OBD-II code · Powertrain (generic)
P07A3 Transmission Friction Element A Stuck On
Friction element A does not release when commanded — the apply piston cannot retract, leaving the clutch or band engaged. The transmission cannot complete shifts that need element A released, leading to harsh engagement or stall when stopping.
Is it safe to drive with P07A3?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyStuck apply piston (cannot retract)
- PossibleBroken or weak return spring
- Less likelyCarbon or debris buildup preventing free movement
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 4–14 h
- Emissions test
- Usually unaffected
- Parts involved
- Clutch Pack A, Apply Piston, Return Spring
Related codes
- P07A2Transmission Friction Element A Performance/Stuck Off
- P07A5Transmission Friction Element B Stuck On
- P07A7Transmission Friction Element C Stuck On
- P07A9Transmission Friction Element D Stuck On
- P07ABTransmission Friction Element E Stuck On
- P07ADTransmission Friction Element F Stuck On
- P07AFTransmission Friction Element G Stuck On
- P07B1Transmission Friction Element H Stuck On
- P07A0Transmission Friction Element G Slip Detected
- P07A1Transmission Friction Element H Slip Detected
- P07A4Transmission Friction Element B Performance/Stuck Off
- P07A6Transmission Friction Element C Performance/Stuck Off
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.