P1438 Ford Code - A/C Evaporator Air Temperature Circuit Range/Performance
Quick Answer
The Engine Control Module (ECM) detected the evaporator control circuit had a range/performance condition. Common causes include Faulty A/C Evaporator Air Temperature Sensor, A/C Evaporator Air Temperature Sensor harness is open or shorted, A/C Evaporator Air 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
- P1438 Ford indicates A/C Evaporator Air Temperature Circuit Range/Performance.
- Common causes
- Common causes include Faulty A/C Evaporator Air Temperature Sensor, A/C Evaporator Air Temperature Sensor harness is open or shorted, A/C Evaporator Air 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 P1438 Ford Description
What are the Possible Causes of the DTC P1438 Ford?
- Faulty A/C Evaporator Air Temperature Sensor
- A/C Evaporator Air Temperature Sensor harness is open or shorted
- A/C Evaporator Air Temperature Sensor circuit poor electrical connection
How to Fix the DTC P1438 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 is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1438 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.
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Frequently Asked Questions about P1438 Ford Code
What does the OBDII code P1438 mean on a Ford vehicle?
The P1438 code indicates an issue with the A/C evaporator air temperature circuit, specifically a range or performance problem.
What are the common symptoms of the P1438 code?
Common symptoms include reduced A/C cooling performance, inconsistent cabin temperatures, and an illuminated check engine light.
What causes the P1438 code to trigger?
The code can be caused by a faulty A/C evaporator temperature sensor, damaged wiring or connectors, or issues with the HVAC control module.
Can I still drive my car with the P1438 code active?
Yes, you can drive the car, but the air conditioning may not work properly, leading to discomfort in hot weather.
How do I diagnose the P1438 code?
Diagnose the code by using an OBDII scanner to confirm the fault, visually inspecting the sensor and wiring, and testing the circuit with a multimeter.
How do I fix the P1438 code on a Ford vehicle?
Repairs may involve replacing the A/C evaporator temperature sensor, repairing damaged wiring, or reprogramming the HVAC control module if needed.
What tools are needed to repair the P1438 code?
Tools typically include an OBDII scanner, a multimeter, and basic hand tools for accessing and replacing components.
How much does it cost to repair the P1438 code?
Repair costs vary but can range from $100 to $300, depending on whether you replace the sensor or repair wiring.
Can a dirty evaporator cause the P1438 code?
While not common, a dirty evaporator restricting airflow could contribute to temperature sensor issues, but the primary cause is usually electrical.
Do I need professional help to fix the P1438 code?
If you're comfortable with basic diagnostics and repairs, you can fix it yourself, but complex wiring or module issues may require a professional.
Discuss the causes and fixes for P1438 Ford OBDII Code
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