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(Post Link) post #1 of 3 Old 08-04-13 Thread Starter
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156 2.0 JTS 2005

Help Help unrecognised fault code

I have recently had a replacement engine fitted to my 2005 156 2.0 JTS after a cambelt failure.
The engine warning light and motor control system failure warning flashes when the engine is started so the (not alfa specialist) mechanic plugged in his fault code reader to be given a code which was not recognised. The code is 05744. there is a slight loss of engine performance, but this could be due to a blowing exhaust.

The mechanic is on holiday for 2 weeks so I thought I'd give him a helping hand by trying to find out what this means as he did not know. I called my local Alfa dealer and they had not heard of this code and suggested I brought the car to them so they could plug their reader in (for 45).

Please does anyone know what this could be?

I thought maybe the lambda sensor, but this should have a recognised code, right?

Thanks for your help in advance

Will Gant
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Hmmm, well I'm not sure about 05744 but the ODB II- P0574 is a generic code on the Fiat system for.... Cruise control system -Vehicle speed too high

It's the closest match, sounds like the original mechanic was using an old ODB scanner and not an ODB II

Have you a cruise control stalk actually fitted? If so it could be a loose connector or brake light switch.

Personally I wouldn't say it is related to your running issues but a blowing exhaust will certainly have a bearing on performance

Moral of the story is:
Try not to totally rely on just code reading....
Go with simple methodical and logical mechanics and rectify what you "know" to be at fault first....
If that rectifies the running issue, then read the codes and clear them or you will simply end up worrying needlessly about non discript codes and end up chasing ghosts in the system which cost you money (45 a time) when it ends up being unrelated mate ok.
Hope you get it sorted

P0574 Cruise Control System - Vehicle Speed Too High

OBD Code P0574 refers to:
When the brake pedal is depressed, the stop light switch sends a signal to the ECM. When the ECM receives this signal, it cancels the cruise control. A fail safe function is provided so that the functions normally, even if there is a malfunction in the stop light signal circuit. The cancel condition occurs as battery positive voltage is supplied to terminal STP.
When the brake is on, battery positive voltage is normally applied through the STOP fuse and the stop light switch to terminal STP of the ECM, and the ECM turns the cruise control OFF. If the harness connected to terminal STP has an open circuit, terminal STP will have battery positive voltage and the cruise control will be turned OFF.
Symptoms of OBD code P0574
- Engine Light ON (or Service Engine Soon Warning Light) - Cruise control system inoperative
Possible causes of OBD code P0574
Miss-adjusted brake switch - Brake switch open or short circuit - Poor brake switch electrical connection - Failed brake switch The Error code is generally activated on detection of the following conditions: The P0573 codes is set when there is a malfunction with the cruise control system.
(Post Link) post #3 of 3 Old 08-04-13 Thread Starter
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Join Date: Apr 2013
Location: United Kingdom
County: Norfolk
Posts: 7

Member car:

156 2.0 JTS 2005

Thanks for the reply. I had already found the fault code P0574, but as I don't have cruise control ruled it out. the mechanic says his code reader has 2010 info on it so should be able to read my 2005 ecu. His answer to the problem will be to go through the engine electrics when he comes back from holiday and find the fault that way, also as you suggested.

It has been a really expensive and drawn out job so I hope he can find the problem!
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code , ecu , engine error lamp , fault , faultcodes , unrecognised

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