New puma 2024 having problems. No brake regen when lifting off brake pedal. No help from the 48 volt motor that helps with acceleration. Intermittent fault but had this on 2 separate cars now. Cheers

1 minute ago, grahip53 said:

New puma 2024 having problems.

First problem is update your profile.

Second problem is return car to dealer and let them sort it out.

14 hours ago, unofix said:

Second problem is return car to dealer and let them sort it out.

👍

Is it a hybrid ?  Not an 1.5 ST ?

non hybrid , non STs have been made and still available in non uk countries I believe.

Are these faults occurring at the same time?

If not, the hybrid battery may be full when the regen braking doesn't kick in.  And empty when you're not getting any hybrid boost.  Obviously if both are occurring together then there's a fault with the hybrid system which should be fixed under warranty.

Just read your post on the Puma forum, you say it previously worked so it looks like it’s back to the dealers 

 New puma only 2 months old, same thing, intermittent fault on hybrid assist, 48 volt battery showing full charge, but not giving any boost and stop/start disablabled due to engine charging? I hope ford find what is problem because puma st line is great to drive at my age. As a basic mechanic as I am, there’s a relay sticking(old school) or a sensor not reading correctly, but I have not got ford diagnostic software so hope they find answer

 

Booked car in at ford dealer for week later, next day all working fine and as worked ok since then, stopped disabling stop/start so generated/motor as to keep starting engine and using hybrid battery power, is that the answer? Cancelled booking at ford because as a mechanic I know they will say no fault found after road testing/thrashing my new car😏 by the way my puma is automatic which is great but stops you changing some settings, ie can’t shutdown hill start assist which is far to slow releasing brakes so you set off fighting the brakes which is no good for gearbox/brakes, so you have to use handbrake anyway! I love this car and with a few tweaks it would be 😌 great

My friend’s 2024 Puma in drive mode yesterday suddenly accelerated and the brake pedal didnt slow it down.  She ended up hitting the side of a house setting off all the airbags.  Anyone have any idea what might have caused this as it has really frightened her and she will have issues trusting the car again.  Although with the serious damage caused it could even be written off!

Edited October 9, 20241 yr by Colin Gardiner

I know she's going to say she didn't but she hit or caught the accelerator pedal

They don't just accelerate on their own sorry.

The manufacturer can plug into the systems and that will also show that the accelerator pedal was pressed

Is it automatic?

Has someone told her to left foot brake?

Left foot braking on automatics is the biggest cause of accidents

9 minutes ago, DaveT70 said:

I know she's going to say she didn't but she hit or caught the accelerator pedal

They don't just accelerate on their own sorry.

The manufacturer can plug into the systems and that will also show that the accelerator pedal was pressed

Is it automatic?

Has someone told her to left foot brake?

Left foot braking on automatics is the biggest cause of accidents

 

Just now, Colin Gardiner said:

 

No doubt the insurance company will require the repairer to check if anything malfunctioned on the car like tge cruise control or throttle.  She said she tried braking but nothing happened.

6 minutes ago, Colin Gardiner said:

No doubt the insurance company will require the repairer to check if anything malfunctioned on the car like tge cruise control or throttle.  She said she tried braking but nothing happened.

If you're accusing the vehicle of accelerating on it's own the manufacturer will inspect it and read the telemetry in the modules

I've been involved in a similar case before

 

The car is designed so that the brake pedal overrides the throttle pedal.  And with brakes being a 'physical' connection, braking should have had at least some effect even if the car increased the engine revs for whatever reason.

It does sound like either a genuine panic and hitting the wrong pedal, or a serious fault within the vehicle.  I certainly wouldn't want it back after that event.

4 minutes ago, TomsFocus said:

or a serious fault within the vehicle

They really don't accelerate on their own, too many fail safe's (that can be overridden by pressing the throttle pedal)

Historically the most common issue is the driver’s foot mat moves forward over the pedals if not properly secured in place.

Any malfunctions would probably stored in the onboard diagnostics

I agree with Dave that the most likely cause is driver error.

I once visited my physio and found the car park full of wrecked cars. Transpired that a customer, unfamiliar with his new auto, had misjudged the effects of "creep" and increasingly panicked, shooting to and fro across the car park.

However, with the increasing use of "drive by wire" systems there is a greater chance of an electronic "glitch" so a vehicle malfunction cannot be ruled out 100%. A quick search of "Sudden Unexplained Acceleration" brings up page after page.

As Tom says though, you would have expected braking to have some effect.

 

1 minute ago, DaveT70 said:

They really don't accelerate on their own, too many fail safe's (that can be overridden by pressing the throttle pedal)

In rare cases it could be possible.  For example, if the throttle pedal goes faulty in a very specific way, the PCM would just think the driver is pressing the pedal.  Equally, if the cruise button malfunctioned and attempted to resume back to 70mph in town, the PCM wouldn't have any reason to doubt it as a driver action.  However, both of those should have been over-ridden by a brake pedal press.

Realistically, I know how easy it is to panic when a car does something you don't expect though.  Obviously not relevant to this situation, but when I got the manual facelift Mk4 and expected it to clutch-cancel the cruise approaching a corner (as every previous car I'd approached that with did), I got a massive shock when it started aggressively accelerating towards a pedestrian on a zebra crossing a few yards around the corner.  Fortunately I did manage to hit the brake pedal quickly but it could so easily have gone wrong!  Utterly ridiculous and dangerous 'feature' to suddenly change imo but I've already made my feelings clear on that one in other threads.

If the brake system was the one with rear drums, the engine with the hybrid assistance in 1st gear would have too much torque for the brakes to be effective.

best chance to select neutral or stop engine  if this occurs

Just now, RL123 said:

If the brake system was the one with rear drums, the engine with the hybrid assistance in 1st gear would have too much torque for the brakes to be effective.

best chance to select neutral or stop engine  if this occurs

Hitting the brake pedal cancels the acceleration request (shuts off fuel)

 

2 minutes ago, DaveT70 said:

Hitting the brake pedal cancels the acceleration request (shuts off fuel)

 

That would surprise me, it should cancel the adaptive cruise control if set higher than the current speed causing it to accelerate if the vehicle in front turns away and then pressing the brakes.

 

Anyway, before you go online everywhere accusing the vehicle of accelerating of it's own accord, I would allow the manufacturer the opportunity to read the on board telemetry, which will show the status of all modules up to the point of airbag deployment.

If it comes back that it was indeed a fault with the vehicle, please come back and tell us

Also, there would be an instant safety recall if that was shown to be the case

Cruise control having been mentioned, is a thought (most Pumas have "normal" cruise not ACC). 

If cruise had been set to say 60, and cancelled, accidentally pressing "Resume" would cause the vehicle to accelerate. I've often been surprised by how strongly some cars accelerate from low speed in that situation.

 

4 minutes ago, Eric Bloodaxe said:

Cruise control having been mentioned, is a thought (most Pumas have "normal" cruise not ACC). 

If cruise had been set to say 60, and cancelled, accidentally pressing "Resume" would cause the vehicle to accelerate. I've often been surprised by how strongly some cars accelerate from low speed in that situation.

 

only above 15 MPH

2 out of the 4 pumas we’ve had had acc