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DTC P2261

DTC P2261

Diagnostic Instructions


• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions provides an overview of each diagnostic category.


DTC Descriptor

DTC P2261

Turbocharger Bypass Valve Stuck

Circuit/System Description

The turbocharger incorporates a wastegate that is controlled by a pressure differential, that is determined by the engine control module (ECM) by means of a pulse width modulation (PWM) solenoid valve , in order to regulate the pressure ratio. A charge air bypass valve is integrated within the unit, and is also controlled by the ECM by utilizing a remotely mounted solenoid valve to prevent surging and damage from vibrations by opening during abrupt closed throttle conditions. When the bypass valve is commanded open during closed throttle deceleration conditions, the bypass valve allows the air to recirculate in the turbocharger and maintain speed. Within a calibrated range during the closed throttle event, or upon a wide open throttle command, the bypass valve will then close to optimize turbocharger response.

The purpose of this diagnostic is to determine if the charge air bypass valve is stuck closed. The ECM will first verify the integrity of the following sensors. The ECM then compares the actual measured mass air flow to a modeled airflow that is derived from these inputs:


• The throttle position

• Engine speed

• Intake Air (Boost) Pressure and Temperature Sensor

• Barometric Pressure (BARO)


Conditions for Running the DTC


• DTC P0101, P0111, P0112, P0113, or P0114 is not set.

• The boost pressure versus BARO ratio is between 1.1-3.2.

• The charge air bypass valve has been commanded ON for greater than 1 s immediately after an abrupt closed throttle has occurred and the resulting pressure ratio across the turbo exceeds the calibrated pressure ratio limit.

• The engine is running.

• The ignition voltage is between 10-18 V.

• The ECM has commanded the bypass valve.

• The intake air temperature is greater than 15°C (59°F).

• The DTCs run continuously when the above conditions are met.


Conditions for Setting the DTC

The ECM detects that the bypass valve is stuck in the closed position. The ECM by comparing the measured MAF to the modeled MAF has detected a series of pulsations in the induction system that exceed a calibrated threshold.

Action Taken When the DTC Sets

DTC P2261 is a Type B DTC.

Conditions for Clearing the DTC

DTC P2261 is a Type B DTC.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Turbocharger System Description

Electrical Information Reference


• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs


DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification


1. Ignition ON, check the diagnostic trouble code (DTC) information with a scan tool. DTCs P0033, P0034 or P0035 should not set.

2. If any of the DTCs are set, refer to DTC P0033-P0035 for further diagnosis.

3. Ignition ON, command the Turbocharger Bypass Solenoid Valve between Inactive and Active with a scan tool. An audible click should be heard.

4. Engine running, command the Turbocharger Bypass Solenoid Valve between Inactive and Active with a scan tool while observing the following control circuit status parameters:

• Turbocharger Bypass Solenoid Valve Control Circuit High Voltage Test Status

• Turbocharger Bypass Solenoid Valve Control Circuit Open Test Status

• Turbocharger Bypass Solenoid Valve Control Circuit Low Voltage Test Status

The parameters should alternate between OK and Not Run with each change in command.

5. Engine idling, rapidly depress the accelerator pedal from the rest position to the wide open throttle (WOT) position and release pedal. A valve that is stuck shut will generate an unusual pulsating noise. Compare to similar vehicle. There should not be any unusual noise.

6. If there is unusual noise, refer to Turbocharger Cleaning and Inspection .

7. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.


Circuit/System Testing


1. Inspect for any damage, restrictions, improper routing or connecting of the vacuum hoses on the charge air bypass solenoid valve and the charge air bypass valve.

2. If a condition is found, repair as necessary.

3. Clear the DTC and operate the vehicle within the Conditions for Running the DTC.

4. If the DTC cannot be cleared or continues to reset, replace the charge air bypass valve.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Turbocharger Disassemble

• Control Module References for ECM replacement, setup, and programming