Technical Description of OBD-II Trouble Code
The circuit for the Turbo Boost Control Position Sensor is experiencing low voltage.
What does that mean?
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 typically be found in all turbocharged OBDII equipped engines, but it is more common 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 used to fine-tune the amount of boost provided to the engine by the turbocharger.
The boost pressure sensor provides the PCM with the remaining information needed for turbo boost pressure calculations. Whenever the voltage on the TBCPS sensor signal wire drops below a certain level (usually under 0.3V), the PCM will set code P2564. 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
Symptoms of a P2564 code may include:
Causes
Potential causes for this code to appear 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 issue with a known fix provided by the manufacturer, which can save you time and money during diagnosis.
Next, locate the TBCPS sensor on your particular 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. See if they look burned or have a green tint indicating corrosion. Use electrical contact cleaner and a plastic bristle brush if cleaning of the terminals is needed. Let dry and apply electrical grease where the terminals contact.
If you have a scan tool, clear the diagnostic trouble codes from memory, and see if the P2564 code returns. If it does not, then the connections were most likely the problem.
If the P2564 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 manufacturer’s specifications; voltmeter should read either 12 volts or 5 volts. If not, repair open in 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 the open on the signal wire, or replace the PCM.
If all prior tests have passed and you continue to get a P2564, this would most likely indicate a failed TBCPS sensor, although a failed PCM could not be ruled out until the TBCPS sensor had been replaced. If unsure, seek assistance from a trained automotive diagnostician. PCMs must be programmed, or calibrated to the vehicle in order to be installed correctly.
