AutoCodes – Ford – P0537 2003 Ford F150

P0537 2003 Ford F150 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 2003 Ford F150 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 1,913

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 2003 Ford F150 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 when the evaporator A/C Evaporator Temperature sensor reading falls below acceptable levels, and by engaging the A/C compressor clutch 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 2003 Ford F150 - A/C Evaporator Temperature Circuit Low Input - AutoCodes.com — P0537 2003 Ford F150 Code - A/C Evaporator Temperature Circuit Low Input

What does this mean?

What are the Possible Causes of the DTC P0537 2003 Ford F150?

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 2003 Ford F150?

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 2003 Ford F150 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 2003 Ford F150 Code

1. What are the common symptoms of OBDII code P0537 in a 2003 Ford F150 related to the A/C Evaporator Temperature Circuit Low Input?

- Common symptoms include the air conditioning not blowing cold air, inconsistent cooling performance, and possible illumination of the check engine light.

2. What could be causing the A/C Evaporator Temperature Circuit Low Input error code P0537 in a 2003 Ford F150?

- The code P0537 can be triggered by issues such as a faulty evaporator temperature sensor, damaged wiring or connectors, low refrigerant levels, or a malfunctioning A/C compressor.

3. How can I diagnose the A/C Evaporator Temperature Circuit Low Input problem in my 2003 Ford F150 with OBDII code P0537?

- To diagnose the issue, you may need to use an OBDII scanner to retrieve the code, visually inspect the wiring and connectors for damage, test the evaporator temperature sensor, and check the refrigerant levels in the A/C system.

4. Are there any quick repair tips for addressing the A/C Evaporator Temperature Circuit Low Input code P0537 in a 2003 Ford F150?

- Quick repair tips include checking and replacing any damaged wiring or connectors, testing and replacing the evaporator temperature sensor if necessary, and ensuring proper refrigerant levels in the A/C system.

5. Can I continue to drive my 2003 Ford F150 with the OBDII code P0537 related to the A/C Evaporator Temperature Circuit Low Input?

- It is generally not recommended to continue driving with the P0537 code unresolved, as it can lead to poor A/C performance and potential damage to other components in the air conditioning system.

6. How much does it cost to repair the A/C Evaporator Temperature Circuit Low Input issue causing OBDII code P0537 in a 2003 Ford F150?

- The cost of repair can vary depending on the exact cause of the issue, but it may involve replacing the evaporator temperature sensor, repairing wiring or connectors, or addressing any other underlying A/C system problems.

7. Can I reset the OBDII code P0537 in my 2003 Ford F150 without fixing the A/C Evaporator Temperature Circuit Low Input problem?

- While you can clear the code temporarily, it is important to address the root cause of the issue to prevent it from reoccurring and ensure proper functioning of the A/C system.

8. How long does it typically take to repair the A/C Evaporator Temperature Circuit Low Input issue associated with OBDII code P0537 in a 2003 Ford F150?

- The repair time can vary depending on the specific cause of the problem and the complexity of the repair, but it may take anywhere from a few hours to a full day to diagnose and fix the issue.

9. Will fixing the A/C Evaporator Temperature Circuit Low Input problem causing OBDII code P0537 improve the overall performance of the air conditioning system in my 2003 Ford F150?

- Yes, addressing the underlying issue causing the P0537 code can help restore proper A/C function, improve cooling performance, and prevent further damage to the system.

10. Is it possible to prevent the recurrence of OBDII code P0537 related to the A/C Evaporator Temperature Circuit Low Input in my 2003 Ford F150?

- Regular maintenance of the A/C system, checking refrigerant levels, and addressing any issues promptly can help prevent the reoccurrence of the P0537 code in the future.