AutoCodes – Generic – P278D

P278D Code - Kick Down Switch Circuit High

Quick Answer

The Transmission Control Module (TCM) monitors the Kick Down Switch Circuit signal. Common causes include Faulty Kick Down Switch, Kick Down Switch harness is open or shorted, Kick Down Switch 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: P278D indicates Kick Down Switch Circuit High.
Common causes: Common causes include Faulty Kick Down Switch, Kick Down Switch harness is open or shorted, Kick Down Switch 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 3,400

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 Feb 14, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P278D Description

The Transmission Control Module (TCM) monitors the Kick Down Switch Circuit signal. The TCM sets the OBDII code when the Kick Down Switch Circuit signal is out of factory specifications.

OBDII Code P278D - Kick Down Switch Circuit High - AutoCodes.com — P278D Code - Kick Down Switch Circuit High

What does this mean?

What are the Possible Causes of the DTC P278D?

Faulty Kick Down Switch
Kick Down Switch harness is open or shorted
Kick Down Switch circuit poor electrical connection

How to Fix the DTC P278D?

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 P278D 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.