistor (120 Ω) drifted out of spec
Tools Required
Interactive Diagnostic
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Parts likely to be the cause (Moteur (général))
Moteur (général)
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Frequently asked questions about code U0023
What does code U0023 mean? ▾
OBD2 code U0023: Low Speed CAN Communication Bus (+) Shorted to Bus (-). CAN-High and CAN-Low on the low-speed comfort bus are shorted together.
What are the symptoms of code U0023? ▾
Code U0023 may cause: Multiple warning lights may illuminate, Affected modules may go into limp mode or shut down, Specific functions inoperative depending on module, Diagnostic tools may show communication faults. The intensity of these symptoms varies depending on the vehicle and driving conditions.
What causes code U0023? ▾
The most common causes of code U0023 are: CAN-H/CAN-L shorted together, Gateway module routing CAN messages incorrectly, CAN terminating resistor (120 Ω) drifted out of spec. A proper OBD2 diagnostic will pinpoint the exact cause.
Is it serious to drive with code U0023? ▾
Yes, code U0023 is critical (Critical). Avoid driving and consult a professional promptly to prevent major damage.
How do I fix code U0023? ▾
Start by reading the code with an OBD2 scanner, then follow the interactive decision tree on this page. Priority causes to check: CAN-H/CAN-L shorted together, Gateway module routing CAN messages incorrectly, CAN terminating resistor (120 Ω) drifted out of spec. Difficulty: Medium · Estimated time: 30-60min.