What are the common causes of P078E?

A solenoid B connector losing contact. Chafed wiring in the solenoid B harness. A solenoid B coil failing when hot. Dirty fluid carrying debris into the valve. A TCM fault on the solenoid B channel.

Road test and watch shift timing solenoid B data. Wiggle test the connector and harness. Measure the solenoid B resistance hot. Check the fluid level and condition. Replace the solenoid if the signal drops. Clear the code and retest.

P078E

Shift Timing Solenoid B Intermittent

System: Transmission (P code)
Lamp: Check Engine Light
Category: Powertrain - Transmission

What it means

P078E means Shift Timing Solenoid B Intermittent.

Where it lives

For P078E, start at the solenoid the description names.

Check these first

A solenoid B connector losing contact
Chafed wiring in the solenoid B harness
A solenoid B coil failing when hot
Dirty fluid carrying debris into the valve
A TCM fault on the solenoid B channel

What to do next

Road test and watch shift timing solenoid B data
Wiggle test the connector and harness
Measure the solenoid B resistance hot
Check the fluid level and condition
Replace the solenoid if the signal drops
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.