AutoCodes – Generic – P078E

P078E Code - Shift Timing Solenoid 'B' Intermittent

Quick Answer

The Transmission Control Module (TCM) monitors the Shift Timing Solenoid 'B' circuit. Common causes include Faulty Shift Timing Solenoid 'B', Shift Timing Solenoid 'B' harness is open or shorted, Shift Timing Solenoid 'B' circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P078E indicates Shift Timing Solenoid 'B' Intermittent.
Common causes: Common causes include Faulty Shift Timing Solenoid 'B', Shift Timing Solenoid 'B' harness is open or shorted, Shift Timing Solenoid 'B' circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 2,417

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 08, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P078E Description

The Transmission Control Module (TCM) monitors the Shift Timing Solenoid 'B' circuit. The TCM sets the OBDII code when the Shift Timing Solenoid 'B' is out of factory specifications.

OBDII Code P078E - Shift Timing Solenoid 'B' Intermittent - AutoCodes.com — P078E Code - Shift Timing Solenoid 'B' Intermittent

What does this mean?

What are the Possible Causes of the DTC P078E?

Faulty Shift Timing Solenoid 'B'
Shift Timing Solenoid 'B' harness is open or shorted
Shift Timing Solenoid 'B' circuit poor electrical connection

How to Fix the DTC P078E?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P078E code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.