Skip the auto shop - Our mechanics make house calls

P0787 OBD-II Trouble Code: Shift/Timing Solenoid Low

check engine light

P0787 trouble code definition

A P0787 trouble code is related to a vehicle’s automatic transmission and its shift solenoids that control the transfer of hydraulic fluid to change gears.

What the P0787 code means

P0787 is an OBD-II generic powertrain code for voltage problem with the shift/timing solenoid in that the reading being sent to the engine control unit (ECU) is too low according to the manufacturer’s parameters. When this happens, the ECU can think the transmission is in a different gear than what the transmission actual is in.

What causes the P0787 code?

A P0787 code can have a variety of causes, but the most common are:

What are the symptoms of the P0787 code?

A P0787 can affect vehicles differently, but some drivers notice zero difference in performance at all. For others, the transmission will not shift out of gear or will experience harsh shifting or gear slipping. Some transmissions will also limit performance period, entering a transmission control module parameter known as “limp-mode.”

How does a mechanic diagnose the P0787 code?

Because shift solenoids actuate fluid transfer that actuates gear shifting, a P0787 can frequently be caused by low or dirty transmission fluid. Your mechanic will first check fluid levels to determine if the code is a result of low fluid. After that, a visual inspection of the external components and connectors will be next before diving into the shift solenoids. A professional OBD-II scanner can trigger shift solenoids to activate, with your mechanic paying close attention to each one. If one fails to activate, it will need to be replaced and new, clean fluid will need to be added.

Common mistakes when diagnosing the P0787 code

There can be instances where the circuit for the shift solenoids is bad instead of the solenoids themselves. This means wiring will need to be repaired and the transmission may need to be removed from the vehicle to do this.

How serious is the P0787 code?

The seriousness of a P0787 depends on how it affects the vehicle. If there is no noticeable side effects, it could just be intermittent and the code needs to be cleared and fluid needs to be added. If it’s causing shifting issues, the problem is more serious and will need immediate attention.

What repairs can fix the P0787 code?

The most common repairs for a P0787 are as follows:

Additional comments for consideration regarding the P0787 code

It’s important to pay close attention to how the vehicle shifts with a P0787 as it will typically indicate what will need to be replaced. Low fluid will typically cause noticeable differences.

Need help with a P0787 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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

Post a question and get free advice from our certified mechanics.

ASK A QUESTION

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...


Related questions

Q: intake control solenoid voltage

If the issue persists then it may be possible that the issue is with wiring or computer. Damaged wiring or a faulty computer may compromise power to the solenoid and affect its performance. Many automotive electronic circuits use 12 volts...

Q: signs

The anti-lock brake system uses sensors in the wheels and other inputs to help control the wheels from sliding, locking up, and to help control the car under certain driving conditions. Issues with the system could include these sensors, any...

Q: My car just shut off while driving nd wont start bsk up dosent even crank over nothing at all turns on

Without additional detail, this would be tough to diagnose, however the fact that it just shut down out of nowhere as you've described suggests that some kind of sensor or relay may have triggered this. I would suggest having an...