P1425 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 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 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?
- 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?
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 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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Need Help with the Code?
Get the P1425 code diagnosed by a professional: Find a repair shop in your area
Information for Specific Makes
- P1425 Audi — Tank Ventilation Valve Short To Ground
- P1425 Buick — Intake Air Flow Valve Control Motor High Temperature
- P1425 Cadillac — Intake Air Flow Valve Control Motor High Temperature
- P1425 Chevrolet — Intake Air Flow Valve Control Motor High Temperature
- P1425 GMC — Intake Air Flow Valve Control Motor High Temperature
- P1425 Suzuki — EVAP System Leak Detect Pump Flow High/Low
- P1425 Volkswagen — Tank Ventilation Valve Short To Ground
Frequently Asked Questions about P1425 Code
1. What are the common symptoms of OBDII code P1425 (Intake Air Flow Valve Control Motor High Temperature)?
- Common symptoms include poor engine performance, reduced fuel efficiency, and the illumination of the Check Engine Light.
2. What can cause the OBDII code P1425 to trigger?
- The code may be triggered by a faulty intake air flow valve control motor, a problem with the intake air flow valve, or issues with the wiring or connectors in the intake air flow system.
3. How serious is the OBDII code P1425?
- While the code may not cause immediate harm to the vehicle, it can lead to decreased engine efficiency and performance if left unresolved.
4. Can I continue driving my vehicle with the OBDII code P1425 present?
- It is generally not recommended to continue driving with this code present, as it can negatively impact engine performance and fuel efficiency.
5. How can I diagnose the cause of OBDII code P1425?
- Diagnosing the issue typically involves using a scan tool to retrieve the code, inspecting the intake air flow valve control motor and related components, and testing the wiring and connectors for faults.
6. What are some repair tips for fixing OBDII code P1425?
- Repair tips may include replacing the intake air flow valve control motor, checking and cleaning the intake air flow valve, and repairing any damaged wiring or connectors in the system.
7. Can I reset the Check Engine Light after fixing OBDII code P1425?
- After fixing the underlying issue causing the code, you can reset the Check Engine Light using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes.
8. How much does it typically cost to repair OBDII code P1425?
- The cost of repairs can vary depending on the cause of the code, but it may involve parts and labor expenses ranging from $100 to $500 or more.
9. Is it possible to prevent OBDII code P1425 from occurring in the future?
- Regular maintenance of the intake air flow system, including cleaning and inspecting components, can help prevent issues that may trigger this code.
10. Can a DIY enthusiast fix OBDII code P1425 at home?
- Depending on their skill level and access to tools, a DIY enthusiast may be able to diagnose and repair this code at home, but professional assistance is recommended for more complex issues.
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