P0049 OBD Error Code: Problem & Solutions

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There can be various reasons for P0049 being flashed on the PCM ranging from abnormal boost, to abnormal acceleration and deceleration. The Check Engine Light On is always the first indication for any OBD code error problem.

The OBD code is stored and flashed when the Engine Control Unit (ECU) detects an abnormal reading in the turbocharger or supercharger over speed sensor circuit.

Generally, this code is related to the circuit and sensor on the turbo/super charger which determines the actual speed of the unit.

This error indicates that the turbo/super charger is turning too fast, and the cause is usually related to the wiring or speed/boost sensor. Also, the boost control valve or wastegate may be stuck shut and need immediate replacements.

What causes the problem of Turbo/Super Charger Turbine Over speed?

• Boost pressure sensor is faulty
• Faulty turbocharger bypass valve, wastegate, or blow-off valve
• Turbocharger/supercharger mechanical failure
• Disconnected, cracked, or collapsed vacuum lines
• Turbocharger hoses are damaged/disconnected
• Electrical connectors in boost pressure sensor circuits are faulty/damaged
• Faulty PCM (Powertrain Control Module)

1. Turbocharger - Check for worn out turbochargers as they can be mechanically damaged after a particular lifespan and may require replacement. Thus, replace immediately if damaged.
2. Supercharger - Damaged supercharger will lead to decrease in the air pressure or density of air supplied to an internal combustion engine, thus affecting internal combustion. Replace damaged supercharger and parts today!
3. Diagnostic Tools - You will need high grade diagnostic tools for correction of the OBD error code which is detected. Buy now to grab amazing deals.
4. Engine Control Unit - ECU can also be faulty and transmit wrong information. If found faulty, replace it immediately.
5. Boost Control Sensor - This sensor will not be able to check for the pressure of air and won’t be able to inform the ECU with correct data. Buy new sensors form us now!
6. Electrical Connectors - Always check for worn out wiring and connectors while diagnosing this error and replace them immediately.
7. Boost Control Valve - This part is important to maintain the required air pressure and thus has to be replaced immediately, if faulty.
8. Boost Control Solenoid - If the solenoid is faulty, then it will affect the performance of the engine due to varied air pressure and fuel to air ratios. Replace it now!

Common Symptoms

• Over-boost or no boost condition, depending on the type of failure
• No power or excessive power leading to engine damage
• Check Engine Light illumination after detecting over speed condition.

Repairing for the P0049 code can be confusing, as turbo/super charger over speed can have many associated problems that are the cause. This problem is actually rare and is more accurately described as an "over boost situation".

If the bypass valve or wastegate is stuck closed, an over speed or over boost condition can exist under full load.

Mostly, this situation can be repaired by addressing a sensor or wiring issue. Also check for failing sensors, causing false output signals to the ECU.

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Always use a professional diagnostic tool to check for the error and diagnose it with the help of a professional mechanic with experience to handle the OBC code error problems.

• Check for engine warning light illuminating on the dashboard
• Uses an OBD-II scanner to check the presence of OBD Code P0049 error
• Code is reset and checked for returns

If the P0049 code returns, the mechanic should follow these test procedures:

• Examine the turbo/super charger system for faulty solenoid valve and stuck waste gate
• Check for faulty wiring and loose connections on the boost sensor/speed sensor
• Inspect the boost pressure during operation and driving for a normal range of 9 to 14 PSI pressure to insure it is not too high
• Check the turbocharger to ensure of no physical damages

Common mistakes when diagnosing the P0049 code

Inspecting the system and follow all diagnostic steps correctly to get rid of this error. Check for boost sensor and circuit anomalies and wiring problems first to avoid misdiagnoses. Most of the times the mechanic doesn’t examines all the components and goes for easy replacements, filling his pockets and not completely rectifying the error as it may flash again soon due to a faulty unattended component.