Technical Fiat 500x 1.0 Firefly engine code

[howiejdean]

I’m seeking advice regarding an issue with my 2021 Fiat 500X 1.0 Firefly engine.

A couple of weeks ago, the car went into limp mode and displayed fault code P06DD – Engine oil pressure control circuit performance/stuck in Off position. I cleared the code, but it quickly returned. (Revs won’t go past 3000 rpm, although overall performance doesn’t seem badly affected.)
So far, I’ve:

• Changed the oil and filter twice
• Cleared the code again (but it keeps returning)

The fault code is now showing as Permanent, although the check engine light doesn’t appear until after about 8+ miles of driving—usually around 2000 rpm. The failure is intermittent.

I took the car to my local garage (the mechanic is very good with diagnostics), and we discussed the next steps. He:

• Checked the oil pickup in the sump (it was clean)
• Ran engine cleaner through again (the oil wasn’t great, but still within mileage)
• Tested oil pressures across the rev range to monitor performance

At this stage:

• Since the fault is intermittent, I didn’t want to replace the oil pump right away
• My plan is to change the Oil Pressure Sensor next before taking it back to the garage

Has anyone experienced a similar issue with the Firefly engine oil system? Any advice would be much appreciated.


Thank you,
Howie

 

[ZaphodB]

Replacing the oil pressure sensor should be a cheap eliminate it from your enquiries part.

 

[howiejdean]

Replacing the oil pressure sensor should be a cheap eliminate it from your enquiries part.

I've ordered one already, we'll see how that goes.

 

[howiejdean]

I've ordered one already, we'll see how that goes.

Does anyone know where it is located on the firefly, with a picture? I can't see anything on the left-hand side from the front. It looks completely different to other Fiat engines.

Regards,

 

[ZaphodB]

Look around the oil filter area, usually there.

 

[howiejdean]

Look around the oil filter area, usually there.

I've managed to identify where the sensor is fitted; it is located just behind the crank pulley at the rear of the engine. To access it, you must remove the water pump bracket.