P07A9Transmission Friction Element D Stuck On
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Each friction element (clutch or brake) has three functional codes: slip while commanded locked (P079A ff), performance/stuck off – it does not apply or applies too weakly – and stuck on – it does not release. GM's hybrid transmissions use only the stuck-on codes: when a clutch should release, the module expects slip to build and flags it if slip stays near zero – the Two-Mode SUVs (2008–13) in two cases: in mode 1 at very low slip with strong deceleration of slip and over 700 Nm for 3.2 s, in mode 2 at 80 rpm or less with over 180 Nm for 4.5 s, after two trips. The Cadillac CT6 plug-in compares with the release profile, 1 s, after one trip. Volt and Malibu do not use clutch 4.
- What you may notice
- Check engine light or 'service hybrid system' message
- Jolt or tie-up on mode or gear changes
- Engine stalls or drags when stopping
- Limp mode with reduced power
- Likely causes
- LikelyClutch D stuck, welded or piston hanging
- PossibleValve or spool sticking in the applied position
- PossibleContaminated fluid (debris)
- RareModule software
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €200 – €4,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.