This code indicates that the TCM has detected a problem with the transmission. This can be caused by a variety of factors, including:
- Faulty TCM
- Transmission fluid problems
- Faulty sensors or solenoids
- Mechanical issues with the transmission
P1456 - Vehicle Speed Sensor (VSS) Intermittent Signal
This code indicates that the VSS is not sending a consistent signal to the TCM. This can be caused by a variety of factors, including:
- Faulty VSS
- Damaged wiring
- Problems with the PCM or TCM
Both of these codes can cause problems with the transmission, including:
- Shifting problems
- Slipping
- Stalling
- Reduced fuel economy
If you are experiencing any of these problems, it is important to have your car diagnosed by a qualified mechanic.
Here are some things you can do to try to fix these codes:
- Check the transmission fluid level and condition.
- Inspect the wiring to the TCM and VSS for damage.
- Clean the VSS and its connections.
- Replace the VSS if it is faulty.
- Have the TCM diagnosed by a qualified mechanic.
If you are unable to fix these codes yourself, it is important to have your car repaired by a qualified mechanic.