AutoCodes – Generic – P0590

P0590 Code - Speed Control Multiplexed Switch Performance

Quick Answer

The Engine Control Module (ECM) monitors the Speed Control Multiplexed Switch. Common causes include Faulty Speed Control Switch, Speed Control Switch harness is open or shorted, Speed Control Switch circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: P0590 indicates Speed Control Multiplexed Switch Performance.
Common causes: Common causes include Faulty Speed Control Switch, Speed Control Switch harness is open or shorted, Speed Control Switch circuit poor electrical connection.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 6,299

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 28, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P0590 Description

The Engine Control Module (ECM) monitors the Speed Control Multiplexed Switch. The ECM sets the OBDII code when the Speed Control Multiplexed Switch is not to factory specifications.

OBDII Code P0590 - Speed Control Multiplexed Switch Performance - AutoCodes.com — P0590 Code - Speed Control Multiplexed Switch Performance

What does this mean?

What are the Possible Causes of the DTC P0590?

Faulty Speed Control Switch
Speed Control Switch harness is open or shorted
Speed Control Switch circuit poor electrical connection

How to Fix the DTC P0590?

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 P0590 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.

Frequently Asked Questions about P0590 Code

No Frequently Asked Questions about P0590 Code found.

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MikeN445
Date: February 24, 2016 at 5:16 pm

What is this switch? Where is it located? When searching the internet, it only finds things on the cruise control, which I do NOT have.

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OBDIITech
Date: February 24, 2016 at 5:54 pm

What model and year is your vehicle? every vehicle has different component location

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