Limping Hyundai Genesis Coupe

This bulletin provides information related to an ECM software update of some 2010 Genesis Coupe 2.0L manual transmission vehicles to address either of the following:

* Malfunction indicator lamp illuminated with DTC P0605 (Internal Control Module ROM Error) stored in the ECM. The vehicle may have been operating in the reduced power on limp-home mode.

* Slow rpm drop when releasing the throttle during gear shifts or on deceleration from high engine speed.

According to Hyundai, applicable vehicles include 2010 Genesis Coupe 2.0L cars at start of production to July 10, 2009.

To verify that the vehicle is affected, check the version of the vehicle’s control unit ROM ID with reference to the ROM ID information table before attempting to update the control unit software.


Model:Genesis Coupe BK 2.0

ECM P/N -- 39121-2C090

Smart key system -- YES

ROM ID -- Previous K0C0RG3A and K0C0RH2A / New K0C0RH2B

ECM P/N -- 39121-2C110

Smart Key system -- NO

ROM ID -- Previous -- K0C0MG3A and K0C0MH2A / New K0C0MH2B

After the ECM update, clear any DTCs from the control units which communicate with each other either by CAN-bus, such as ESC, ACU, TPMS and the Smart Key system (the ECM is an immobilizer type if the vehicle has the Smart Key system).


* Make sure that the vehicle’s battery has reasonable charge. If the vehicle has been in storage for days, run the engine to assure an adequate battery charge state for reliable update results.

* Turn off all lamps (do not leave the head lamp switch in auto mode) and all accessories (including heater, A/C, blower, radio, seat warmer, defroster, etc.).

* Perform the update with the ignition switch in the ON position.

* Be careful not to disconnect any cables connected to the vehicle or scan tool during the update.

* Do not turn off the ignition switch during the update.


1. Connect the power supply cable to the diagnostic terminal.

NOTE: If attempting to perform the update with the power supply cable disconnected from the diagnostic terminal, make certain that the diagnostic terminal is charged enough for the update. If not, the update may fail in progress. It is strongly recommended to connect the power supply cable to the diagnostic terminal during the update procedure.

2. Connect the USB cable between the VCI (Vehicle Communication Interface) and the diagnostic terminal.

NOTe: When performing the update using the GDS, wireless communication between the VCI and the diagnostic terminal is NOT available. Therefore, be sure to connect the USB cable between the VCI and the diagnostic terminal.

3. Connect the 16-pin DLC cable from the VCI into the vehicle’s 16-pin connector under the driver-side instrument panel.

4. Turn on the VCI and diagnostic terminal with the ignition key in the ON position. Do not start the engine.

A: Diagnostic terminal.  B: VCI.  C: USB cable.  D: Power supply cable.  E: DLC cable.
<p>A: Diagnostic terminal. B: VCI. C: USB cable. D: Power supply cable. E: DLC cable.</p>


1. Choose VIN or ECU Upgrade on the initial screen.

2. Enter the vehicle information by pressing the VIN Auto Detect button, entering the VIN or selecting the vehicle model, model year, engine/fuel type and ENGINE as the system, and then click OK.

3. Select ECU Upgrade on the initial screen after entering the vehicle information.

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