Citroen C3 1.4 Fault Code P0598 What is the Cause?

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Citroen C3 1.4 Fault Code P0598 What is the Cause?

Post by DickieG »

Pretty much as per the title, my daughter's C3 1.4, 2006 41,000 miles has developed the above fault code in combination with prior/rough running when cold as in hesitation/poor performance etc. The above code relates to "Controlled Thermostat Signal short circuit to earth or open circuit" so I replaced the coolant sensor (only one temperature sensor on this car) yet the fault remains.

Using Lexia datastream readings show coolant temperature and air temperature as you'd expect them to read, cooling fan works OK when actuated via Lexia so I've run into a brick wall so to speak especially as I can't get a specific wiring diagram relating to this car. I bought a Haynes manual (bloody paperback now :roll: ) but the diagram in there shows an additional sensor which isn't fitted to this car. I've had a good look around Citroen Service using the subscription service but can't find a wiring diagram there either and as there appears to be something like 100 wires going into the the three plugs on the ECU pinning out is a complete lottery ATM. The fault wasn't there previously so something would appear to have gone wrong but what exactly is proving a mystery. I've spent several days Googling but drawn up a blank after making good use of their translation service :( Any ideas?
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Re: Citroen C3 1.4 Fault Code P0598 What is the Cause?

Post by GiveMeABreak »

Post up your VIN Dickie, I can probably help with wiring diags for you.
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Re: Citroen C3 1.4 Fault Code P0598 What is the Cause?

Post by myglaren »

Nice to see you posting again Mr G. Shame about the circumstances :(
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Re: Citroen C3 1.4 Fault Code P0598 What is the Cause?

Post by DickieG »

GiveMeABreak wrote:Post up your VIN Dickie, I can probably help with wiring diags for you.
Thanks Marc, VF7**************[VIN obfuscated, can be read by forum staff]
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Re: Citroen C3 1.4 Fault Code P0598 What is the Cause?

Post by GiveMeABreak »

In the interim whilst I'm digging these out, have a squiz at this on C3 owners:
https://citroenc3owners.com/petrol-citr ... t1871.html
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Re: Citroen C3 1.4 Fault Code P0598 What is the Cause?

Post by RichardW »

Welcome back!

These have an electric thermostat, which I'm sure has come up before as giving problems. Could be worth sticking a new one in, to see if it fixes things. Little bit pricey from Citroen....

Part Number Description Quantity Price excl. VAT Price incl. VAT Total incl. VAT Selection
00001336Z2 THERMO FITTING 48.44 GBP 58.13 GBP 58.13 GBP
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Re: Citroen C3 1.4 Fault Code P0598 What is the Cause?

Post by GiveMeABreak »

Dickie - I've emailed you the diagrams (sent one with SVGA files by mistake , then another with the PDFs)!
Here's the part Richard is referring to: Part 6
C3 Thermostat
C3 Thermostat
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Re: Citroen C3 1.4 Fault Code P0598 What is the Cause?

Post by demag »

I'm sure these manufacturers have secret development departments. "Rene, how can we screw the motorists with this vehicle?"
"Yes Claude, how about an electric thermostat?"
"We can give it a limited lifespan and charge an extortionate price for replacements."
"Excellent idea Rene."

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Re: Citroen C3 1.4 Fault Code P0598 What is the Cause?

Post by GiveMeABreak »

:rofl2: Love it - so true!

This is the third variation on a C3 today I've dealt with and just to top it all - the diagram supposedly for another member's VIN was not the same as the Water Coolant housing and Thermostat on the vehicle!
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Re: Citroen C3 1.4 Fault Code P0598 What is the Cause?

Post by DickieG »

Thanks for the help chaps, electric thermostat, what on earth is the point of that on a 1.4 C3? I could understand it on a performance car, I'm lost for words! Anyway the car is currently with my daughter who is due back later this week, after which I'll report back with my latest findings, many thanks.
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Re: Citroen C3 1.4 Fault Code P0598 What is the Cause?

Post by DickieG »

I had the opportunity to have a quick look at the car last night and yes as mentioned it does have the additional sensor on the thermostat housing located on the underside. Having never heard of such a thing I didn't notice it there, especially with the connection loom being hidden by the top hose, anyway I picked up a new one from my dealer yesterday and intend to fit it at some point this weekend, will report back once done.
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Re: Citroen C3 1.4 Fault Code P0598 What is the Cause?

Post by Hell Razor5543 »

Fingers crossed.
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Re: Citroen C3 1.4 Fault Code P0598 What is the Cause?

Post by DickieG »

Update on this issue, I fitted the new thermostat yesterday and then did a diagnostic session, whereas previously the fault was shown as permanent and wouldn't clear, with the new thermostat fitted the fault now showed as temporary then allowed me to clear it completely so hopefully it's now sorted.

I'll get the Dremel out at some point and section the housing to show how this sensor/electric thermostat works.

A big thank you to Marc and Richard for their help =D>
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Re: Citroen C3 1.4 Fault Code P0598 What is the Cause?

Post by DHallworth »

Great news you got it sorted.

Just for reference, if you pay for access to service.citroen.com, type the fault code into the search box on the top right and it'll give you a list of common causes for that code and what to check :)

I only found out when messing around when quiet at work one day. Quite interesting :)

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Re: Citroen C3 1.4 Fault Code P0598 What is the Cause?

Post by DickieG »

DHallworth wrote:Just for reference, if you pay for access to service.citroen.com, type the fault code into the search box on the top right and it'll give you a list of common causes for that code and what to check :)

I only found out when messing around when quiet at work one day. Quite interesting :)

David.
Nice one David, I wasn't aware of that.
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