Citroen C5 X7 problem

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Madalin Stan
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Joined: 29 Apr 2022, 10:03

Citroen C5 X7 problem

Post by Madalin Stan »

Hello! My car (1.6 eHdi 2011, egs gearbox) started showing the error "Engine fault, repair needed" and after the car wouldn't accelerate as fast as before, to fix it I need to shut down and start the car again. Ar first I thought it was Something about the turbo, I used a diagbox and I had multiple errors( 1 that I know about because airbags are not coded, 1 for dpf and 1 for fan) but nothing for the turbo. I proceed to delete the dpf and fan ones and waited for the car to give the error again (in a 400 km drive I would have to restart the car 4 Times - so 4 errors in 400 km). After those 400 km when I arrived the fan would continue working on full speed for 5-10 minutes even If the car was shuted down and the key in my pocket and I've noticed when driving or just staying with Engine on that the fan goes full speed more often than usual. So I decided to make the 400km back home without AC and Guess what, the error didnt appear at all, the car runed perfectly. One of these days I will use the diagbox again, anyone else had this problem? What advices do You give me.
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GiveMeABreak
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Re: Citroen C5 X7 problem

Post by GiveMeABreak »

For a start, post the error codes up that you had along with your VIN if you want some help.
Madalin Stan
Posts: 5
Joined: 29 Apr 2022, 10:03

Re: Citroen C5 X7 problem

Post by Madalin Stan »

Hello! The codes are: P0494 and P0495
Vin: VF7**************[VIN obfuscated, can be read by forum staff]
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GiveMeABreak
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Re: Citroen C5 X7 problem

Post by GiveMeABreak »

Ok, so here are the official fault descriptors for your engine management system. First thing I would do is to look at the fan control unit as these can fail over time. But these should give you some pointers:
Fault Code: P0494
Description of Fault: 2 speed cooling fan : Incoherence between the reference value (low speed) and the status of the fan assembly. Incoherence between the reference value (low speed) and the status of the fan assembly (For 5 seconds).
Conditions of activation of the diagnostics: Engine running
Conditions for Fault to clear: Activation of the cooling fans unit
Downgrade Modes whilst Fault is active: -
Symptoms:
  • Engine overheating with illumination of the engine coolant temperature indicator light
  • Absence of automatic stopping of the internal combustion engine (If the vehicle has the Stop and Start system)
Suspect Areas:
  • Fan assembly
  • Fuse
  • Electrical harnesses
  • Connectors

Fault Code: P0495
Description of Fault: 2 speed cooling fan: Incoherence between the reference value (high speed) and the status of the fan assembly. Incoherence between the reference value (high speed) and the status of the fan assembly (For 5 seconds). Conditions of activation of the diagnostics: Engine running
Conditions for Fault to clear: Activation of the cooling fans unit
Downgrade Modes whilst Fault is active:
  • Activation of the cooling fan at fast speed
  • Request for immediate disengagement of the air conditioning compressor
  • Switching of the turbocharging pressure regulation to controlled mode
  • Switching to fuel "normal reduced flow" mode
  • Deactivation of the request for regeneration of the particle filter from the diagnostic tool
  • Switching on of the warning lamp and/or warning message: "SERVICE" warning lamp
Symptoms:
  • Engine overheating with illumination of the engine coolant temperature indicator light
  • Absence of automatic stopping of the internal combustion engine (If the vehicle has the Stop and Start system)
Suspect Areas:
  • Fan assembly
  • Fuse
  • Electrical harnesses
  • Connectors