Technical Description of OBD-II Trouble Code
Circuit High for Turbo Boost Control Position Sensor
What does that signify?
This diagnostic trouble code (DTC) is a generic powertrain code that applies to OBD-II equipped vehicles with a turbocharger (Ford, GMC, Chevrolet, Hyundai, Dodge, Toyota, etc.). While it is a generic code, the specific repair steps may vary depending on the make and model of the vehicle.
This trouble code can generally apply to all turbocharged OBDII equipped engines, but it is more commonly found in certain Hyundai and Kia vehicles. The Turbo Boost Control Position Sensor (TBCPS) converts the turbo boost pressure into an electrical signal for the Powertrain Control Module (PCM).
The Turbo Boost Control Position Sensor (TBCPS) provides additional information about turbo boost pressure to the Powertrain Control Module or PCM. This information is typically used to fine-tune the amount of boost provided to the engine by the turbocharger.
The boost pressure sensor supplies the PCM with the remaining information required for turbo boost pressure calculations. Whenever the voltage on the TBCPS sensor signal wire exceeds a certain level (usually over 4.8V), the PCM will set code P2565. This code is considered to be an electrical circuit fault only.
Troubleshooting steps may vary depending on the manufacturer, type of sensor, and wire colors connected to the sensor.
Symptoms
The symptoms of a P2565 code may include:
Causes
Possible causes for this code to be set are:
Diagnostic and Repair Procedures
A good starting point is always to check for technical service bulletins (TSB) for your particular vehicle. Your issue may be a known problem with a known solution provided by the manufacturer, which can save you time and money during diagnosis.
Next, locate the TBCPS sensor on your specific vehicle. This sensor is usually found directly screwed / bolted into the turbocharger housing. Once located, visually inspect the connector and wiring. Look for scraping, rubbing, bare wires, burn spots, or melted plastic. Pull the connector apart and carefully inspect the terminals (the metal parts) inside the connector. Check if they appear burned or have a green tint indicating corrosion. If necessary, use electrical contact cleaner and a plastic bristle brush to clean the terminals. Let them dry and apply electrical grease where the terminals make contact.
If you have a scan tool, clear the diagnostic trouble codes from memory and see if the P2565 code returns. If it does not, then the connections were most likely the problem.
If the P2565 code does return, we will need to test the TBCPS sensor and its associated circuits. With the Key Off, disconnect the electrical connector at the TBCPS sensor. Connect a Digital Voltmeter black lead to the ground terminal at the TBCPS sensor wiring harness connector. Connect the red lead of the Digital Voltmeter to the power terminal at the TBCPS sensor wiring harness connector. Turn Key On Engine Off. Check the manufacturer’s specifications; the voltmeter should read either 12 volts or 5 volts. If not, repair any open wiring on the power or ground wire, or replace the PCM.
If the prior test passed, we will need to test the signal wire. With the connector still disconnected, move the red lead of the voltmeter from the power wire terminal to the signal wire terminal. The voltmeter should now read 5 volts. If not, repair any open wiring on the signal wire, or replace the PCM.
If all prior tests have passed and you continue to get a P2565, this would most likely indicate a failed TBCPS sensor, although a failed PCM cannot be ruled out until the TBCPS sensor has been replaced. If you are unsure, seek assistance from a trained automotive diagnostician. PCMs must be programmed or calibrated to the vehicle in order to be installed correctly.
