P0989 OBD-II Trouble Code: Transmission Fluid Pressure Sensor/Switch E Circuit Low

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

SCHEDULE P0989 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0989 code

P0989 is a diagnostic trouble code (DTC) for "Transmission Fluid Pressure Sensor/Switch E Circuit Low". 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 $79.99. 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$79.99$20.00
Toyota$79.99$20.00
BMW$79.99$20.00
SCHEDULE P0989 DIAGNOSTIC Get a fair and transparent estimate upfront

diagnostic check engine light

P0989 code definition

The P0989 trouble code notes a problem with the transmission fluid pressure sensor E circuit.

What the P0989 code means

The P0989 code is a generic OBD-II trouble code that detects a transmission fluid pressure sensor E circuit abnormality. In this case the “E” circuit is a region of the circuit, and not any one component. This sensor circuit is a key component of the transmission hydraulic pressure system. The powertrain control module (PCM) calculates the ideal hydraulic pressure based on performance and operations such as engine speed, vehicle speed, and throttle position, and the pressure control solenoids control this hydraulic pressure. If the PCM notes a discrepancy between the fluid pressure level and the desired level, then the P0989 code may be detected.

What causes the P0989 code?

Potential causes of the P0989 trouble code include:

  • Defective transmission fluid pressure sensor
  • Malfunctioning electronic pressure control solenoid
  • Defective electrical components, such as wires, connectors, and fuses
  • Insufficient transmission fluid levels
  • Dirty transmission fluid
  • Blockages within the hydraulic pressure system
  • Problems within the internal transmission
  • In rare cases, a faulty PCM or transmission control module

What are the symptoms of the P0989 code?

The P0989 trouble code will often be joined by the check engine soon Warning Light illuminating on the gauge cluster. It is common for there to be no other noticeable symptoms, but it’s also common for there to be serious transmission issues, such as slippage, harsh shifting, overheating, the activation of “limp-in” mode, and possibly a total inability to shift. The torque converter clutch may also be incapable of engaging or disengaging. The P0989 code is usually accompanied by a noticeable decrease in fuel efficiency.

How does a mechanic diagnose the P0989 code?

The P0989 code will be addressed using a standard OBD-II trouble code scanner. A certified mechanic will view the freeze frame data from the scanner to assess the P0989 code, and to also look for other trouble codes that are present. In the event that numerous codes are detected, they will be addressed in the order in which they appear. The mechanic will then need to reset the trouble codes, restart the vehicle, and check to see if the P0989 code is still detected. If it is not, then an intermittent error or an inaccurate detection are likely to blame.

If the code does remain detected, then the technician will begin by checking the transmission fluid. If the fluid is dirty, it will need to be flushed from the system and replaced. If the fluid level is low, it should be replenished, and leaks should be checked for. If the fluid is highly contaminated, however, then there likely are severe problems with the transmission, and a total rebuild or replacement may be necessary.

All electrical components should then be visually inspected. Short wires, open connectors, and blown fuses will need to be replaced. Next, the mechanic can use a manual pressure gauge to check the actual hydraulic pressure relative to ideal level, as determined by the manufacturer. If the fuel pressure is low, then there is likely a malfunctioning pressure control solenoid, or a hydraulic blockage. There may also be a faulty high pressure pump or electronic pressure regulator. If the issue is still unresolved, then the ground and voltage signals from the fluid pressure sensor will need to be checked.

Following any replacements, the mechanic should pause the inspection, reset the trouble codes, restart the vehicle, and again check to see if the code remains detected. This helps identify the moment that the issue is resolved.

Common mistakes when diagnosing the P0989 code

The most frequently made mistake when diagnosing the P0989 code comes from failing to properly adhere to the OBD-II trouble code diagnosis protocol. It is very important that mechanics abide by the protocol at all times, as this helps avoid erroneous repairs, and ensure an efficient inspection.

High pressure pumps are commonly replaced when they are in working order, because mechanics have overlooked the actual error.

How serious is the P0989 code?

In most cases, a vehicle with the P0989 trouble code will still be drivable, though there may be noticeable transmission problems. Regardless of the drivability, continuing to drive a vehicle with this code can cause irreparable damage to the transmission, so an inspection should be scheduled as soon as the code is detected.

What repairs can fix the P0989 code?

Possible repairs for the P0989 trouble code are:

Additional comments for consideration regarding the P0989 code

It is very common for the P0989 code to be accompanied by other codes, such as transmission slippage, shift solenoid, and torque converter clutch codes.

Need help with a P0989 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
P0989
OBD-II

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

SCHEDULE P0989 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

4,255

Rating Summary
3,898
174
45
26
112
3,898
174
45
26
112
Ben

Ben

39 years of experience
1020 reviews
Ben
39 years of experience
Lexus LS430 - Check Engine Light is on - Houston, Texas
I was very pleased with the courtesy and work of Mr. Smith. He was exceptional in explaining and correcting the problem and thereby gained my trustI . I request he be my mechanic in all future service requests. I had a great experience working with Mr. Ben Smith.
Richard

Richard

19 years of experience
203 reviews
Richard
19 years of experience
Ram ProMaster 1500 - Check Engine Light is on - Bonita Springs, Florida
Prompt, polite and personal. Took the time to explain the process and his recommendations. 2 thumbs up
Michael

Michael

23 years of experience
37 reviews
Michael
23 years of experience
Ford F-150 - Check Engine Light is on - Federal Way, Washington
Very helpful and explained everything and what needs to be addressed. I feel informed and confident in Mike’s assessment and look forward to him performing services on my vehicle.
Rigoberto

Rigoberto

9 years of experience
650 reviews
Rigoberto
9 years of experience
Honda Civic - Check Engine Light is on - Chicago, Illinois
Rigoberto came on time & quickly diagnosed the problem- rats chewed thru wiring near the battery. He wasn’t able to fix it himself bc of parts, but gave me recommendations on where to go & how to not have the dealership sell me services that are not needed.

More related articles

How to Transfer a Car Title in Idaho
In order to prove ownership of a car, you must have the title. However, when a car is sold, given away or inherited, the title needs...
The Traveler’s Guide to Driving in Malaysia
CraigBurrows / Shutterstock.com Malaysia is a popular destination for many tourists today. The country has amazing sights and attractions that you will want to explore....
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...

Related questions

Q: 2010 Mini Cooper S - P0974 Trouble Code: Shift Solenoid A Control Circuit High

Hello - there are known issues with the valve body wearing out faster than should be normal on this transmission. I would check with a reputable transmission shop in your area for a rebuilt valve body. these are available with...

Q: What Is the OBD II System on My Car?

OBD II is an abbreviation of on board diagnostic system generation two. The system was brought into service in the vehicles of model year 1996. The system was put into all vehicles to monitor the operation and control the engine...

Q: The code read P0341, how do I know if it's the chain or the cam sensor?

There is a technical service bulletin for the Acura TSX stating that the code may be caused from the timing chain getting stretched until the tensioner cannot keep it tight any longer. This is a result of not getting oil...

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