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Engine-Codes – Generic – C1591

C1591 Code - Actuator Neutral Position Calibration Undone

Quick Answer

The C1591 diagnostic trouble code indicates that the actuator neutral position calibration is undone on the vehicle. Common causes include Sensor malfunction, Wiring issues, Actuator failure. 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
C1591 indicates Actuator Neutral Position Calibration Undone.
Common causes
Common causes include Sensor malfunction, Wiring issues, Actuator failure.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code C1591 Description

The C1591 diagnostic trouble code indicates that the actuator neutral position calibration is undone on the vehicle. This means that the system responsible for controlling the actuator, which is a device that moves or controls a mechanism, such as a throttle or valve, to achieve a desired output, is not properly calibrated to the neutral position. This can lead to issues with the vehicle's performance and overall operation.

OBDII Code C1591 - Actuator Neutral Position Calibration Undone
C1591 Code - Actuator Neutral Position Calibration Undone

Common Causes of C1591

  1. Sensor malfunction
  2. Wiring issues
  3. Actuator failure
  4. Software glitch
  5. Electrical problems

Symptoms of C1591

  1. Rough idling
  2. Poor acceleration
  3. Decreased fuel efficiency
  4. Engine stalling
  5. Check engine light illuminated

How to Fix C1591

  1. Perform a diagnostic scan to retrieve the trouble code and identify the exact cause of the issue.
  2. Inspect the actuator, sensors, and wiring for any visible damage or malfunctions.
  3. Recalibrate the actuator neutral position using specialized diagnostic equipment.
  4. Clear the trouble code from the vehicle's computer system.
  5. Test drive the vehicle to ensure the issue has been resolved and the code does not reappear.

Cost to Fix C1591

The typical repair costs for addressing the C1591 code can vary depending on the specific cause of the issue and the extent of the repairs needed. On average, the cost can range from $200 to $500, including parts and labor. However, it is important to note that diagnostic time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It is recommended to check with local auto repair shops for a more accurate estimate.

What does this mean?

Tech Notes for C1591

There is no malfunction if this DTC is not output again after performing VGRS system calibration.

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Code C1591 Information for Specific Makes

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 C1591 Code

1. What are common symptoms of OBDII code C1591 (Actuator Neutral Position Calibration Undone)?

- Common symptoms include rough idling, poor acceleration, and difficulty shifting gears.

2. What can cause OBDII code C1591 to trigger?

- This code can be triggered by a loss of power, a faulty actuator, or issues with the neutral position sensor.

3. How can I diagnose the cause of OBDII code C1591?

- Diagnosis involves checking the wiring, connectors, and components related to the actuator and neutral position sensor for any signs of damage or malfunction.

4. Can I drive my vehicle with OBDII code C1591 present?

- It is not recommended to drive with this code present, as it can lead to further damage if left unaddressed.

5. How can I reset OBDII code C1591?

- Resetting the code typically involves repairing the underlying issue causing the code to trigger and using an OBDII scanner to clear the code.

6. Is it possible to repair OBDII code C1591 on my own?

- While some basic troubleshooting steps can be taken, diagnosing and repairing this code may require specialized tools and expertise, so it is recommended to consult a professional mechanic.

7. What are some repair tips for OBDII code C1591?

- Inspect the actuator and neutral position sensor for any signs of wear or damage, and ensure all connections are secure and free of corrosion.

8. Can OBDII code C1591 be caused by a loose battery connection?

- Yes, a loose or weak battery connection can cause voltage fluctuations that may trigger this code, so it is important to check the battery connections as part of the diagnostic process.

9. How long does it usually take to repair OBDII code C1591?

- The repair time can vary depending on the specific cause of the code, but it typically takes a few hours to diagnose and fix the issue.

10. Are there any recalls related to OBDII code C1591?

- It is recommended to check with the vehicle manufacturer or a dealership to see if there are any recalls or technical service bulletins related to this code for your specific vehicle model.

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