Shift Timing Solenoid B Range/Performance

Where it lives

For P078B, the part to look at first is the solenoid named here.

Check these first

• A shift timing solenoid B coil drifting out of range
• An open or short in the solenoid B circuit
• Dirty fluid in the solenoid B valve
• Corrosion at the solenoid B connector
• A TCM driver fault on the solenoid B channel

What to do next

1. Read shift timing solenoid B data on a scan tool
2. Test the solenoid B circuit for an open or short
3. Measure the solenoid B resistance against spec
4. Check the fluid level and condition
5. Replace the solenoid if the coil is out of range
6. Clear the code and retest

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