P011B OBD Error Code: Problem & Solutions

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Do you know the reason why P011B code detects? It is all because of an issue with the engine coolant temperature sensor, bad electrical connection with the engine coolant temperature sensor circuit and there can be some faults in the intake air temperature sensor. So, because of these issues, the P011B fault code would trigger.

The OBD P011B can be described as an Engine Coolant Temperature/ Intake Air Temperature Correlation. The overall temperature of the coolant going through the engine is measured with the engine coolant temperature sensor. The main function of the intake air temperature sensor is to measure the temperature of the air which is going into the car engine. The two readings that would determine if sensors are reading properly and correctly are compared by engine control module. If the PCM determines that there is an irrational reading in one of the sensors, then the P011B error code would start triggering.

What causes this problem with the Engine Coolant Temperature/Intake Air Temperature Correlation?

• Defective engine coolant temperature sensor
• Opened or shorted engine coolant temperature sensor harness
• Poor electrical connection with the engine coolant temperature sensor circuit
• There can be some faults in the intake air temperature sensor
• Intake air temperature sensor harness can get opened or shorted
• Bad electrical connection in the intake air temperature sensor circuit

1. Engine Coolant Temperature sensor - OBD Error Code P011B can also be due to faulty ECT sensor. It’s better to get the faulty ECT sensor replaced as soon as possible.
2. Intake Air Temperature sensor - P011B error code also relates to problems with the Intake Air Temperature (IAT) sensor. Find all the Intake Air Temperature (IAT) sensor related parts with us.
3. Engine Parts - Is your timing belt perfectly correct, but still seeing P011B code? Then there is definitely some issue with the Engine Parts.
4. Powertrain Control Module - OBD Code P011B can flash if the Powertrain Control Module is damaged. You must replace it with a brand new one online with us.
5. Engine Control Module - Did your mechanic just found out that there is some fault in the Engine Control Module? Buy top notch Engine Control Module from us at economical prices.
6. Air Fuel Ratio Sensor - A damaged Air Fuel Ratio can cause a lot of issues. It would be nice if you get it replaced on time.
7. Fuel System - A faulty Fuel System can be troublesome. You can always rely on us as we have best auto parts for our customers.
8. Thermostat - P011B code can display due to some damaged Thermostat. So, it is very important to replace the Thermostat with us at equitable prices.

For us our customers are everything, and that’s why we will help you to diagnose P011B code by mentioning some important symptoms below:

Common Symptoms

• There can be some defects in the ECT/IAT sensor
• The ECT/IAT sensor wiring or connector may be opened or shorted
• The overall engine coolant condition may become low
• Poor thermostat
• Some defects in the water pump
• Air pocket in the car engine cooling system
• Some error in the PCM or PCM programming

The engine coolant temperature sensor should be replaced to correct this issue

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If you want to diagnose the code P011B, then there are some diagnostic tools which you may need. You may require are a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a reliable vehicle information source.

Your diagnosis for any ECT sensor related code should begin by making sure that the engine cooling system is filled to the proper level with the right amount of coolant and operating the engine to ensure that the thermostat, water pump, radiator, and cooling fans are all in good working condition

Make sure that there are no air pockets present in the cooling system. Another thing to be kept in mind is that all facets of the engine cooling system must be working properly before the diagnosis of this code begins. Now when the cooling system is operating normally, you must visually inspect all ECT/IAT system wiring and connectors and make the repairs as per the requirement.

Then the scanner should be connected to the vehicle diagnostic port and all the stored codes should be retrieved as well as freeze frame data. Freeze frame data could be described as a snapshot of the exact circumstances which were occurring at the time of the failure that led to the stored error code P011B. You must write this information somewhere as it would be extremely helpful during the time of diagnosis. You can always clear the codes and test-drive the vehicle to see if the code is reset.

You can use a DVOM to test the individual ECT/IAT sensors and reset the code before the PCM enters readiness mode. Replace the ECT/IAT sensors that fail to comply with the manufacturer’s specifications. You can always consult your vehicle information source for component testing specifications.

All the individual system circuits should be tested using the DVOM if all ECT/IAT sensors comply with manufacturer’s specifications. Now if all the ECT/IAT sensors and circuits are within specifications, then the next step is to suspect the powertrain control module to check if there is some failure or error in the programming.

Here are some additional diagnostic notes:

• The IAT sensor is often left unplugged after the car air filter has been replaced or other related maintenance
• Make sure that you carefully unplug all related controllers from the circuit before you start testing resistance with the DVOM
• Use caution when testing high pressure engine coolant
• If you need some help, then you can always check technical service bulletins with your diagnosis

Common Mistakes When Diagnosing the P011B Code

• There can be some failure in the engine coolant temperature sensor
• Failure in the Intake Air Temperature sensor
• Defects in the powertrain control module or the PCM
• Some issues in the wiring

P011A - Engine Coolant Temperature Sensor 1/2 Correlation