2009 Hyundai Verna starts for a few minutes and shuts down

The immobilizer light in the dashboard works fine when starting, then vehicle runs for 4-5 mins and shuts down.

BHPian Ashish.Dhagat recently shared this with other enthusiasts.

My Hyundai Verna 2009 SX VTVT 1.6 model (petrol) is having a strange issue. The immobilizer light in the dashboard works fine when starting, then vehicle runs for 4-5 mins and shuts down. After that immobilizer light doesnt work and vehicle doesnt start upon ignition. If I try after 4-5 hours, it again works but only for 4-5 minutes. Any help on what this could be related to? Pics attached.

Here's what BHPian SS-Traveller had to say on the matter:

Could be a variety of reasons:

  • water in fuel
  • clogged suction-end (bottom of tank) coarse filter
  • moisture in HT coil packs
  • shorted spark plug(s)
  • immobiliser faulty / not communicating with transponder in key.

Can't arrive at a definitive diagnosis without actually seeing the car.

Here's what BHPian vigsom had to say on the matter:

I'm assuming that when you turn the ignition on (not crank), you're able to see the the following:

  • Check Engine Light(CEL) - steady
  • Immobiliser light - steady and not blinking
  • Oil pressure light, battery warning light - both steady
  • Brake system light connected to handbrake and brake fluid reservoir switch - steady
  • ABS light - steady and must disappear after 2-3 seconds
  • Airbag lights - must disappear after 3-4 seconds

Both the pictures you've posted show no CEL. When the ignition is turned on

a) CEL not glowing(or glowing for a fraction of a second and immediately going off) plus

b) Immobiliser light not glowing

is most likely related to a few pins on the ECU having deposits on them, resulting in the communication going off momentarily.


  • Perform an OBD scan (it is likely that the OBD tool won't be able to read from the ECU if there is a communication issue)
  • Check the ignition fuse located in the fuse box for improper contact
  • Inspect the main relay (not sure where this is in the Verna but will most likely be in a fuse box in the engine bay)
  • Disconnect battery negative, open ECU couplers and check if all contact points are clean on the coupler side and the ECU side.

Ashish.Dhagat put in an update:

Thanks all. Found the root cause - The IC of the ECU was damaged. So, got it replaced and is working OK now. Still do not know how it got damaged. There was indeed lot of moisture in the car a day before, but that shouldn't be a reason for damaging the IC.

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