P0537 Lincoln 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 Lincoln 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.
Code P0537 Lincoln 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 Lincoln?
- 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 Lincoln?
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 Lincoln 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 Lincoln Code
1. What does the OBDII code P0537 mean on a Lincoln?
The P0537 code indicates a low input signal from the A/C evaporator temperature sensor circuit, which monitors the evaporator's temperature for proper air conditioning performance.
2. What are the common symptoms of the P0537 code?
Symptoms may include reduced A/C performance, warm air blowing from the vents, inconsistent cabin temperatures, or the A/C system failing to turn on.
3. What causes the P0537 code to trigger?
The code can be caused by a faulty A/C evaporator temperature sensor, damaged wiring or connectors, a short circuit, or issues with the vehicle’s PCM (Powertrain Control Module).
4. Can I still drive my Lincoln with the P0537 code?
Yes, but driving with this code may result in reduced A/C efficiency, especially during hot weather. It’s best to address the issue to restore optimal cabin comfort.
5. How can I diagnose the P0537 code?
Start by checking the A/C evaporator temperature sensor and its wiring for damage or corrosion. Use a multimeter to test the sensor’s resistance and ensure proper voltage at the connector.
6. How do I fix the P0537 code on my Lincoln?
Repairs may involve replacing the A/C evaporator temperature sensor, repairing damaged wiring or connectors, or in rare cases, reprogramming or replacing the PCM.
7. How much does it cost to fix the P0537 code?
The repair cost depends on the issue but typically ranges from $100 to $300, including labor and parts, for replacing the sensor or fixing wiring.
8. Can a low refrigerant level cause the P0537 code?
No, low refrigerant levels do not directly cause the P0537 code, but they can affect overall A/C performance. The code specifically relates to the evaporator temperature sensor circuit.
9. Will clearing the P0537 code fix the problem?
Clearing the code may temporarily erase it, but if the underlying issue isn’t resolved, the code will likely return.
10. Does the P0537 code affect other systems in my Lincoln?
This code generally only impacts the A/C system and does not affect engine performance or other vehicle systems.
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