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[Shackeng]

On the way to the airport last weekend, at about 30mph accelerating gently (as always ) there was a sudden jolt from the transmission, the spanner light came on, and I think it went into limp mode, as it was necessary to select first manually to get it to go decently. On arrival at airport hotel, a few miles later, I cleared the light after two restarts, and had no problems on the 90 mile return trip (although that was nearly all at 80 on motorways). The stored code is 1700 (service vehicle soon request from transmission control module) so I guess that the auto box could do with a service as it is now at 52k and 11 years old. Any comments?

[Kevin Wood]

You need the codes from the gearbox ECU ideally.

Do the lights next to the gear selector behave themselves as you shift through the positions? Not flickering or all coming on together?

Probably worth changing the fluid and filter by now anyway, but worth checking to see what the ECU is unhappy about first.

[Lazydocker]

That's odd... I think I've only ever known that code show after a flat battery/low charge moment

As Kev says... Need to check the gearbox ECU really

[Shackeng]

Thanks Kev, Paul. I'll do the service and then check again, as I assume it needs Tech2 to read the box ECU.
All the gearbox lights work normally Kevin.

[pscocoa]

I remain unconvinced that autobox service is the correct first base on this.

From experience of the fault you describe would replace crank sensor first - if it does it again then fair enough go for ATF and filter.

Kevin checked my stored codes after I had a P1700 and we got 0725 and 0730 but I had already changed crank sensor prior to his visit so to be fair the 0725 could have been unrelated but car has been steady since.

[Shackeng]

I remain unconvinced that autobox service is the correct first base on this.

From experience of the fault you describe would replace crank sensor first - if it does it again then fair enough go for ATF and filter.

Kevin checked my stored codes after I had a P1700 and we got 0725 and 0730 but I had already changed crank sensor prior to his visit so to be fair the 0725 could have been unrelated but car has been steady since.

Hmmmmm.   Thanks for that, I have a crank sensor, but I think as its due a box service, I'll do it anyway. Am I correct that stored codes should appear with pedal trick?

[TheBoy]

I remain unconvinced that autobox service is the correct first base on this.

From experience of the fault you describe would replace crank sensor first - if it does it again then fair enough go for ATF and filter.

Kevin checked my stored codes after I had a P1700 and we got 0725 and 0730 but I had already changed crank sensor prior to his visit so to be fair the 0725 could have been unrelated but car has been steady since.

The P1700 means the TCM has asked the engine ECU to reduce torque, and make driver aware.

[Lazydocker]

Pedal trick reads engine ECU only

[Shackeng]

Pedal trick reads engine ECU only

Thanks Paul, so Tech 2 rqd to read the gearbox ECU yes?

[Kevin Wood]

I remain unconvinced that autobox service is the correct first base on this.

From experience of the fault you describe would replace crank sensor first - if it does it again then fair enough go for ATF and filter.

Kevin checked my stored codes after I had a P1700 and we got 0725 and 0730 but I had already changed crank sensor prior to his visit so to be fair the 0725 could have been unrelated but car has been steady since.

The P1700 means the TCM has asked the engine ECU to reduce torque, and make driver aware.

Indeed, so it could be a multitude of gearbox issues, hence the need to read that ECU too before doing much more, IMHO.

I have also seen unrelated engine issues cause this, probably because the link between engine and gearbox ECU drops when the engine ECU gets in a tizz.

[Shackeng]

Thanks Kevin. I need to pay a visit to Alton methinks.

[TheBoy]

Ah sugar, if you do go to Alton, ask Kevin Wood to check his gauge/ecu temps...  ...I forgot 

[Shackeng]

Ah sugar, if you do go to Alton, ask Kevin Wood to check his gauge/ecu temps...  ...I forgot 

Sorry Jaime, didn't see your reply before I went down there this afternoon. However Kevin kindly spent two hours checking everything. I have a P0730 transmission code stored, so a box service is next on my list. Also a cooling fan (the rear pax side one) is not running when it should, and although Kevin did considerable trouble shooting we (well he ) could not track the problem down, other than it is almost certainly a wiring/connection problem somewhere, so this probably relates to any incorrect temp readings I have.

[Kevin Wood]

Well, not much conclusive in the gearbox ECU. P0730 Not Present. Unknown by Tech 2 and not listed in TIS.

A google suggests it's an incorrect ratio code. It drives perfectly OK and no sign of any codes or problems in the engine or ABS/TC.

I vaguely remember seeing such an unknown code in a gearbox ECU before. Might have been a 2.2 with cam sensor issues. Crank sensor routing is indicative that it might be on the original.. Nothing to suggest it might be causing problems.

There was a coolant issue, though. Temperature rose to 106 (indicated by engine ECU) before fans came on flat out. There's a break in the circuit between the thermoswitch and relay in the ECU box for the first stage fan speed somewhere.

Dash gauge was reading about 95 at this point. Will have to check mine to see if this is normal.

[Shackeng]

There are two or three examples on here previously Kevin, dating back to 2008.