P1437 2009 Ford Fusion Code - A/C Evaporator Air Temperature Circuit High
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
- P1437 2009 Ford Fusion indicates A/C Evaporator Air Temperature Circuit High.
- 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 P1437 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 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 P1437 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 P1437 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 P1437 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 P1437 2009 Ford Fusion Code
1. What does the OBDII code P1437 mean on a 2009 Ford Fusion?
P1437 indicates a problem with the A/C evaporator air temperature sensor circuit, specifically that the circuit is reading a high voltage signal.
2. What are the common symptoms of code P1437 in a 2009 Ford Fusion?
The symptoms may include poor A/C performance, inconsistent cabin temperature, or the A/C system not cooling properly.
3. What causes the P1437 code to appear on a 2009 Ford Fusion?
Common causes include a faulty A/C evaporator temperature sensor, damaged or corroded wiring, a loose electrical connection, or a malfunctioning HVAC control module.
4. Can I still drive my 2009 Ford Fusion with the P1437 code?
Yes, you can drive with this code, but the A/C system may not function optimally, leading to discomfort in hot or humid weather.
5. How do I diagnose the P1437 code on a 2009 Ford Fusion?
Start by inspecting the A/C evaporator temperature sensor, wiring, and connectors for damage or corrosion. Use a multimeter to test the sensor and verify circuit continuity.
6. How do I fix the P1437 code on a 2009 Ford Fusion?
Repairs may involve replacing the A/C evaporator temperature sensor, repairing damaged wiring, or addressing connection issues. In rare cases, the HVAC control module may need to be replaced.
7. How much does it cost to fix the P1437 code on a 2009 Ford Fusion?
The cost varies depending on the repair, but replacing the A/C evaporator temperature sensor typically costs between $100 and $300, including parts and labor.
8. Can a faulty A/C evaporator temperature sensor trigger the P1437 code?
Yes, a defective A/C evaporator temperature sensor is a common cause of the P1437 code.
9. Will clearing the P1437 code fix the problem on my 2009 Ford Fusion?
Clearing the code will remove it temporarily, but if the underlying issue isn’t resolved, the code will return.
10. Could a failing HVAC control module cause the P1437 code?
Yes, while less common, a malfunctioning HVAC control module can cause issues with the A/C evaporator air temperature circuit and trigger the P1437 code.
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