Hyundai Tucson, Santa Fe and Kia Sorento SIM2K-341 Immo Off Dumps (2.0/2.4 GDI)

Hyundai Tucson 2.0 GDI, 2017, a warranty ECU swap done years ago by a dealer, and now the second ECU has died with no comms after a jump start from a van. A used ECU turns up with 39135-2G020 on the label. The car will crank and not run, because the used Continental SIM2K-341 is married to the Smartra or smart key module of the donor. On a diesel you’d ask for a virgin; on this GDI unit the file that reliably gets the car moving is immo off, and there are a couple of things to check before you order it.

Which cars

SIM2K-341 is Continental’s controller for the Theta II 2.0 and 2.4 GDI in the Hyundai Tucson, Santa Fe and Sonata and the Kia Sorento, Sportage and Optima, mostly 2014 onward. The 2.0 MPI in the same cars runs a different SIM2K, and the older Elantra runs SIM2K-241; the Hyundai and Kia brand pages separate them.

Numbers to match

The label carries two 39xxx-2Gxxx numbers on most (hardware and software), sometimes a 6T330 Continental number, and a long calibration string. Examples from stock:

• HYUNDAI TUCSON SIM2K-341 39135-2G020 39105-2G020 692F0L0000000 IMMO OFF DUMP
• HYUNDAI TUCSON SIM2K-341 39136-2G200 39106-2G200 IMMO OFF DUMP
• HYUNDAI TUCSON SIM2K-341 6T330-KR822252 S02 KR82225402 IMMO OFF DUMP
• HYUNDAI TUCSON SIM2K-341 39136-2G813 6T330-KR822252 S02 KR82225402 DUMP
• HYUNDAI SANTAFE SIM2K-341 39134-2G332 39104-2G332 692G0Q0000000 IMMO OFF DUMP
• KIA SORENTO SIM2K-341 39133-2G190 39103-2G190 691F0L0000000 IMMO OFF DUMP

Match the first 39xxx number exactly. The second one (39105, 39106, 39103) is the software and can differ by market and year; if yours isn’t listed, send your own read and we patch that.

Smartra vs smart key

On a turn-key Tucson or Sorento, the Smartra module reads the transponder and passes a code to the ECU; the ECU holds the pairing. Immo off in the ECU removes that pairing check and the car starts with any key that turns the barrel. On a push-button car, the smart key module (SMK) and the PDM control power and the start request, and the ECU still gets a code from the SMK. Immo off in the ECU means the ECU stops caring about that code, but the SMK still has to see a registered fob to switch the car on and allow cranking. So on smart key cars immo off fixes a mismatched ECU; it doesn’t fix a lost fob. For lost fobs you’re still on GDS/KDS or a locksmith tool.

Reading the ECU

SIM2K-341 is a Tricore-based Continental unit with TPROT on most versions. Read options:

1. OBD with KESS V2, KESS3 or PCM Flash on supported software. Fast, no dismantling, and fine for a stock file or a remap. On most versions it doesn’t return the area we need for immo, so treat it as a backup read.
2. Bench or boot mode with KTAG, FoxFlash, KT200 or New Trasdata. Full flash and EEPROM. This is what to send for immo off.

If your tool offers a virgin option for this ECU, be careful: on the GDI SIM2K-341 a virgin state still needs GDS/KDS to complete the Smartra learn, and the learn fails on a good number of used units. Immo off doesn’t have that dependency.

What went wrong on the bench

• Read fine, wrote fine, still no start. The car was a smart key Santa Fe and the SMK had a stored fault from the jump start. The ECU was never the whole problem. Cleared with KDS, started first time.
• Tool showed a checksum error after writing immo off. The write was done over OBD after a bench read. Different tools, different write maps. Write the same way you read.
• Immo off worked, engine light on, P0630. The used ECU carried the donor’s VIN. That’s a VIN write in KDS, not a file issue. The customer’s inspection station would have caught it.
• ECU dead after the write. Bench supply dropped under 12V during the flash. This unit needs a stable supply; a workshop charger on a decent battery, not a plug-in bench PSU on its last legs.

Get the file from the SIM2K-341 page or the immo off category, or send the bench read with a label photo through the request form and tell us whether the car is turn-key or push-button.