Technical Description of OBD-II Trouble Code
The circuit for the Exhaust Gas Temperature (EGT) Sensor on Bank 2 Sensor 2 is experiencing low voltage.
What does that mean?
This is a generic powertrain code that applies to all makes and models from 1996 onwards. However, the 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 before the catalytic converter. Its main purpose is to protect the converter from damage caused by excessive heat.
Code P2034 indicates a general malfunction detected in 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 does not contain cylinder #1. Related codes are P2035 (circuit low) and P2036 (circuit high).
An EGT sensor is present in most late model gas or diesel engines. It is essentially a heat-sensitive resistor that converts the exhaust temperature into a voltage signal for the computer. It receives a 5-volt signal from the computer through one wire, while the second wire serves as the ground.
The resistance to ground decreases as the exhaust temperature increases, resulting in a higher voltage. Conversely, the resistance increases as the temperature decreases, leading to a lower voltage. If the engine detects a low voltage, the computer will adjust the engine’s timing or fuel ratio to maintain an acceptable temperature within the converter.
In a diesel engine, 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:
If a catless up pipe has been installed and the catalytic converter has been removed, there is usually no provision for the EGT. If there is a provision, it will not function correctly without back pressure, resulting in the code being set.
Symptoms
The check engine light will illuminate and the computer will store the code P2034. No other symptoms will be immediately noticeable.
Potential Causes
The possible causes for this DTC may include:
P2034 Repair Procedures
Another reason for this code to be set is if the catalytic converter has been replaced with a catback system. In most states, this is an illegal procedure that can result in a large fine if caught. It is advisable to check local and state laws regarding the removal of this system, as it allows uncontrolled emissions into the atmosphere. While this may resolve the issue, it is everyone’s responsibility to contribute to keeping our atmosphere clean for future generations.
Until this issue is repaired, the code can be reset by purchasing a 2.2 ohm resistor for a small amount of money at any electronic store. Simply remove 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 functioning properly.
