Shift Timing Solenoid B High

Where it lives

For P078D, start at the solenoid the description names.

Check these first

• An open in the shift timing solenoid B circuit
• A shift timing solenoid B with high resistance
• A clogged transmission fluid filter starving the valve
• Corrosion at the solenoid B connector
• A TCM driver fault holding the channel high

What to do next

1. Read shift timing solenoid B voltage on a scan tool
2. Test the solenoid B circuit for an open
3. Measure the solenoid B resistance hot
4. Check the fluid filter and fluid condition
5. Replace the solenoid if the circuit is off spec
6. Clear the code and retest

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