I've recently bought a V40 2.0 D3 late 2016 automatic RHD and whilst I am delighted with the car I noticed on driving it back from the seller that the car lost poser for a few seconds as I was turning off a dual carriageway onto a slip road, I put it down to the gearbox getting in a muddle with the gears, but since then it has happened again on a straight stretch of road where I watched the rev counter slowly drop then a few seconds later climb back up. No warning lights were shown, no messages have appeared on the dashboard and my OBD II tool shows no fault codes.

After doing some research, I'm starting to suspect the issue is with the connections from the accelerator pedal to the CEM which I've read consists of two cables an analogue and a digital and if the two disagree on the amount the pedal is being pressed it can cause issues, I've also read that the most common fix is to unplug the cables from the CEM, clean them and attach or to replace the analogue cable completely.

Does this sound reasonable and if so does anybody have a link to details on how to get to the CEM in my car, I believe it is behind the passenger glovebox, but I'm struggling to find a video which takes me through the steps to get to it.

Thanks in advance.

 

Before diving into anything, I would get the car scanned with a scanner that can communicate with all the modules. Just because there is no CEL on the dash, doesn't meant there isn't a code in the modules.

A lot of people here are in North America and Volvo did not release diesel engines here so we have very limited/no experience with them.

 

Thanks @Dingus1 after 3 weeks at a Volvo specialist garage and a £2K repair bill the issue was finally traced to water in the ECU box which has caused corrosion on the terminals. This explained why each time the engine stopped there were no fault codes recorded. The ECU was replaced and re-programmed and since then the car has been running fine.

The garage said the ECU box in this car (may also be the same for petrol versions) is located behind the front wheel near the base of the engine so driving through a large body of water was the likely cause.