P00AF - OBD Trouble Code

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If you experience exponential drop in the fuel economy, and your car engine is stalling with improper throttle response and Check Engine Light turned on. It might be an indicative to OBD Code P00AF error.

OBD-II Code Powertrain Control Module (PCM) failure is defined as a Turbocharger/Supercharger Boost Control "A" Module

The engine control module (PCM) uses a Boost Control Solenoid to control the turbocharger and provide the requested amount of boost. When the PCM detects an incorrect signal from the Boost Control Solenoid, it will set code P00AF.

What causes the problem with the Turbocharger/Supercharger Boost Control?

• Burnt, damaged, shorted, disconnected, or corroded wiring and/or connectors
• Vacuum leaks caused by damaged, split, dislodged, hardened, or perforated vacuum lines
• Insufficient vacuum due to a defective vacuum pump
• Defective vacuum actuator
• Defective vacuum control solenoid
• Defective stepper motor
• Mechanical defects of the variable vanes
• Mechanical failure of the turbocharger itself
• Defective, or malfunctioning boost pressure or turbine speed sensor
• Clogged catalytic converter

1. Turbocharger - Since a turbocharger forces extra air into the combustion chamber, it is important for the combustion process and engine performance. Replace damaged turbochargers with immediately.
2. Supercharger - A damaged supercharger is not able to increase the air pressure or density of air supplied to an internal combustion engine. Replace damaged supercharger and parts now!
3. Air Temperature Sensor - The Air Temperature sensor plays an important step in combustion, thus the engine performance. Replace faulty sensor now!
4. Engine Control Module - Faulty ECMs can also be the reason for stored OBD error code. It’s better to get the faulty electricals replaced immediately.
5. Powertrain Control Module - P00AF error code also relates to problems with the PCM and thus storing and flashing of wrong OBD error codes. Find all the Powertrain related parts with us.
6. Auto Switches & Sensors - Common causes behind that P00AF error code can be defective switches or faulty sensors. So, it will be a good decision to replace them first, if found damaged or faulty.
7. Boost Pressure Gauge - An OBD code can also be mistaken by faulty gauge readings. Replace the faulty one now!
8. Intake Manifolds - Replace damaged or old air intake manifolds as it adversely affects the engine’s performance. Visit us today!
9. Diagnostic Tool - In order to detect the error, one needs high grade diagnostic tools. Visit us today to grab amazing deals.

Typical symptoms of code P00AF are much the same across all applications, although the severity of one or more symptoms may vary between applications. Below are some typical symptoms associated with this code-

• Excessive turbo lag
• Excessive oil consumption
• Loss of power that can vary from slight to severe
• White smoke from the tailpipe may be present
• Mechanical, or whistling noises may be present at some engine speeds
• In some cases, the turbocharger may suffer severe, to fatal mechanical damage

Proper scan tools should be used to detect and diagnose the problems related to a particular OBD error code. After testing it is important to check that the error doesn’t reflect back anymore. Some of the common components that account to the major problems of the P00AF error code and when fixed can fix the problem are:

• Replacement Turbocharger/Supercharger – This component keeps the check on air entering the engine and coordinated with the ECM specifying the air’s temperature before it enters the engine.
• Bad wiring to the turbocharger, catalytic converter, and intercoolers can be the first reason for the sensor’s fault and for the Error P00AF to flash.
• PCM (Powertrain Control Module) – If all the other tests of the sensor and circuit come out to be perfect, then the PCM should be checked for faults and replaced if necessary.

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P00AF is properly diagnosed with an advanced scan tool capable of factory sensor readings (not just one from an auto parts store). A qualified technician can read the data from the advanced scan tool to determine when the problem occurred, or if it is still occurring. They may clear the code/light and test drive the vehicle while monitoring the scan tool data to see if the fault returns or is present.

Based upon the conditions of the test, possibly clearing the code, and road testing the car while monitoring the data, further diagnosis may be required. Diagnosis may require multiple steps such as:

• Record all fault codes present, as well as all available freeze frame data. This information can be of use should an intermittent fault be diagnosed later on.
• Knowing how variable boost control systems work makes diagnosing faults in the system considerably easier, so spend an hour or so reading the relevant section(s) in the repair manual, and be sure to use the manual to locate all the parts and components that make up the system. Do not proceed to Step 3 unless you have a full understanding of how the system works, where all the components that make up the system are located, and how these components interact to make the system work as intended.
• The variable boost control system will either be vacuum -, or electrically operated, so once you have identified the various components
• If the stepper motor does not rotate freely, or does not rotate at all, consult the manual to determine the correct procedure to test the resistance, and continuity of the motor, as well as all associated wiring, sensors, and connectors. Be sure however to disconnect the boost control system from the PCM and other relevant controllers during this step to prevent damage to the controller(s).
• If the variable boost control system is vacuum controlled, locate all associated vacuum hoses, actuators, and control solenoids. Inspect all vacuum hoses for visible damage such as splitting, cracking, hardening, or perforations, and replace all hoses and lines as required.
• If no damage to vacuum lines is found, locate the vacuum actuator that controls the variable vanes, and connect the vacuum pump to it where the vacuum system normally attaches to the actuator. 

Common Mistakes When Diagnosing OBD Code P00AF

Always take assistance of a qualified technician to know the problem to this error. Never lose sight of the symptoms and never be in hurry to come to a conclusion as sometimes very small issue can lead to flashing of the OBD errors. Some of the major mistakes related to code P00AF are mentioned below.

• Replacement of the Turbochargers without checking the associated wirings and terminals
• Powertrain Control Module (PCM) replacement without inspecting the sensors and data transmission units
• Worn out and damaged wiring and connectors not checked and replaced