Peugeot 406 HDi - Limp home mode
Discussion
One of the cars on our fleet has developed an intermittent problem.
The car will occasionally get itself in 'Limp Home' Mode (ie: restricted revs etc.) It normally does this at speed on the motorway, but has just started doing it in traffic, on roundabouts etc and generally anywhere bloody inconvenient or dangerous.
Obviously I can't send it out to work like it, so today it's sitting outside losing me money.
I need to get it sorted fast. So any ideas greatly appreciated.
The anti-pollution light comes on whenever the fault rears its ugly head. The car has basically been neglected for 6 years and 300,000 miles, only getting engine oil changes and cambelts. We've sent all of our cars in for a full service since taking over... Oil, Filters, Belts, Brakes, Tracking etc.
This particular car only had it's full service 2 days ago, and had a core plug and layshaft on 3rd gear replaced at the same time.
Anyone got any idea whats causing this problem, what I can check or even how to fix it? My mechanic hasn't got a clue (he's just a servicing monkey really).
The car will occasionally get itself in 'Limp Home' Mode (ie: restricted revs etc.) It normally does this at speed on the motorway, but has just started doing it in traffic, on roundabouts etc and generally anywhere bloody inconvenient or dangerous.
Obviously I can't send it out to work like it, so today it's sitting outside losing me money.
I need to get it sorted fast. So any ideas greatly appreciated.
The anti-pollution light comes on whenever the fault rears its ugly head. The car has basically been neglected for 6 years and 300,000 miles, only getting engine oil changes and cambelts. We've sent all of our cars in for a full service since taking over... Oil, Filters, Belts, Brakes, Tracking etc.
This particular car only had it's full service 2 days ago, and had a core plug and layshaft on 3rd gear replaced at the same time.
Anyone got any idea whats causing this problem, what I can check or even how to fix it? My mechanic hasn't got a clue (he's just a servicing monkey really).
SS2. said:
KingRichard said:
annodomini2 said:
You need to read the fault codes from the ECU, something is telling the ECU there is a problem, when this problem occurs a fault is logged and the resulting actions of said fault is to put the ECU in Limp Home Mode.
Is this main dealer stuff?
We had a similar issue with one of our HDi Pugs which kept dropping into LOS mode. Took it to a very reputable fuel injection specialist and they advised that Peugeot do not release the software which reads the FULL fault code. Whilst third parties can tell from a part fault code that a fault lies with the fuel injection system, for instance, the full fault code is needed to pinpoint the fault to a particular sensor or component.
Edited by SS2. on Wednesday 2nd May 11:24
Oh great
How much are diagnostics likely to cost at peugeot?
rav said:
A freind of mine has a Pug 307 Hdi that started doing this. He took it to his dealer and they told him that the fins to the diesel pump had failed and were contaminating the deisel supply. In summary he was advised to drain the system and fit a new pump. All in all they quoted £2500.
He took the car to an indie and they performed a similar repair for £1200.
Needless to say, Peugeot took no responsibility for the break up of their Diesel fuel pumps.
He took the car to an indie and they performed a similar repair for £1200.
Needless to say, Peugeot took no responsibility for the break up of their Diesel fuel pumps.
So could I get diagnostics done at Pug? Then get my tame spanner monkey to fix the problem, or are they a bit coy about twhat's involved etc...?
Don't want to pay that rate of labour for more than necessary.
SJWB said:
Firstly, if it is an emission related failure the OBD code will be read by ANY commercial or dedicated scanner. It is illegal to withold these codes.
Secondly, I doubt whether the 406 would have a particulate filter, but would suspect that perhaps the catalyst has failed - thus causing the limp home occurance.
Without the code you may never know.
Secondly, I doubt whether the 406 would have a particulate filter, but would suspect that perhaps the catalyst has failed - thus causing the limp home occurance.
Without the code you may never know.
So anyone with diagnostics should be able to pinpoint the problem?
SS2. said:
KingRichard said:
£67.50 I was just quoted. Basically an hours labour. Jesus. How much do Peugeot technicians earn? £8-9 per hour?
I know.. Its a licence to print money.
I reckon they (the dealers) have become a lot more expensive since service intervals were extended. Our older oil burners used to require servicing every 6k. With some of our fleet now having 18k service intervals, the dealer is effectively missing out on charging for two services.
I guess that charging an hour labour for a 5 minute hook up of car to diagnostic box is an example of the dealer trying to recoup its losses anyway it can..
Just going to call my other (more experienced) spanner monkey. :fingerscrossed: and find out if he has the ability to perform pug diagnostics.
I will NEVER buy another Peugeot! These bloody things are non-stop faults. Skoda's on the other hand...
The Tramp said:
may seem like a daft question, but are the brake lights working or staying on all th time??...
Not had anyone flash on the motorway or anything, so I presume not.
Update: Seems to be a valve in the Injection system that's coming up on diagnostics, and a glow plug is out. The valve section is £250 so I'd rather try the glow plug first, see if it makes the other fault less noticable.
Surely if the glow plug is out, it would be down on power and run sluggishly?
The other fault is clearly still there. We cleared the error code from the car, to see if it was a historical piece of data that was putting the car into LOS mode. Driving home last night it left me on the Hard Shoulder of the M2 for a while (it's not really fair to pootle at 30mph while your car has a hissy fit
) So I guess we need to check the code again and see if the injection fault is still listed, or if it's just a glow plug.
Thanks for all the replies so far
SS2. said:
KingRichard said:
Surely if the glow plug is out, it would be down on power and run sluggishly?
I'd have thought a duff glow plug would just make the thing harder to start. Once running, it should make no difference to performance whatsoever - and it certainly shouldn't trip the car into limp home mode.. So they don't work like spark plugs then?
I do know that a diesel ignites through compression, but I thought a glowplug helped it along a bit...
Oh no! That means it's the expensive one 
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