“ – coming up as ‘Internal fault – steering column module’. Anyone solved this without replacing the whole COM2000? Cleared twice, keeps returning.”
Specifically, the code is defined as:
Inside the turbocharger, there are variable nozzle vanes that adjust the angle of exhaust gas flow. Over time, carbon buildup from diesel exhaust can cause these vanes to seize. If they are stuck in the "open" position, the turbo will not generate sufficient boost pressure at lower RPMs. b123a renault
If you're writing about or discussing "b123a renault" in the context of paperwork or documents related to vehicles, it might refer to a vehicle registration document, a service history, or another form of paperwork associated with a Renault vehicle bearing that registration. “ – coming up as ‘Internal fault –
This is the most common cause on the 1.5 dCi engine. The solenoid valve controls the vacuum that opens and closes the variable geometry vanes inside the turbo. If this plastic valve fails (often due to heat fatigue or seized internals), it cannot adjust the turbo pressure, triggering the B123A code. Over time, carbon buildup from diesel exhaust can