AutoCodes – Honda – P0816 Honda

P0816 Honda Code - Short In Transmission Gear Selection Switch Upshift/Dowshift Switch Circuit

Quick Answer

The Transmission Control Module (TCM) monitors the Downshift Switch Circuit signal. Common causes include Faulty Transmission Gear Selection Switch, Transmission Gear Selection Switch harness is open or shorted, Transmission Gear Selection 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: P0816 Honda indicates Short In Transmission Gear Selection Switch Upshift/Dowshift Switch Circuit.
Common causes: Common causes include Faulty Transmission Gear Selection Switch, Transmission Gear Selection Switch harness is open or shorted, Transmission Gear Selection 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 2,600

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 09, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P0816 Honda Description

The Transmission Control Module (TCM) monitors the Downshift Switch Circuit signal. The TCM sets the OBDII code when the Downshift Switch Circuit signal is not to factory specifications.

OBDII Code P0816 Honda - Short In Transmission Gear Selection Switch Upshift/Dowshift Switch Circuit - AutoCodes.com — P0816 Honda Code - Short In Transmission Gear Selection Switch Upshift/Dowshift Switch Circuit

What does this mean?

What are the Possible Causes of the DTC P0816 Honda?

Faulty Transmission Gear Selection Switch
Transmission Gear Selection Switch harness is open or shorted
Transmission Gear Selection Switch circuit poor electrical connection

How to Fix the DTC P0816 Honda?

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 P0816 Honda 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.