P2789

Clutch A Adaptive Learning at Limit

Q: Is it safe to drive with P2789?

You can drive short distances, but degraded shifting and slipping can accelerate wear. Have the transmission checked soon.

Q: Can I just clear P2789?

Clearing resets the adaptives, but if the clutch is worn or fluid is bad the code returns as the controller hits its limit again.

Transmission controls Generic OBD-II Medium

What it means

P2789 means the transmission controller has used up its full adaptive range trying to keep clutch A engaging smoothly and can no longer compensate. It usually points to a worn clutch, low or degraded fluid, or a pressure-control problem. The car still moves, but shifts get harsh or slip, so it should be serviced before further wear sets in.

Medium

Can I keep driving? Short term yes, but shifts will feel off — the controller has run out of room to compensate for clutch wear, so have it serviced before it degrades further.

Real-world scan data

Seen in

257

scans in the past year

Found in

<0.1%

of scans

0.1%

of scans that found faults

Appears alongside · share of P2789 scans

P1984in 80.9% of scans

P1844in 36.6% of scans

P185Bin 36.6% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Harsh, delayed, or slipping shifts
Shudder or flare on engagement
Possible limp/reduced-gear mode

Common causes

Most likely first

Worn clutch friction material (adaptives maxed out compensating)Likely
Low or contaminated transmission fluidCommon
Faulty pressure control solenoid affecting clutch applyCommon
Internal hydraulic leak or valve-body wearLess often
Mechanical internal transmission wearLess often

How to diagnose & fix

Work through it in order

Check transmission fluid level and condition first — low or burnt fluid is the cheapest common cause.
Read freeze-frame and view the clutch adaptive values to see how far they've drifted.
Service the fluid/filter if it is dirty, then reset adaptives and re-learn.
Test the pressure control solenoid and line pressure.
If shifts still degrade, inspect for internal clutch wear; a rebuild may be needed. Clear and re-test.

FAQ

Quick answers

Is it safe to drive with P2789?+

You can drive short distances, but degraded shifting and slipping can accelerate wear. Have the transmission checked soon.

Can I just clear P2789?+

Clearing resets the adaptives, but if the clutch is worn or fluid is bad the code returns as the controller hits its limit again.

Read & clear P2789 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX