P1425 2014 GMC Sierra Code - Intake Air Flow Valve Control Motor High Temperature
Quick Answer
The intake airflow valve of diesel engines reduces the intake air flow rate in part-load operation so that a higher exhaust gas recirculation rate can be achieved. Common causes include Faulty Throttle Body Assembly, Throttle Body Assembly harness is open or shorted, Throttle Body Assembly circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1425 2014 GMC Sierra indicates Intake Air Flow Valve Control Motor High Temperature.
- Common causes
- Common causes include Faulty Throttle Body Assembly, Throttle Body Assembly harness is open or shorted, Throttle Body Assembly circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1425 2014 GMC Sierra Description
The Intake airflow valve assembly contains a contactless inductive throttle position sensing element that is managed by a customized integrated circuit. The valve position sensor is mounted within the valve body assembly and is not serviceable. The Engine Control Module (ECM) supplies the valve body with a 5 V reference circuit, a low reference circuit, an H-bridge motor directional control circuit, and an asynchronous signal/serial data circuit. The asynchronous signal means communication is only going from the intake airflow valve to the ECM. The Intake Air Flow Valve cannot receive data from the ECM over the signal/serial data circuit. The valve position sensor provides a signal voltage that changes relative to the valve blade angle. The valve position sensor information is transmitted between the Intake Air Flow Valve and the ECM on the signal/serial data circuit.
The valve may also be used to shut down the engine by closing the intake airflow valve and disabling the fuel injectors if the control module detects the engine speed is beyond the desired control limits. The Diagnostic Trouble Code (DTC) will be set if the ECM detects that the intake airflow valve control circuit internal temperature is greater than a calibrated threshold.
What are the Possible Causes of the DTC P1425 2014 GMC Sierra?
- Faulty Throttle Body Assembly
- Throttle Body Assembly harness is open or shorted
- Throttle Body Assembly circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P1425 2014 GMC Sierra?
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 P1425 2014 GMC Sierra 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 P1425 2014 GMC Sierra Code
1. What does the OBDII code P1425 mean on a 2014 GMC Sierra?
The P1425 code refers to "Intake Air Flow Valve Control Motor High Temperature," indicating the control motor for the intake airflow valve has detected an abnormally high temperature.
2. What are the common symptoms of code P1425 on a GMC Sierra?
Symptoms may include reduced engine performance, poor acceleration, decreased fuel efficiency, and an illuminated check engine light.
3. What causes the P1425 code to appear?
Common causes include a faulty intake air flow valve control motor, wiring issues such as damaged or shorted circuits, or excessive heat buildup in the motor itself.
4. Can I drive my 2014 GMC Sierra with the P1425 code?
While it may be possible to drive the vehicle, it is not recommended as it could lead to reduced engine performance and potentially cause further damage if not addressed.
5. How do I fix the P1425 code on my GMC Sierra?
Repairs typically include inspecting and replacing the intake air flow valve control motor, repairing damaged wiring or connectors, or addressing any overheating issues in the engine bay.
6. How is the P1425 code diagnosed?
A technician will use an OBDII scanner to confirm the code, inspect the intake air flow valve and its motor, check for wiring issues, and test the motor's functionality and temperature readings.
7. What tools are needed to repair the P1425 code?
Basic tools may include an OBDII scanner, multimeter for electrical testing, and standard hand tools for replacing the intake air flow valve or its components.
8. Is the P1425 code a common issue on the 2014 GMC Sierra?
It’s not a highly common issue but can occur due to wear and tear on the intake air flow valve control motor or related components over time.
9. How much does it cost to fix the P1425 code?
Repair costs vary but typically range from $100 to $300, depending on whether the motor needs replacement or if wiring repairs are required.
10. Can a dirty air filter cause the P1425 code?
While a dirty air filter alone may not trigger this code, it can contribute to airflow issues that stress the intake airflow system, potentially exacerbating the problem.
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