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P00A3 - OBD Trouble Code

OBD Code P00A3 - Charge Air Cooler Temperature Sensor Circuit High Bank 2

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Is your Check Engine Light illuminated on the car’s dashboard? Are you experiencing sudden drop in the fuel economy with stalling of the engine? Or is there any smoke coming from the exhaust pipe? Then, there might be a possibility of an issue with the Air Cooler Temperature Sensor of the car thus indicating OBD Code P00A3 error.

Learn More About OBD Error Code P00A3

The Charge Air Cooler Temperature Sensors informs the engine PCM about the temperature of the air going into an out of the charge air cooler assembly. The function of the Charge Air Cooler Assembly is to cool the air coming out of the turbocharger before the air goes into the engine. If the PCM detects an incorrect signal from the sensor, it will set code P00A3.

 

A Charge Air Cooler also known as an Intercooler is found on turbocharged/supercharged vehicles. The compressed hot air by the turbocharger/supercharger enters the Charge Air Cooler where it cools down before entering the engine. Without the Intercooler, the air entering the engine would be hot causing the engine to run very inefficiently and possibly causing engine knock.

 

What causes the problem with the Charge Air Cooler Temperature Sensor Circuit?

 

  • Faulty Air Cooler Temperature Sensor
  • Faulty or damaged wiring to the sensor or circuits
  • Improper functioning of the Intercooler
  • Faulty PCM exhibiting wrong code

Replace/Repair These Parts To Fix OBD Code P00A3

  1. Engine Control Module - OBD Error Code P00A3 can also be due to faulty ECMs. It’s better to get the faulty electricals replaced as soon as possible.
  2. Intercoolers - Damaged intercooler leads to wrong temperature air entering the engine thus reducing the performance. Visit us to buy quality intercooler today!
  3. Turbocharger - A turbocharger can increase the power output by forcing extra air into the combustion chamber. Replace your old/faulty turbochargers with us!
  4. Supercharger - Damaged/faulty supercharger reduces the combustion inthe engine thus reducing the power. Replace damaged supercharger and parts today!
  5. Air Temperature Sensor - The damaged Air Temperature sensor can read the air entering the engine wrongly, thus hampering the performance. Replace faulty sensor now!
  6. Powertrain Control Module - Faulty PCM can easily distorted engine timing causing frequent halting. Find all the Powertrain related parts with us.
  7. Diagnostic Tool - In order to detect the error, one needs high grade diagnostic tools. Visit us today to grab amazing deals.

Symptoms Of OBD Error Code P00A3

Error code P00A3 can flash due to many reasons, be it damaged wirings, faulty temperature sensors, intercoolers or the ECM itself hampering the engines performance by not being able to control the temperature of the air entering the engine.

 

Common Symptoms

 

  • Check engine light illuminated
  • Reduced engine performance
  • Increased in fuel consumption
  • Vehicle stuck in "limp" mode to protect the engine from further damage
  • Diesel particulate filter regeneration inhibited

How To Correct P00A3 Charge Air Cooler Temperature Sensor Circuit High Bank 2

Some of the components that are directly affected and can be examined first to detect the problem and solve it are mentioned below.

  • Replacement CACT (Charge Air Cooler Temperature Sensor) – It is the prime component that keeps the check on the temperature of the air entering and exiting the Intercoolers before finally entering the engine.
  • Bad wiring to the CACT (Charge Air Cooler Temperature Sensor) can be the first reason for the sensor’s fault and fault in the Intercooler by giving wrong temperature readings as well as not functioning properly to reduce the temperature and for the Error P00A3 to flash by the PCM.
  • PCM (Powertrain Control Module) – If all the other tests deemed out to be perfect, then the PCM should be checked for faults and replaced or reprogrammed if necessary.

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Easy Diagnosis Of Engine Error OBD Code P00A3

Inspect the charge air cooler temperature sensor and the corresponding wiring and look for loose connections, damaged wiring, etc. Also, visually inspect the charge air cooler and ducting. If damage is found, repair as necessary, clear the code and see if it returns.

 

  • Use a scan tool to monitor the charge air coolant temperature sensor data parameter. Disconnecting the CACT sensor should drop the value very low. Connect a jumper wire across the terminals, and if the scanner shows a very high temperature, that means the connections are sound and the ECM can recognize the input.
  • Test the CACT sensor: After disconnecting the charge air cooler temperature sensor connector, resistance between the two sensor terminals is measured. After starting the engine, the values should decrease smoothly as the engine warms up. If engine temperature increases but CACT resistance does not decrease, the sensor is faulty and needs replacement

 

Common Mistakes When Diagnosing OBD Code P00A3

 

  • Some of the common mistakes done while changing diagnosing the OBD code P00A3 are:
  • Improper assessment of the CACT Sensor
  • Simply replacing the Powertrain Control Module (PCM) without considering other possibilities of problem
  • Not noticing the damaged or loosened wiring and circuit problems

Other Diagnostic Codes Related To OBD Code P00A3

P00A0 - Charge Air Cooler Temperature Sensor Circuit Bank 2

P00A1 - Charge Air Cooler Temperature Sensor Circuit Range/Performance Bank 2

P00A2 - Charge Air Cooler Temperature Sensor Circuit Low Bank 2

P00A4 - Charge Air Cooler Temperature Sensor Circuit Intermittent/Erratic Bank 2