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P2044 OBD-II Trouble Code: Reductant Temperature Sensor Circuit Low Input

Check Engine Light

P2044 code definition

Reductant temperature sensor circuit low input

What the P2044 code means

This trouble code indicates that the powertrain control module (PCM) has detected a malfunction with the exhaust temperature/pressure sensor. This can be due to a few different things.

What are the causes of the P2044 code?

Some potential causes of this trouble code would include:

  • Wiring or pigtail ends that are in the same circuit as the exhaust temperature/pressure sensor that may be damaged

  • The exhaust temperature/pressure sensor could be faulty.

  • The powertrain control module could be malfunctioning.

  • A large exhaust leak upstream of the exhaust temperature/pressure sensor could exist.

  • An aftermarket exhaust system may have been installed that does not conform to the manufacturer’s specifications.

What are the symptoms of the P2044 code?

Some potential symptoms that a driver with this trouble code stored may experience would be a Check Engine Light and the possibly some black smoke emitting from the tailpipe.

How does a mechanic diagnose the P2044 code?

A mechanic may begin diagnosing this trouble code by visually inspecting the exhaust system. During this inspection, the exhaust temperature/pressure sensor is located. Once the sensor has been located, it will then be tested and have its circuitry checked for damages. Afterwards, the mechanic would then check the exhaust system with a smoke machine to verify the presence or absence of an exhaust leak.

If the problem has still not been diagnosed, the mechanic may then test the powertrain control module for proper function using the manufacturer’s suggested procedure. Any faulty parts that were found would be noted and relayed over to the customer at the end of the inspection to make a repair decision.

Common mistakes when diagnosing the P2044 code

Many people will often replace the oxygen sensor instead of the exhaust temperature/pressure sensor by mistake. It is very important to make sure that the right sensor is found for diagnostic and replacement purposes. It is also very important to test all aspects of the malfunctioning system to ensure that the cause is not coming from something else.

How serious is the P2044 code?

Unless black smoke is just pouring out of your exhaust everywhere you go, this code is not too serious. This is something that is possible to drive on for a short period of time until you are able to take care of the issue. However, just like any other Check Engine Light, it is best to at least get the problem diagnosed immediately, and then have it repaired at a later time.

What repairs can fix the P2044 code?

Repairs that can fix this trouble code would include:

  • Repairing or replacing wiring that is in the exhaust temperature/pressure circuit

  • Replacing the exhaust temperature/pressure sensor

  • Replacing an aftermarket exhaust system with an exhaust system that meets the manufacturer’s specifications

  • Repairing a large exhaust leak upstream of the exhaust temperature/pressure sensor

  • Replacing the powertrain control module

Additional comments regarding the P2044 code?

It is a good idea when diagnosing this trouble code to let the exhaust cool down before starting the inspection. This can help to prevent personal injury from burns.

Need help with a P2044 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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