AutoCodes – Generic – P2778

P2778 Code - Upshift Switch Circuit Intermittent/Erratic

Quick Answer

The Engine Control Module (ECM) monitors the Upshift Switch Circuit signal. Common causes include Faulty Upshift Switch, Upshift Switch harness is open or shorted, Upshift 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: P2778 indicates Upshift Switch Circuit Intermittent/Erratic.
Common causes: Common causes include Faulty Upshift Switch, Upshift Switch harness is open or shorted, Upshift 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 4,130

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 13, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P2778 Description

The Engine Control Module (ECM) monitors the Upshift Switch Circuit signal. The ECM sets the OBDII code when the Upshift Switch Circuit signal is out of factory specifications.

OBDII Code P2778 - Upshift Switch Circuit Intermittent/Erratic - AutoCodes.com — P2778 Code - Upshift Switch Circuit Intermittent/Erratic

What does this mean?

What are the Possible Causes of the DTC P2778?

Faulty Upshift Switch
Upshift Switch harness is open or shorted
Upshift Switch circuit poor electrical connection

How to Fix the DTC P2778?

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 P2778 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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Information for Specific Makes

P2778 Dodge — Upshift Switch Circuit Intermittent/Erratic

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.