Skip the auto shop - Our mechanics make house calls

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
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
The Traveler’s Guide to Driving in Malaysia
CraigBurrows / Shutterstock.com Malaysia is a popular destination for many tourists today. The country has amazing sights and attractions that you will want to explore....
Veteran and Military Driver Laws and Benefits in New Mexico
The state of New Mexico offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch...


Related questions

Q: Car starts hard and occasionally stalls out. Smells like gas when running.

Hello. If you have poor connections at the ignition coils then that will cause cylinder misfires. These loose connections can also shorten the life of the ignition coils. The connectors need to be replaced in order to ensure that there...

Q: My car is throwing out codes PO105 ,PO161 ,PO410 1997 Mercedes

Hello - I would agree it's not worth paying for Check Engine code extraction - you already have those. And, thanks to the Internet, we all know what component each problem code is referring to - sort of: P0105 -...

Q: P0443

Hi. There are evaporative hoses that run from the purge valve to the charcoal canister that could also have a leak in them causing the code p0443 to still be there. There also could be a problem with the charcoal...