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Sam, BMW Master technician
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Experience:  BMW S.T.E.P. graduate, 10 years BMW dealership experience
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code 48 transmission, lock up clutch slip too much. Mechanic

Resolved Question:

code 48 transmission, lock up clutch slip too much. Mechanic tells me that torque converter needs to be replaced. Is that right?
Submitted: 4 years ago.
Category: BMW
Expert:  Sam replied 4 years ago.

Hello and welcome to Just Answer.

 

How many miles are on the car/transmission?

 

Are there any other transmission or engine codes stored?

Customer: replied 4 years ago.

110,000 miles total.

no engine code stored. however, transmission code 6 & 7 stored. for now, all codes cleared and I am driving without any light comes on.

Expert:  Sam replied 4 years ago.

Well, good news. There is a bulliten for this fault code. Every time I have seen this fault stored the seal described in this bulliten is damaged as noted. If the seal is not damaged, the converter will need to be replaced.

 

Service Information bulletin SI 24 03 06

 

designates changes to this revision

 

SUBJECT
ZF 5HP19 Transmission - Diagnosis of EGS FC 048 (30 hex)

 

 

MODEL
E46: 323i, 325i, 330i with M52TU, M54, M56 and ZF 5HP19

 

E39: 525i, 530i with M54 and ZF 5HP19

 

E85: Z4 roadster 2.5, 3.0 with M54 and ZF 5HP19

 

 

SITUATION
"Service Engine Soon" is illuminated and fault code 048 "Converter lock-up excessive slip" (30 hex or P0741) is stored in the EGS transmission control module.

 

CAUSE
Possible cause: deterioration of the torque converter turbine shaft seal

 

PROCEDURE

  1. Remove the torque converter. For the removal procedure, refer to Repair Manual RA24 40 002.

     

S2406U01

2. Drain the fluid out of the torque converter, and carefully inspect the turbine shaft seal (1) INSIDE THE BOTTOM OF THE TORQUE CONVERTER for signs of damage (cracks, splits, etc.).Helpful Hints:
3. Use a small flashlight to illuminate inside the bottom of the torque converter to examine the turbine shaft seal. The turbine seal is brownish orange in color and measures approximately 1" in diameter.
If evidence of seal deterioration is found, replace the torque converter.

  1. Additionally, if the transmission fluid shows signs of deterioration ("dirty fluid"), the fluid should be replaced in conjunction with the fluid strainer. For the strainer replacement procedure, refer to Repair Manual RA24 31 151.

     

  2. Refill and/or top off the fluid level according to Repair Manual RA 00 11 500, using ESSO ATF LT 71141 (P/N 83 22 9 407 807).
Sam, BMW Master technician
Category: BMW
Satisfied Customers: 1043
Experience: BMW S.T.E.P. graduate, 10 years BMW dealership experience
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