Polo Vivo 2015 power loss EPC code P0571

[Vikingfrey]

Hey guys,

Not sure if anyone has experience with this error and knows what sensor might be playing up.

Diagnostic code P0571

Cruise/Brake switch (A) circ. Malfunction

Car is running rough on idle and lower gears seems much better on the highway at cruising speed.

[Ashveer03]

The fault code is telling u that the brake switch is faulty.

Get it tested, it's the switch on the brake pedal. U could also just have someone check if the brake lights are illuminating at the back.

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[Ashveer03]

Sometimes faulty/incorrect brake light bulbs may also cause that code.

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[Vikingfrey]

The fault code is telling u that the brake switch is faulty.

Get it tested, it's the switch on the brake pedal. U could also just have someone check if the brake lights are illuminating at the back.

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I guess what I can't understand is why that fault code caused the EPC light to come on and is affecting my power. No other fault codes have been recorded.

[Ashveer03]

Sometimes a faulty brake switch will cause intermittent loss of acceleration. Hence the EPC light.

Basically if the ECU sees that the brake is being pressed, it will stop the accelerator pedal from working - simply, u cannot press the brake and accelerator at the same time while in motion.

I don't see how that would cause rough running though, might as well see to the actual fault first before going further. Some cars have a 4 pin brake switch, some have a 2 pin switch.

With a 4pin switch it's possible that half of the switch works while the other half doesn't - the brake lights may work and signal to ECU may not or vice versa.
On a 2 pin switch, it's different. If the brake lights work, the ECU should be receiving a signal aswell.

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[Vikingfrey]

Thanks Ash. I wouldnt believe it. But I changed the brake switch. R525 from Goldwagen and the car is running like a dream.

[Ashveer03]

Good stuff

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