Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Control Module Swapping (TJ 31946.1.2)
Reference number: TJ 31946.1.2
Supersedes refnos: TJ 31946.1.0
CONTROL MODULE SWAPPING
TECHNICAL SERVICE BULLETIN
| VOLVO: | All Models |
| FUNC GROUP: | 3600 |
| FUNC DESC: | Other electrical equipment |
ATTACHMENT
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VEHICLE TYPE
| Type | Eng | Eng Desc | Sales | Body | Gear | Steer | Model Year | Plant | Chassis range | Struc Week Range |
|---|---|---|---|---|---|---|---|---|---|---|
| XXX | 1927-9999 | 0000001-9999999 | 0-0 |
CSC CUSTOMER SYMPTOM CODES
| Code | Description |
|---|---|
| 3L | Technician information/Repair information/Not for warranty use |
| 2V | Technician information/Software/Vehicle communication/Not for warranty use |
VST OPERATION NUMBER
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DTC DIAGNOSTIC TROUBLE CODES
Rows beginning with * are modified
TEXT
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DESCRIPTION
Swapping control modules from vehicle to vehicle for diagnostics should be avoided.
Swapping control modules may result in consequential damage to the swapped control module and in certain cases several other control modules in the vehicle.
Swapping the Driver Information Module (DEVI) is strictly forbidden as the DEVI it is the main carrier of the odometer function, and will, in case of swapping, result in manipulated odometer value.
SERVICE
Please do NOT swap any control modules from vehicle to vehicle for testing, unless instructed to do so in a Vehicle Report by the Technical Helpdesk.
VEHICLE REPORT
N/A
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.