Transmission will not select gears automatically?

2007 HOLDEN ASTRA
19,688 MILES • 0.8L • 4 CYL • 2WD
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LLAB1957
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Removed the head and replaced valves and resembled. Car runs fine transmission has fluid but will not select gears automatically but will select manually. Transmission was working before I removed the head. Fuses are good.
Oct 18, 2024 at 9:32 PM
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LLAB1957
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Fuses are good.
Oct 18, 2024 at 9:34 PM
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STRAILER
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I would make sure all the of systems ground are connected, they can be left off while doing a big job like a cylinder head removal. If the grounds are all good let's run the codes to see which ones are stored, this guide can help:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please go over this guide and get back to us. Can I ask if this car has a cable running to the throttle body?

Oct 19, 2024 at 9:43 AM
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