P2798 Code - Auxiliary Transmission Fluid Pump Control Circuit Low
Quick Answer
The P2798 diagnostic trouble code (DTC) refers to the Auxiliary Transmission Fluid Pump Control Circuit Low. Common causes include Faulty pump control module: The control module that regulates the auxiliary transmission fluid pump may be malfunctioning, causing a low voltage condition, Damaged wiring: Wiring that connects the control module to the pump may be frayed, damaged, or corroded, leading to a poor electrical connection, Malfunctioning pump: The auxiliary transmission fluid pump itself may be faulty, causing a decrease in fluid pressure. 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
- P2798 indicates Auxiliary Transmission Fluid Pump Control Circuit Low.
- Common causes
- Common causes include Faulty pump control module: The control module that regulates the auxiliary transmission fluid pump may be malfunctioning, causing a low voltage condition, Damaged wiring: Wiring that connects the control module to the pump may be frayed, damaged, or corroded, leading to a poor electrical connection, Malfunctioning pump: The auxiliary transmission fluid pump itself may be faulty, causing a decrease in fluid pressure.
- 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 P2798 Description
The P2798 diagnostic trouble code (DTC) refers to the Auxiliary Transmission Fluid Pump Control Circuit Low. This code is set when the control module detects a low voltage condition in the circuit that controls the auxiliary transmission fluid pump. The auxiliary transmission fluid pump is responsible for maintaining proper fluid pressure in the transmission system, which is crucial for smooth gear shifts and overall transmission performance.
Common Causes of P2798
- Faulty pump control module: The control module that regulates the auxiliary transmission fluid pump may be malfunctioning, causing a low voltage condition.
- Damaged wiring: Wiring that connects the control module to the pump may be frayed, damaged, or corroded, leading to a poor electrical connection.
- Malfunctioning pump: The auxiliary transmission fluid pump itself may be faulty, causing a decrease in fluid pressure.
- Low transmission fluid levels: Insufficient transmission fluid levels can also lead to a low voltage condition in the pump control circuit.
- Electrical issues: Other electrical faults, such as a blown fuse or relay, can also trigger this code.
Symptoms of P2798
- Harsh shifting: The transmission may shift abruptly or with excessive force, leading to a jerky driving experience.
- Delayed engagement: The transmission may take longer to engage when shifting from park to drive or reverse.
- Transmission slipping: The transmission may slip out of gear or struggle to maintain the appropriate gear ratio, affecting overall vehicle performance.
- Transmission overheating: The transmission may overheat due to inadequate fluid pressure, leading to potential damage to internal components.
How to Fix P2798
- Diagnose the issue: Use a scan tool to retrieve the DTC and conduct a thorough inspection of the auxiliary transmission fluid pump control circuit.
- Check wiring and connections: Inspect the wiring harness for any damage or corrosion, and ensure all connections are secure.
- Test the pump control module: Test the pump control module for proper functionality, and replace if necessary.
- Replace the auxiliary transmission fluid pump: If the pump itself is faulty, it may need to be replaced to restore proper fluid pressure.
- Clear the DTC: After completing the repairs, clear the DTC and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P2798
The cost of repairing the P2798 code can vary depending on the specific cause of the issue and the labor rates in your area. In general, you can expect to pay anywhere from $200 to $500 for parts and labor to address this problem. Keep in mind that additional costs may apply if other components need to be replaced or if further diagnosis is required. It's recommended to consult with a professional mechanic to get a more accurate estimate based on your vehicle's make and model. Additionally, labor rates can fluctuate based on location, with rates typically ranging from $80 to $150 per hour.
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Code P2798 Information for Specific Makes
- P2798 Lexus — Auxiliary Transmission Fluid Pump Control Circuit Low
- P2798 Toyota — Auxiliary Transmission Fluid Pump Control Circuit Low
Frequently Asked Questions about P2798 Code
1. What are the common symptoms of OBDII code P2798?
- Common symptoms include poor transmission performance, difficulty shifting gears, and the illumination of the Check Engine light.
2. What could cause the Auxiliary Transmission Fluid Pump Control Circuit Low code (P2798) to trigger?
- The code can be triggered by issues such as a faulty transmission fluid pump, damaged wiring or connectors in the control circuit, or a low transmission fluid level.
3. How can I diagnose the cause of OBDII code P2798?
- Diagnosis typically involves using a scan tool to read the code, checking the transmission fluid level and condition, inspecting the wiring and connectors related to the auxiliary transmission fluid pump, and testing the pump itself for proper operation.
4. Can a low transmission fluid level cause OBDII code P2798 to appear?
- Yes, a low transmission fluid level can cause insufficient pressure in the system, triggering the P2798 code related to the auxiliary transmission fluid pump control circuit.
5. What are the repair options for OBDII code P2798?
- Repair options may include topping up the transmission fluid, repairing or replacing damaged wiring or connectors, and replacing the auxiliary transmission fluid pump if it is found to be faulty.
6. Is it safe to continue driving with OBDII code P2798 present?
- It is not recommended to continue driving with this code present, as it can lead to further transmission issues and potentially cause more damage over time.
7. Can I reset the Check Engine light after addressing OBDII code P2798 myself?
- Yes, once the underlying issue causing the code has been resolved, the Check Engine light can be reset using an OBDII scan tool to clear the code.
8. How much does it typically cost to repair OBDII code P2798?
- The cost of repairing OBDII code P2798 can vary depending on the specific cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.
9. Are there any preventive measures to avoid OBDII code P2798 in the future?
- Regularly checking and maintaining the transmission fluid level, conducting routine inspections of the transmission system, and addressing any issues promptly can help prevent the occurrence of code P2798.
10. How long does it take to repair OBDII code P2798?
- The repair time for OBDII code P2798 can vary depending on the cause of the issue and the extent of repairs needed, but it typically takes a few hours to a full day for diagnosis and repair.
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