Transponder light flashing - both keys

damadgeruk

Admin Team
The owner of the cobalt TDI I sold has been in touch to ask for help regarding transponder symbol flashing. Both keys are doing this as of this morning so unlikely to be transponder failure and more likely pickup coil or something else. He's far enough away that I can't diagnose hence any help appreciated.
 

timmus

A2OC Donor
Hello!

It sounds like a transponder pick-up coil issue me. If that's the case, the fault code appears in the instrument cluster.
I've seen this problem before and found that the coil was actually fine but that the cluster software had corrupted itself and wasn't processing the information from the coil effectively.

A temporary solution is to have the ECU sent to me such that I can disable the immobiliser. The car can then at least be driven somewhere to have the transponder coil / cluster issue sorted and the ECU immo reactivated.

Cheers,

Tom
 

damadgeruk

Admin Team
Hello!

It sounds like a transponder pick-up coil issue me. If that's the case, the fault code appears in the instrument cluster.
I've seen this problem before and found that the coil was actually fine but that the cluster software had corrupted itself and wasn't processing the information from the coil effectively.

A temporary solution is to have the ECU sent to me such that I can disable the immobiliser. The car can then at least be driven somewhere to have the transponder coil / cluster issue sorted and the ECU immo reactivated.

Cheers,

Tom
I'm hoping to save the buyer some time, might you tell me if I can plug his ecu into one of my fleet to disable the immobiliser as I haven't got around to making a gizmo. :)
 
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