P078D

Shift Timing Solenoid B High

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–56 (est.)

Symptoms

Hard or abrupt gear shifts
Delays when shifting gears
Transmission transition to emergency mode
Increased fuel consumption
Check Engine Light Illuminates

Causes

Shift Solenoid B Malfunction
Open or short circuit in solenoid circuit
Poor contact in electrical wiring connectors
Transmission control module (TCM) malfunction
Problems with power or grounding of the circuit

How to Fix

Check resistance of shift solenoid B
Inspect the wiring harness and connectors for damage.
Check voltage and continuity of solenoid control circuit
Replace shift solenoid B if necessary
Scan the TCM for additional errors

Related codes

P078C P078E P079D