AutoCodes – Toyota – P0778 2014 Toyota RAV4

P0778 2014 Toyota RAV4 Code - Pressure Control Solenoid 'B' Electrical

Quick Answer

Changing from 1st to 6th is performed by the Engine Control Module (ECM) turning shift solenoid valves SL1, SL2, SL3, SL4, and SL on and off. Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Pressure Control Solenoid 'B' valve (Shift Solenoid Valve SL2). Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0778 2014 Toyota RAV4 indicates Pressure Control Solenoid 'B' Electrical.
Common causes: Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Pressure Control Solenoid 'B' valve (Shift Solenoid Valve SL2).
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 554

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 11, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P0778 2014 Toyota RAV4 Description

Changing from 1st to 6th is performed by the Engine Control Module (ECM) turning shift solenoid valves SL1, SL2, SL3, SL4, and SL on and off. If an open or short circuit occurs in any of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valves to allow the vehicle to be operated.
This Diagnostic Trouble Code (DTC) indicates an open or short in the shift solenoid valve SL2 circuit. The ECM commands gear shifts by turning the shift solenoid valves on or off. When there is an open or short circuit in any of the shift solenoid valve circuits, the ECM detects the problem and illuminates the MIL, and stores the DTC. The ECM also performs the fail-safe function and turns the other normal shift solenoid valves on or off. (In case of an open or short circuit, the ECM stops sending current to the circuit.)
While driving and shifting gears, if the ECM detects an open or short in the shift solenoid valve SL2 circuit, the ECM determines there is a malfunction.

OBDII Code P0778 2014 Toyota RAV4 - Pressure Control Solenoid 'B' Electrical - AutoCodes.com — P0778 2014 Toyota RAV4 Code - Pressure Control Solenoid 'B' Electrical

What does this mean?

What are the Possible Causes of the DTC P0778 2014 Toyota RAV4?

Low transmission fluid level
Dirty transmission fluid
Faulty Pressure Control Solenoid 'B' valve (Shift Solenoid Valve SL2)
Pressure Control Solenoid 'B' valve harness is open or shorted
Pressure Control Solenoid 'B' valve circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0778 2014 Toyota RAV4?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

When a transmission solenoid malfunction, in most cases the problem is not the electrical part of the solenoid; the problem is foreign material obstructing the mechanical function of the solenoid or the flow of the fluid through the transmission valve body. If the transmission fluid is dirty, it's recommended to change the transmission fluid and if possible, remove the transmission pan for further diagnosis. Excessive debris or metal particles on the transmission pan could be an indication that there is a mechanical transmission failure, and that the transmission will need to be rebuilt or replaced.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0778 2014 Toyota RAV4 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0778 2014 Toyota RAV4 code?

Need more information on how to fix the P0778 2014 Toyota RAV4 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0778 2014 Toyota RAV4 code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0778 2014 Toyota RAV4 Code

1. What does the OBDII code P0778 mean for a 2014 Toyota RAV4?

P0778 indicates an issue with the Pressure Control Solenoid 'B' in the transmission, specifically an electrical fault.

2. What are the common symptoms of code P0778 in a 2014 Toyota RAV4?

Symptoms may include harsh or delayed shifting, transmission slipping, a decrease in fuel efficiency, or the vehicle entering limp mode.

3. What causes the P0778 code to appear in a 2014 Toyota RAV4?

Common causes include a faulty pressure control solenoid 'B', damaged wiring or connectors, low transmission fluid, or a malfunctioning transmission control module (TCM).

4. Can low transmission fluid trigger the P0778 code?

Yes, low or contaminated transmission fluid can cause improper solenoid operation, leading to the P0778 code.

5. How do you diagnose the P0778 code on a 2014 Toyota RAV4?

Diagnosing involves using an OBDII scanner to confirm the code, inspecting the solenoid and wiring for damage, and checking transmission fluid levels and quality.

6. How serious is the P0778 code for a 2014 Toyota RAV4?

It is a moderately serious issue; ignoring it can lead to further transmission damage and reduced drivability.

7. How can the P0778 code be fixed on a 2014 Toyota RAV4?

Repairs may include replacing the pressure control solenoid 'B', repairing damaged wiring, flushing and refilling transmission fluid, or updating/replacing the TCM.

8. Can I drive my 2014 Toyota RAV4 with the P0778 code?

Driving with this code is not recommended as it may cause further transmission damage and compromise safety due to shifting issues.

9. How much does it cost to fix the P0778 code on a 2014 Toyota RAV4?

Repair costs can vary but may range from $200 to $500+ depending on whether the solenoid, wiring, or TCM needs repair or replacement.

10. Can a DIY mechanic fix the P0778 code on a 2014 Toyota RAV4?

If you have experience working on transmissions, you may be able to replace the solenoid or repair wiring, but professional diagnosis is recommended for accurate repairs.