Error Code P00AC: What It Means & What To Do?

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The immediate signs of problem indicating OBD Error Code P00AC can the Check Engine Light On, increase in the fuel consumption, smoke from the tailpipe and increased heat level indications.

OBD-II Code Decreased engine performance is defined as an Intake Air Temperature Sensor 1 Circuit Low

The IAT (intake air temperature) sensor is used to measures the temperature of air that enters the engine. This temperature is important as the higher the intake air, the higher the combustion temperatures. Higher temperatures result in increased NOx (Nitrogen oxides) emissions.

To control the increased combustion temps, the intake air tubing should be intact. The IAT sensor measures air temp by using a thermistor which is supplied 5 volts reference voltage from the PCM (powertrain control module) and a ground. The change in resistance changes the 5 V reference from the PCM, thereby informing the PCM of the temperature of incoming air.

What causes the problem with the IAT Sensor Circuit?

• Lack of reference voltage to IAT sensor due to open wiring.
• Increased high intake air temperatures
• Signal circuit is short to ground
• IAT connector are damaged
• Faulty PCM that requires replacement or reprogramming

1. Air Temperature Sensor - The Air Temperature sensor if faulty will wrongly measure the air temperatures entering the engine, thus affecting the combustion process. Thus, replacement of faulty sensor is in order.
2. Air Intake Kits - It is very important to maintain the proper air to fuel ratio and enable proper functioning of the engine and thus no one can afford a faulty air intake system. Buy quality air intake kits from us today.
3. MAF Sensor - Mass Air Flow Sensors are an important component to the combustion process and hampers the power output in faulty. Replace them now!. 
4. Engine Control Module - OBD Error Code P00AC can also be due to faulty ECMs which can store wrong error code due to electrical problems. Better to get the faulty electricals replaced as soon as possible.
5. Powertrain Control Module - Faulty powertrain can make car go into failsafe mode, diminishing the vehicle’s overall performance. Find all the Powertrain related parts with us.
6. Diagnostic Tool - In order to detect the error, one needs high grade diagnostic tools. Buy quality scanning and diagnostic tools for us today.

No noticeable symptoms of a P00AC code can be detected other than an MIL (Malfunction Indicator Lamp). However, an emissions test can be done and it may reveal higher NOx readings depending on the type of IAT failure. The engine may also stall under load, depending on the level of sensor or circuit failure

There are some direct indications to the problem for P00AC error. These auto parts can be replaced first hand to solve the problem and check if the error reappears.

• Replacement of the Intake Air Temperature Sensor and circuit board
• Replacement or reprogramming of the of the PCM
• Changing the damaged and worn out wirings and harness

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The step by step analysis and diagnosis is recommended by a qualified technician using high grade diagnostic tools to check for all the problems and solving them.

• You require a scanner or a code reader and a digital volt ohmmeter to successfully diagnose this code. Begin your diagnosis by visually inspecting all wiring and connectors to the sensor.
• Search for shorted or burned wiring and replace them.
• Connect the scanner to the diagnostic connector and record all stored trouble codes and freeze frame data. After the codes are cleared, operate the vehicle to see if the code returns. If the code fails to immediately return, you may have an intermittent condition.
• Check for the problem with the IAT sensor and circuits and diagnose to see with the error returns.
• If everything else is fine, then the problem can be with the PCM. Replace the PCM if required and check if the code reappears.

Common Mistakes When Diagnosing OBD Code P00AC

Some of the common mistakes done while changing diagnosing the OBD code P00AC are:

• Not examining the IAT sensor failure
• Changing the Powertrain Control Module (PCM) without checking other problems
• Not checking for damaged or short wiring and connectors