Guide To P0547 OBD Error Code Solutions

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The definition of the P0547 error code is Exhaust Gas Temperature Sensor Circuit Bank 2 Sensor 1. The P0547 error code means that the powertrain control module is reading a malfunction in the exhaust gas temperature sensor circuit.

The exhaust gas temperature (EGT) sensor is situated in the exhaust stream, and sends input voltage readings to the PCM. When system voltage is outside of factory parameters, it will cause a code to be stored, illuminating the malfunction indicator lamp. The main culprits are the loose, broken, burned or corroded wiring/terminals/connectors. There can be some other causes like internal short in the sensor, a ground short in the sensor, a failed sensor, a severe exhaust leak from the sensor or an aftermarket exhaust system that would decrease the exhaust back pressure.

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

• The connectors or terminals might be loose or corroded
• Failure in the computer
• Broken wires or missing insulation
• Defective sensor
• A catback exhaust system without EGT provisions installed

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3. Powertrain Control Module - Powertrain Control Module is an important car part which should never be neglected. May be there is some fault in it due to which P0547 code may start flashing.
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We care for our customers and that’s why we can totally understand your problem. That’s the reason why we have listed out some major symptoms behind the flashing up of OBD Code P0547. They are mentioned here as follows:

Common Symptoms

• The check engine light can start flashing up on the dashboard

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P0547:

• Restore the EGT sensor
• Make sure to repair or replace any burned, loose, corroded or shorted wiring or connectors

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Do you wish to diagnose P0547 error code easily? Here are some steps which you should follow in order to diagnose this fault code:

• EGT sensors are of the temperature-reactive resistor variety, and are supplied with a low-voltage (usually 5 bolts) power wire and a ground wire
• As exhaust gas temps pick up, the EGT sensor resistance decreases, allowing an increase in the feedback voltage signal the PCM. As the exhaust gas temps decrease, with the engine off and cooling down, circuit resistance increases and feedback voltage to the PCM drops
• Now if the PCM reads these variations in voltage as changes in EGT and uses this information to adjust ignition timing and fuel metering to regulate EGT and protect the catalytic converter. A technician will need an OBD-II scanner/code reader and a digital volt/ohmmeter for diagnosis. An infrared thermometer equipped with a laser pointer can also be helpful
• Inspect all wiring and connectors, and repair/replace any damaged, disconnected, corroded or shorted wiring, connectors and components as needed. Retest the system to see if repairs were successful
• If all wiring, connectors and components (including fuses) seem to be in good working order, connect the scanner/code reader to the diagnostic port. Record any stored codes and freeze frame the data. This information can be useful in diagnosing an intermittent condition
• All the codes should be cleared up and the vehicle should be taken out for a test drive to see if the code returns
• If codes don’t immediately return, there may be an intermittent condition which may have to be allowed to worsen in order to make a proper diagnosis
• Visually inspect the EGT sensor and system circuitry. Closely examine any areas where wiring or connectors are close to hot exhaust parts
• Repair/replace any damaged, burned or corroded wiring or connectors. If none seem to be present, disconnect and remove the EGT sensor
• Using the digital volt/ohm meter, check the EGT sensor resistance. Resistance is usually in the 150 ohm range, but check manufacturer’s specs. Resistance of under 50 ohms is usually cause to replace the sensor
• If resistance seems to be within spec, reconnect the leads of the digital volt/ohmmeter and heat the EGT sensor with a heat gun
• Watch the digital volt/ohm meter screen to see if the resistance level decreases smoothly as the EGT sensor is heated up
• If resistance level stays high while the EGT sensor heats or stays low as it cools, replace the sensor
• If everything has checked out to this point, turn the vehicle’s key to the “on” position and check for a voltage reading and ground signal at the EGT sensor electrical connections. If there is no low-voltage reading on the signal wire, disconnect the PCM connector and use the digital volt/ohmmeter to perform a continuity test on the wire itself
• If the wire checks OK for continuity, the PCM may be faulty. Remember that PCM failure is rare and will require reprogramming if the unit is replaced
• If no ground can be found, locate the source and check for continuity. Repair/replace any open or shorted wiring or connectors if needed

Common Mistakes When Diagnosing The P0547 Code

• Generally, the downstream O2 sensor is mistaken for an EGT sensor, or technicians believe that the EGT sensor is part of the heated O2 sensor
• Another mistake which can be made by technicians is to replace the oxygen sensor