C3 Picasso Overheating warning

Questions specifically about a Petrol powered Citroen C3 (usually engine or fuel related problems).
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Petrol engine related faults, like injectors, error codes, overheating.
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My Name: Locomotion

Member
Posts: 2
Joined: Tue Feb 22, 2022 11:06 pm
Model: C3 Picasso
Year: 2011 (11)
Engine Size: 1.4 (16v)
Fuel Type: Petrol
Mileage: 67000
Trim Level: VTR+
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: EP3-EP3C 1.4 Vti 16v
Been thanked: 1 time

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Writing this up in case it is useful to other people.

C3 Picasso 1.4 VTR+ 2011 (petrol)
67,700 miles

Engine warning lights appeared on dash - overheating, stop engine immediately
Stopped engine. Noticed top radiator hose warm, bottom one cold. Recovered to home then driven short drive to local garage.

Replaced thermostat and radiator (because it had a leak at the bottom) - £470. Garage unable to sort electrical problem.

Engine lights still on.
OBD scan showedP023B - water pump control - short circuit to ground
P0598 - Adjustable thermostat control - short circuit to ground
P0947 - Oil pressure adjustment valve control - short circuit to ground

Harness checked - no fault found.
No power feed to ecu circuit
Traced back to fuse, found blown. Replacement fuses also blow.
Process of elimination isolated the crankcase ventilation heater shorted and causing the fuse to blow. Citroen deny this model has one. It doesn't appear to do anything so was disconnected. Fuse replaced, dash warnings gone.

200 miles later, no further faults found.

Total cost : over £800. Thanks Citroen.

Haynes autofix was no help because it has no full circuit diagram.
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My Name: Ozvtr

Moderator
Posts: 957
Joined: Wed Jul 10, 2019 3:31 am
Model: C3 2002-2005, Original shape model
Year: 2003 (53)
Engine Size: 1.4 (8v)
Fuel Type: Petrol
Mileage: 80000
Trim Level: Other
Gearbox: Automatic PRND
DPF: No
LHD or RHD: RHD
Engine name: TU3 (75 PS)
Location: Brisbane, Australia.
Has thanked: 37 times
Been thanked: 257 times

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That's a pity but unfortunately that's the way manufacturers are going today.

Look up "The farmers Vs John Deere and the 'right to fix' laws" in the U.S.

Manufacturers are now "closing shop" on proprietary information forcing you deal only with them and forcing corner repairers out of business. This allows them to charge whatever they want to repair your stuff! The closest you will ever get, is to pay for a subscription to the manufacturer for access to this information.

The circuit diagram for a PSA car is NOT available to you unless you are repairer business. It is not available to "Joe Average". It is available via a subscription to a repairer but that repairer might only need it for 1 car during the subscription period. Not good business sense for the repairer!

"The French Car Forum" asks for a 'donation' from posters who request parts information to cover the required subscription to gain the information.

At least a good fault finding technique led you to the problem. Good work.
My Name: Locomotion

Member
Posts: 2
Joined: Tue Feb 22, 2022 11:06 pm
Model: C3 Picasso
Year: 2011 (11)
Engine Size: 1.4 (16v)
Fuel Type: Petrol
Mileage: 67000
Trim Level: VTR+
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: EP3-EP3C 1.4 Vti 16v
Been thanked: 1 time

Post

Ah yes, right to repair - can't come soon enough. Circuit diagrams should be freely available - and come with the car IMO.
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