AutoCodes – Generic – P1593

P1593 Code - Altitude Adoption Signal Outside Tolerance

Quick Answer

Throttle control unit incorporates the following components: Throttle Position (TP) Sensor, Close Throttle Position (CTP) Switch (if fitted), Idle Speed Control (ISC) Actuator/Position Sensor or Throttle Motor/Position Sensor. Common causes include Faulty Throttle Control Unit, Throttle Control Unit harness is open or shorted, Throttle Control Unit circuit poor electrical connection. 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: P1593 indicates Altitude Adoption Signal Outside Tolerance.
Common causes: Common causes include Faulty Throttle Control Unit, Throttle Control Unit harness is open or shorted, Throttle Control Unit circuit poor electrical connection.
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 5,055

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 May 20, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1593 Description

OBDII Code P1593 - Altitude Adoption Signal Outside Tolerance - AutoCodes.com — P1593 Code - Altitude Adoption Signal Outside Tolerance

What does this mean?

What are the Possible Causes of the DTC P1593?

Faulty Throttle Control Unit
Throttle Control Unit harness is open or shorted
Throttle Control Unit circuit poor electrical connection

How to Fix the DTC P1593?

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 P1593 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 P1593 code?

Need more information on how to fix the P1593 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1593 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1593 Audi — Altitude Adoption Signal Outside Tolerance
P1593 BMW — Intake Manifold Air Control Solenoid ECM Output Stage
P1593 Chrysler — Speed Control Switch 1/2 Stuck
P1593 Dodge — Speed Control Switch 1/2 Stuck
P1593 Jeep — Speed Control Switch 1/2 Stuck
P1593 Volkswagen — Altitude Adoption Signal Outside Tolerance

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 P1593 Code

1. What are the common symptoms of OBDII code P1593 (Altitude Adoption Signal Outside Tolerance)?

The common symptoms include rough idling, poor acceleration, stalling, and potentially decreased fuel efficiency.

2. What are the possible causes of OBDII code P1593?

Possible causes of this code include a faulty altitude sensor, issues with the altitude sensor circuit, vacuum leaks, or a problem with the engine control module (ECM).

3. How serious is OBDII code P1593?

While this code may not always result in immediate engine failure, it is important to address it promptly to prevent potential performance issues and further damage to the vehicle.

4. Can I continue driving with OBDII code P1593 present?

It is not recommended to continue driving with this code, as it can lead to poor engine performance and potentially cause further damage to the vehicle over time.

5. How can I diagnose OBDII code P1593?

Diagnosing this code typically involves using a scan tool to retrieve the fault code, checking for any visible damage to the altitude sensor and its wiring, and testing the sensor's functionality.

6. How can I repair OBDII code P1593?

Repair options include replacing the altitude sensor if it is faulty, repairing any damaged wiring or connections, addressing vacuum leaks, and resetting the ECM to clear the code.

7. Is it possible to reset OBDII code P1593 without fixing the underlying issue?

While you can clear the code temporarily by resetting the ECM, it is crucial to address the root cause of the problem to prevent the code from reoccurring.

8. Can extreme changes in altitude trigger OBDII code P1593?

Yes, sudden or extreme changes in altitude can sometimes trigger this code if the altitude sensor fails to adjust properly to the new environmental conditions.

9. How long does it typically take to repair OBDII code P1593?

The repair time can vary depending on the specific cause of the code and the availability of replacement parts. In general, it may take a few hours to a day to diagnose and fix the issue.

10. Will OBDII code P1593 cause my vehicle to fail an emissions test?

Yes, if this code is present during an emissions test, it is likely to cause the vehicle to fail. It is important to address the issue and clear the code before attempting another emissions test.