U0071
Vehicle Communication Bus E (-) High
U0071 is an OBD-II diagnostic trouble code meaning: Vehicle Communication Bus E (-) High. Common causes: open circuit in the can bus (-), short circuit to ground or power. Estimated repair cost: $6–56.
Symptoms
- Check engine light comes on
- Problems with the operation of car electronic systems
- Loss of communication between control modules
- Problems with the dashboard
- Malfunctions of comfort functions
Causes
- Open circuit in the CAN bus (-)
- Short circuit to ground or power
- Poor contact in connectors
- Wiring harness damage
- Malfunction of one of the control modules
How to Fix
- Check the continuity of the CAN bus circuit (-)
- Inspect connections and connectors for corrosion
- Check resistance and absence of short circuits
- Replace damaged wiring sections
- Check operation of control modules
Related codes
Error U0071 by Vehicle Brand
FAQ
What does the U0071 code mean?
U0071 is an OBD-II diagnostic trouble code that indicates: Vehicle Communication Bus E (-) High
What causes a U0071 error code?
The most common causes of U0071 include: Open circuit in the CAN bus (-); Short circuit to ground or power; Poor contact in connectors; Wiring harness damage.
How do I fix a U0071 diagnostic trouble code?
To fix U0071: Check the continuity of the CAN bus circuit (-). Inspect connections and connectors for corrosion. Check resistance and absence of short circuits. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0071?
Do not drive — repair immediately
How much does it cost to fix U0071?
The estimated repair cost for U0071 is $6–56. Actual cost depends on your vehicle, location, and labor rates.
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