Skip the auto shop - Our mechanics make house calls

P2043 OBD-II Trouble Code: Reductant Temperature Sensor Circuit Range/Performance

Check Engine Light

P2043 code definition

Reductant Temperature Sensor Circuit Range/Performance

What the P2043 code means

This code indicates that the powertrain control module has detected a malfunction with the reductant injector air pressure/temperature sensor. This sensor is used to reduce gases or emissions that come from the exhaust.

What are the causes of the P2043 code?

Some potential causes of this trouble code may include:

  • Wiring or connectors that are associated with the exhaust temperature sensor may be damaged.

  • The exhaust temperature sensor is faulty.

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

  • The powertrain control module may be faulty.

  • A large exhaust leak upstream of the exhaust temperature sensor may exist.

What are the symptoms of the P2043 code?

Symptoms that the driver with this trouble code may experience would be black smoke coming from the exhaust upon startup and a Check Engine Light that is illuminated.

How does a mechanic diagnose the P2043 code?

A mechanic may begin diagnosing this trouble code by getting under the vehicle and visually inspecting the exhaust system. Part of this inspection would include locating the exhaust temperature sensor. Once this sensor has been located, the mechanic would then make sure that the wiring and connectors that go to it are in good condition. If so, the mechanic would then test the sensor to ensure it is working properly using the manufacturer’s recommended procedure.

Following this test would be a smoke test on the exhaust to see if any exhaust leaks exist that are not obvious. If no issues were found during this test, the powertrain control module would be tested for proper function. If any issues are found during this procedure, they would be relayed over to the customer to make a repair decision.

Common mistakes when diagnosing the P2043 code

A common mistake that can be made when diagnosing this trouble code would be replacing an oxygen sensor instead of replacing the exhaust temperature sensor. These are two separate sensors so be sure to locate the correct sensor for testing and replacement.

How serious is the P2043 code?

This trouble code is moderately serious. This code being stored for a long period of time can affect the way the engine runs. The engine will not be able to breathe efficiently with this code stored in the powertrain control module. It is recommended to have this trouble code diagnosed and repaired as soon as possible. However, since this trouble code is unlikely to cause a drivability issue, it can be put on the back burner for a short time.

What repairs can fix the P2043 code?

Repairs that can fix this trouble code would include:

Additional comments regarding the P2043 code

This trouble code may be associated with other trouble codes such as P2042, P2044, P2045, and P2056, as they are all related to the reductant temperature sensor. It is important to consider what all the trouble codes together could potentially mean. Multiple trouble codes can often assist in the diagnostic process due to the fact that codes are only set under certain parameters. If more codes exist, find out which parameter all the codes have in common and this will lead you to the faulty part.

Need help with a P2043 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

Veteran and Military Driver Laws and Benefits in Idaho
The state of Idaho offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch in the...
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...
P0477 OBD-II Trouble Code: Exhaust Pressure Control Valve Low
P0477 code means that the PCM has detected an abnormally low voltage reading often due to the exhaust back pressure control valve circuit.


Related questions

Q: Is it the part or a deeper problem when the camshaft position sensor error displays after replacement

As a technician, anytime two sensors fail at once, I suspect there is something that both these sensors have in common. This common item is the likely point of failure. It is unlikely that two sensors would fail at the...

Q: Limp mode was on and I turned off the car. Now limp mode is off but the Check Engine Light is on.

When the car goes into limp mode, generally the reason for this is related to a critical component or sensor detecting a problem that may cause serious damage. There are existing codes in the computer which have been registered as...

Q: Air bag deploying

There have been many cases of defective airbags or systems causing a fault code to be stored in the system computer. If there is a fault code stored, the air bag will not deploy because the system has been shut...