AutoCodes – Jeep – P0591 Jeep

P0591 Jeep 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 Jeep 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 2,185

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

What does this mean?

What are the Possible Causes of the DTC P0591 Jeep?

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 Jeep?

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 Jeep 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 Jeep Code

1. What are common symptoms of OBDII code P0591 in a Jeep related to the Speed Control Multiplexed Switch Performance?

- Common symptoms include the speed control system not working properly, illuminated malfunction indicator light (MIL), and potential issues with cruise control functionality.

2. What can cause OBDII code P0591 to trigger in a Jeep?

- The code P0591 is typically triggered by a fault in the speed control multiplexed switch circuit, which can be caused by a faulty switch, wiring issues, or a malfunctioning control module.

3. How can I diagnose the cause of OBDII code P0591 in my Jeep?

- Diagnosing OBDII code P0591 usually involves inspecting the speed control multiplexed switch, checking the wiring for any damage or corrosion, and using a diagnostic scan tool to pinpoint the exact cause of the issue.

4. Can I still drive my Jeep with OBDII code P0591 present?

- It is generally safe to drive your Jeep with code P0591, but it is recommended to address the issue promptly to prevent any potential safety hazards or further damage to the vehicle's systems.

5. What are some repair tips for fixing OBDII code P0591 in a Jeep?

- Repairing code P0591 may involve replacing the speed control multiplexed switch, repairing any damaged wiring, or reprogramming the control module. It is advisable to consult a professional mechanic for accurate diagnosis and repair.

6. Will resetting the OBDII code P0591 clear the issue in my Jeep?

- Simply resetting the code may temporarily clear the MIL, but it will not fix the underlying issue causing code P0591. It is crucial to address the root cause of the problem to prevent the code from reoccurring.

7. Can a DIY enthusiast fix OBDII code P0591 in a Jeep?

- While some basic troubleshooting steps can be performed by a DIY enthusiast, diagnosing and repairing OBDII code P0591 may require specialized tools and technical knowledge. It is recommended to seek professional assistance for accurate repair.

8. How much does it cost to repair OBDII code P0591 in a Jeep?

- The cost of repairing OBDII code P0591 in a Jeep can vary depending on the exact cause of the issue, parts needed for replacement, and labor costs. It is advisable to obtain quotes from different mechanics for an accurate estimate.

9. Are there any recalls or technical service bulletins related to OBDII code P0591 in Jeeps?

- It is recommended to check with the manufacturer or authorized dealerships for any recalls or technical service bulletins related to OBDII code P0591 in Jeeps, as there may be relevant information or solutions provided by the manufacturer.

10. How can I prevent OBDII code P0591 from occurring in my Jeep in the future?

- To prevent OBDII code P0591 from occurring in the future, it is essential to perform regular maintenance checks on the speed control system, including inspecting the multiplexed switch, keeping wiring connections secure, and addressing any issues promptly.