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Home / DTC / P2789 — Adaptive learning embedding at the ito limit

P2789 — Adaptive learning embedding at the ito limit

Detailed page for trouble code P2789.

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Code

P2789

LAND ROVER P — Powertrain

Adaptive learning embedding at the ito limit

Brand: LAND ROVER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • TCM adaptive learning value hit stored limit
  • Corrupted or outdated TCM software/calibration
  • Intermittent or low battery/charging system voltage during adaptation
  • Faulty transmission speed sensors or wiring
  • Hydraulic problems (low/contaminated fluid, incorrect level)
  • Internal transmission wear (clutch packs, torque converter slipping)

Symptoms

  • Transmission shift schedule may be harsh, delayed, or erratic
  • Limp-home mode or restricted gear availability possible
  • Transmission slips or poor acceleration
  • MIL/amber transmission/engine light illuminated
  • Stored transmission-related trouble codes in addition to P2789
  • Unusual transmission noises under load

What to check

  • Read PCM/TCM for freeze-frame, full DTC list and MIL status
  • Record adaptation values and transmission-related PIDs with scan tool
  • Check battery and charging system voltage (at rest and while cranking)
  • Inspect transmission fluid level, color and smell (burnt or contaminated)
  • Visual inspection of TCM connectors, harness, and ground points for corrosion or damage
  • Check input and output speed sensor signals with scan tool or oscilloscope

Signal parameters

  • TCM adaptive/learned value counters (adaptation offsets)
  • Transmission input (turbine) speed (RPM)
  • Transmission output (vehicle) speed (RPM)
  • Line/gear pressure (if available via scan tool)
  • Torque converter clutch (TCC) duty cycle and apply status
  • Shift solenoid commanded vs actual states

Diagnostic algorithm

  1. Retrieve and record all stored codes, freeze-frame data and live PIDs. Note any other transmission or sensor codes.
  2. Verify battery/charging system health (voltage at idle and during cranking). Repair charging/battery faults before further testing.
  3. Inspect wiring and connectors to TCM, speed sensors, and solenoids. Repair any damage, corrosion or poor grounds.
  4. Check transmission fluid level, condition and temperature. Top up or replace fluid if level incorrect or fluid is contaminated/burnt.
  5. Compare input and output speed sensor readings on a road test with a scan tool. Look for inconsistent or missing signals indicating sensor or harness faults.
  6. Check operation of shift solenoids (command vs feedback) and measure line pressure if factory procedure available; replace faulty solenoids or valve body as indicated.
  7. Verify TCM software/calibration version and install manufacturer updates or reflashes if available. Some adaptations are reset or changed by updates.
  8. If no electrical or hydraulic faults found, attempt controlled adaptation reset/relearn per factory procedure and perform a clean road test to allow relearning.
  9. If adaptation immediately returns to limit or transmission slips/behaves badly, suspect internal mechanical wear (clutch packs, torque converter). Perform further mechanical diagnosis (pressure tests, teardown) or consult specialist.
  10. After repairs, clear codes and verify adaptation values return to expected range during verification drive. Document results and any parts replaced.

Likely causes

  • Adaptation limit reached because of long-term clutch wear or slipping
  • TCM learned values corrupted or overflowed due to repeated drivability issues
  • Battery/charging voltage drop during learning/reset events
  • Faulty input or output speed sensor giving incorrect speeds
  • Incorrect transmission fluid level or degraded fluid causing poor pressure
  • Electrical connector corrosion or wiring fault to TCM or solenoids

Fault status

⚠️ Status
Transmission adaptive learning value reached limit — TCM has flagged an adaptation overflow. Causes include electrical faults, low/contaminated fluid, mechanical wear, or software issues. Further diagnosis required.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-3 hours

Similar codes

P0740 P0715 P0720 P0730 P2763 P2780
413

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