AutoCodes – Ford – P0539 Ford

P0539 Ford Code - A/C Evaporator Temperature Circuit Intermittent

Quick Answer

The Powertrain Control Module (PCM) sources a low current 5 volts on the A/C Evaporator Temperature (ACET) sensor circuit. Common causes include Faulty A/C Evaporator Temperature Sensor, A/C Evaporator Temperature Sensor harness is open or shorted, A/C Evaporator Temperature Sensor circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: P0539 Ford indicates A/C Evaporator Temperature Circuit Intermittent.
Common causes: Common causes include Faulty A/C Evaporator Temperature Sensor, A/C Evaporator Temperature Sensor harness is open or shorted, A/C Evaporator Temperature Sensor circuit poor electrical connection.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 3,367

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0539 Ford Description

The Powertrain Control Module (PCM) sources a low current 5 volts on the A/C Evaporator Temperature (ACET) sensor circuit. As the A/C evaporator air temperature changes, the ACET circuit resistance changes (which changes the voltage the PCM detects).

OBDII Code P0539 Ford - A/C Evaporator Temperature Circuit Intermittent - AutoCodes.com — P0539 Ford Code - A/C Evaporator Temperature Circuit Intermittent

What does this mean?

What are the Possible Causes of the DTC P0539 Ford?

Faulty A/C Evaporator Temperature Sensor
A/C Evaporator Temperature Sensor harness is open or shorted
A/C Evaporator Temperature Sensor circuit poor electrical connection

How to Fix the DTC P0539 Ford?

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 P0539 Ford 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.

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Need Help with the Code?

Get the P0539 Ford code diagnosed by a professional: Find a repair shop in your area

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 P0539 Ford Code

1. What are common symptoms of OBDII code P0539 in a Ford related to the A/C evaporator temperature circuit intermittent issue?

Common symptoms include intermittent cooling performance from the A/C system, erratic temperature readings on the climate control panel, and in some cases, the A/C system may stop working altogether.

2. What are some possible causes of OBDII code P0539 (A/C Evaporator Temperature Circuit Intermittent) in a Ford?

Potential causes can include a faulty A/C evaporator temperature sensor, wiring or connector issues, a malfunctioning climate control module, or a problem with the A/C compressor.

3. How can I diagnose the root cause of OBDII code P0539 in my Ford related to the A/C evaporator temperature circuit intermittent issue?

Diagnosis typically involves checking the A/C evaporator temperature sensor for proper operation, inspecting the wiring and connectors for any damage or corrosion, and testing the climate control module and A/C compressor for functionality.

4. Are there any DIY repair tips for addressing OBDII code P0539 in a Ford due to the A/C evaporator temperature circuit intermittent issue?

If you have experience working on automotive electrical systems, you may be able to visually inspect the sensor, wiring, and connectors for any obvious issues. However, for a more accurate diagnosis and repair, it's recommended to consult a professional mechanic or dealership.

5. Can driving with OBDII code P0539 (A/C Evaporator Temperature Circuit Intermittent) in a Ford cause further damage to the vehicle?

Continuing to drive with this issue may lead to poor A/C performance, discomfort during hot weather, and potential strain on the A/C system components. It's best to address the problem promptly to avoid any long-term damage.

6. How much can I expect to pay to repair OBDII code P0539 in a Ford related to the A/C evaporator temperature circuit intermittent issue?

The cost of repair can vary depending on the root cause of the problem, the labor rates in your area, and whether new parts are needed. It's advisable to obtain estimates from multiple repair shops or dealerships to compare prices.

7. Is it safe to reset the OBDII code P0539 in a Ford without addressing the underlying issue related to the A/C evaporator temperature circuit intermittent problem?

Resetting the code without fixing the root cause may temporarily clear the warning light, but the issue will likely resurface. It's important to diagnose and repair the problem to ensure proper functioning of the A/C system.