I'd start here
P0605:
Possible causes
- Engine Control Module (ECM) may be faulty
- ECM harness power supply circuit is open or shorted
- ECM harness ground circuit is open or shorted
Tech notes
Try erasing the code first, if the light comes back ON you may have to replace the ECM to repair the problem.
The Engine Control Module (ECM) continuously monitors its own internal memory status, internal circuits, and output signals transmitted to the throttle actuator. This self-check insures that the ECM is functioning properly. If any malfunction is detected, the ECM sets the P0605 code and illuminates the MIL.
P1233:
Possible causes
- Faulty Electric Throttle Control (ETC) Actuator
- Electric Throttle Control (ETC) Actuator harness is open or shorted
- Electric Throttle Control (ETC) Actuator circuit poor electrical connection
Electric Throttle Control Actuator consists of throttle control motor, throttle position sensor, etc. The Throttle Position (TP) sensor responds to the throttle valve movement.
The throttle position sensor has the two sensors. These sensors are a kind of potentiometers which transform the throttle valve position into output voltage, and emit the voltage signal to the Engine Control Module (ECM). In addition, these sensors detect the opening and closing speed of the throttle valve and feed the voltage signals to the ECM. The ECM judges the current opening angle of the throttle valve from these signals and the ECM controls the throttle control motor to make the throttle valve opening angle properly in response to driving condition.
P1238:
Possible causes
- Faulty Electric Throttle Control Actuator
- Throttle plate sticking due to carbon build-up
- Electric Throttle Control Actuator harness is open or shorted
- Electric Throttle Control Actuator poor electrical circuit connection
Electric throttle control actuator consists of throttle control motor, throttle position sensor, etc. The throttle control motor is operated by the Engine Control Module (ECM) and it opens and closes the throttle valve.
The throttle position sensor detects the throttle valve position, and feeds the voltage signal to the ECM. The ECM judges the current opening angle of the throttle valve and controls the throttle valve opening angle in response to driving conditions via the throttle control motor.
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