Shift Timing Solenoid B Low

Where it lives

For P078C, the description names the solenoid as the part involved.

Check these first

• A short to ground in the solenoid B circuit
• A shift timing solenoid B with low resistance
• A partially backed out connector pin at solenoid B
• Low or dirty transmission fluid
• A weak TCM output on the solenoid B channel

What to do next

1. Read shift timing solenoid B voltage on a scan tool
2. Test the solenoid B circuit for a short to ground
3. Measure the solenoid B resistance
4. Check the connector pins and fluid level
5. Replace the solenoid if the circuit tests good
6. Clear the code and retest

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