What is OBD-II Code P27A3 – Electric/Auxiliary Transmission Fluid Pump B Performance/Stuck Off
As a mechanic, one of the most common issues I come across is faulty transmission. One of the codes you may encounter when your car’s transmission is having issues is the OBD-II code P27A3 – Electric/Auxiliary Transmission Fluid Pump B Performance/Stuck Off. This code is related to the transmission fluid pump and indicates that it is either not working properly or completely stuck off. This code is commonly associated with automatic transmission vehicles.
In this article, I will provide a comprehensive explanation of the OBD-II code P27A3, what causes it, and how to repair the issue.
Understanding OBD-II Code P27A3 – Electric/Auxiliary Transmission Fluid Pump B Performance/Stuck Off
The transmission fluid pump is an essential component of the automatic transmission system. It ensures the transmission system runs smoothly by circulating fluid through the transmission to lubricate hydraulic parts and to transfer power from the engine to the wheels. If the transmission fluid pump fails, the transmission cannot function properly, and you may notice issues such as delayed gear shifting or complete transmission failure.
Code P27A3 indicates a problem with the auxiliary transmission fluid pump. This pump is responsible for maintaining the transmission system’s hydraulic pressure, which allows the clutches and gears to shift smoothly. The code indicates that the transmission fluid pump is either not functioning correctly or is entirely stuck off, which can lead to significant transmission problems.
Causes of OBD-II Code P27A3 – Electric/Auxiliary Transmission Fluid Pump B Performance/Stuck Off
Several factors can cause OBD-II code P27A3, which include:
1. Electrical issues: The transmission fluid pump relies heavily on electricity and wiring systems to function correctly. Electrical issues, such as damaged wires, corroded connectors, or defective solenoids, can lead to the transmission fluid pump malfunctioning.
2. Lack of maintenance: Failure to perform regular maintenance, such as changing the transmission fluid, can clog the transmission fluid pump’s filter, causing it to work harder to maintain hydraulic pressure.
3. Mechanical Issues: Damaged or worn-out internal components of the transmission system can cause the transmission fluid pump to work harder than usual, leading to its premature failure.
4. Overheated transmission: Running the transmission at high temperatures for long periods can cause the transmission fluid to deteriorate, causing the transmission fluid pump to fail sooner.
How to diagnose OBD-II Code P27A3 – Electric/Auxiliary Transmission Fluid Pump B Performance/Stuck Off
Diagnosing the cause of OBD-II code P27A3 typically involves scanning the car’s onboard diagnostic system with a code reader. The code reader displays the code, which helps identify the problem. After retrieving the code, the mechanic will need to take a few steps to diagnose the cause of the fault. These includes:
1. Check the electricity supply to the transmission fluid pump: To diagnose electrical issues with the transmission fluid pump, the mechanic will need to check the electrical supply to the pump. This may involve checking the connector, wires, and solenoid, and identifying any damaged parts or connections.
2. Check the transmission fluid pump filter: To diagnose and resolve issues related to a clogged transmission fluid pump filter, the mechanic will need to check the transmission fluid level and quality, inspect the filter for damage and debris, and replace if needed.
3. Inspect the transmission system: The mechanic may need to do a visual inspection of the transmission system, checking for damage or worn-out parts. This may involve taking the transmission apart or inspecting it while the car is lifted.
Repairing OBD-II Code P27A3 – Electric/Auxiliary Transmission Fluid Pump B Performance/Stuck Off
Once the mechanic has identified the cause of the fault, they can take the necessary steps to repair the issue. Repairs to fix code P27A3 depend on the cause of the problem. Here are some possible repairs:
1. Electrical repairs: Electrical repairs may include replacing damaged wires or connections or replacing the solenoid.
2. Transmission Fluid Pump Repairs: Repairs to the transmission fluid pump may involve replacing the pump entirely, or just replacing the faulty part, depending on the severity of the damage.
3. Maintenance Repairs: Regular maintenance, ranging from oil changes to transmission flushes, can help prevent transmission fluid pump malfunctions caused by lack of maintenance.
Frequently Asked Questions
1. Can I drive my car with OBD-II code P27A3?
It’s not recommended to drive your car with a fault in the transmission system, especially if you notice issues such as delayed shifting, a burning smell, or difficulty accelerating. Always have your car checked as soon as possible.
2. Can I reset the OBD-II code P27A3 myself?
Yes, but resetting the code without repairing the underlying issue will only cause the code to reappear. It’s better to identify the problem and fix it.
3. How much does it cost to repair code P27A3?
The cost to repair code P27A3 varies depending on the cause of the problem and the parts required. The repair cost could range from a few hundred dollars to several thousand dollars.
4. Can a transmission flush fix code P27A3?
A transmission flush can help resolve issues caused by a lack of maintenance, such as a clogged transmission pump filter. However, if the transmission pump has already failed, a transmission flush may not resolve the problem.
5. Is it safe to drive with P27A3 code?
If your vehicle is experiencing issues related to the transmission fluid pump and showing code P27A3, it’s best to avoid driving until the problem is resolved. Driving with a faulty transmission can put you and other road users at risk.
Conclusion
Code P27A3, Electric/Auxiliary Transmission Fluid Pump B Performance/Stuck Off, is a common code that indicates a problem with the transmission fluid pump. It’s essential to pay attention to any issues related to the transmission system, as this could indicate a bigger problem. If you notice any issues with your car’s transmission or receive code P27A3, consult a professional mechanic to identify and fix the problem. Taking care of your car’s transmission system by performing regular maintenance can help prevent transmission pump malfunctions.
Case study:
One of my clients brought in their Honda Accord after noticing delayed gear changes, accompanied by a ticking sound coming from the transmission system. After scanning the onboard diagnostic system, we discovered code P27A3. Upon inspection, we found the transmission filter’s clogged filter was not allowing transmission fluid to pass through the transmission pump, causing it to work harder than usual and burn out eventually. After replacing the filter and topping up the transmission fluid, we cleared the fault code and tested the vehicle. The client reported a significant improvement in gear change and a significant reduction in noise from the transmission system.
References
1.https://www.autocodes.com/p27a3.html
2.https://www.yourmechanic.com/article/p27a3-obd-ii-trouble-code-electric-auxiliary-transmission-fluid-pump-b-performance-stuck-off-by-jason-unrau
3.https://www.obd-codes.com/p27a3
4.https://www.autocodes.com/uploads/complete-obd2-powertrain-codes.pdf