Car Mechanics (UK)

Trac­tion light

- Nick Abel KIA Motors · Austria · Iceland · Belgium · Kia Pro cee'd

The trac­tion con­trol light on my 2012 Kia Ceed 1.6 diesel comes on at ex­actly 47mph; the light goes off out­side of this speed range. I’ve read the codes with an Au­tel MOT PRO V6.1 and there is a his­toric code: ‘CL520 clutch switch er­ror’. There are no drive­abil­ity prob­lems when the light is on.

I also have an­other prob­lem which is that the car drives well, but oc­ca­sion­ally suf­fers from a hes­i­ta­tion. It feels as if your foot has slipped of the ac­cel­er­a­tor. It is also some­times dif­fi­cult to start. The fuel fil­ter has been changed and in­jec­tor cleaner ad­di­tive put into the fuel tank, to no avail. For this fault, would it be a good idea to read the fuel pres­sure on the live data?

There is a pos­si­bil­ity that the two prob­lems are re­lated. When the trac­tion con­trol comes on it will re­duce the power to the en­gine. How­ever, as you say there are no drive­abil­ity prob­lems when the trac­tion con­trol light comes on, this may not be the case.

The code ref­er­enc­ing the clutch switch er­ror may not be re­lated and could just be a his­toric code. The best way to check if this is a prob­lem would be to clear the code and see if it re­turns. If it does, the clutch pedal switch should be checked. The er­ror oc­curs when the en­gine con­trol mo­d­ule (ECM) does not de­tect the clutch op­er­a­tion at the ap­pro­pri­ate times. The code num­ber for this er­ror should be ‘P0704’.

Pro­vided no prob­lems are found with the clutch pedal switch, the most likely source of the prob­lem is a wheel speed sen­sor. These are incorporat­ed into the ABS and trac­tion con­trol sys­tems. The sen­sor de­tects the speed of each wheel and sends the in­for­ma­tion to the ECM. Some sys­tems can be sen­si­tive and can be up­set if the tyre pres­sures are in­cor­rect or the tyres are un­evenly worn.

After check­ing the sen­sors are clean and in place, use your Au­tel MOT PRO V6.1 to track the op­er­a­tion of the ABS sen­sors while driv­ing, to en­sure they are all sup­ply­ing the same read­ing. If one of the sen­sors is out of bal­ance, I would check the con­nec­tions and the pick-up. If no fault can be found here, I would sus­pect the sen­sor has failed.

The hes­i­ta­tion prob­lem may be a sep­a­rate is­sue and, as you sug­gest, using the live data to check the fuel pres­sure stability while driv­ing would help to high­light any is­sues.

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