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Mark
Mark, Technician
Category: Car
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Experience:  Qualified City & Guilds
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ESP light is illuminated with the ESP switch OFF, what is the

Resolved Question:

ESP light is illuminated with the ESP switch OFF, what is the likely fault? I suspect it maybe the ABS pump
Submitted: 3 years ago.
Category: Car
Expert:  Mark replied 3 years ago.

Mark :

Hello, my name is XXXXX XXXXX I will try help you with this.

Mark :

It is more likely to be a sensor fault rather than the ABS pump.

Mark :

Does the ABS light come on?

Mark :

The easiest thing to do is connect a suitable scan tool to read the code from the fault memory.

Mark :

This will help where you start looking for the fault.

Customer:

The ABS light is not on, just the ESP light on the dash, the ESP switch is not illuminated.

Mark :

Then I don't think it will be the ABS pump

Mark :

What made you think it was?

Customer:

What sensor do you think it could be?

Mark :

That's why you need the scan tool.

Mark :

It could be the steering angle sensor, a wheel speed sensor, damaged wiring etc.

Customer:

I had the brake fliud replaced in december, is it possible that this may be effecting the sensor

Mark :

No

Customer:

Can you explain why you dont think it is the ABS pump? (so I have a bit of amunition when I take it to the garage for an inspection)

Mark :

Is the ABS light on?

Customer:

No

Mark :

Does it come on with ignition and then go out?

Customer:

It comes on and stays on.

Mark :

Until you start the engine and then goes out.

Customer:

No the light is on with the engine running

Mark :

The ABS light

Customer:

the ESP warning lamp

Mark :

I'm asking you about the ABS light

Customer:

the ABS light goes out when the engine is running

Mark :

Then there is no fault in the ABS system.

Mark :

What engine do you have?

Customer:

Its a bit confusing because the owners manual states 'it will also come on (ESP light) if a fault should occur in the ABS because the ESP operates in conjuntion with the ABS'.

Customer:

2.0 ltr 105 ps

Mark :

But there are two distinct systems that talk to each other.

Mark :

That's why there are two lights

Mark :

You can lose the ESP but still have ABS in an emergency.

Customer:

I understand that it is a common fault (ABS pump failure) with VW seat etc with the ESP light staying on and wanted a second opinion about it. I dont want the garage to turn round and say straight away that it is the ABS pump.

Mark :

That's why it is best checked with a scan tool to see what code is stored.

Mark :

It could be a communication error between the systems.

Customer:

Ok Mark thanks for your help I will get a diagnostic done on it. Regards Richard

Mark :

Sometimes you find that just by clearing the code the system is ok and no other work is required.

Mark :

No problem Richard.

Mark :

Please remember to rate my assistance.

Mark :

Thanks.

Mark :

Mark.

Customer:

Will do :)

Mark :

:)

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