Turbocharger Boost Control Position Sensor "A" Circuit High
P2565 indicates the turbo boost control position sensor (TBCPS) circuit is reading a voltage that is too high. This sensor monitors turbocharger boost pressure and helps the engine control module regulate boost levels for optimal performance and protection.
What You Might Notice
- Check Engine Light illuminated
- Poor engine performance and reduced power
- Hesitation during acceleration
- Decreased fuel economy
- Possible turbo underboost or overboost conditions
Most Common Causes
- 1
Turbo Boost Control Position Sensor failure
The TBCPS sensor has internally failed and is sending an abnormally high voltage signal to the PCM. This is the most likely cause requiring sensor replacement.
- 2
Short to power in signal circuit
The wiring between the TBCPS sensor and PCM has shorted to a positive voltage source, causing the signal voltage to read higher than normal.
- 3
Open ground circuit at sensor
The ground connection at the TBCPS sensor or its wiring has opened, preventing proper signal return and causing voltage measurement errors.
- 4
PCM malfunction
Less commonly, the powertrain control module itself may have failed and is misinterpreting a normal sensor signal as excessive voltage.
How to Diagnose It
- 1
Check Turbo Boost Control Position Sensor failure — The TBCPS sensor has internally failed and is sending an abnormally high voltage signal to the PCM. This is the most likely cause requiring sensor replacement.
- 2
Check Short to power in signal circuit — The wiring between the TBCPS sensor and PCM has shorted to a positive voltage source, causing the signal voltage to read higher than normal.
- 3
Check Open ground circuit at sensor — The ground connection at the TBCPS sensor or its wiring has opened, preventing proper signal return and causing voltage measurement errors.
- 4
Check PCM malfunction — Less commonly, the powertrain control module itself may have failed and is misinterpreting a normal sensor signal as excessive voltage.
How to Fix It
- 1
Replace turbo boost control position sensor
Locate the TBCPS sensor on the turbocharger assembly, disconnect the electrical connector, unbolt the sensor, and install a new OEM or quality replacement unit. Verify proper torque specifications and connector seating.
- 2
Inspect and repair wiring harness
Visually inspect the TBCPS signal wire for damage, abrasion, or shorts to power. Trace the entire circuit from sensor to PCM and repair any damaged sections with appropriate wire repair or full harness replacement if needed.
- 3
Check and repair sensor ground connection
Verify the ground connection at the TBCPS sensor is secure and free of corrosion. Clean any corroded terminals with electrical contact cleaner and ensure the ground wire is properly crimped and bolted. Tighten all ground connections.
- 4
Test and reprogram PCM if necessary
If sensor and wiring test normal, use a professional diagnostic scanner to verify PCM readings and perform any necessary PCM reprogramming or replacement as directed by manufacturer specifications.
Need a deeper diagnosis?
Search for related repair guides or browse by system.