AutoCodes – Dodge – P0591 Dodge

P0591 Dodge Code - Speed Control Multiplexed Switch Performance

Quick Answer

The Powertrain Control Module (PCM) 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: P0591 Dodge 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 1,242

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 Nov 20, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0591 Dodge Description

The Powertrain Control Module (PCM) monitors the Speed Control Multiplexed Switch. The Diagnostic Trouble Code (DTC) will set when the Powertrain Control Module detects that the Speed Control signal voltage is implausible.

OBDII Code P0591 Dodge - Speed Control Multiplexed Switch Performance - AutoCodes.com — P0591 Dodge Code - Speed Control Multiplexed Switch Performance

What does this mean?

What are the Possible Causes of the DTC P0591 Dodge?

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

How to Fix the DTC P0591 Dodge?

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 P0591 Dodge 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 P0591 Dodge Code

1. What are some common symptoms of OBDII code P0591 in a Dodge vehicle?

The common symptoms of OBDII code P0591 in a Dodge vehicle include the speed control system not functioning properly, the cruise control not engaging, and the check engine light being illuminated.

2. What does the OBDII code P0591 indicate in a Dodge vehicle?

OBDII code P0591 in a Dodge vehicle indicates a malfunction in the speed control multiplexed switch performance.

3. What are the possible causes of OBDII code P0591 in a Dodge vehicle?

Possible causes of OBDII code P0591 in a Dodge vehicle include a faulty speed control multiplexed switch, wiring issues in the speed control system, or a problem with the PCM (powertrain control module).

4. How can I diagnose OBDII code P0591 in my Dodge vehicle?

Diagnosing OBDII code P0591 in a Dodge vehicle involves checking the speed control multiplexed switch for proper operation, inspecting the wiring for any damage or loose connections, and using a scan tool to retrieve the trouble code and data from the PCM.

5. Can I still drive my Dodge vehicle with OBDII code P0591 present?

It is generally safe to drive your Dodge vehicle with OBDII code P0591 present, but you may experience issues with the speed control system and cruise control functionality.

6. How can I repair OBDII code P0591 in my Dodge vehicle?

Repairing OBDII code P0591 in a Dodge vehicle may involve replacing the speed control multiplexed switch, repairing any damaged wiring, or reprogramming the PCM to address the issue.

7. Is it possible to reset OBDII code P0591 in a Dodge vehicle without repairs?

While you can clear the trouble code temporarily, OBDII code P0591 in a Dodge vehicle is likely to return if the underlying issue is not addressed through proper diagnostics and repairs.

8. Are there any DIY tips for troubleshooting OBDII code P0591 in a Dodge vehicle?

DIY tips for troubleshooting OBDII code P0591 in a Dodge vehicle include visually inspecting the speed control multiplexed switch and its wiring for any obvious issues before seeking professional assistance.

9. How much does it typically cost to fix OBDII code P0591 in a Dodge vehicle?

The cost of fixing OBDII code P0591 in a Dodge vehicle can vary depending on the specific cause of the issue, but it may involve parts and labor expenses ranging from $100 to $300 or more.

10. Can OBDII code P0591 in a Dodge vehicle cause any long-term damage if left unresolved?

While OBDII code P0591 may not cause immediate harm to your Dodge vehicle, leaving it unresolved could lead to continued issues with the speed control system and potentially affect the overall performance of the vehicle. It is recommended to address the problem promptly.