The turbocharger actuator fails and the engine loses power: it accelerates slowly and runs out of pull on a climb. The fault code is P2599.
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The actuator controls the vane position in the turbocharger, and if it does not reach the commanded position the boost either fails to build or overshoots, and the engine management cuts power in response.
What to check
- Accelerate hard uphill at full throttle: the engine must not run out of pull or drop into limp mode
- Have the fault codes read and look for P2599 among them
- Watch the exhaust on start-up: thick blue or black smoke points at a boost fault