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12 03 19_ENGINE DOES NOT START BELOW FREEZING TEMPERATURES

SIB 12 03 19
ENGINE DOES NOT START BELOW FREEZING TEMPERATURES

2019-12-30

This Service Information Bulletin (Revision 1) replaces SI B12 03 19 dated February 2019.
What’s New (Specific text highlighted):

Engine designation correction
Parts availability
Warranty

MODEL
F22 (2 Series Coupe)
with B46O, B58M

F23 (2 Series
Convertible) with B46O,
B58M
F32 (4 Series Coupe)
F33 (4 Series
with B46O, B58M
Convertible) with B46O,
B58M
G01 (X3 Sports Activity
G02 (X4 Sports Activity
Vehicle)
Coupe)
G29 (Z4 Roadster) with
G30 (5 Series Sedan)
the B46D
with the B46D, B46O,
B58M
Produced through the end of February 2019.

F30 (3 Series Sedan)
with B46O, B58M

F31 (3 Series Sports
Wagon) with B46O

F34 (3 Series Gran
Turismo) with B46O,
B58M
G12 (7 Series Sedan)
with the B58M
G32 (640i xDrive Gran
Turismo) with the B58M

F36 (4 Series Gran
Coupe) with B46O,
B58M
G20 (3 Series Sedan)
with the B46D

SITUATION
The engine will not start at temperatures below freezing. The starter does not turn and engage.
This Check Control (CC) message is displayed: “Not possible to start engine.”
Once the entire vehicle has warmed up either in the workshop or outside (temperatures above freezing),
the engine can be started again. At that point, the fault can no longer be reproduced in the workshop.
Any of the following fault memory entries are possible:
Fault code:
930730
804095

Control module:
CAS
FEM20

804095

BDC

33AE00

DME (G20, G29
only)

Fault code text:
KL50L driver: Current overload
KL50L driver: Current overload
Engine does not start while starter motor is operating: Current
overload in KL50L driver
Starter solenoid, overload protection: Current interruption for starter
engagement

CAUSE
Condensation may form inside the starter motor after a drive while the powertrain is cooling off. If the
ambient outside temperature falls below freezing, a layer of ice may form on the starter’s internal electrical
contacts. The ice acts as an insulator, preventing electrical current flow through the contacts.
Once the temperature rises above freezing, the ice layer melts and the starter motor works normally. As a
result, it is often not possible to detect the source of the fault.
High fluctuations of the ambient temperature increase the risk of moisture formation.
Application table:

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Engine:
B46O
B46D
B58M

Body:
G01, G02, G30
G20, G29
G01, G02, G12, G30, G32

Brand:
Bosch or SEG
Valeo
Bosch or SEG

Note: There are no problems with the vehicle battery or other start-inhibiting causes, such as fuel system or
EWS; etc. faults.

CORRECTION
Revised starters are being phased into production between December 2018 and February 2019 depending
on the engine and vehicle plant.
1. Identify the starter brand and change index per the manufacturer’s label on the starter housing.
2. Replace the starter motor per the Procedure.

PROCEDURE
B46O, B58M engines:
1. Perform vehicle diagnosis with ISTA.
2. Check which starter motor is installed:
•
SEG label shown, the BOSCH label
follows the same layout.
•
If a Bosch or SEG starter motor is
installed, replace it with a Denso unit Part
Number 12 41 8 577 010 (confirm the P/N in
ETK).
Refer to Repair Instructions 12 41 020 “Removing
and installing/replacing the starter motor”.
Original starter P/N for reference:
B46O:
•
12 41 8 621 838 or
•
12 41 8 621 839
B58M:
•
12 41 8 621 840
3. Note: The noise damping plug P/N 12 41 8 571 350 must also be installed into the replacement Denso
starter.
4. Clear the fault memory and reassess the vehicle.

If possible, park vehicle outdoors overnight if the temperature forecast will be below freezing.
Next day, confirm normal starter operation and engine starting.
B46D engine (Valeo starter):
1. Perform vehicle diagnosis with ISTA
2. Check which starter motor is installed:

Valeo label shown to the left.
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If the original change index is as
indicated below, replace the starter
Refer to Repair Instructions 12 41 020
“Removing and installing/replacing the
starter motor”

Engine:
B46D
B46D
B46D

Original starter P/N:
12 41 8 671 503
12 41 8 671 504
12 41 8 588 898

Replacement starter P/N (confirm via ETK):
12 41 8 693 976
12 41 8 693 977
12 41 8 588 902

Affected original change index:
Thru and including AI03
Thru and including AI02
Thru and including AI07

Change index with starter revisions:
As of AI04
As of AI03
As of AI08

3. Clear the fault memory and reassess the vehicle.
If possible, park vehicle outdoors overnight if the temperature forecast will be below freezing. Next day,
confirm normal starter operation and engine starting.

PARTS INFORMATION
Obtain the part numbers for your specific vehicle by entering the chassis number in ETK which takes into
account specific equipment and/or options.
The starter motor and noise dampening plug are now available for ordering.
Part Number
Refer to ETK
12 41 8 571 350

Description
Exchange* starter motor
Noise damping plug (only in conjunction with Denso
starter motor)

Quantity
1
1

*Applies to vehicles with “in-service” dates (DCSnet Warranty Vehicle Inquiry).

WARRANTY INFORMATION
Covered under the terms of the BMW New Vehicle Limited Warranty for Passenger Cars and Light Trucks or
the BMW Certified Pre-Owned Program.
Defect Code:

1241001100

Labor Operation

Description
Performing vehicle test (with vehicle diagnosis system –
checking faults) (Main work)

00 00 006

Starter motor temporary failure
Labor Allowance
Refer to AIR

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Or:
00 00 556
And, as necessary:
61 00 006
And/or:
12 00 009
And:
12 41 520

Performing vehicle test (with vehicle diagnosis system –
checking faults) (Plus work)

Refer to AIR

Performing vehicle diagnosis – test module

Work time (WT)

Troubleshooting

Work time (WT)

Replace starter motor (Plus work)

Refer to AIR

If you are using a Main labor code for another repair, use the Plus code labor operation 00 00 556 instead of
00 00 006.
Refer to AIR for the corresponding flat rate unit (FRU) allowances.
Work time labor operation codes 61 00 006 and 12 00 009 are not considered Main labor operations;
however, both do require individual punch times and explanations on the repair order and in the claim
comments section.

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