P1425 2015 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 2015 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 2015 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 2015 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 2015 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 2015 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 2015 GMC Sierra Code
What does the OBDII code P1425 mean on a 2015 GMC Sierra?
P1425 indicates that the Intake Air Flow Valve Control Motor has detected a high temperature condition, which may affect the operation of the air intake system.
What are the common symptoms of code P1425 on a 2015 GMC Sierra?
Symptoms include reduced engine performance, rough idling, poor fuel efficiency, and possibly the illumination of the check engine light.
What causes the P1425 code to appear on a 2015 GMC Sierra?
Common causes include a malfunctioning intake air flow valve control motor, electrical issues such as damaged wiring or connectors, or excessive heat affecting the motor.
Can I drive my 2015 GMC Sierra with the P1425 code?
Driving with this code is not recommended, as it may lead to reduced engine performance and potential damage to other components if the issue is not addressed.
How do I diagnose the P1425 code on a 2015 GMC Sierra?
Diagnosis involves checking the intake air flow valve control motor for damage, inspecting the wiring and connectors for shorts or corrosion, and using a scan tool to monitor the system.
What tools are needed to fix the P1425 code on a 2015 GMC Sierra?
You may need a multimeter, a scan tool, basic hand tools, and possibly a replacement intake air flow valve control motor.
How much does it cost to repair the P1425 code on a 2015 GMC Sierra?
Repair costs vary, but replacing the intake air flow valve control motor typically ranges from $200 to $500, including parts and labor.
Can the P1425 code be caused by a bad sensor?
While this code is specifically related to the intake air flow valve control motor, a faulty sensor in the air intake system could indirectly contribute to the issue.
How can I prevent the P1425 code from occurring on my 2015 GMC Sierra?
Regular maintenance, including inspecting and cleaning the air intake system and ensuring proper electrical connections, can help prevent this code.
Is the P1425 code related to any other codes on a 2015 GMC Sierra?
Yes, it may be accompanied by other codes related to the air intake system or motor control circuitry, which can provide additional clues for diagnosis.
Discuss the causes and fixes for P1425 2015 GMC Sierra OBDII Code
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