01 What Happens If You Ignore Wheel Bearing Noise? • 02 Avoid These Brake Pads If You Drive in Rainy or Coastal Reg… • 03 V10 vs V8 Engine: Which One is Better? • 04 P0172 – System Too Rich (Bank 1): Fuel Economy Problems • 05 Why Is Your Car's AC Blowing Warm Air? Find the Answer Here • 06 Understanding Gear Ratios: How Transmissions Impact Perform… • 07 Simple Steps You Can Follow When Your Car Refuses to Start • 08 Ford vs Toyota: Two Completely Different Definitions of Rel… • 09 P0016 - Crankshaft Position Camshaft Position Correlation B… • 10 Experts Say Most People Use Air Conditioning Wrong And It's… •

DTC codes / P07xx · Transmission / P07AA

P07AATransmission Friction Element E Performance/Stuck Off

P07AA indicates that the transmission control module has detected a performance problem with friction element E, meaning the clutch or brake that applies a specific gear ratio is slipping or not engaging when commanded. The computer compares expected input and output shaft speeds for the commanded gear and flags the code when the ratio falls outside the calibrated window, indicating the element is stuck off or failing to hold torque.

SystemPowertrain
Code typeGeneric (all makes)
SeverityHigh
Fix difficultyProfessional
AreaTransmission

Symptoms you may notice

  • Illuminated check engine light or transmission warning lamp, often with no other noticeable symptoms
  • Harsh or delayed shifts, especially when the affected gear is commanded
  • Transmission slipping or flaring during acceleration in the affected gear
  • Failure to engage a specific gear, causing the vehicle to stay in a lower gear or neutral
  • Elevated engine RPM at highway speed due to a missed upshift
  • Limp mode engagement with reduced power and fixed gear operation

Common causes, most likely first

  1. Low or degraded transmission fluid level causing insufficient hydraulic pressure to apply the element
  2. Sticking or faulty solenoid that controls hydraulic pressure to friction element E
  3. Worn or damaged friction plates or seals inside the transmission affecting element E
  4. Valve body wear or contamination blocking fluid passages to the element
  5. Internal transmission harness damage or poor electrical connection to the solenoid
  6. Transmission control module software calibration issue or faulty module
  7. Mechanical failure of the apply piston or return spring for the friction element

How to diagnose and fix it

  1. Check transmission fluid level and condition; top off or replace fluid if degraded
  2. Scan all modules for stored and pending codes, and record freeze-frame data to confirm the fault conditions
  3. Perform a road test with a scan tool monitoring commanded gear, input and output shaft speeds, and solenoid duty cycle
  4. Inspect the solenoid and internal wiring for the affected friction element for resistance and continuity
  5. Test hydraulic pressure at the appropriate port to verify the element is receiving adequate apply pressure
  6. Remove the transmission pan to inspect for debris, and test or replace the suspected solenoid or valve body
  7. If internal mechanical damage is confirmed, remove and overhaul or replace the transmission

What P07AA really tells you about element E

  • A P07AA code often sets without any drivability complaint because the transmission may compensate by adjusting shift pressure, so the warning light can be the only clue.
  • Technicians sometimes replace the solenoid for element E only to find the real problem is a worn valve body bore or a leaking apply piston seal, so hydraulic pressure testing is essential before parts replacement.
  • Low fluid level from a slow leak is a common cause that is easily overlooked, and the code may clear after topping off and clearing the adaptive learning.
  • The code does not always mean the friction element itself is mechanically failed; electrical faults in the solenoid circuit or a faulty transmission control module can produce the same ratio error.
  • Related codes such as P07A9 or P07AB may also be stored if the same element or its control circuit is intermittently faulty, so always review all transmission codes together.

Can I keep driving with P07AA?

Driving with P07AA is not recommended because the transmission may slip or fail to engage a gear, leading to loss of power or further internal damage. If you must move the vehicle, drive gently at low speed and avoid heavy acceleration or highway speeds until the fault is repaired.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

Running on fumes Free guides aren't free to make. Top up the tank. Any amount, one time. Fuel the Garage