P0756Powertrain
Powertrain · SAE
Shift Solenoid B Performance/Stuck Off
Meaning
The transmission control module has detected that shift solenoid B (SSB) is not delivering the expected hydraulic pressure: the solenoid is stuck in the de-energised (off) position or its performance does not match the command signal.
Common causes
- SSB solenoid mechanically stuck in the open (off) position due to deposits or wear
- Valve body with SSB valve blocked by sediment
- Degraded or contaminated ATF impairing hydraulic switching
- Clogged ATF filter reducing available pressure
- Open electrical circuit to SSB solenoid
- Internal TCM fault
Symptoms
- Check engine or transmission warning light on
- Failure to engage or abnormal engagement in SSB-governed gears
- Transmission in limp mode
- Harsh or missing gear changes
- Transmission overheating due to incorrect gear ratio
Severity
High: a stuck-off SSB impairs gear selection and causes accelerated clutch wear.
What to do
- Check ATF level and condition; replace if degraded
- Test SSB solenoid with a scan tool (commanded activation)
- Measure SSB solenoid resistance and verify supply at the connector
- Check hydraulic pressure in the SSB circuit with a gauge
- Replace SSB solenoid or clean/overhaul the valve body