Engine/Transmission Controls - SES Lamp ON/DTC 279B

Service Measure

Cooling Systems
17 200 04
2/10/2004

Subject
Transmission Fluid Thermostat Replacement

Model
Z4 with 2.5 or 3.0 liter engine and automatic transmission. From start of production through August 2003.

Complaint
Service engine soon light on and/or fault code 279B (map cooling, not currently present) stored in DME memory.

Cause
Defective transmission fluid thermostat.

Measure
If the above situation is encountered, replace the transmission fluid thermostat with a new one having part number 17 11 2 249 366. Do not replace the engine thermostat unless diagnosis reveals additional faults caused by insufficient engine warm up or poor heat output complaints.

Please refer to SI B17 02 03 for further information regarding the new style transmission thermostat.