AutoCodes – Generic – P1890

P1890 Code - Shift Control System

Quick Answer

The P1890 Honda code refers to a shift control system malfunction in the vehicle. Common causes include Faulty Transmission Valve Body, Transmission Valve Body harness is open or shorted, Transmission Valve Body 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: P1890 indicates Shift Control System.
Common causes: Common causes include Faulty Transmission Valve Body, Transmission Valve Body harness is open or shorted, Transmission Valve Body 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 36,629

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 Oct 02, 2025

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1890 Description

The P1890 Honda code refers to a shift control system malfunction in the vehicle. This code is specifically related to the transmission system and indicates that there is an issue with the shift control mechanism. The shift control system is responsible for managing the shifting of gears in the transmission, ensuring smooth and accurate transitions between gears while driving. When this system malfunctions, it can lead to various performance issues and potentially cause long-term damage if not addressed promptly.

OBDII Code P1890 - Shift Control System - AutoCodes.com — P1890 Code - Shift Control System

What does this mean?

What are the Possible Causes of the DTC P1890?

Faulty Transmission Valve Body
Transmission Valve Body harness is open or shorted
Transmission Valve Body circuit poor electrical connection
Transmission mechanical problems

How to Fix the DTC P1890?

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 P1890 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.

Need more information about the P1890 code?

Need more information on how to fix the P1890 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1890 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1890 Buick — Throttle Position Signal Input
P1890 Cadillac — Throttle Position Signal Input
P1890 Chevrolet — Throttle Position Signal Input
P1890 GMC — Throttle Position Signal Input
P1890 Honda — Shift Control System

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.