Whenever you work on your transmission or install a new car battery, the ECU must complete a process called adaptive learning, where the computer and transmission essentially synchronize. If this process was not completed for any reason, a DTC P0949 will be recorded.
How severe is the code?
Diagnostic code P0949 is not extremely severe, but the driving issues associated with it can be extremely annoying.
Symptoms
Symptoms of a P0949 include:
Irregular shifting
Causes
Transmission adaptive learning procedure not completed
How to diagnose the code?
If your vehicle has an OBDII trouble code P0949, a technician will need to connect the diagnostic computer to the vehicle’s OBD2 port, then reset the ECU to adaptive learning mode.
What repairs will fix P0949?
Complete transmission adaptive learning procedure