AutoCodes – Scion – P0798 Scion

P0798 Scion Code - Pressure Control Solenoid 'C' 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 'C' valve (Shift Solenoid Valve SL3). 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: P0798 Scion indicates Pressure Control Solenoid 'C' Electrical.
Common causes: Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Pressure Control Solenoid 'C' valve (Shift Solenoid Valve SL3).
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.

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Code Popularity 3,214

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 12, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0798 Scion 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.
The ECM commands gear shifts by turning the shift solenoid valves on and off. According to the input shaft speed, intermediate (counter) shaft speed, and output shaft speed, the ECM detects the actual gear (1st, 2nd, 3rd, 4th, 5th or 6th gear). When the gear commanded by the ECM and the actual gear are not the same, the ECM illuminates the MIL and stores the Diagnostic Trouble Code (DTC).

OBDII Code P0798 Scion - Pressure Control Solenoid 'C' Electrical - AutoCodes.com — P0798 Scion Code - Pressure Control Solenoid 'C' Electrical

What does this mean?

What are the Possible Causes of the DTC P0798 Scion?

Low transmission fluid level
Dirty transmission fluid
Faulty Pressure Control Solenoid 'C' valve (Shift Solenoid Valve SL3)
Pressure Control Solenoid 'C' valve harness is open or shorted
Pressure Control Solenoid 'C' valve circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0798 Scion?

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 P0798 Scion 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.

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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 P0798 Scion Code

What does OBDII code P0798 mean for a Scion?

Code P0798 indicates an electrical issue with pressure control solenoid 'C' within the transmission system.

What are the common symptoms of code P0798 in a Scion?

Symptoms may include erratic shifting, transmission slipping, poor fuel economy, and illuminated check engine light.

What causes code P0798 on a Scion?

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

Can driving with code P0798 damage my Scion's transmission?

Yes, prolonged driving with this issue can lead to further transmission damage and reduced vehicle performance.

How do I diagnose code P0798 in a Scion?

Diagnosis typically involves checking the solenoid, inspecting wiring and connectors, testing the TCM, and verifying transmission fluid levels and quality.

How do I fix code P0798 on a Scion?

Repairs may involve replacing the pressure control solenoid, repairing or replacing damaged wiring, flushing and refilling transmission fluid, or addressing issues with the TCM.

How much does it cost to repair code P0798 on a Scion?

Repair costs vary but typically range from $200 to $600 depending on whether the solenoid, wiring, or other components need replacement.

Can low transmission fluid cause code P0798 on a Scion?

Yes, insufficient or degraded transmission fluid can affect solenoid function and trigger this code.

Is code P0798 specific to Scion vehicles?

No, P0798 is a generic OBDII code applicable to many vehicles, but the specifics may vary by make and model.

Do I need a professional mechanic to fix code P0798?

While some issues like fluid checks can be handled by DIYers, diagnosing and repairing electrical or solenoid problems may require professional expertise.