As its a diesel, it doesn't have an engine ecu, per se..use the settings for the auto gearbox and it will give you the codes from the ecu

Oh wow, I'm so glad I found this..I've had exactly the same intermittent problem..started when we were away in Wales luckily it repaired itself to get us home, but it's had me stumped since. Can I ask was it the ecu behind the glove box you changed? I'm guessing that's the only one? WL04189E1A?