U0070Communication Bus "B" Performance
The secondary communication bus (Bus B, often a chassis or comfort sub-bus) shows reduced performance — high error rate, intermittent dropouts, or framing errors. Bus is still alive but unreliable.
Can I keep driving? With caution
You can drive to the shop, but do not postpone the repair. The problem may worsen and damage other components.
Sistema Afectado
Red CAN · Comunicación entre módulos
Falla de comunicación en la red CAN: pérdida de datos entre las unidades de control (ECU).
Espacio para vendedores de repuestos
Aún no hay un anunciante en este espacio.
Symptoms You Will Notice
What you may observe when this code appears
- 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
The components or conditions that trigger this code
- 1Marginal wiring or corroded connector EMI interference (aftermarket equipment) Gateway module routing CAN messages incorrectly
How to Fix It — Step by Step
Recommended diagnostic and repair procedure
- 1Difficulty: hard. Estimated time: 1-5 hours. Estimated cost: €80-€
- 2Professional repair recommended
Note: This information is for general reference. For precise diagnostics and safety repairs, always consult a certified mechanic.
Estimated Cost
Approximate range in USD (varies by region and shop)
Communication modules
* Diagnosis only: $50–$150
Quick Info
Dig Deeper
Videos, images and service manuals
Have Another Code?
Look it up directly: