P2564: Turbo Boost Control Position Sensor Circuit Low

What Does The P2564 Code Mean?

This trouble code can typically apply to all turbocharged OBDII equipped engines, but shows up more often 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 turbo boost pressure information 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 provides the PCM with the rest of the information needed for turbo boost pressure calculations. Anytime the voltage on the TBCPS sensor signal wire goes below a set 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 upon manufacturer, type of sensor and wire colors to the sensor.

What Are The Symptoms Of The P2564 Code?

Symptoms of a P2564 code may include:

• Malfunction Indicator Light On
• Poor performance
• Hesitation during acceleration
• Decrease in fuel economy

What Are The Potential Causes Of The P2564 Code?

Potential causes for this code to set are:

• Short to ground in the signal circuit to the TBCPS sensor
• Short to ground in power circuit at TBCPS sensor- possible
• Failed TBCPS Sensor – possible
• Failed PCM – unlikely

How Can You Fix The P2564 Code?

Step 1

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 put out by the manufacturer and can save you time and money during diagnosis.

Step 2

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.

Step 3

If you have a scan tool, clear the diagnostic trouble codes from memory, and see if P2564 code returns. If it does not, then the connections were most likely your problem.

Step 4

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.

Step 5

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.

Step 7

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.

Recommended Parts

Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:

>>> Twippo 372Pcs Waterproof Wire Connectors Kit
>>> KAIWEETS Digital Multimeter

Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!

Reference Sources

ENGINE CONTROL SYSTEM [GASOLINE ENGINE (V-6)] SERVICE MANUAL for P2564 – Pages 854-856.