P0949

Code

Generic P — Powertrain

Auto Shift Manual Adaptive Learning Not Complete

Brand: Generic

Type: P — Powertrain

Views: UK: 25 EN: 88 RU: 40

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Incomplete or interrupted adaptive relearn/initialization procedure
Low or unstable battery voltage during relearn
Faulty transmission fluid level, condition, or temperature outside relearn range
Faulty or intermittent wiring/connectors between TCM and sensors/actuators
Defective wheel/vehicle speed sensor(s) or input/turbine speed sensor
Faulty shift solenoid(s) or valve body hydraulic issue

Symptoms

MIL (Check Engine Light) may be illuminated
Transmission may run in default shift strategy or limp mode until relearn completes
Harsh, late, or erratic upshifts/downshifts
Surging or gear hunting during acceleration
Transmission may not select expected gears in manual/ASM modes
Inconsistent shift feel after battery disconnect or repairs

What to check

Read and record freeze frame and full DTC list from the TCM/PCM using scan tool
Verify battery voltage at rest and during cranking (should be >12.4 V at rest, >10 V when cranking)
Visually inspect battery terminals and chassis/engine grounds for corrosion/tightness
Check transmission fluid level and condition; correct level and fluid temperature required for relearn
Check for additional transmission-related codes (speed sensors, solenoids, wiring faults)
Inspect wiring and connectors at TCM and transmission for damage, corrosion, or loose pins

Signal parameters

Battery voltage: stable >12.4 V resting, >13.5 V with engine running
Vehicle speed (VSS): accurate, no dropouts during drive cycle
Input/turbine speed: present and correlates with engine RPM and vehicle speed
Transmission fluid temperature: within relearn allowed range (typically 20–100 °C depending on manufacturer)
Shift solenoid control: ON/OFF commands from TCM and corresponding current/voltage responses
CAN bus communication: no errors between TCM and ECM (normal message traffic)

Diagnostic algorithm

Connect a capable scan tool and retrieve DTCs and freeze frame; note transmission-related codes. Do not assume P0949 alone is root cause.
Verify battery condition and charging system. Recharge or replace battery and confirm good grounds and terminal condition before proceeding.
Check transmission fluid level and condition at specified temperature; top or replace fluid if low/contaminated. Correct fluid level is required for proper shift behavior and relearn.
Inspect wiring/connectors to TCM, speed sensors, and solenoid pack for damage or corrosion; repair any faults.
Scan live data while driving or on lift (per manual): confirm VSS and input speed sensors provide stable, correlated signals and that TCM is commanding solenoids and receiving expected responses.
Repair any sensor or solenoid faults found (replace faulty VSS, input speed sensor, or solenoid as needed). Clear codes and recheck for recurrence.
If no electrical or mechanical faults are found, perform the manufacturer-approved Auto Shift Manual/ASM adaptive relearn procedure using factory-level scan tool or prescribed drive cycle. Ensure battery voltage and transmission temperature are within specified ranges during relearn.
After relearn completes, clear codes, then road test through conditions required to verify stable shifts and confirm P0949 does not return.
If relearn cannot complete or code returns, check TCM software level and consider reflash/update or TCM replacement per manufacturer guidance.
If intermittent communications or multiple control modules report errors, diagnose CAN bus integrity and related modules before repeating relearn.

Likely causes

Battery discharged or poor battery connections during relearn
Low transmission fluid level or severely degraded fluid preventing proper shifts
Damaged VSS or input speed sensor producing no/erratic speed signal
Open/short in shift solenoid circuit or failing solenoid
Poor ground or connector corrosion at TCM or transmission harness
TCM stored adaptive data erased after repair or battery disconnect and relearn not performed

Fault status

⚠️ Status

TCM reports Auto Shift Manual adaptive learning incomplete. Required adaptive data not stored or relearn interrupted; relearn or repair required before normal ASM operation is assured.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours