P2046 OBD-II Trouble Code: Reductant Temp Sensor Circ Interm

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P2046 code

P2046 is a diagnostic trouble code (DTC) for "Reductant Temp Sensor Circ Interm". 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. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 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$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P2046 DIAGNOSTIC Get a fair and transparent estimate upfront

P2046 code definition

The P2046 code indicates that there has been a malfunction in the reductant injector air temperature sensor circuit.

What the P2046 code means

The reductant injector is part of the system that reduces the gas that is expelled through either the catalytic converter in gas engines, or the particulate filter in diesel engines. There are sensors in the exhaust system, used by the reductant injector to input voltage readings to the PCM. These readings allow the PCM to monitor the exhaust system operation, in particular the pressure and the temperature. If this code is stored, it means that the PCM detected that the temperature for the system was not correct.

What causes the P2046 code?

In most cases, this code is the result of corroded, burnt, or damaged wiring, connectors, or other electrical components. However, the PCM may detect an issue if:

  • The exhaust gas temperature sensor is shorted.
  • The reductant temp sensor is faulty.
  • The owner has installed an aftermarket off-road system that decreases the backpressure.
  • There is an exhaust leak.

What are the symptoms of the P2046 code?

The Check Engine light will be illuminated, and the vehicle may expel heavy black smoke when accelerating.

How does a mechanic diagnose the P2046 code?

In order to diagnose this code, the mechanic should first begin by inspecting the electrical components, and repairing any that are damaged, corroded, loose, or shorted. In many cases, this will solve the problem behind the P2046 code. After performing this task, the code should be cleared from the PCM, and the system should be retested.

If the code reappears, then the mechanic should continue with a visual inspection of the exhaust gas temperature sensors, as well as the related circuitry. A digital volt/ohmmeter may be necessary to compare the voltage reading with the manufacturer’s specifications. The mechanic should always clear the code and retest the system after each possible repair, to ensure that they’ve made the proper diagnosis. Once the faulty component is found, it should be repaired or replaced as necessary.

Common mistakes when diagnosing the P2046 code

Most often, mistakes are made when this code is misdiagnosed for a different code entirely. Oxygen sensors are often replaced instead of exhaust gas temperature sensors, for example, which does not solve the issue causing the P2046 code.

How serious is the P2046 code?

While this code won’t directly affect the drivability of the vehicle, it is still considered an important issue that should be dealt with immediately. Without the ability to properly monitor and control the exhaust system, the vehicle will not pass an emissions test. Ignoring this issue could result in larger and more expensive repairs in the future.

What repairs can fix the P2046 code?

In order to repair the cause behind the P2046 code, the mechanic may:

  • Replace faulty electrical components.
  • Replace a shorted exhaust gas temperature sensor.
  • Replace a faulty reductant temp sensor.
  • Repair an exhaust leak.

Need help with a P2046 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
P2046
Check Engine Light

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P2046 code.

SCHEDULE P2046 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(6,144)

Rating Summary
5,685
221
51
35
152
5,685
221
51
35
152

Chris

11 years of experience
13 reviews
Chris
11 years of experience
Ford F-150 - Check Engine Light is on - North Salt Lake, Utah
We were having problems with our check engine light, and Chris was exceptionally thorough until he found the problem and could help resolve the situation. We appreciate having someone who cares enough to get the job done right, not just done. We will definitely use Chris' services in the future. Thanks Chris.

Leng

21 years of experience
2 reviews
Leng
21 years of experience
Mazda MPV - Check Engine Light is on - Seattle, Washington
Leng arrived on time and explained the issue that my van is having. I will make a follow up appointment for the fix. Friendly, easy to talk to, and professional - thank you very much!

Okela

13 years of experience
11 reviews
Okela
13 years of experience
Land Rover LR4 - Check Engine Light is on - Brooklyn, New York
Okela was incredible! He is super thorough and took time to walk us through the issues with our LR4. Couldn’t recommend more! Thank you Okela!!

Robert

37 years of experience
188 reviews
Robert
37 years of experience
Land Rover LR2 - Check Engine Light is on - Atlanta, Georgia
Robert arrived on time. Did a diagnostic check quickly. He was friendly, and gave great service. He knows how to work on a Land Rover.


More related articles

Related questions

My traction control is off and half of the engine doesn't work, I hooked up a computer to it and the P0800 code is on

Hello, thanks for writing in. P0800 is the trouble code for an issue with the vehicle's Transfer Case Control system. When the transfer case control module, a computer that is separate from the engine computer, detects an issue with the...

Check engine light when running heater.

Hello, thank you for writing in. Lets discuss the codes individually. The P1166 stands for the air/fuel ratio sensor giving you false readings. This may be due to a poor wiring connection, or a failing sensor. P1167 is telling you...

Distronic plus, parktronic inoperative, pre-safe limited, ECS off during driving.

Hello, thank you for writing in. There are two possibilities that are most likely at this point. Either the run-up caused the issue, or an underlying issue caused the need for a tune-up. The best place to start is to...

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 (855) 347-2779 · hi@yourmechanic.com