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

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P2043 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P2043 code

P2043 is a diagnostic trouble code (DTC) for "Reductant Temperature Sensor Circuit Range/Performance". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$70.00$30.00
Toyota$70.00$30.00
BMW$70.00$30.00
SCHEDULE P2043 DIAGNOSTIC Get a fair and transparent estimate upfront

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

trouble codes
Check Engine Light
P2043

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P2043 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.5/5

Number of Reviews

4,004

Rating Summary
3,661
169
45
25
104
3,661
169
45
25
104
Matthew

Matthew

30 years of experience
363 reviews
Matthew
30 years of experience
Very helpful
2000 JEEP GRAND CHEROKEE - CHECK ENGINE LIGHT IS ON - HAMPTON, VIRGINIA
Harish

Harish

24 years of experience
523 reviews
Harish
24 years of experience
Great very imformative
2002 FORD MUSTANG - CHECK ENGINE LIGHT IS ON - CHARLOTTE, NORTH CAROLINA
Michael

Michael

13 years of experience
415 reviews
Michael
13 years of experience
Friendly knowledgeable and expert timing.
2013 DODGE CHALLENGER - CHECK ENGINE LIGHT IS ON - KENNESAW, GEORGIA
John

John

16 years of experience
123 reviews
John
16 years of experience
John always is thorough in his trouble shooting and repairs. Great mechanic
1999 FORD EXPEDITION - CHECK ENGINE LIGHT IS ON - ROUND ROCK, TEXAS

More related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0121 OBD-II Trouble Code: TPS "A" Circuit Range Performance Problem
P0121 code definition Throttle Pedal Position Sensor/Switch (TPS) A Circuit Range Performance Problem...
How to Get a Louisiana Driver's Permit
s licensing program. The first step in this program is to obtain...

Related questions

Q: How many crankshaft position sensors are on a 2011 GMC Terrain?

Usually there will only be one crankshaft position sensor. However, there is also a camshaft position sensor as well. It is more likely that there is multiple cam sensors than crank sensors. It is possible for engines to have anywhere...

Q: High-pitched sounds and shuddering at the stop light, dash lights on

The problem is in the traction control system, which detected a fault and turned on the VSC and check engine light. You will need to have the system tested to see what codes were stored and then have them diagnosed...

Q: Codes showing: P0171, P0420, P0174

Hello. These diagnostic trouble codes are an indication that there could be a problem with the oxygen sensor or that there is a vacuum leak. It is possible that the vacuum leak is located in the intake manifold. These codes...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com