Technical Description of OBD-II Trouble Code
The circuit for the Exhaust Gas Temperature EGT Sensor in Bank 1 Sensor 2 is registering a high voltage condition.
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) P2033 refers to the condition of the EGT (exhaust gas temperature) sensor located in the “up” pipe before the catalytic converter. Its purpose is to protect the converter from damage caused by excessive heat. This code indicates that the circuit has a high voltage condition.
Code P2032 is a similar code that indicates a “low” voltage condition in the circuit. Both codes relate to the condition of the sensor, and the solution is the same for both. This P2033 DTC specifically refers to Bank #1, which is the side of the engine that contains cylinder #1. The DTC P2036 is essentially the same, but it applies to bank 2.
An EGT sensor is present in most late model gas or diesel engines. It is 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 rises, resulting in a higher voltage. Conversely, the resistance increases as the temperature decreases, resulting in a lower voltage. If the engine detects a high 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.
If a catless up pipe has been installed and the catalytic converter has been removed, there is usually no provision for the EGT sensor, or if there is, it will not function correctly without back pressure. This will trigger the code.
Example of an EGT exhaust temperature sensor:
Symptoms
The check engine light will illuminate, and the computer will store the code P2033. No other symptoms will be immediately noticeable.
Potential Causes
The possible causes for this DTC may include:
P2033 Repair Procedures
Another reason for this code to be triggered is if the catalytic converter has been replaced with a catback system. In most states, this is an illegal procedure that carries 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 the resistor method described below may temporarily resolve the code, 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.
