Auto gearbox ECU is draining the battery
2008 Renault Laguna 2.0 t tourer

Automatic gearbox on my 08 Laguna 2.0t petrol is showing fault ECU bad earth and is draining the battery.
Local garage has had the car for three weeks and can't find the fault
Any clues?

Problem added: Aug 20, 2021 (5 months ago)
Renault Laguna (2008)
2.0 t tourer
Problem Category
Gearbox & Clutch
Electrics, ECU, Warnings & Lights
Replies and fixes
Tried cleaning up earthing or running a new earth from unit body ( if possible .) and carried out a parasitic drain test to verify that is where the fault lies .Check wiring harness , Renault electrics are not the best
Thanks I'll pass this to my garage
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Parts mentioned on this page
Battery
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Automatic Gearbox
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Gearbox
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