The transmission control module (TCM) is located in the control module box in the engine compartment, position no.3, along with other control modules for engine management systems.

1 P/N,Volvo
2 Identification code
3 Drawing issue, Volvo
4 Serial number
5 Number as per car specification, type code
6 Location, compartment no.3 in the control module box

The system operates with two main types of control modules, both when it applies to the transmission and engine.

GROUP I:

AW5O-42, Fenix 5.2 and EZ129K/LH3.2 for engine variants as shown. All connections have a signal supply voltage of 3 Volts.

GROUP II:

AW5O-42, Fenix 5.2 and Motronic 4.3 for the B5202S, B5252S, B5254S and B5234T engines as shown. The connections in the transmission control module which are connected to the engine management control module have a 12 Volt signal supply. See also GC. AW5O-42 Signal description and GD.Connectors, electronics box/control module. Testing and Inspection Volvo / OBD II Diagnostics, G. Signal Tables.

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

Use the Manual With the Right Hardware

When to See a Mechanic

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