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P1507 Lexus Code - PTC AC Auxiliary Heater Disabled Low

Quick Answer

The P1507 diagnostic trouble code (DTC) for Lexus vehicles specifically refers to the PTC AC auxiliary heater being disabled due to low voltage. Common causes include Faulty PTC AC auxiliary heater, Damaged wiring or connectors, Malfunctioning control module. 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
P1507 Lexus indicates PTC AC Auxiliary Heater Disabled Low.
Common causes
Common causes include Faulty PTC AC auxiliary heater, Damaged wiring or connectors, Malfunctioning control module.
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 P1507 Lexus Description

The P1507 diagnostic trouble code (DTC) for Lexus vehicles specifically refers to the PTC AC auxiliary heater being disabled due to low voltage. The PTC (Positive Temperature Coefficient) heater is an electric heating element used in the vehicle's air conditioning system to provide additional warmth during colder temperatures. When this code appears, it indicates that the PTC AC auxiliary heater is not functioning properly, potentially leading to a lack of heat in the cabin during cold weather.

OBDII Code P1507 Lexus - PTC AC Auxiliary Heater Disabled Low
P1507 Lexus Code - PTC AC Auxiliary Heater Disabled Low

Common Causes of P1507 Lexus

  1. Faulty PTC AC auxiliary heater
  2. Damaged wiring or connectors
  3. Malfunctioning control module
  4. Low voltage in the electrical system
  5. Corrosion or rust affecting the heating system components

Symptoms of P1507 Lexus

  1. Lack of heat in the cabin during cold weather
  2. Slow or inadequate warming of the cabin
  3. Malfunctioning air conditioning system
  4. Dashboard warning light indicating a heating system issue

How to Fix P1507 Lexus

  1. Diagnose the issue using a diagnostic scanner to retrieve the specific trouble code
  2. Inspect the PTC AC auxiliary heater, wiring, and connectors for any signs of damage or corrosion
  3. Test the control module to ensure it is functioning correctly
  4. Repair or replace any faulty components, such as the PTC heater, wiring, or control module
  5. Clear the trouble code and test the heating system to ensure proper functionality

Cost to Fix P1507 Lexus

The typical repair costs for addressing a P1507 Lexus code can vary depending on the specific components that need to be repaired or replaced. In general, the cost of parts for a PTC AC auxiliary heater replacement can range from $200 to $500, while labor costs can add an additional $100 to $200. Overall, the total repair cost for resolving this issue may fall between $300 and $700, depending on the extent of the repairs needed.

When is the Code Detected?

Open or short to ground in the PTC heater permission signal line

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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 P1507 Lexus Code

1. What does the OBDII code P1507 mean on a Lexus?

P1507 indicates that the PTC (Positive Temperature Coefficient) AC auxiliary heater has been disabled due to a low voltage or related issue.

2. What are the common symptoms of code P1507 on a Lexus?

Symptoms may include reduced cabin heating performance, longer warm-up times for the interior, or no noticeable operation of the auxiliary heater.

3. What causes the P1507 code to appear on a Lexus?

Common causes include a faulty PTC auxiliary heater, wiring or connector issues, low battery voltage, or a malfunctioning control module.

4. Can a weak car battery cause the P1507 code to trigger?

Yes, insufficient battery voltage can prevent the PTC auxiliary heater from functioning properly and trigger the P1507 code.

5. How do I diagnose the P1507 code on my Lexus?

Start by checking the battery voltage, inspecting the wiring and connectors for damage or corrosion, and testing the PTC auxiliary heater for proper operation.

6. Can I drive my Lexus with a P1507 code?

Yes, you can drive the vehicle, but the cabin heating might be less effective, especially in cold weather.

7. How do I fix the P1507 code on a Lexus?

Repairs may include replacing the PTC auxiliary heater, repairing damaged wiring or connectors, or addressing low battery voltage.

8. Is the P1507 code related to the main AC system?

No, the P1507 code specifically pertains to the auxiliary heater, which assists in warming the cabin and is separate from the main AC cooling system.

9. How much does it cost to fix the P1507 code on a Lexus?

Repair costs depend on the root cause but may range from $100 for wiring repairs to over $500 if the PTC auxiliary heater needs replacement.

10. Will clearing the P1507 code fix the issue permanently?

Clearing the code may temporarily remove it, but the underlying issue must be addressed to prevent it from returning.

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