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[kcl]

Well it was too long without any warning lights, almost a week! Now ABS and ESP lights came on, they went away With new start but code c0131 was stored. Any ideas?

[Vega]

code c0131 was stored. Any ideas?

Code C0131 is the pressure sensor malfunction or incorrect sign.
Check your brake switch, turn on ignition and brake, if the brake lights come on with a delay the brake switch is failing.
When braking the pressure sensor detects increase of pressure but the ecu does not sees that the pedal movement because of the failing brake switch which results in an fault code.

I did have a similar fault code because of a failing brake switch. Replacing the brake switch solves all the problems.

Peter

[kcl]

Thanks. You mean the switch by the pedal? That one is not that clever, it would not know anything about any pressure, it is only a "on - off" switch, right? So it must be inside the ABS ECU... which scares me... reading through some threads on other GM forums it seems it is related to the ECU and I'm probably needing a new one. Problem here is that my car has the "latest" ABS ECU with ESP function and I can imagine it is rare as hens teeth and a pain to get a second hand one.

Luckily this was fault has so far appeared only once, this morning it was ok.

[Vega]

Thanks. You mean the switch by the pedal? That one is not that clever

Yes that one.

, it would not know anything about any pressure, it is only a "on - off" switch, right? So it must be inside the ABS ECU... which scares me...

Pressure sensor is on the back abs unit.

reading through some threads on other GM forums it seems it is related to the ECU and I'm probably needing a new one. Problem here is that my car has the "latest" ABS ECU with ESP function and I can imagine it is rare as hens teeth and a pain to get a second hand one.

Just check the brake switch, this abs unit is better than the other ones.

Luckily this was fault has so far appeared only once, this morning it was ok.

Yes that was also my problem sometimes an error.

[kcl]

Thanks. You mean the switch by the pedal? That one is not that clever

Yes that one.

, it would not know anything about any pressure, it is only a "on - off" switch, right? So it must be inside the ABS ECU... which scares me...

Pressure sensor is on the back abs unit.

reading through some threads on other GM forums it seems it is related to the ECU and I'm probably needing a new one. Problem here is that my car has the "latest" ABS ECU with ESP function and I can imagine it is rare as hens teeth and a pain to get a second hand one.

Just check the brake switch, this abs unit is better than the other ones.

Luckily this was fault has so far appeared only once, this morning it was ok.

Yes that was also my problem sometimes an error.

Thanks for the encouragement Vega, I will source another brake switch. Does anyone know if they are the same through the range and is this "dealer only"- part or could I manage with second hand one?

[Vega]

I will source another brake switch.

Check first if it is the brake switch.
Buy a new one.