P0843 OBD-II Trouble Code: Transmission Fluid Pressure Sensor A Circuit High

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

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0843 code

P0843 is a diagnostic trouble code (DTC) for "Transmission Fluid Pressure Sensor A Circuit High". 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 P0843 DIAGNOSTIC Get a fair and transparent estimate upfront

P0843 trouble code definition

A P0843 trouble code is related to a vehicle’s automatic transmission and its fluid pressure sensor.

What the P0843 code means

P0843 is an OBD-II generic code for a voltage problem with the transmission fluid pressure sensor in that the signal being sent to the engine control unit is higher than the manufacturer’s parameters for the desired amount of fluid pressure for that given driving condition. This means that the fluid pressure needed to change gears, coast, hold a stopped position, etc. is not what is being read by the sensor.

What causes the P0843 code?

While there could be a number of causes for a P0843, the most common are:

  • Faulty transmission fluid pressure control solenoid
  • Faulty transmission fluid pressure sensor
  • Dirty or contaminated transmission fluid
  • Internal/external transmission line blockages

What are the symptoms of the P0843 code?

Symptoms can range from nothing other than a check engine light, to poor, harsh, and slipped shifting of the transmission. The associated symptoms of a P0843 will help you better determine the root of the problem.

How does a mechanic diagnose the P0843 code?

First, your mechanic will test drive the vehicle to see if there is a noticeable problem with the transmission fluid pressure. This will require getting the transmission fluid up to normal operating temperature too. If there are no adverse conditions, your mechanic will move on to test the pressure sensor with a digital multimeter. The pressure control solenoid will be tested next as well as all associated wiring before determining an internal transmission problem is the culprit.

Common mistakes when diagnosing the P0843 code

Hastily replaced parts may only hide the real problem which could be dirty transmission fluid or internal damage.

How serious is the P0843 code?

The seriousness of a P0843 depends on how the vehicle drives with the code. If operations are as normal, the code could just be a faulty sensor. If not, driving may become difficult.

What repairs can fix the P0843 code?

Additional comments for consideration regarding the P0843 code

When repair a P0843, it’s wise to have the transmission fluid changed and flushed as well. This will help the vehicle’s performance and efficiency.

Need help with a P0843 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
P0843
Check Engine Light

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0843 code.

SCHEDULE P0843 DIAGNOSTIC
Get a $20 credit for the follow-up repair

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

5,010

Rating Summary
4,615
191
48
28
128
4,615
191
48
28
128

Kenneth

19 years of experience
509 reviews
Kenneth
19 years of experience
Toyota Sequoia - Check Engine Light is on - Newport Beach, California
Kenneth did a great job and very knowledgeable. He has a great attitude and I will for sure be using him again.

Richard

11 years of experience
45 reviews
Richard
11 years of experience
Honda Civic - Check Engine Light is on - Tucson, Arizona
Had damage to wires leading to a coil and was unable to drive the car to a service center so I took a chance on having somebody come out to work on the car. It couldn't of worked out any better. Would definitely recommend Richard to anybody needing car service.

Clifton

29 years of experience
207 reviews
Clifton
29 years of experience
Dodge Ram 1500 - Check Engine Light is on - Lake Worth, Florida
Clifton was on time and very professional. I will definitely recommend him to my friends and family.

Walter

45 years of experience
85 reviews
Walter
45 years of experience
Nissan Sentra - Check Engine Light is on - Tulsa, Oklahoma
Very helpful and knowledgeable. Appreciate the friendliness on top of it, would definitely recommend.


Related questions

P0843

Trouble code P0843 pops up quite frequently on vehicles such as your Honda CR-V. The 2nd clutch transmission pressure switch is installed in the hydraulic pressure circuit to the 2nd clutch. The Powertrain Control Module (PCM) uses this information to...

More related articles

P0809 OBD-II Trouble Code: Clutch Position Sensor Circuit Intermittent Malfunction
P0809 code means there is an malfunction within the clutch position sensor circuit often due too a defective sensor or corroded wiring/connecters.
P2090 OBD-II Trouble Code: 'B' Camshaft Position Actuator Control Circuit Low Bank 1
P2090 P2090 Code Definition The P2090 code is a generic powertrain code related to fuel and air metering and auxiliary emission controls. This code appears when the engine control module (ECM) has detected variances between camshaft B and the crankshaft...
P0209 OBD-II Trouble Code: Injector Circuit Malfunction - Cylinder 9
P0209 P0209 code definition Injector Circuit Malfunction - Cylinder 9 What the P0209 code means The meaning of the P0209 code is that the fuel injector circuit was found to have out of range voltage or resistance. This out...

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