P0537 2009 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 2009 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.
Code P0537 2009 Ford Fusion Description
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.
What are the Possible Causes of the DTC P0537 2009 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 2009 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 is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0537 2009 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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Frequently Asked Questions about P0537 2009 Ford Fusion Code
1. What does OBDII code P0537 mean on a 2009 Ford Fusion?
Code P0537 indicates that the A/C evaporator temperature circuit is reading a voltage lower than expected, which can interfere with proper air conditioning operation.
2. What are common symptoms of code P0537 in a 2009 Ford Fusion?
Symptoms may include reduced or no air conditioning performance, inconsistent cabin cooling, or the A/C system not engaging at all.
3. What causes code P0537 in a 2009 Ford Fusion?
Common causes include a faulty evaporator temperature sensor, damaged wiring or connectors, or issues with the A/C control module.
4. Can I drive my 2009 Ford Fusion with code P0537 active?
Yes, you can drive the car, but you may experience discomfort due to reduced or non-functional A/C, especially in hot weather.
5. How do I diagnose code P0537 on a 2009 Ford Fusion?
Start by checking the evaporator temperature sensor and its wiring for damage or loose connections. Use a multimeter to test the sensor's resistance and compare it to factory specifications.
6. How can I fix code P0537 on my 2009 Ford Fusion?
Repairs may involve replacing the evaporator temperature sensor, repairing or replacing faulty wiring, or reprogramming or replacing the A/C control module.
7. How much does it cost to fix code P0537 on a 2009 Ford Fusion?
Repairs may range from $50 to $300 depending on whether the issue is a simple wiring repair or requires sensor replacement and labor costs.
8. Can a low refrigerant level cause code P0537 on a 2009 Ford Fusion?
No, low refrigerant typically doesn’t trigger this code, but it can cause similar A/C performance issues. The code is specific to the evaporator temperature circuit.
9. Will clearing the P0537 code fix the problem on my 2009 Ford Fusion?
Clearing the code may reset the warning temporarily, but the underlying issue must be addressed to prevent the code from returning.
10. Can a faulty A/C control module cause code P0537 in a 2009 Ford Fusion?
Yes, a malfunctioning A/C control module can cause this code if it fails to process the evaporator temperature sensor’s signal correctly.
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