Engine-CodesScion – P0798 Scion

P0798 Scion Code - Pressure Control Solenoid 'C' Electrical

Quick Answer

The P0798 diagnostic trouble code for Scion vehicles indicates an issue with the Pressure Control Solenoid 'C' in the transmission system. Common causes include Faulty pressure control solenoid 'C', Wiring issues or electrical connections related to the solenoid, Low transmission fluid levels or dirty transmission fluid. 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 Faulty pressure control solenoid 'C', Wiring issues or electrical connections related to the solenoid, Low transmission fluid levels or dirty transmission fluid.
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.
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code P0798 Scion Description

The P0798 diagnostic trouble code for Scion vehicles indicates an issue with the Pressure Control Solenoid 'C' in the transmission system. The pressure control solenoid is responsible for regulating the hydraulic pressure within the transmission. When this solenoid malfunctions or fails to operate properly, it can lead to erratic shifting patterns, transmission slippage, and other performance issues.

OBDII Code P0798 Scion - Pressure Control Solenoid 'C' Electrical
P0798 Scion Code - Pressure Control Solenoid 'C' Electrical

Common Causes of P0798 Scion

  1. Faulty pressure control solenoid 'C'
  2. Wiring issues or electrical connections related to the solenoid
  3. Low transmission fluid levels or dirty transmission fluid
  4. Mechanical issues within the transmission system
  5. Faulty transmission control module (TCM)

Symptoms of P0798 Scion

  1. Erratic shifting patterns
  2. Transmission slipping
  3. Harsh or delayed shifting
  4. Poor acceleration
  5. Decreased fuel efficiency

How to Fix P0798 Scion

  1. Diagnose the issue by using a scan tool to read the code and determine the exact cause of the problem.
  2. Inspect the wiring and electrical connections related to the pressure control solenoid for any damage or corrosion.
  3. Check the transmission fluid level and condition, topping up or replacing it if necessary.
  4. Replace the Pressure Control Solenoid 'C' if it is found to be faulty.
  5. Clear the diagnostic trouble code and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0798 Scion

The cost of repairing a Pressure Control Solenoid 'C' electrical issue in a Scion vehicle can vary depending on several factors such as the extent of the problem, the cost of parts, and labor rates. Typically, the cost of replacing a pressure control solenoid can range from $150 to $400, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary, with hourly rates typically ranging between $80 and $150. It's recommended to obtain quotes from local auto repair shops to get a more accurate estimate for the repair.

Tech Notes for P0798 Scion

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.

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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.

Discuss the causes and fixes for P0798 Scion OBDII Code

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