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P2566 is a diagnostic trouble code (DTC) for "Turbocharger Boost Control Position Sensor Circuit Intermittent". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $79.99. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
A P2566 trouble code indicates the detection by the Powertrain Control Module (PCM) of an abnormal reading from the turbocharger boost control position sensor circuit. This trouble code is most commonly associated with a P2562, P2563, P2564, and P2565 code.
The storage of a P2566 trouble code is triggered when the PCM receives a sensor input voltage signal from the turbocharger boost control position sensor circuit that is less or greater than that specified by the manufacturer.
A P2566 trouble code is caused by a variety of problems in the air intake system of a vehicle, including a vacuum leak, dirty air cleaner, or a stuck wastegate. Other common causes of a P2566 code are loose bolts between the turbocharger and the exhaust manifold, a faulty intercooler, faulty boost sensor, defective intercooler, faulty wiring in the boost sensor circuit, a loose or damaged connector in the boost sensor, and a failure on the part of the turbo. Failure of the turbo is often associated with an insufficient oil supply to the turbocharger mainshaft, resulting in a problem with the turbo bearing, including a failure, in addition to a cracked turbo housing, and damaged impeller blades.
The symptoms of a P2566 trouble code include reduced acceleration, smoke from the exhaust, fouled spark plugs, excessive noise from the turbocharger, and higher-than-normal engine and transmission temperatures. Other common symptoms include a hissing sound issuing from the turbocharger wastegate and surrounding hoses and lowered engine performance. Some other indicators of this code are abnormal boost pressure levels, the storage of engine misfire, and knock sensor codes. The mechanic can also look for cylinder detonation caused by high engine temperatures.
In addition to an advanced scanner, to properly diagnose a P2566 trouble code, a mechanic needs a boost pressure gauge, vacuum gauge, dial indicator set, and a handheld vacuum pump. When the mechanic has gathered the tools needed, they should proceed with the diagnosis as follows:
Mechanics often make the mistake when clearing a P2566 trouble code of not clearing any debris or obstructions from the turbocharger oiling system. This, in turn, leads to an additional failure of the turbo upon clearing the code. The mechanic should also test the functioning of the turbocharger wastegate and electrical circuit to prevent further problems and turbo failure.
In addition to indicating a failure of the turbocharger, a P2566 trouble code can also show signs of increased engine temperature, lowered vehicle performance, and knocking and misfires within the engine as symptoms, affecting acceleration and overall engine horsepower. In addition, cylinder detonations associated with this trouble code can also cause engine damage.
After making a diagnosis, the mechanic should make the following repairs:
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