The OBD-II code P0591 pertains to the cruise control system in your vehicle. It indicates a malfunction in the Multi-Function Input “B” circuit, which can affect the performance of your cruise control system.
What Does the P0591 Code Mean?
The P0591 code is triggered when the engine control module (PCM) detects an issue with the cruise control input switches. This could mean that the PCM is receiving conflicting signals from the cruise control switches, leading to the disabling of the cruise control functionality.
What Causes the P0591 Code?
Several factors can trigger the P0591 code, including:
- Cruise control switch failure
- Powertrain Control Module (PCM) failure
- Wiring issues in the cruise control circuit
What Are the Symptoms of the P0591 Code?
The primary symptom associated with the P0591 code is:
- The cruise control system will not operate.
How Serious Is the P0591 Code?
While the P0591 code is classified as a moderate severity issue, it does not pose an immediate threat to the vehicle’s safety or functionality. However, it is advisable to get it diagnosed in a reasonable timeframe to ensure the vehicle’s performance remains optimal.
How to Diagnose the P0591 Code
Diagnosing the P0591 code typically involves the following steps:
- Use an OBD-II scanner to confirm the presence of the P0591 code.
- Inspect the cruise control switches and wiring for damage or disconnections.
- Check the PCM for any fault codes that may indicate a malfunction.
- Test the cruise control system to determine if the issue is intermittent.
Common Repairs for the P0591 Code
Repairs for the P0591 code may include:
- Replacing faulty cruise control switches
- Repairing or replacing damaged wiring in the cruise control circuit
- Replacing the Powertrain Control Module (PCM) if it is found to be defective
How Much Does It Cost to Fix the P0591 Code?
The cost to fix the P0591 code can vary widely depending on the specific repairs needed. On average, labor and parts may range from $100 to $500. A thorough diagnosis by a certified mechanic can provide a more accurate estimate.
Can I Fix the P0591 Code Myself?
While some individuals with mechanical knowledge may be able to troubleshoot and fix issues related to the P0591 code, it is recommended to consult a professional mechanic for a proper diagnosis. They have the tools and expertise to accurately identify and repair the underlying causes.
