P1585 DTC Code: Causes, Symptoms, and Solutions


In the automotive universe, DTC codes play a crucial role in diagnosing and resolving issues within a vehicle’s systems. One such code that may pop up on your diagnostic scanner is the P1585 DTC code. This code pertains to a specific problem related to the throttle position sensor (TPS) circuit. If you encounter this code, it is important to address it promptly to prevent any further damage to your vehicle. In this article, we will dive deep into understanding the P1585 DTC code, its causes, symptoms, and potential solutions.

Understanding the P1585 DTC Code

The P1585 DTC code refers to a fault detected in the throttle position sensor, commonly known as the TPS. The TPS is responsible for monitoring the position of the throttle plate in relation to the accelerator pedal. It provides crucial information to the engine control module (ECM) to ensure proper fuel delivery and optimal performance.

Causes of the P1585 DTC Code

Several factors can trigger the P1585 DTC code to illuminate on your vehicle’s dashboard. Understanding these causes is essential to pinpointing the exact issue and implementing appropriate solutions. Here are some common causes behind the P1585 DTC code:

  1. Faulty TPS: The most likely cause of the P1585 DTC code is a defective or malfunctioning throttle position sensor. Over time, the TPS can wear out or become damaged due to excessive heat, electrical issues, or general wear and tear. A faulty TPS can affect the engine’s performance by providing inaccurate data to the ECM.

  2. Wiring or connector issues: Another common cause of the P1585 DTC code is a problem within the wiring harness or connectors related to the throttle position sensor. Corroded connections, loose wires, or damaged harnesses can disrupt the signal transmission, leading to the code’s appearance.

  3. ECM malfunction: In some cases, the P1585 DTC code may be triggered due to an internal malfunction within the engine control module. If the ECM fails to receive accurate data from the TPS, it may set off this code as a safety measure.

Symptoms of the P1585 DTC Code

Identifying the symptoms associated with the P1585 DTC code is crucial in diagnosing the issue and taking appropriate action promptly. Here are some common signs that may accompany the P1585 DTC code:

  1. Engine performance issues: A malfunctioning throttle position sensor can result in irregular engine performance. You may experience hesitation, rough idling, or poor acceleration. The engine may also struggle to maintain a consistent idle speed.

  2. Poor fuel efficiency: The inaccurate data provided by a faulty TPS can disrupt the ideal fuel delivery to the engine. As a result, you may notice a decrease in fuel efficiency, requiring frequent refueling.

  3. Illuminated check engine light: The P1585 DTC code triggers the check engine light on your dashboard as a warning. If you observe the check engine light illuminated, it is crucial to have your vehicle inspected and diagnose the root cause of the issue.

Resolving the P1585 DTC Code

Once you have identified the P1585 DTC code and experienced the associated symptoms, it is time to tackle the problem head-on. Here are some potential solutions to resolve the P1585 DTC code:

  1. Inspect and replace the throttle position sensor: Begin by examining the throttle position sensor for any visible signs of damage or wear. If you notice any issues, it is recommended to replace the TPS with a new and compatible unit. Ensure that the replacement sensor is properly calibrated to avoid any future complications.

  2. Check wiring and connectors: Thoroughly inspect the wiring harness and connectors associated with the throttle position sensor. Look for any signs of corrosion, loose connections, or damaged wires. Clean or repair the affected components as necessary to restore the proper signal transmission.

  3. Verify ECM functionality: If the above steps do not resolve the P1585 DTC code, it is essential to ensure that the engine control module is functioning correctly. Consult a professional mechanic or use specialized diagnostic equipment to evaluate the ECM’s performance and make any necessary repairs or replacements.

Frequently Asked Questions (FAQs)

Q1. Can I continue driving my vehicle with the P1585 DTC code?

A1. It is generally not advised to drive your vehicle with the P1585 DTC code illuminated. While your vehicle may still be operable, a faulty throttle position sensor can affect the engine’s performance, potentially leading to further damage if left unresolved. It is recommended to address the issue promptly.

Q2. Can I reset the P1585 DTC code using an OBD-II scanner?

A2. While resetting the code using an OBD-II scanner may temporarily clear the check engine light, it does not fix the underlying problem. It is crucial to diagnose the root cause of the code and apply the appropriate solutions to prevent its reoccurrence.

Q3. Can a DIY enthusiast resolve the P1585 DTC code at home?

A3. Depending on your mechanical skills and experience, some steps involved in resolving the P1585 DTC code may be manageable at home. However, diagnosing and repairing complex electrical issues may require professional expertise. It is advisable to consult a qualified mechanic if you are unsure or lack experience.


The P1585 DTC code relates to a fault within the throttle position sensor circuit of your vehicle. Understanding the causes, symptoms, and solutions associated with this code is crucial in maintaining optimal engine performance. By identifying and addressing the underlying issue promptly, you can prevent further damage and ensure the smooth operation of your vehicle. If you are uncertain about diagnosing or resolving the P1585 DTC code, consulting a professional mechanic is always a wise decision.

About author


Meet Sam Mitchell, your experienced and reliable guide in the complex world of car fault codes. With a robust career spanning over 15 years as a professional car mechanic, John has the skills, knowledge, and practical experience to help you navigate car fault issues with confidence.


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