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[JamesV6CDX]

Mechanical wear and electrical gremlins are different issues. The gearbox isn't that bright

I agree. I just can’t get away from the fact that the last times I’ve seen this issue - a box replacement has solved it.

I agree it’s electrical. I’m sure of it. I say this because the fault returns after being cleared, even without the engine running.

I just think it could be something inside the box. After all many of the wires are immersed in ATF!

[JamesV6CDX]

I’d like to see this car again (and drop / look inside the sumps). It was impossible on weds due to the torrential rain.

[dave the builder]

Most Vauxhall petrol cars over fuel on start up and stink of petrol ,perfectly normal
I hope the cam sensor is a fix for your issues though 

I agree it was running slightly lumpy (although not misfiring).

I genuinely - really - want to be proven wrong, but I can’t see the cam or crank sensor (or any other minor engine imperfection) causing this TCM code

Sadly i think with the history (auto box  "someone's been here before" syndrome) It might be a box swap to fix 
BUT hopefully not

[Migalot]

I’d like to see this car again (and drop / look inside the sumps). It was impossible on weds due to the torrential rain.

You know you're welcome anytime to look inside the sump! 

[TheBoy]

P1625-02: Internal Power Control Final Stage Low Input.

P0748 -06: Unknown Error

The codes are there for a reason, use them

P0748 with a P1625 is a low current and/or open circuit to pressure solenoid


Pissing around with Cam sensor is like pissing in a force 10 wind...

[TheBoy]

And if you want to continuity check the loom, its connected to pins 5 and 52 on the ECU

[JamesV6CDX]

P1625-02: Internal Power Control Final Stage Low Input.

P0748 -06: Unknown Error

The codes are there for a reason, use them

P0748 with a P1625 is a low current and/or open circuit to pressure solenoid


Pissing around with Cam sensor is like pissing in a force 10 wind...

Thanks, J. Can you recall from memory, which one the pressure control solenoid is?

Also do you know from memory if Jpat are still selling them?

I think a resistance check across the solenoid itself followed by a continuity check is the way to go.

Can you recall what sort of resistance I’m expecting?

I’ll pop over and measure it then

[JamesV6CDX]

This box is the 4L30-E, isn’t it? (It’s been a long time since I’ve played with these transmissions and I’m rusty).

If so it seems Jpat still do all the solenoids

[JamesV6CDX]

I have sent JPAT an enquiry about solenoid availability, price and posting

[TheBoy]

Can't remember.  Given the cost of the ATF/Filter, I've always recommended replacing all of them with known good.  But genuine known good spares are probably rarer now.


Worth doing a continuity check from ECU to gearbox, as some of these are starting to get loom issues now.

[JamesV6CDX]

Worth doing a continuity check from ECU to gearbox, as some of these are starting to get loom issues now.

We have a pressure control solenoid on order in case we need it (means we are able to finish the job same day, if so)

My plan is

1) measure the resistance across the pressure solenoid (might tell us outright if it’s failed)
2) continuity check from the solenoid wires to the ECU connector

If 1 shows solenoid has failed, replace it.

If 2 shows that there is a break in the loom, try and find where, visually and with the help of Mr Multimeter!

I’m confident one way or another we will crack this

[TheBoy]

Good luck

[JamesV6CDX]

Cheers. If the gearbox is kind to us and allows it to be repaired, the car will (time depending but almost certainly) also be treated to a new cambelt kit and a full service tomorrow

[STEMO]

Don't forget the water pump 

[JamesV6CDX]

Don't forget the water pump 

Already in the boot