Advanced Diagnostics

Advanced Diagnostics - DTC P2261: Turbocharger Bypass Control Valve Stuck Closed














General Description
When the throttle is closed during turbocharger boost conditions, the powertrain control module (PCM) opens the turbocharger bypass control solenoid valve and releases the pressure between the intercooler and the throttle body upstream of the turbocharger compressor. When the valve does not open during deceleration due to a turbocharger bypass control solenoid valve operation failure, the pressure change occurs at the turbocharger boost sensor output due to compressor surge. The turbocharger bypass control solenoid valve operation failure is judged by detecting this pressure wave with the filter.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status






Enable Conditions






Malfunction Threshold
The pulse method of releasing pressure accumulation from the turbocharger bypass control solenoid valve is 350 or more for at least 2.5 seconds.

Driving Pattern
The throttle valve fully closed deceleration from fully open acceleration at 4,500 rpm or more for at least 2.5 seconds.

- From the amount of intake air to flow through the turbocharger 120 L/min (126.8 US qt/min, 105.6 Imp qt/min) at 4,000 rpm fully open acceleration (Endurance requirement).
- Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.

Diagnosis Details

Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC and the freeze data are stored.

Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the battery.