P0788 OBD-II Trouble Code: Shift/Timing Solenoid High

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

SCHEDULE P0788 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0788 code

P0788 is a diagnostic trouble code (DTC) for "Shift/Timing Solenoid 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 for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 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$70.00$30.00
Toyota$70.00$30.00
BMW$70.00$30.00
SCHEDULE P0788 DIAGNOSTIC Get a fair and transparent estimate upfront

Check Engine Light

P0788 Code Definition

The P0788 code is a generic powertrain code related to the transmission. When this code is stored, it means that the engine control module (ECM) has found a problem with the shift/timing solenoid, specifically that the voltage to the timing valve is registering higher than allowed preset parameters.

Codes related to the P0788 include:

What the P0788 Code Means

When a code P0788 is stored, the ECM has detected a high voltage from the timing solenoid valve transmission control module (TCM) terminal, even though the TCM is commanding the timing solenoid valve to turn off. The ECM may be registering that the vehicle is in a different gear than it actually is.

Shift solenoids are used by an automatic transmission to manage the transfer of fluid between hydraulic circuits in order to make a change in the transmission gear ratio.

What Causes the P0788 Code?

Several problems may cause a P0788 code including:

  • Low or dirty transmission fluid
  • Damaged or defective shift solenoid
  • Open or shorted shifting solenoid valve harness
  • Poor electrical connection to the shifting solenoid valve circuit
  • Blockages in the transmission fluid passages
  • Damaged or defective transmission control module (TCM)
  • Internal mechanical failures in the transmission
  • Damaged or defective ECM (rare)

What are the Symptoms of the P0788 Code?

Symptoms of a P0788 code may include:

  • Warning or check engine light may illuminate
  • The vehicle may not exhibit any signs at all, other than a stored P0788 code
  • Transmission may not shift into, or from, a specific gear
  • Transmission may shift roughly from one gear to another
  • May experience transmission slippage
  • Transmission may overheat
  • Decrease in fuel efficiency
  • Vehicle may enter into “limp mode”

How Does a Mechanic Diagnose the P0788 Code?

A mechanic may use several methods to diagnose a P0788 trouble code, including:

Common Mistakes when Diagnosing the P0788 Code

It’s possible to diagnose a P0788 code as a faulty shift solenoid issue, when the problem is an issue related to the shift solenoid circuit. It is recommended to check and test all electrical wiring and circuitry carefully before proceeding with repairs.

How Serious is the P0788 Code?

Because a vehicle’s safe driving operation may be impacted due to faults that store a P0788 code, this code is considered a potentially serious code. When this code appears, it is recommended to immediately take your vehicle to your local service center or mechanic for repair and diagnosis.

What Repairs can Fix the P0788 Code?

Several repairs can fix a P0788 trouble code and include:

Additional Comments for Consideration Regarding the P0788 Code

Typically, additional shift solenoid codes will be stored along with the P0788 code. It is recommended to always diagnose and repair trouble codes in the order in which they appear.

Need Help with a P0788 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
Check Engine Light
P0788

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

SCHEDULE P0788 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

4.5/5

Number of Reviews

3,526

Rating Summary
3,215
155
41
23
92
3,215
155
41
23
92

Gary

32 years of experience
91 reviews
Gary
32 years of experience
This was my second time with Gary and could not have been happier with my experience with him. Would highly recommend him to any of my friends.
2004 TOYOTA TUNDRA - CHECK ENGINE LIGHT IS ON - MARIETTA, GEORGIA

Trung

9 years of experience
397 reviews
Trung
9 years of experience
A very nice guy! Quick, efficient and very honest. I now have an appointment scheduled this Saturday and only trust Trung to work on my car! Thanks again and I'll see you soon!
2012 NISSAN VERSA - CHECK ENGINE LIGHT IS ON - SAN JOSE, CALIFORNIA

Aaron

7 years of experience
71 reviews
Aaron
7 years of experience
Aaron was very friendly and professional! Came out to my apartment and completed the work in about half the estimated time, both times he came out to work on my car. Would definitely recommend him as your mechanic!
2010 DODGE AVENGER - CHECK ENGINE LIGHT IS ON - AUSTIN, TEXAS

Brett

22 years of experience
121 reviews
Brett
22 years of experience
Very professional and took the time to explain what was wrong with my vehicle.
2012 CHEVROLET MALIBU - CHECK ENGINE LIGHT IS ON - CHARLOTTE, NORTH CAROLINA

More related articles

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...
Veteran and Military Driver Laws and Benefits in New Mexico
The state of New Mexico offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch...
Auto Safety Tips
Driving is more than a way to get from point A to point B. Owning and driving a car can also be a highly enjoyable experience. Whether a person is driving...

Related questions

Q: Car will crank, doesnt stay running

Hello and thanks for your question. Ground wires will not have a voltage on them. Preform a resistance check on all of the pins to the harness plug. There should be resistance for the computer, high resistance for the power,...

Q: I got a p 507 code

That's a good question. P507 is your idle speed control. There are a few issues you may want to look into. The throttle valve may be sticking, bad throttle motor, ECM, or a wiring problem. I would start by checking...

Q: I need to know the diagnostic procedure for dtc p0717. Want to test wires before taking out transmission

If the sensor only has two wires, it is a reluctant AC sensor. If the sensor has three wires then it is a hall effect DC sensor. A two wire sensor will produce a sine wave signal: '()(-)()(-)(_)' or steady...

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