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willifuchs2

Astra Transmission Issues

Alright lads, need some help. My 2007 Vauxhall Astra diesel is throwing up some weird errors. The engine warning light keeps coming on, and sometimes the transmission light too. I scanned it and it's showing a transmission oil pressure sensor fault. Thing is, it's also going into limp mode sometimes, and the gearbox feels like it's slipping. I've even noticed some slight grinding noises when shifting. Could this be serious?

Summary of the thread

A 2007 Vauxhall Astra diesel was experiencing engine and transmission warning lights, limp mode, slipping, and grinding noises. The issue was identified as a transmission oil pressure sensor fault. Low gearbox oil was suspected as a cause, leading to inadequate pressure and lubrication. After topping up the oil and replacing the faulty pressure switch, most problems were resolved.

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4 comment(s)

haraldmoon48

Sounds like a pressure switch issue alright. Have you checked your gearbox oil level? Low oil level can cause the pressure sensor to throw errors and lead to those symptoms. Is it shifting uncleanly all the time, or just when the light is on?

willifuchs2 (community.author)

I haven't checked the oil level yet, to be honest. I'll get on that. But if the oil is low, would that really cause all those problems at once? The light, the slipping, the grinding... it seems like a lot for just low oil.

haraldmoon48

Aye, low oil can definitely cause all those symptoms. The pressure sensor needs adequate oil to function correctly. Low oil means low pressure, hence the error. Slipping and grinding are common with low oil because the gears aren't getting properly lubricated. Still, you should probably take it to a workshop.

willifuchs2 (community.author)

Cheers. I checked the gearbox oil, and you were spot on – it was way low. Topped it up, and most of the problems went away, but there was still something wrong. Took it to a mechanic in the end, the pressure switch was indeed faulty and they replaced it. Cost me about 365€. Thanks for the help!

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VAUXHALL

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ASTRA