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SI B11 10 12
Engine

January 2013
Technical Service

SUBJECT

N20 Engine: Repeated Juddering or Surging While Accelerating
MODEL

E84
E89
F10
F25
F30
SITUATION

The vehicle judders or surges repeatedly while accelerating in hot ambient temperatures between 3,000 RPM and 5,000
RPM. The Service Engine Soon lamp is not illuminated, and no fault codes are stored in the vehicle memory related to
this complaint.
CAUSE

The EPDW (electropneumatic pressure convertor) for the turbocharger wastegate valve is binding internally.
PROCEDURE

When no fault codes related to this complaint are stored in the vehicle’s memory:

1. Remove the engine
acoustic cover as per
Repair Instruction 11
12 090, “Removing and
installing/renewing
acoustic cover (N20).”
2. Locate the EPDW
located near the engine
oil fill cap.

3. On the side the EPDW,
there is a series of
numbers printed.
Do not remove the
EPDW.

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The date code located
on the side of the
EPDW needs to be
12T158 or greater.
If the date code is
12T157 or lower, the
EPDW will need to be
replaced.
Refer to the illustration.

4. Remove the electrical
connector (1).
5. Remove the screws (2).
6. Remove vacuum lines
marked “OUT” and
“VAC.”
7. Remove EPDW.
8. Install the new EPDW,
connectors and vacuum
lines. Install and torque
the attaching screws to
3 Nm (2).
Note: When the ISTA system message displays: Battery voltage only “XX.XX” V. Please connect charger. Please note
the displayed battery voltage reading in the repair order comments section. This documentation is not necessary when
part of an approved Technical Service repair procedure; the battery charger is required to be attached before performing
the Vehicle Test.
PARTS INFORMATION

Part Number

Description

11 74 7 626 351

EPDW

Quantity
1

WARRANTY INFORMATION

Covered under the terms of the BMW New Vehicle/SAV Limited Warranty or the BMW Certified Pre-Owned Limited
Warranty.
Defect Code:

11 65 23 12 00

Labor Operation:

Labor Allowance:

Description:

00 00 006

Refer to KSD2

Performing “vehicle test” (with vehicle

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diagnosis system – checking faults)
and if necessary, also
61 21 528

Refer to KSD2

Charging battery

Refer to KSD2

Replacing pressure converter for
turbocharger

and
11 74 507

Labor operation code 00 00 006 is a Main labor operation. If you are already using a Main labor code for another
repair, use the Plus code labor operation 00 00 556 instead.
Refer to KSD2 for the corresponding flat rate unit (FRU) allowance. Enter the Chassis Number, which consists of the
last 7 digits of the Vehicle Identification Number (VIN). Click on the “Search” button, and then enter the applicable
flat rate labor operation in the FR code field.
Other Repairs
If performing other ISTA diagnostics and the related test plans results with eligible and covered work, claim this work
with the applicable defect code and labor operations listed in KSD2.
Note: Please follow any TeileClearing (TC) or Diagcode (DC) requirements that may apply to this additional work.
[ Copyright © 2013 BMW of North America, LLC ]

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