Hi
Got caught in heavy traffic yesterday and gearbox decided it didn't want to change up left for a while then back to normal
Put my code reader on it and no codes on gearbox just this on engine
Does anyone now what it is thanks

Yep. You have a duff engine thermostat and your gearbox went into cooling strategy likely caused by a clogged transmission cooler and or lower part of the main radiator.

Solution - fit modded thermostat (you will still get that error, but the engine will run better and safer)
fit new trans cooler and check rad for blockage or better still - replace. No7 - 2003 V8 Vogue

Thanks thought it maybe that
Ordered new rad and oil cooler
Also if I order the cool running thermostat do I need a new type cover or can I still use the original thanks