P0846 OBD-II Trouble Code: Transmission Fluid Pressure Sensor/Switch "B" Circuit Range/Performance

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

SCHEDULE P0846 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0846 code

P0846 is a diagnostic trouble code (DTC) for "Transmission Fluid Pressure Sensor/Switch "B" 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. 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 P0846 DIAGNOSTIC Get a fair and transparent estimate upfront

P0846 code definition

The P0846 refers to a detected malfunction relating to the vehicle's transmission fluid pressure sensor circuit.

What the P0846 code means

The P0846 trouble code indicates that the Powertrain Control Module (PCM) has detected an anomalous fluid reading from the transmission system. The transmission system uses hydraulic fluid to regulate features like torque converter lockup and gearshift actuation. If the sensor circuit sends a fluid pressure reading to the PCM that falls outside manufacturer specifications, the P0846 trouble code will be stored.

What causes the P0846 code?

The cause of a P0846 trouble code may lie with a faulty component relating to the transmission, most commonly the faulty electronic pressure control solenoid or transmission fluid pressure sensor itself. Low, decontaminated or dirty transmission fluid may be to blame as well.

What are the symptoms of the P0846 code?

At its worst, the P0846 will disable the transmission and torque converter clutch. his will render the vehicle inoperable. Most instances, however, are less severe, usually resulting in harsh shifting and shift slippage, overheating transmission and lowered fuel efficiency. The vehicle's onboard computer will store a P0846 trouble code and signal the trouble lamp on the car's dashboard.

How does a mechanic diagnose the P0846 code?

A P0846 code can be first identified by using an ODB-II code reader. The transmission fluid pressure sensor circuit should be inspected thoroughly for apparent issues. Any related wiring should be checked in case there are issues with disconnected, corroded or faulty circuits. The transmission fluid itself should be checked for signs of issue, both visually and with use of a dipstick. Contaminated, burned, dirty or otherwise problematic transmission fluid may be a sign of other issues with the transmission system.

Common mistakes when diagnosing the P0846 code

Mechanics report that the wiring, circuitry, hydraulic blockages, transmission fluid, and transmission fluid pressure sensor itself are overlooked in favour of the transmission's pressure pumps.

How serious is the P0846 code?

In the worst instances, the vehicle will be rendered inoperable by a P0846 code. Moderate cases may negatively affect the vehicle's drivability. In any case, a P0846 trouble code is a potentially serious issue, and should be addressed as soon as possible.

What repairs can fix the P0846 code?

Any faulty, damaged or disconnected circuits and connectors should be repaired or replaced. Burned, dirty or contaminated transmission fluid will need to be replaced. If there is a shortage of transmission fluid, it should be topped up accordingly. In rare instances where the PCM itself is faulty, it will need to be replaced and the related modules reprogrammed as needed. This should be saved as a last ditch option however, as the process is costly and time-consuming.

Additional comments for consideration regarding the P0846 code

If the trouble code returns and the transmission system has been fixed, check the voltage and suspect an electrical circuit problem. Other trouble codes related to the torque converter clutch and transmission system often come alongside a P0846 code.

Need help with a P0846 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 1-800-701-6220.

trouble codes
P0846
Check Engine Light

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

SCHEDULE P0846 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

4.8/5

Number of Reviews

4,796

Rating Summary
4,411
187
47
28
123
4,411
187
47
28
123

Matthew

31 years of experience
633 reviews
Matthew
31 years of experience
Mercedes-Benz E320 - Check Engine Light is on - Williamsburg, Virginia
MATT WAS AMAZING! HE EXPLAINTED EVERYTHING SO WELL! HIS EXPERTISE AS A MECHANIC IS EVIDENT AND I HIGHLY RECOMMEND HIM.

Mario

18 years of experience
101 reviews
Mario
18 years of experience
Lexus LS430 - Check Engine Light is on - Naples, Florida
NICE GUY, COMPLETED ALL WORK PROFESSIONALLY, HE ACTUALLY OFFERED SUGGESTION AND ATTITUDE WAS THAT HE CARED UNLIKE PAST MECHANIC

Kai

12 years of experience
3 reviews
Kai
12 years of experience
Hyundai Sonata - Check Engine Light is on - Plano, Texas
Great. He was knowledgable and wasted no time getting to work. Had lots of helpful information for me

Patrick

31 years of experience
1038 reviews
Patrick
31 years of experience
Mazda CX-7 - Check Engine Light is on - Austin, Texas
Patrick is always on time and extremely knowledgeable and professional. I am quite picky when it comes to somebody working on my car and I fully trust that Patrick will do an excellent job every time.

More related articles

OBD-II Trouble Code P0688: ECM/PCM Power Relay Sense Circuit/Open
P0688 means there is an output circuit issue in the power relay sense circuit, likely due to a damaged or defective ECM relay or faulty wiring.
P0224 OBD-II Trouble Code: Throttle/Pedal Position Sensor/Switch B Circuit Intermittent
P0224 P0224 Code Definition Throttle/pedal position sensor/switch B circuit intermittent is the technical definition of this trouble code. What the P0224 code means The P0224 code means that the powertrain control module (PCM) is detecting intermittent voltage readings from...
P0699 OBD-II Trouble Code:Sensor Reference Voltage “C” Circuit High
P0699 means a fault in the sensor reference C circuit, which also affects the alternative fuel, body, anti-lock brake, and other control modules.

Related questions

My vehicle runs or idles rough. I was told that is normal, is it? And what are the signs of the transmission going out?

With a vehicle as new as yours, the likelihood of a transmission issue would be fairly slim unless damage has been done. The clanking and the rough idle may be the cause of the jerking motion. You should turn your...

Getting a trouble code for knock sensor

Hi there. I would recommend having a technician come out and replace the knock sensor on the car. The knock sensor is on the engine block and detects if there is a misfire in the engine or a spark knock....

Check Engine Light is on with trouble code P0014.

Hello, this over-advanced camshaft timing is a significant problem, and should be checked out ASAP by a professional mechanic. Trouble code P0014 indicates a problem probably due to worn timing chain guides, a stretched timing chain, or a weak timing...

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