Cause:
When replacing the pressure switch discs and seals, the plastic piston can become lost or damaged.
Correction:
Install a direct replacement Sonnax pressure switch plastic piston to salvage the expensive TEHCM.
Salvage the expensive TEHCM in this GM 6-speed transmission by replacing lost or damaged pistons with a direct replacement Sonnax pressure switch plastic piston 124740-72K. To replace an OE piston, simply clean debris from the pressure switch cavity using low air pressure (30 psi), then gently install a new piston.
Symptoms:
Cause:
When replacing the pressure switch discs and seals, the plastic piston can become lost or damaged.
Correction:
Install a direct replacement Sonnax pressure switch plastic piston to salvage the expensive TEHCM.
Salvage the expensive TEHCM in this GM 6-speed transmission by replacing lost or damaged pistons with a direct replacement Sonnax pressure switch plastic piston 124740-72K. To replace an OE piston, simply clean debris from the pressure switch cavity using low air pressure (30 psi), then gently install a new piston.