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P2034 Exhaust Gas Temperature EGT Sensor Circuit Low Bank 2 Sensor 2

OBD-II Trouble Code Technical Description

Article by
Don Bowman
ASE Certified Automotive Tech

Exhaust Gas Temperature EGT Sensor Circuit Low Bank 2 Sensor 2

What does that mean?

This is a generic powertrain code, which means it covers all makes/models, 1996-newer. However, specific troubleshooting steps will vary depending on the vehicle.

This diagnostic trouble code (DTC) P2034 refers to the condition of the EGT (exhaust gas temperature) sensor located in the "up" pipe forward of the catalytic converter. Its sole purpose in life is to protect the converter from damage due to excessive heat.

Code P2034 denotes a detected general malfunction within the EGR temperature sensor circuit on bank 2, sensor #1. This P2034 DTC refers to bank #2 (which is the side of the engine that doesn't contain cylinder #1). Related codes are P2035 (circuit low) and P2036 (circuit high).

An EGT sensor is found on most late model gas or diesel engines. It's nothing more than a heat sensitive resistor that converts the temperature of the exhaust into a voltage signal to the computer. It receives a 5-volt signal from the computer through one wire while the second wire is ground.

The higher the exhaust temperature the less resistance to ground resulting in a higher voltage -- conversely, the lower the temperature the more the resistance resulting in lower voltage. If the engine senses a low voltage, the computer will vary the engine's timing or fuel ratio to keep the temperature in acceptable ranges within the converter.

In a diesel, the EGT is used to determine the timing of regeneration of the PDF (diesel particulate filter) based on the temperature rise.

Example of an EGT exhaust temperature sensor:
P2034 EGT exhaust gas temperature sensor

If a catless up pipe has been installed along with the removal of the catalytic converter, there is normally no provision for the EGT, or if there is it won't function correctly without the back pressure. This will set the code.


The check engine light will illuminate and the computer will have set the code P2034. No other symptoms will be readily recognizable.

Potential Causes

The causes for this DTC may include:

P2034 Repair Procedures

Another reason for this code to set is if the catalytic converter has been replaced in favor of a catback system. In most states this is an illegal procedure punishable by a large fine if caught. It's advisable to check local and state laws concerning the removal of this system since it allows uncontrolled emissions into the atmosphere. This may work, however it is everyone's obligation to do our part to keep our atmosphere clean for future generations.

Until this is repaired the code can be reset by purchasing a 2.2 ohm resistor for pocket change at any electronic store. Simply dispose of the EGT sensor and plug the resistor into the engine side electrical connector. Wrap it with tape and the computer will be satisfied that the EGT is operating properly.

Related P2034 DTC Discussions

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