Fault code P2566 – turbocharger boost control position sensor “A” circuit intermittent/erratic

Fault code P2566 is called “Turbocharger Boost Control Position Sensor (TBCPS) “A” Circuit Intermittent/Erratic” but in different programs it may be called differently. This fault designation applies to all vehicles equipped with OBD-II.

Technical description and explained code P2566

This diagnostic trouble code (DTC) is a generic code. Error P2566 is considered a generic code because it applies to all makes and models of vehicles. Although the specific repair steps may vary slightly depending on the model.

Fault code P2566 – turbocharger boost control position sensor

The Turbo Charge Control Position Sensor (TBCPS) converts the turbocharger pressure into an electrical signal for the Powertrain Control Module (PCM). This information is normally used to fine-tune the amount of boost provided to the engine by the turbocharger.

In addition, the PCM also receives other information needed to calculate the boost pressure. Whenever there is an electrical problem with the TBCPS, depending on how the manufacturer wants to identify the malfunction. The PCM will detect this malfunction and set the code to P2566. This code is considered an electrical circuit fault only.

The control unit will also check the voltage signal from the TBCPS sensor to determine if it is correct at the original engine shutdown. This code appears due to electrical problems. For example, malfunctions in the supercharger pressure sensor circuit as well as the supercharger control position sensor.

Troubleshooting actions may vary depending on the manufacturer, type of sensor, and the colors of the wires that connect to the sensor.

Symptoms of vehicle malfunctions

The main signal that an error P2566 has occurred is the Malfunction Indicator Lamp (MIL) is also known as the CheckEngine Light.

It can also be warning signs such as:

  1. Check engine control lamp on the control panel will light up (the code will be recorded in the ECM memory as a fault).
  2. Decrease of engine power.
  3. The engine does not accelerate well.
  4. Increased fuel consumption.
  5. Black smoke coming out of the exhaust pipe.
  6. Unusual noises from turbocharger or manifolds.
  7. Whistling noises may be coming from the hoses or bypass valve.
  8. Possible detonation in cylinders.

The severity of fault code P2566 is usually moderate, but can quickly escalate to a more serious level if not corrected in a timely manner.

Factors that can cause this error code

The error code P2566 can mean that one or more of the following problems have occurred:

  • Open circuit in sensor signal circuit.
  • Voltage or ground fault in the TBCPS sensor signal circuit.
  • Voltage or ground fault on TBCPS sensor signal circuit.
  • Defective position sensor of turbocharger pressure control actuator.
  • In very rare cases, PCM transmission control module may be damaged.

How to fix or reset OBD-2 code P2566

Some suggested steps for troubleshooting and fix the error code P2566:

  1. Check sensor signal circuit, correct if necessary.
  2. Check for a ground fault.
  3. If a supply or ground fault is detected, correct the cause.
  4. If necessary, replace the faulty position sensor of the turbocharger pressure control actuator.
  5. If the PCM has failed, flash or replace it.

Diagnose and repair of problems

Locate the TBCPS sensor, it is usually screwed or bolted directly to the turbocharger housing. Visually inspect the connector and wiring. Look for scratches, scuffs, exposed wires, burn marks or melted plastic.

Disconnect the connector and carefully inspect the terminals inside the connector. Note the green tinge of oxidation or corrosion. If necessary, clean or replace the terminals or connector.

If you have a diagnostic tool, clear the diagnostic trouble codes from the memory and see if code P2566 returns. If it does not, you need to continue detecting the problem.

Next, test the TBCPS sensor and its associated circuits. With the key turned off, disconnect the electrical connector on the TBCPS sensor. Connect the black wire of the digital voltmeter to the ground terminal on the TBCPS sensor wiring harness connector.

Connect the red wire of the digital voltmeter to the power terminal on the TBCPS sensor harness connector. Turn the key to the engine on position. The voltmeter should read either 12 or 5 volts. If it does not, repair a break in the wiring in the power or ground wire, or replace the PCM.

If the previous test passes, we will need to check the signal wire. Without removing the connector, move the red voltmeter wire from the power wire terminal to the signal wire terminal. The voltmeter should now show 5 volts. If not, repair the break in the signal wire or replace the PCM.

If all previous tests are passed, but the P2566 error remains, it most likely indicates a failed TBCPS sensor. Although a failed PCM cannot be ruled out until the TBCPS sensor is replaced.

On which vehicles does this problem occur most frequently

Fault code P2566 can occur on different vehicles but there are statistics on which brands this occurs most often. Here is a list of some of them:

  • Chevrolet
  • Citroen (C4, C5, Dispatch)
  • Dodge
  • Ford (Connect, Focus, Galaxy, Kuga, Mondeo, S-Max, Transit)
  • GMC
  • Hyundai
  • Peugeot (508)
  • Toyota
  • Volkswagen (Golf)
  • Volvo (V50)

Fault code P2566 can sometimes be found with other errors. The most common are the following: P0215, P2125, P2562, P2563, P2564, P2565.


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