What is OBD-II Code P2798 – Electric/Auxiliary Transmission Fluid Pump A Control Circuit Low
If you ever encounter an illuminated check engine light on your car’s dashboard, it suggests that there is a problem with your car’s systems. A mechanic can diagnose the issue by connecting an OBD-II scanner to the vehicle’s onboard diagnostic system. The scanner provides an error code that corresponds to the source of the issue. One possible error code is P2798, which indicates that the electric/auxiliary transmission fluid pump A control circuit has a low voltage or low implementation signal.
In this article, we will explain in detail what the P2798 OBD-II error code means and discuss the probable causes, symptoms, and how to troubleshoot and fix this error code for a long-term and cost-effective solution.
Probable Causes of P2798 OBD-II Error Code
When your car’s OBD-II system detects the P2798 error code, it likely points to an issue with the electric/auxiliary transmission fluid pump A control circuit. The possible reasons for this error code can include:
1. Faulty Wiring Connections and Connections
Faulty wiring, corrosion or loose connection at the electric/auxiliary transmission fluid pump A control circuit could cause the P2798 error code to display. Wiring damage can occur when a component rubs and connects to another part continuously or because of low voltage in some area of the electric/auxiliary transmission fluid pump A control circuit, leading to a fault.
2. Failed Electric/Auxiliary Transmission Fluid Pump A
A damaged or failed electric/auxiliary transmission fluid pump A can produce the P2798 OBD-II error code. The pump is responsible for regulating the transmission’s hydraulic pressure, ensuring smooth gear shifts and transfer of power from the engine to the transmission. If the pump fails, the fluid level will drop and cause reduced hydraulic pressure, resulting in various other transmission-related symptoms.
3. Low Transmission Fluid Level
If the car’s transmission fluid level drops, it will cause issues related to the transmission’s smooth operation and generate the P2798 OBD-II error code. Transmission fluid is critical as it lubricates and cools the gearbox parts, allowing for smooth shifts and transferring power to the wheels without jerking. Suppose the fluid level drops too low. In that case, the transmission pump will draw in air into the system and produce a whining sound and other transmission-related problems.
Symptoms of P2798 OBD-II Error Code
Here are some indications that your car is suffering from the P2798 OBD-II error code:
1. Illuminated Check Engine Light
One of the most critical indications of the P2798 OBD-II error code is the illuminated check engine light on the car’s dashboard. Whenever the error code is detected, it will trigger the check engine light alerting the driver of the issue.
2. Reduced Transmission Performance
Another symptom of the P2798 OBD-II error code is a reduction in transmission performance. The transmission may fail to shift gears smoothly—slippage, delayed shifting, or jerking and stuttering as the gears change.
3. Whining Sound from the Transmission
When the P2798 error code occurs due to low transmission fluid, a whining noise will be apparent emanating from the transmission. The sound is caused by the vacuum effect that occurs when the transmission pump tries to suck in fluid from a low level.
How to Troubleshoot and Fix P2798 OBD-II Error Code
These are the steps to follow to troubleshoot and fix the P2798 OBD-II error code:
1. Check the Electric/Auxiliary Transmission Fluid Pump A Control Circuit Wiring and Connections
Perform a thorough inspection of the electric/auxiliary transmission fluid pump A control circuit’s wiring and connections. Make sure that the wires, connectors, and terminal connections are not corroded or loose. Repair or replace any damaged components.
2. Inspect and Replace Electric/Auxiliary Transmission Fluid Pump
If the wiring and connections are in excellent condition, the next course of action is to check the electric/auxiliary transmission fluid pump A. Check the pump’s connections, wiring, and internal components for damage. If there are any signs of damage, replace the pump entirely.
3. Refill Transmission Fluid and Test Drive
If the wiring and the electronic component of the electric/auxiliary transmission fluid pump A control circuit are working correctly, inspect the fluid level in your car’s transmission. Suppose the fluid level is low, add to the required amount. Then drive the car and monitor the transmission’s performance and check whether the P2798 error code appears again.
Frequently Asked Questions
Q1. What Does P2798 OBD-II Error Code Mean?
P2798 is an OBD-II error code that suggests an issue with the electric/auxiliary transmission fluid pump A control circuit, often caused by faulty wiring, failed electric/auxiliary transmission fluid pump A, or low transmission fluid level.
Q2. How to Diagnose P2798 OBD-II Error Code?
To diagnose the P2798 OBD-II error code correctly, you will need to connect an OBD-II scanner to the car’s diagnostic port, retrieve the error code, and analyze the cause.
Q3. What Are the Symptoms of P2798 OBD-II Error Code?
The symptoms of the P2798 OBD-II error code include illuminated check engine light on the car’s dashboard, reduced transmission performance, and a whining sound from the transmission operations.
Q4. Can You Drive with P2798 OBD-II Error Code?
It’s not advisable to drive with P2798 OBD-II error code continually displayed on the car’s dashboard. The fault will reduce the transmission performance and potentially cause further damage to your vehicle’s transmission systems.
Q5. How Do You Fix P2798 OBD-II Error Code?
To fix the P2798 OBD-II error code, verify the electric/auxiliary transmission fluid pump A wiring, connections, and inspect/replace the pump if it’s not working correctly. Then refill the transmission fluid level to the required amount. Test drive the car and monitor the transmission’s performance for a long-term solution.
Conclusion
The P2798 OBD-II error code denotes an issue with the electric/auxiliary transmission fluid pump A control circuit, caused by failed wiring, pump, or low transmission fluid level. The error code can be resolved through proper inspection, replacement of faulty components, and the correct fluid level adjustment. To maintain the longevity of your vehicle and keep transmission systems working smoothly, have any faulty components and wiring checked immediately and resolve if necessary.