P0538 2011 Ford Fusion Code - A/C Evaporator Temperature Circuit High 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
- P0538 2011 Ford Fusion indicates A/C Evaporator Temperature Circuit High 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.
Code P0538 2011 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 A/C Evaporator Temperature sensor signal input is greater than Self-Test minimum. Self-Test maximum is 4.5 volts.
What are the Possible Causes of the DTC P0538 2011 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 P0538 2011 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 P0538 2011 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.
Need more information about the P0538 2011 Ford Fusion code?
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Need Help with the Code?
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Frequently Asked Questions about P0538 2011 Ford Fusion Code
1. What are common symptoms of OBDII code P0538 (A/C Evaporator Temperature Circuit High Input) in a 2011 Ford Fusion?
The common symptoms include the A/C system not cooling properly, the A/C compressor not engaging, and the A/C system blowing warm air.
2. What are possible causes of OBDII code P0538 in a 2011 Ford Fusion?
Possible causes include a faulty A/C evaporator temperature sensor, a wiring issue in the A/C system, or a malfunctioning HVAC control module.
3. How can I diagnose the A/C evaporator temperature sensor in a 2011 Ford Fusion for OBDII code P0538?
You can diagnose the sensor by using a multimeter to test its resistance and compare the readings to the manufacturer's specifications. If the readings are outside the acceptable range, the sensor may need to be replaced.
4. How can I repair OBDII code P0538 in a 2011 Ford Fusion?
To repair the code, you may need to replace the faulty A/C evaporator temperature sensor, repair any damaged wiring in the A/C system, or replace the HVAC control module if necessary.
5. Can a DIY enthusiast fix OBDII code P0538 in a 2011 Ford Fusion?
While some aspects of diagnosing and repairing this code can be done by a DIY enthusiast, it is recommended to consult a professional technician for accurate diagnosis and proper repair to ensure the A/C system functions correctly.
6. What are the dangers of ignoring OBDII code P0538 in a 2011 Ford Fusion?
Ignoring this code can lead to continued poor performance of the A/C system, potential damage to other A/C components, and discomfort for passengers due to inadequate cooling.
7. Is it safe to drive a 2011 Ford Fusion with OBDII code P0538 (A/C Evaporator Temperature Circuit High Input)?
It is generally safe to drive the vehicle with this code, but it is advisable to have the A/C system inspected and repaired as soon as possible to avoid further issues.
8. How long does it typically take to repair OBDII code P0538 in a 2011 Ford Fusion?
The repair time can vary depending on the exact cause of the code and the availability of parts. In general, it may take a few hours to a day for a professional technician to diagnose and repair the issue.
9. Can weather conditions affect the triggering of OBDII code P0538 in a 2011 Ford Fusion?
Extreme weather conditions, such as very high temperatures, can potentially contribute to the triggering of this code if the A/C system is under additional stress. Regular maintenance and timely repairs can help prevent such occurrences.
10. Will resetting the OBDII code P0538 in a 2011 Ford Fusion make it go away permanently?
Resetting the code may temporarily turn off the check engine light, but if the underlying issue causing the code is not addressed, it is likely to reappear. It is crucial to diagnose and repair the root cause of the problem to prevent recurrence.
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