BMW TSB #B160316
2014 BMW 535
Affected Component: ENGINE AND ENGINE COOLING
- Summary
- BUZZING OR CLICKING NOISE FROM THE SCR TRANSFER PUMP. There is a buzzing or clicking noise coming from under the car that can be heard from the passenger compartment when the engine is at idle. Normal operation of the SCR transfer pump delivering diesel exhaust fluid (DEF) from the passive to active tank.