Stopping BMW Loss of Power

Aug. 7, 2023
This bulletin applies to all BMW models equipped with the N20, N26 and N55 engines produced to November 2015. Intermittently the engine may experience a loss of power along with a Drivetrain Malfunction message.

This bulletin applies to all BMW models equipped with the N20, N26 and N55 engines produced to November 2015. Intermittently the engine may experience a loss of power along with a Drivetrain Malfunction message. The MIL may also be on. There are one or more of the following air mass plausibility and Valvetronic system faults stored in the DME memory:

E-Series with BN2000:

2775...air mass, plausibility; air mass too low

2C57....charging pressure control, plausibility; pressure too low

2DCE...Valvetronic system: no adjustment possible

3164....fuel tank ventilation system, second inlet point: malfunction

F-Series with BN2020:

102002.....air mass, plausibility: air mass too low

120308.....charging pressure control, plausibility: pressure too low

133B04......Valvetronic system: no adjustment possible

191C02.......fuel tank ventilation system, 2nd inlet point, malfunction

Cause: Defective Valvetronic or tank ventilation component’ erroneous faults set due to DME software parameters.

Using the latest version of ISTA, perform all recommended test plans. Visually check that there are no leaks in the lines or connectors of the charge air system. If any faults were detected, make the needed repairs and program the vehicle to the specified integration level using ISTA/P 3.57.0 or higher. If no faults were detected, program the vehicle to update the DME software.

About the Author

Information courtesy of Mitchell 1

Information for Technical Service Bulletins comes from ProDemand, Mitchell 1's auto repair information software for domestic and import vehicles. Headquartered in San Diego, Mitchell 1 has provided quality repair information solutions to the automotive industry since 1918.

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