![]() Hissing sound coming from the turbocharger wastegate and/or turbocharger hoses.Rattling sound coming from the turbocharger and/or turbo pipes.Turbo failure caused by internal oil leaks and/or oil supply restrictions.Boost sensor reference circuit connectors that are loose, disconnected, or corroded.Boost sensor wiring that is shorted or open.Bolts between the turbocharger and exhaust manifold that are loose.When the boost pressure is higher or lower than the predetermined specifications, the PCM will store the P2261 trouble code, and the Check Engine Light will come on. Boost pressure is achieved with high RPMs, and the engine cannot operate properly if boost pressure is excessively high or low (boost pressure specifications are determined by the manufacturer and programmed into the PCM). ![]() The second chamber impeller picks up cooler air from intercoolers and the turbocharger intake system and forces dense air into the engine.įuel that is dense boosts increased horsepower, and the rise of revolutions per minute (RPM). The impeller in the first chamber then turns the impeller in the second chamber. The impeller in the first chamber turns as engine exhaust pressure is forced through it. This is accomplished when the turbocharger moves impellers that are located in two separate housing chambers. The purpose of the turbocharger is to force air into the engine in order to increase horsepower. The P2261 diagnostic trouble code is an indication that the turbo/super charger bypass valve mechanical control circuit is giving the Powertrain Control Module (PCM) a reading that is abnormal. Turbo/Super Charger Bypass Valve - Mechanical What the P2261 code means
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