A fault code doesn’t yet mean the unit or sensor itself is faulty: often it’s the plug and connector leading to it.
Possible causes
- The gearbox control unit has its own code
What you can do yourself
- Check the gearbox fluid level and condition.
- Read the codes in the gearbox control unit — they give the exact cause.
Stop and don’t drive on if:
- The Check Engine light is flashing
- The temperature gauge is in the red or the overheating light is on
- The red oil pressure light is on
- Smoke from under the bonnet, a burning or petrol smell
- Strong jerking, knocking from the engine, or the car barely moves
OA case from Oleg’s practice
- Subaru Outback 2025 Driver assistance warnings now and then, more than 20 codes stored. After clearing, only B2D04 remained — front camera circuit: the connector latch was broken. We repaired the connector; recheck the rest after a few days of driving. How it went ↗
On Oleg’s website:Transmission adaptation ↗
The explanation comes from the error code reference in the AvtoElektrik PRO app.