TECHNICAL SERVICE BULLETIN

Reference Number(s): 24 04 93 (3931), Date of Issue: January, 1994

TRANSMISSION CONTROL MODULE FAULT CODE 40

Model(s): E34 (5 series), E36 (3 series) with A4S 310R A/T

Group: 24 - Automatic Transmission

Bulletin No.: 24 04 93 (3931)

Date: January, 1994

COMPLAINT

"Trans Program" is displayed in the matrix (E34) or the transmission fault indicator is illuminated (E36). Cycling of the ignition restores normal operation. Fault code 40, pressure regulator, is stored in the fault memory of the transmission control module.

CAUSE

Investigations are still pending into the cause of this fault. Experience has shown that replacement of the pressure regulator does not eliminate this fault.

In order that we may bring this investigation closer to an explanation, we are requesting that all parts returned to the Warranty Parts Reclaim Center for this fault include a copy of the transmission control module identification page and output testcode along with the data in the RAM cells. When describing the problem and cause under 'Claim Comments by Defect Code,' please use the phrase "EGS Fault Code 40" followed by any other comments which you feel describe the situation. Samples of the Service Tester and MoDiC printouts are shown for your reference. See Fig 1 and Fig 2 .

Fig 1: Service Tester Printout

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Transmission Control Module Fault Code 40 (24 04 93 (3931))