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Error Code P00A4: What It Means & What To Do?

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

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A sudden drop in the fuel efficiency and the engine performance may be an indication of problem with the transmission and fuel systems, thus indicating OBD Code P00A4 Error. OBD-II Code Powertrain Control Module (PCM) failure is defined as a Charge Air Cooler Temperature Sensor Circuit Intermittent/Erratic.

Learn More About OBD Error Code P00A4

The Intake Air Temperature Sensor measures the air temperature going into the engine and the engine control module (PCM) uses this information to determine how much fuel to air ratio to maintain for the engine to run properly. When the PCM detects a problem with this sensor or the circuit for the sensor, it will set code P00A4.

 

The IAT (Intake Air Temperature) sensor is used to read the amount of air entering the engine through the intake pipe/intake manifold and the PCM adjusts how much fuel to enter the combustion chamber for a perfect air/fuel ratio. When the PCM (Powertrain Control Module) detects there is a problem with IAT (intake air temperature) sensor 1 on the vehicle a trouble code will set. This code is set for the bank 2 side of the engine.

 

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


  • Intake Air Temperature Sensor faulty
  • Damaged wiring/ connections to the IAT (Intake Air Temperature) Sensor circuit
  • Faulty PCM (Powertrain Control Module) taking wrong reading from the IAT
  • Leakage/ Clogged intake/inlet pipe
  • MAF (Mass Airflow Sensor) faulty or damaged

Replace/Repair These Parts To Fix OBD Code P00A4

  1. Turbocharger - Damaged turbocharger is not able to push extra air into the engine which directly hampers the performance. Replace your damaged turbochargers with us!
  2. Supercharger - Faulty supercharger hampers the density of air entering the engine which affects the power output. Replace damaged supercharger and parts today!
  3. Air Temperature Sensor - Faulty Air Temperature sensor affects the combustion process of the engine and thus the performance. Replace faulty sensor now!
  4. Engine Control Module - Faulty ECMs may lead to engine stalling or not starting, and check engine lights being on. Replace faulty ECM components with us.
  5. Intercoolers - An intercooler is an intake air cooling device commonly used on turbocharged and supercharged engines and varies the temperature of air entering the engine. Visit us to buy quality intercooler today!
  6. Powertrain Control Module - P00A4 error can also relate to fault in the PCM and other electrical components. Buy all the Powertrain related parts with us.
  7. Diagnostic Tool - Visit us today to grab amazing deals on quality diagnostic tools to detect and correct the OBD error codes.

Symptoms Of OBD Error Code P00A4

This fault may cause reduced power, the engine may run rough, or the engine may crank but not start. There is typically an illuminated Check Engine light as well. At Parts Avatar Canada find genuine replacement parts and performance parts for your vehicle. This error may also indicate problems that will likely affect:

 

Common Symptoms

 

  • Check Engine Light will illuminate indicating error P00A4 code by the PCM
  • Engine lacks power and reduces performance and acceleration
  • Increased fuel consumption due to problem in fuel delivery system
  • Unusual throttle response and stalling

How To Correct P00A4 Charge Air Cooler Temperature Sensor Circuit Intermittent/Erratic Bank 2

Some of the common fixes for the problems in the OBD Code P00A4 for all makes and models are as follows;

 

  • IAT (Intake Air Temperature) Sensor replacement as might be taking wrong readings
  • Repair or replace damaged wiring/connections to the IAT (Intake Air Temperature) Sensor
  • Replace faulty PCM that is unable to read IAT data.
  • Leaky and damaged intake/inlet pipe should be replaced
  • Replacing faulty MAF (Mass Airflow Sensor)

Easy Diagnosis Of Engine Error OBD Code P00A4

A qualified technician who has the knowledge of industrial grade diagnostic tools should be recommended for the diagnosis Error P00A4. Proper checks of the wirings and connectors as well as sensors, ECM/PCM fuel delivery system, transmission system, etc., should be done. Following are some points to be taken care of during the diagnosis.

 

  • Visual inspection of the charge air cooler temperature sensor and the corresponding wiring should be done to check for any loose connections, damaged wiring, etc.
  • Also check the charge air cooler and ducting for any damaged and do the repairs accordingly. Later check if the code reappears.
  • 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 P00A4

 

  • Some of the common mistakes done while changing diagnosing the OBD code P00A4 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 P00A4

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

P00A3 - Charge Air Cooler Temperature Sensor Circuit High Bank 2