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Discussion Starter · #1 ·
Hi all,

I currently have a problem because the ESP light is up on the dash and when plugged into diagnostics, the fault code C0244 comes up. The message is - Signal from ECM invalid.

How I got here -

About two months ago I fitted a decat manifold and just disconnected the precat lambda sensor until I could get a right angled boss so it would fit (was fouling on the radiator fan). As expected, I had the engine management light come up. I wasn't however expecting the ESP light to be on continuously, but ignored it because as shortly I would have to put the standard manifold back on to pass the MOT. About three weeks ago I put the old manifold back on, and had the engine management light still on. I cleared the code with my diagnostics tool and it came back, fault codes all relating to Lambda sensor, air fuel mixture etc. (P0141, P0135, P0100). We decided it was a fault lambda sensor, so bought a new one and fitted it and these problems seem to have not come back since. The error that remains however is the ESP light. On my diagnostics tool I didn't get any errors, but when I took it to a garage and they put a proper, expensive one on they got the error C0244 as mentioned above. He seemed to think it was something to do with ABS system because it's the ESP light.

I cant imagine how anything would have broken or gone wrong because the light came up the second the other engine management light came up, it just hasn't gone since everything is now back to standard. The bloke couldn't clear this code either, is it possible any ESP related systems need recalibrating?

Just to clarify, the ABS light is NOT on. (which is why I dont think it's ABS related).

Does anyone know what could cause 'C0244, signal from ECM invalid'?

I've read that after installing a new lambda that I might need to do 40 drive cycles or 100 miles or something, but I can't do that as my MOT has now expired whilst i've been trying to get this blooming thing fixed!

Any help is REALLY appreciated, I have no idea where to go from here and can only imagine a garage will just replace things, and charge me, until the problem is fixed.

Thanks guys,

James

'05 Astra H 1.8 SRi
 

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A.O.N Assistant Regional Organiser - Scotland East
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esp/abs iirc share the same ECU but unfortunately can't be read without specialist diagnostics, and one of the things it does is brings up the esp light, so would would need to take a trip to a dealers to get the codes off the ABS ecu read.

And just because the abs slight isn;t on, doesn't mean its not effected as remember ABS and the ESP system both do the same Job, ABS is there to stop the wheels from locking while gaining control and the ESP is there to help you maintain control either under heavy braking or adverser conditions, and both run off the same ABS pump and use the same speed sensors on the wheels, so they are directly linked.

Its not un-common for the ABS pump to fail and have the ESP light on constantly.
 

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Discussion Starter · #3 ·
Thanks for the reply.

I feared you may say about the ABS pump failing. I'm sure that's an expensive repair.
However like I said, the fault only occured when I put on the decat manifold, at the same time as the EML. This makes me think that they are both related and should have gone away now it's back to standard.

I'm currently sat in the waiting room of a garage waiting on a verdict from their diagnostics. As long as they can get the light to go away long enough to do the MOT then it's happy days.



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update: They are going to try to reprogram the CIM
 

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Discussion Starter · #4 ·
In case anyone ever comes across this problem -

the CIM has been re-calibrated and all faults have gone, hooray.
 
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