P0049 Code- Turbocharger/Supercharger Turbine Overspeed

What Does Code P0049 Mean

This code has varied definitions, depending on the manufacturer. The code is generated when the Engine Control Unit (ECU) detects an abnormal reading in the turbocharger or supercharger overspeed sensor circuit.

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Possible symptoms

• Engine Light ON (or Service Engine Soon Warning Light)

What causes the P0049 code?

Generally, the P0049 code is related to the circuit and sensor on the turbo/super charger which determines the actual speed of the unit. The fault indicates that the turbo/super charger is turning too fast, which is not a common situation, so the cause is usually related to the wiring or speed/boost sensor. Also, the boost control valve or waste gate may be stuck shut.

Troubleshooting P0049

TOOLS:

Whenever you are working with cooling system electrical components and systems, some of the basic tools you will need are:

• OBD code reader

• Multifunction Multimeter

• Basic socket set

• Basic ratchet and wrench sets

• Basic screwdriver set

• Rag/shop towels

• Battery terminal cleaner

• Wheel chalks

• Flashlight

SAFETY STEPS:

Whenever performing repairs of any kind on your vehicle, you must follow certain steps to keep you safe:

• Wear PPE (Personal protective equipment)

• Chalk wheels to prevent rollaway.

• Park vehicle on flat and level surface

NOTE: Given the location of turbocharger and sensor, make sure to let engine cool down for 10-15 minutes to let exhaust cool down. The exhaust will be extremely hot!



BASIC STEP #1:

If there are other codes present for boost pressure, it would be a good idea to diagnose those first.

BASIC STEP #2:

Go ahead and pop the hood and first locate the turbocharger. It will be paired with the exhaust manifold. You may have to search around with a flashlight in order to identify. After doing a general visual inspection, look for the turbo speed sensor typically mounted directly on the turbocharger housing. Refer to service manual for specific sensor tests and values. Often times, you will need to measure the resistance between the pins of the sensor to make sure they are within desired limits. It’s a quick way to rule out the sensor. If values aren’t within desired limits, throw it out and replace it with a new one (preferably OEM part.). Clear codes and test drive. No good? Continue to next step



NOTE: Always disconnect battery before performing any electrical repairs.

BASIC STEP #3:

Visually inspect the turbo speed sensor harness. Often times, the harness will be routed on or near the exhaust manifold/downpipe. There is a lot of heat around this area when vehicle is being driven. Exhaust heat can cause a lot of damage to these harness’. If you find any damaged or exposed wire, repair and clear codes. Test drive.

BASIC STEP #4:

Using service manual, identify harness connectors involved with turbo speed sensor circuit. Unplug and test circuits using multimeter, checking for shorts to ground or power, or opens. If anything is not within desired limits, follow specific wire(s) along the harness and repair as necessary. Clear codes and test drive. If everything is good, reconnect connectors.



BASIC STEP #5:

There is a good chance at this point that the ECM is faulty. If you feel brave, there may be a procedure in the service manual to help pinpoint. But, before doing anything crazy, bring vehicle to repair facility to further diagnose the issue. You never know, you may of missed something simple.

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