P1425 GMC 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 GMC 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 GMC 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 GMC?
- 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 GMC?
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 GMC 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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Information for Specific GMC Models
- P1425 2014 GMC Sierra — Intake Air Flow Valve Control Motor High Temperature
- P1425 2015 GMC Sierra — Intake Air Flow Valve Control Motor High Temperature
- P1425 2016 GMC Sierra — Intake Air Flow Valve Control Motor High Temperature
- P1425 2017 GMC Sierra — Intake Air Flow Valve Control Motor High Temperature
- P1425 2018 GMC Sierra — Intake Air Flow Valve Control Motor High Temperature
Frequently Asked Questions about P1425 GMC Code
1. What are common symptoms of OBDII code P1425 GMC (Intake Air Flow Valve Control Motor High Temperature)?
The common symptoms include reduced engine performance, rough idling, and possibly the illumination of the Check Engine Light.
2. What are the potential causes of OBDII code P1425 GMC?
Potential causes of this code may include a faulty intake air flow valve control motor, a wiring issue in the intake air flow valve control circuit, or a problem with the intake air flow valve itself.
3. How can I diagnose the cause of OBDII code P1425 GMC?
Diagnosing this code typically involves using a scan tool to retrieve the code, inspecting the intake air flow valve control motor and related wiring, and testing the functionality of the intake air flow valve.
4. Can I continue driving with OBDII code P1425 GMC present?
It is not recommended to continue driving with this code present, as it can lead to further damage to the engine and other components. It is best to address the issue promptly.
5. How can I repair OBDII code P1425 GMC?
Repairing this code may involve replacing the intake air flow valve control motor, repairing any damaged wiring, or replacing the intake air flow valve itself. It is recommended to consult a professional mechanic for proper diagnosis and repair.
6. Are there any DIY tips for addressing OBDII code P1425 GMC?
DIY tips for addressing this code include checking the intake air flow valve control motor connectors for loose or damaged wires, ensuring proper electrical connections, and inspecting the intake air flow valve for any obstructions.
7. Is OBDII code P1425 GMC a serious issue?
While not an immediate emergency, OBDII code P1425 GMC should be addressed promptly to prevent further engine damage and to maintain optimal vehicle performance.
8. Can a dirty air filter cause OBDII code P1425 GMC?
A dirty air filter is unlikely to directly cause this specific code, but a clogged air filter can affect overall engine performance and efficiency, potentially leading to related issues.
9. How long does it typically take to repair OBDII code P1425 GMC?
The repair time for this code can vary depending on the specific cause and the complexity of the repair. It may take anywhere from an hour to a few hours to properly diagnose and fix the issue.
10. Is it necessary to reset the OBDII system after repairing OBDII code P1425 GMC?
It is recommended to reset the OBDII system after repairing this code to clear the fault code and ensure that the issue has been successfully addressed.
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