AutoCodes – Generic – C1591

C1591 Code - Actuator Neutral Position Calibration Undone

Quick Answer

If the Steering Control ECU or steering actuator is replaced, or if the tie-rod ends are adjusted, Variable Gear Ratio Steering (VGRS) system calibration is required. Common causes include Actuator Neutral Position Calibration. 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 Actuator Neutral Position Calibration.
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.

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Code Popularity 2,021

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 05, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code C1591 Description

If the Steering Control ECU or steering actuator is replaced, or if the tie-rod ends are adjusted, Variable Gear Ratio Steering (VGRS) system calibration is required. If the Steering Control ECU detects that steering angle adjustment is incomplete, it will store the Diagnostic Trouble Code (DTC) C1591.

OBDII Code C1591 - Actuator Neutral Position Calibration Undone - AutoCodes.com — C1591 Code - Actuator Neutral Position Calibration Undone

What does this mean?

What are the Possible Causes of the DTC C1591?

Actuator Neutral Position Calibration

How to Fix the DTC C1591?

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 does this mean?

Code Tech Notes

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

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C1591 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.

Need more information about the C1591 code?

Need more information on how to fix the C1591 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1591 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C1591 Lexus — Actuator Neutral Position Calibration Undone
C1591 Scion — Actuator Neutral Position Calibration Undone
C1591 Toyota — Actuator Neutral Position Calibration Undone

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.