P07A4
Transmission Friction Element B Performance/Stuck Off
Transmission
Generic OBD-II
Medium
What it means
P07A4 means friction element B — a clutch or band inside the transmission — is not applying when commanded, so the transmission can slip, miss a gear, or shift erratically. Because the element isn't holding, extra heat builds up. Common causes are low or dirty fluid, a faulty apply solenoid, or wear in the friction element itself.
Medium
Can I keep driving? Drivable but compromised — a friction element not applying causes slipping or a missing gear and added heat, so repair promptly.
Common symptoms
What you'll notice
- Delayed, erratic, or missed gear engagement
- Transmission slipping or jerking under load
- Transmission overheating
- Reduced fuel economy
- Check-engine light on
Common causes
Most likely first
- Low transmission fluid levelLikely
- Worn or damaged friction element B (clutch or band)Common
- Faulty apply solenoid not commanding the element onCommon
- Wiring or connector fault, or a bad pressure sensor, in the apply circuitLess often
- Internal mechanical failure of the transmissionLess often
How to diagnose & fix
Work through it in order
- Check transmission fluid level and condition; correct if low, dirty, or burnt.
- Read freeze-frame data to identify the gear and conditions when the element fails to apply.
- Inspect and test the apply solenoids for element B and their wiring; clean or replace faulty solenoids.
- Perform a fluid and filter service to clear debris that can block the apply circuit.
- If electrical and hydraulic checks pass, inspect the friction element and valve body; rebuild or replace as needed.
FAQ
Quick answers
Is it safe to drive with P07A4?+
Only for short trips. An element that won't apply causes slipping and heat, which can damage the transmission further, so repair it promptly.
Can I just clear P07A4?+
You can, but if the element isn't applying due to a solenoid, fluid, or mechanical fault, the code and the symptoms return.
Related codes
Often seen with P07A4
Read & clear P07A4 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX