AutoCodes – Mercury – P0537 Mercury

P0537 Mercury Code - A/C Evaporator Temperature Circuit Low Input

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 Mercury indicates A/C Evaporator Temperature Circuit Low Input.
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 478

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
Cost to Diagnose
FAQs
Comments
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Code P0537 Mercury 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 Mercury - A/C Evaporator Temperature Circuit Low Input - AutoCodes.com — P0537 Mercury Code - A/C Evaporator Temperature Circuit Low Input

What does this mean?

What are the Possible Causes of the DTC P0537 Mercury?

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 Mercury?

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 P0537 Mercury 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 Mercury Code

1. What are common symptoms of OBDII code P0537 in a Mercury related to the A/C evaporator temperature circuit?

- Common symptoms include poor or lack of cooling from the A/C system, the A/C system may not engage, and the air blowing from the vents may not be as cold as expected.

2. What are potential causes of OBDII code P0537 in a Mercury indicating a low input from the A/C evaporator temperature circuit?

- Possible causes include a faulty A/C evaporator temperature sensor, damaged wiring or connectors in the circuit, low refrigerant levels in the A/C system, or a malfunctioning A/C control module.

3. How can I diagnose the underlying issue causing OBDII code P0537 in my Mercury's A/C system?

- To diagnose the issue, you can use a scan tool to read and interpret the code, visually inspect the wiring and connectors for any damage, test the A/C evaporator temperature sensor, and check the refrigerant levels in the A/C system.

4. Can I continue driving my Mercury with OBDII code P0537 related to the A/C evaporator temperature circuit low input?

- It is not recommended to continue driving with this code as it can lead to further damage to the A/C system and potentially affect the overall performance of the vehicle's climate control system.

5. What are some repair tips for resolving OBDII code P0537 in a Mercury due to a low input from the A/C evaporator temperature circuit?

- Repair tips may include replacing the faulty A/C evaporator temperature sensor, repairing any damaged wiring or connectors, recharging the refrigerant in the A/C system, or resetting the A/C control module.

6. How much does it typically cost to repair OBDII code P0537 in a Mercury caused by a low input from the A/C evaporator temperature circuit?

- The cost of repairs can vary depending on the exact cause of the issue, but it may range from $100 to $300 for parts and labor.

7. Are there any DIY solutions for fixing OBDII code P0537 in a Mercury related to the A/C evaporator temperature circuit?

- While some basic troubleshooting steps can be done at home, it is recommended to consult a professional mechanic for a thorough diagnosis and repair to ensure the issue is properly resolved.

8. Can OBDII code P0537 in a Mercury be a false alarm or intermittent issue related to the A/C evaporator temperature circuit?

- In some cases, the code may be triggered by a temporary sensor glitch or electrical issue. However, it is important to address the problem promptly to prevent any potential long-term issues with the A/C system.

9. Will resetting the OBDII code P0537 in my Mercury temporarily fix the issue with the A/C evaporator temperature circuit low input?

- Resetting the code may temporarily clear the warning light, but it will not fix the underlying problem causing the low input from the A/C evaporator temperature circuit. It is recommended to diagnose and address the root cause of the issue.

10. How can I prevent OBDII code P0537 from recurring in my Mercury's A/C system after repairing the low input from the evaporator temperature circuit?

- Regular maintenance of the A/C system, checking refrigerant levels, keeping the evaporator temperature sensor clean, and addressing any wiring issues promptly can help prevent the recurrence of OBDII code P0537 in the future.