Technical Description of OBD-II Trouble Code
Circuit Low for Turbo Boost Control Position Sensor “B”
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 adjust 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 falls below a certain level (usually under 0.3V), the PCM will set code P2588. 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. Consult a vehicle-specific repair guide to determine which sensor corresponds to the “B” sensor in your particular vehicle.
Related turbo boost control position sensor “B” circuit codes:
Symptoms
Symptoms of a P2588 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 any scraping, rubbing, bare wires, burn spots, or melted plastic. Disconnect the connector and carefully examine the terminals inside. Check for any signs of burning or corrosion (green tint). If necessary, clean the terminals using electrical contact cleaner and a plastic bristle brush. Allow them to dry and apply electrical grease to the contact points.
If you have a scan tool, clear the diagnostic trouble codes from memory and check if the P2588 code returns. If it does not, then the issue was most likely related to the connections.
If the P2588 code does reappear, you 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’s black lead to the ground terminal of the TBCPS sensor wiring harness connector. Connect the red lead of the Digital Voltmeter to the power terminal of the TBCPS sensor wiring harness connector. Turn the 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 previous test passed, you 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 previous tests have passed and you continue to receive a P2588 code, it most likely indicates a failed TBCPS sensor. However, 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.
