AutoCodes – Ford – P0537 Ford

P0537 Ford 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 Ford 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 8,837

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
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P0537 Ford 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 Ford - A/C Evaporator Temperature Circuit Low Input - AutoCodes.com — P0537 Ford Code - A/C Evaporator Temperature Circuit Low Input

What does this mean?

What are the Possible Causes of the DTC P0537 Ford?

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 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 does this mean?

Code Tech Notes

User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0537 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.

Need more information about the P0537 Ford code?

Need more information on how to fix the P0537 Ford code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0537 Ford code diagnosed by a professional: Find a repair shop in your area

Information for Specific Ford Models

P0537 1997 Ford F150 — A/C Evaporator Temperature Circuit Low Input
P0537 1998 Ford F150 — A/C Evaporator Temperature Circuit Low Input
P0537 1999 Ford F150 — A/C Evaporator Temperature Circuit Low Input
P0537 2000 Ford F150 — A/C Evaporator Temperature Circuit Low Input
P0537 2001 Ford F150 — A/C Evaporator Temperature Circuit Low Input
P0537 2002 Ford F150 — A/C Evaporator Temperature Circuit Low Input
P0537 2003 Ford F150 — A/C Evaporator Temperature Circuit Low Input
P0537 2006 Ford Fusion — A/C Evaporator Temperature Circuit Low
P0537 2007 Ford Fusion — A/C Evaporator Temperature Circuit Low
P0537 2008 Ford Fusion — A/C Evaporator Temperature Circuit Low
P0537 2009 Ford Fusion — A/C Evaporator Temperature Circuit Low
P0537 2010 Ford Fusion — A/C Evaporator Temperature Circuit Low
P0537 2011 Ford Fusion — A/C Evaporator Temperature Circuit Low
P0537 2012 Ford Fusion — A/C Evaporator Temperature Circuit Low

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.