MK5 Golf GTI

All Things Mk5 => Mk5 General Area => Topic started by: TheBALDpuma on September 26, 2025, 09:24:57 pm

Title: Sudden power loss under acceleration
Post by: TheBALDpuma on September 26, 2025, 09:24:57 pm

Hi all, looking for some thoughts.

I was just re joining the A1 after the services and accelerating relatively hard on the slip road when at about 60mph it felt like I hit a sudden limiter and just lost all power. It then wouldn't accelerate much past 60, and if I let the speed drop it was really really slow to pick the speed back up. Felt like a sudden limp mode but there were no warning lights and otherwise engine running fine.

I pulled over, turned the engine off and on again a couple of times and drives off and all is fine. Power back to normal. Running fine. Did about another 100 miles no issues.

Any thoughts what's going on?

Title: Re: Sudden power loss under acceleration
Post by: GVK on September 26, 2025, 09:51:14 pm

Was going to suggest you had a boost hose come off , but a restart wouldn't solve that!

Any warning lights on when it faulted?

Title: Re: Sudden power loss under acceleration
Post by: TheBALDpuma on September 26, 2025, 10:15:13 pm

No warning lights at any point

Chatgpt has come up with a few options, from reading the options I'm thinking the N75 boost control solenoid could be to blame - anyone got any experience?

Title: Re: Sudden power loss under acceleration
Post by: GVK on September 26, 2025, 11:09:36 pm

Could be that, I know they are a mission to fit on the mk5, buried round the back of the engine under the turbo.

I know you didn't have any warning lights on but can you check if any codes stored such as underboost etc?

Title: Re: Sudden power loss under acceleration
Post by: TheBALDpuma on September 27, 2025, 07:15:43 am

Hey that's probably a good shout - will have to go to my local mechanic