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Citroen C4 Loss of Power and Cruise Control

2009 Citroen C4 Problem

Ref#21094
CarCitroen C4 1.6 HDi Picasso
Year2009
OwnerKevd34
Posted21/08/2018
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Fault usually happens when accelerating hard to get up to speed to join a motorway . I Lose power and have to scream the "nads" off it in 3rd or 4th to get to 70MPH. Also if I'm doing around 50 and go to accelerate up to 70 again I lose cruise control function as well as power until I've stopped the car and given it 5 mins to think about the error of its ways. Had it on 2 diagnostic machines and no fault found. Changed fuel filter and oil filter.
Problem Category
Running Rough, Starting & Power Loss


Solution 1
1/4drive | Auto Insider | Since: Jun 2011 | Posts: 25 | Fixes: 1859 | View Garage
Suggested Solution

"had it on 2 diagnostic machines",
Were either of them Citroen's diagnostics?
In my experience French vehicles only reliably work on manufacturers software.
So Lexia or whatever they're calling it now.


Posted on Tuesday 21st of August 2018
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From Original Poster
Kevd34 | Driver | Since: Aug 2018 | Posts: 0 | Fixes: 0 | View Garage
Suggested Solution

No. Two independent garages. I had faults read OK before at one of the garages but wasn't aware that Citroën would be as sneaky as to hide faults so only their kit would be able to diagnose.


Posted on Tuesday 21st of August 2018
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Solution 2
1/4drive | Auto Insider | Since: Jun 2011 | Posts: 25 | Fixes: 1859 | View Garage
Suggested Solution

I don't know if it's a French thing but I had a top of the line Snap on diagnostic unit on approval one time,
Very tempting despite the very 4 grand price,
Plugged it into a Renault traffic and basically all I got out was misleading crap.
Same when I tried a Peugeot.
Needless to state I returned said unit.
The Renault I used Opcom which is Vaux software but it has a feature for Renault based vans.
Good solid reliable codes so the van was diagnosed in short order.
How long it took to repair is another long story.
Bottom line is where ever possible use O/E diagnostics.
Or if you lucky enough to have a Bosch diagnostic specialist nearby the Bosch KTS system is unbeatable.


Posted on Tuesday 21st of August 2018
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Solution 3
paulieone | Driver | Since: Aug 2009 | Posts: 4 | Fixes: 1627 | View Garage
Suggested Solution

check vacuum circuit


Posted on Tuesday 21st of August 2018
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