2018 mk8 1.5tdci 120 hp fiesta  shows brake applied power reduced on dash when braking but only when engine up to temp. Tick over slightly raised. Put into neutral and tick over normal. Drives fine. Any help or advice appreciated. 

On 3/7/2022 at 6:55 PM, HUDDY1960 said:

2018 mk8 1.5tdci 120 hp fiesta  shows brake applied power reduced on dash when braking but only when engine up to temp. Tick over slightly raised. Put into neutral and tick over normal. Drives fine. Any help or advice appreciated. 

Hi, did you manage to find out the cause of this problem, mines doing exactly the same?

Are you accidentally catching the throttle pedal when you press the brake?

43 minutes ago, TomsFocus said:

Are you accidentally catching the throttle pedal when you press the brake?

No, that was the first thing I made sure. It’s a strange one.

40 minutes ago, Simon7559 said:

No, that was the first thing I made sure. It’s a strange one.

I reckon there's a software fault in the PCM.  Would be worth contacting your local dealer to ask if they've heard of this issue, and if there's a PCM update available to rectify it.

Won't be free as it's not a safety recall, would expect about an hours labour to be charged.

On 2/19/2023 at 1:50 PM, TomsFocus said:

Are you accidentally catching the throttle pedal when you press the brake?

No, that was the first thing I made sure. It’s a strange one.

 

On 2/19/2023 at 3:18 PM, TomsFocus said:

I reckon there's a software fault in the PCM.  Would be worth contacting your local dealer to ask if they've heard of this issue, and if there's a PCM update available to rectify it.

Won't be free as it's not a safety recall, would expect about an hours labour to be charged.

Thank you, I’ll give Ford a ring, but it’s strange how it’s just started to happen. 62k on the clock, and never a issue before.

From here, found by googling "brake applied power reduced":

Quote

Displays if you have not released the parking brake and the vehicle speed reaches 3 mph (5 km/h).   If the warning message remains on after you have released the parking brake, the system has detected a fault that requires service.Have your vehicle checked as soon as possible.

So did you have the parking brake on? Otherwise, maybe a bad brake booster?

Hi did you find out what the issue was? Mine is doing it too? Many thanks 

On 12/17/2023 at 4:27 PM, Adam b said:

Hi did you find out what the issue was? Mine is doing it too? Many thanks 

I've got exactly the same problem  thinking vacuum leak on inlet,  or maybe throttle position sensor,  or the pedal / sensor itself.  Starting with replacing the pedal assembly tomorrow.