Guide To P2085 OBD Error Code Solutions

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A decrease in engine performance signifies a P2085 OBD code and it is called as an exhaust gas temperature sensor circuit intermittent bank 1 sensor 2. The engine control module receives information from the EGT sensor about the temperature of the exhaust gas which goes in and out of the selective catalytic reduction. If an unbelievable signal is found by the PCM in the EGT sensor, the P2085 error will be set.

The EGT sensor is monitored continuously by the PCM for correct continuity of the circuit as well as the high values that are out of range. The EGT sensor is found in front of either the diesel oxidation catalyst or the diesel particulate filter. The exhaust gas temperature is found by the EGTS and it changes it into a voltage and gives it back to the PCM with voltage signal so that engine conditions are controlled to effectively minimize the emissions. If the EGTS is out of factory specification, then the P2085 error will be set in the PCM.

What causes this problem with the Exhaust Gas Temperature Sensor Circuit Intermittent Bank 1 Sensor 2?

• The connectors or the terminals might be corroded in most cases.
• There might be a short directly to the ground due to damaged wires or missing insulation.
• Failure of the sensor.
• A catback system might be installed without EGT provisions.
• As a very rare case, it might be possible that the computer has failed.

1. Powertrain Control Module - Conditions of misfire and stalling of the vehicle are the popular symptoms of a faulty PCM. Do you find these symptoms in your vehicle? Then, replace the faulty PCM instantly.
2. Engine Control Module - Does your car jump start on reverse polarity? It is an indication of damaged ECM. Repair / replace it soon to avoid P2085 error.
3. Exhaust Gas Temperature Sensor - Illumination of the check engine light is an indication that the EGT sensor is faulty. Change it as soon as possible.
4. Diesel Particulate Filter - Does your engine fail to start? Does your engine find it very hard to start or accelerate? Then the DPF can be faulty. Change it quickly.
5. Diesel Oxidation Catalyst - Any ash build up around the diesel oxidation catalyst will likely damage it. Clean the DOC or replace it with a new one from PartsAvatar.

If you are facing OBD error code P2085, then there are significant common symptoms that can be felt or observed. We have worked out a list here to help you out in understanding this problem better.

Common Symptoms

• The illumination of the check engine light will take place and the P2085 error will be stored by the computer.
• Connectors will be corroded.
• Corrosion of the EGT.
• You might not find any other symptoms very easily.

It is very important to fix the fault code P2085. So here are some ways with which you can correct this issue:

• In most cases, you have to replace the eroded or defective connectors.
• A short to the ground can be caused due to damaged wires or missing insulation which has to be fixed.
• The faulty sensor must be changed.
• As a very rare case, the damaged computer must be replaced.

However, if you face any issue then we have stocked a wide range of best-priced powertrain control module, EGTS, DOC, DPF, corroded connectors, exhaust gas temperature sensor, pcm module and more to help you out in fixing your car.

If you want to easily diagnose this P2085 fault code, then all you have to do is to follow the steps which are mentioned below:

• The exhaust gas temperature sensor is nothing but a 2-wire sensor which is placed in the exhaust down-pipe.
• Vehicles which use diesel, gasoline and turbocharged engine will likely have this EGT sensor.
• You will find this sensor, near the DPF section of the exhaust system in diesel engines.
• The EGT sensor will be placed in the exhaust input pipe nearby the turbocharger by the turbocharged applications.
• The EGT sensor is a type of temperature reactive resistor.
• A low voltage power wire and ground wire which is of 5 volts are provided to the sensor.
• An increase of the exhaust gas temperature will decrease the resistance level in the sensor which permits the feedback voltage signal to increase to the PCM.
• With the engine turn off, if the exhaust temperature decreases, the resistance of the circuit will increase and the feedback voltage signal to the PCM will decrease.
• The PCM acts accordingly by recognizing these variations of voltage as exhaust gas temperature and it adjusts the air/fuel ratios or ignition timing so that the EGT can be reduced and the catalytic converter can be protected.
• Various tools can be helpful when you try to diagnose this error code.
• A reliable OBD-II scanner (or code reader) and a digital volt/ohmmeter can prove to be highly helpful to carry out this diagnostic procedure.
• An infrared thermometer which has a laser pointer can also be highly helpful.
• Visually check every wires and connector.
• Fix the defective, detached or shorted wires, connectors, and other parts as necessary
• Recheck the system after every repair to make sure the diagnosis is successful.
• If every system appears to be in proper working condition, attach a scanner to the diagnostic connector and recover every freeze frame data and stored codes.
• In order to diagnose the erratic condition, this information can be highly helpful as you can know how this error code was stored.
• Clear the error codes and check again to see if the error appears.
• This can help you to know if there is any erratic signal stored in the vehicle.
• Clear the error codes and check again if they appear so it can help to know if any malfunction occurred.
• If the code does not instantly return, it is because of an irregular condition.
• Try to worsen this situation before proceeding with further diagnosis as it is a risky task.
• Continue the diagnostic process by checking the EGT sensor and system circuits.
• You have to closely look at the areas where the wires and connectors are situated near the hot exhaust components.
• If every circuit of the EGT sensor works properly, then proceed with the diagnostic process.
• Repair or replace the items that are defective, burnt or corroded and reset the system by resetting the code. If you don’t find any burnt, defective, shorted or loose wires or connectors, separate the connector of EGTS and remove the EGT sensor.
• Check the resistance of the EGT sensor with the help of a digital volt/ohmmeter.
• Before you test, double check the manufacturer’s specification, but the resistance for this sensor must be about 150 ohms.
• Replace the sensor, if the resistance is below 50 ohms.
• Heat the resistor with the help of a heat gun, if you find the initial resistance within the specification and let the leads of the DVOM stay connected.
• Resistance level on the sensor must be carefully observed while raising the temperature to see if it glides down smoothly.
• If the resistance level fails to decrease while heating and if it cools while increasing, then change the sensor.
• If everything works well, then turn on the key and check for the presence of voltage and ground signal at the electrical connector of the exhaust gas temperature sensor.
• If you don’t find low voltage on the signal wire that is 5 volts, separate the PCM and carry out a continuity test on the wire with the help of a DVOM.
• The PCM might be faulty if there is continuity and it has to be either replaced or reprogrammed.
• If you don’t find ground, discover the source and check the continuity with a DVOM.
• Open or shorted wires and connectors must be repaired or changed.
• Fixing a high-performance exhaust system which does not have a catalytic convertor can cause this error to get stored due to the absence of exhaust system back pressure.
• This condition can be corrected by fixing an in-line resistor between the signal and ground wire and separating the EGT sensor.
• The resistance of the sensor will be read by the PCM and passed on.
• Before you remove the components related to emission, check the local, state and federal laws.

Common Mistakes When Diagnosing the P2085 Code

• Failure of the exhaust gas temperature sensor.
• Faulty PCM.
• An issue with wires.