Limp mode

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cratcliffe17
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Limp mode

Post by cratcliffe17 » Fri Jan 12, 2018 9:23 am

Had my auto 120d e82 coupe remapped last week, wanted a conservative, smooth map, now running 199bhp and 310ft torque. (was 166bhp & 250ft) pulls so much better throughout the gears made a huge difference.
Drove it for an hour on the motorway to work yesterday, no issues, 50 minutes into the return journey home and still running fine, no issues,accelerating nicely when putting my foot down a bit, then when just gently accelerating from 70>75 at around 2k revs limp mode kicked in.

Taking the car back into the mapper this weekend to take a look at it, but wanted to see if anyone on the forum had any advice or insight into if this is a common problem or typically what could cause this?

Car is completely stock bar the map, any advice would be greatly appreciated, i'm confident the mapper can sort it this weekend but just thought i'd see if you knowledgeable lot have any insights :)
Thanks in advance

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marco_polo
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Re: Limp mode

Post by marco_polo » Fri Jan 12, 2018 9:32 am

Could be almost anything from what you've said. What are the error codes from the OBDII port please?
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Re: Limp mode

Post by cratcliffe17 » Fri Jan 12, 2018 9:41 am

thanks for the quick response.
Unsure at the moment, i'll have to wait until i can take it into the mapper tomorrow and he can plug his OBD reader in.
i did think it'd be a bit of a daft question without being able to get the codes / look at the car just didn't know if there was a common issue that caused it to kick in.

Hopefully once they've had a look at the codes on the OBD reader it's an easy fix

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Re: Limp mode

Post by marco_polo » Fri Jan 12, 2018 9:42 am

Was it a good quality remap, or did they increase the fuel pressure?
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cratcliffe17
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Re: Limp mode

Post by cratcliffe17 » Fri Jan 12, 2018 9:48 am

I am assuming good quality, based on the same company has mapped a lot of friends cars which have all ran brilliantly for months and months without a single hiccup.
I will check tomorrow what exactly was amended on the ECU for the map. I know boost pressure was increased but not 100% sure about fuel pressure.

I am assuming fuel pressure = bad?

(apologies for my lack of insight at the moment, understand it's complete guess work until i get it back into the garage)

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Re: Limp mode

Post by marco_polo » Fri Jan 12, 2018 9:51 am

Increasing the fuel pressure has resulted in lots of limp modes on dodgy diseasil remaps (123d's in particular).
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Re: Limp mode

Post by cratcliffe17 » Fri Jan 12, 2018 9:55 am

Ah okay interesting,
Will report back tomorrow after I've taken the car in. Confident in the mapper so fingers crossed it's a quick fix!

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Re: Limp mode

Post by cratcliffe17 » Sat Jan 13, 2018 5:19 pm

Had the map tweaked today but unfortunately the car went back into limp mode when accelerating upto 60mph still.
Think the OBD gave error codes: 4C2F, 4C2E, 4C29, 4D7F, 4CAF. (but the reader just gave message 'ECU internal error' which didn't tell them much.

Next plan is to take the car back to standard and see if limp mode still kicks in. Idea here is to see if it's mechanical or the map.

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Re: Limp mode

Post by marco_polo » Sat Jan 13, 2018 5:23 pm

This post seems to suggest it's been remapped by a retard: viewtopic.php?t=50658

viewtopic.php?t=66976

viewtopic.php?t=66929
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Re: Limp mode

Post by jason@bwchiptune » Sat Jan 13, 2018 9:39 pm

With them codes I would say 100% it's the remap that is causing the problem of going into limp

Don't change any parts on your car and make sure it's put back to stock by having the software updated by a bmw specialist

It's very odd as you would really have to push these 177bhp 120d to over 240bhp to normally get these to go into limp

For yours to only be making 299bhp and 310ft and going into limp they must of done something seriously wrong to the mapping of the ecu

I get loads of calls about these problems and these codes every week
And I've fixed many Remaps by other tuners that have caused this problem if you search the bmw forums

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