AutoCodes – Ford – P0537 2008 Ford Fusion

P0537 2008 Ford Fusion Code - A/C Evaporator Temperature Circuit Low

Quick Answer

The A/C Evaporator Temperature (ACET) sensor contains a thermistor which receives a reference voltage from the Powertrain Control Module (PCM). Common causes include Faulty A/C Evaporator Temperature (ACET) 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: P0537 2008 Ford Fusion indicates A/C Evaporator Temperature Circuit Low .
Common causes: Common causes include Faulty A/C Evaporator Temperature (ACET) 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 1,933

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 Jul 28, 2020

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P0537 2008 Ford Fusion Description

The A/C Evaporator Temperature (ACET) sensor contains a thermistor which receives a reference voltage from the Powertrain Control Module (PCM). The thermistor then varies the resistance to the reference voltage based on the evaporator discharge air temperature. The resulting voltage is returned to the PCM where it is interpreted as an evaporator discharge air temperature reading.
The PCM maintains evaporator core temperature and prevents icing of the evaporator core, by disengaging the A/C compressor clutch (non-hybrid) or decreasing the electric A/C compressor speed (hybrid) when the evaporator A/C Evaporator Temperature sensor reading falls below acceptable levels, and by engaging the A/C compressor clutch (non-hybrid) or increasing the electric A/C compressor speed (hybrid) when the discharge air temperature rises above acceptable levels.
The A/C Evaporator Temperature sensor is located inside of the heater core and evaporator core housing in the air-stream leaving the evaporator core.
The Diagnostic Trouble Code (DTC) Indicates the ACET signal input is less than Self-Test minimum. The Self-Test minimum is 0.13 volts.

OBDII Code P0537 2008 Ford Fusion - A/C Evaporator Temperature Circuit Low - AutoCodes.com — P0537 2008 Ford Fusion Code - A/C Evaporator Temperature Circuit Low

What does this mean?

What are the Possible Causes of the DTC P0537 2008 Ford Fusion?

Faulty A/C Evaporator Temperature (ACET) Sensor
A/C Evaporator Temperature Sensor harness is open or shorted
A/C Evaporator Temperature Sensor circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P0537 2008 Ford Fusion?

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

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0537 2008 Ford Fusion 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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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 P0537 2008 Ford Fusion Code

1. What are the common symptoms of OBDII code P0537 in a 2008 Ford Fusion related to the A/C Evaporator Temperature Circuit Low?

Symptoms may include reduced cooling performance from the air conditioning system, inconsistent temperature output, and potential triggering of the A/C system warning light.

2. What are the possible causes of OBDII code P0537 in a 2008 Ford Fusion?

Common causes may include a faulty A/C evaporator temperature sensor, wiring issues or corrosion in the sensor circuit, a malfunctioning HVAC control module, or a refrigerant leak affecting the temperature readings.

3. How can I diagnose the A/C Evaporator Temperature Circuit Low issue in my 2008 Ford Fusion?

Diagnosis typically involves using an OBDII scanner to retrieve the specific code, inspecting the A/C system components for visible damage or leaks, testing the evaporator temperature sensor, and checking the wiring connections for any issues.

4. Can I continue driving my 2008 Ford Fusion with OBDII code P0537 related to the A/C Evaporator Temperature Circuit Low?

While the vehicle may still be operable, it is recommended to address the issue promptly to prevent further damage to the A/C system or potential discomfort due to inadequate cooling performance.

5. How can I repair OBDII code P0537 in my 2008 Ford Fusion myself?

Depending on the root cause, DIY repair options may include replacing the A/C evaporator temperature sensor, repairing any damaged wiring or connectors, or resetting the HVAC control module after addressing the underlying issue.

6. Is it necessary to reset the OBDII code P0537 in a 2008 Ford Fusion after fixing the A/C Evaporator Temperature Circuit Low problem?

Yes, it is important to clear the diagnostic trouble code using an OBDII scanner after repairing the issue to reset the system and ensure that the warning light does not reappear.

7. Can extreme weather conditions affect the occurrence of OBDII code P0537 in a 2008 Ford Fusion?

Extreme temperatures, both hot and cold, can potentially impact the A/C system and the evaporator temperature readings, leading to the triggering of the A/C Evaporator Temperature Circuit Low code.

8. How much does it typically cost to repair OBDII code P0537 related to the A/C Evaporator Temperature Circuit Low in a 2008 Ford Fusion?

The cost of repairs can vary depending on the specific cause of the issue, but it may range from around $100 to $300 for parts and labor, excluding any additional diagnostics or related repairs.

9. Are there any preventive maintenance steps I can take to avoid OBDII code P0537 in my 2008 Ford Fusion?

Regularly servicing the A/C system, checking for refrigerant leaks, ensuring proper wiring connections, and monitoring the overall performance of the air conditioning system can help prevent issues leading to the A/C Evaporator Temperature Circuit Low code.