The code P07A5: Transmission Friction Element B Stuck On indicates a malfunction within the transmission, specifically pointing to the “Friction Element B” being stuck in the ‘on’ position. This issue is often caused by problems with the transmission fluid or internal mechanical components. It is a signal that your vehicle’s transmission requires immediate attention to prevent further damage or erratic driving behavior.
P07A5 quick overview
| Meaning | P07A5: Transmission Friction Element B Stuck On |
| Is it serious? | Yes, it can lead to erratic driving conditions and potential further damage if not addressed. |
| Possible causes | – Low Automatic Transmission Fluid (ATF) – Worn or damaged internal friction elements – Dirty or contaminated ATF – Wiring issues such as shorts, opens, or heat damage – Uneven tire sizes or pressures causing rotational speed discrepancies – Faulty Transmission Control Module (TCM) or Engine Control Module (ECM) – Water damage to transmission modules or wiring harness |
| How to diagnose? | Check ATF Quality: Ensure the fluid is clean and at the proper level. Inspect Transmission Wiring: Look for damaged wires or poor connections. Service ATF: Replace the transmission fluid, filter, and gasket if necessary. Examine Tires: Verify that all tires are evenly worn and properly inflated. Test TCM and ECM: Check for any issues with the control modules. Verify ATF Type: Ensure the correct type of ATF is used for the specific vehicle. |
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In simpler terms, the P07A5 code means that a part inside your car’s transmission that helps change gears is stuck and not working properly. This can cause your car to drive strangely or even damage the transmission if not fixed soon. It’s usually because of issues with the transmission fluid or other internal parts.
How to fix P07A5 – learn from mechanics
I looked into P07A5 service cases at iatn.com website where in the private forums the mechanics seek advice from other mechanics. I looked up a bunch of cases to help you decide how to fix your issue and see what would a real mechanic do to solve it.
Case #1: Ford
Vehicle Information: 2018 Ford Fusion, 2.0L EcoBoost
Issue + Repair History: MIL on, code P07A5, erratic shifting. Previous ATF change done 10,000 miles ago.
What are people suggesting to fix issue:
- Check ATF level and quality
- Inspect transmission wiring and connectors
- Look for uneven tire wear and correct tire pressure
- Consider potential TCM or ECM issues
Final Fix: Replaced worn internal friction element and performed ATF service.
Case #2: Toyota
2015 Toyota Camry, 2.5L
Issue + Repair History: MIL illuminated, code P07A5, harsh shifts, no previous transmission repairs.
Other OBD2 Codes + Test Results: Code P0420 also present
What are people suggesting to fix issue:
- Perform full ATF service
- Check for uneven tire sizes and wear
- Inspect electrical connections at transmission
- Diagnose potential catalytic converter issue due to P0420
Final Fix: ATF service completed and found and repaired damaged transmission harness connector.
Case #3: Chevrolet
Vehicle Information: 2012 Chevrolet Malibu, 2.4L
Issue + Repair History: MIL on, code P07A5, transmission slipping. Replaced ATF and filter 5,000 miles ago.
What are people suggesting to fix issue:
- Verify correct ATF used during last service
- Check for any ATF leaks
- Inspect and test transmission solenoids
- Examine TCM for any signs of damage or water intrusion
Final Fix: Incorrect ATF type was used in previous service. Flushed and replaced with correct ATF, issue resolved.
How to diagnose P07A5
I made you an overview of solving this DTC, based on all the advice that was suggested by certified mechanics to address this issue in previously mentioned service cases.
| Advice | Diagnostic Step Description |
|---|---|
| Check ATF Level and Quality | Verify the automatic transmission fluid is at the correct level and not contaminated. |
| Inspect Transmission Wiring and Connectors | Look for any damaged wires, loose connections, or corrosion at the transmission connectors. |
| Perform Full ATF Service | Replace the transmission fluid and filter to ensure clean and adequate fluid is circulating. |
| Check for Uneven Tire Wear | Ensure tires are evenly worn and properly inflated as uneven tires can cause transmission issues. |
| Examine TCM and ECM for Issues | Inspect the Transmission Control Module and Engine Control Module for any signs of damage or water intrusion. |
| Verify Correct ATF Used | Ensure that the type of ATF used is the correct specification for the vehicle. |
Car Diagnostics Training
- Car Electrical basics
- OBD-II scanner basics
- How to use an OBD reader
- Introduction to a Bi-directional Scan tool
- OBD scanner buyer’s guide + discounts
I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko