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

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

OBD-II DTC Datasheet

Exhaust Gas Temperature EGT Sensor Circuit Bank 2 Sensor 2 Low

What does this mean?

This is a generic transmission code which means it covers all makes / models from 1996 onwards. However, specific troubleshooting steps may differ from vehicle to vehicle.

This Diagnostic Trouble Code (DTC) P2034 refers to the condition of the EGT (exhaust gas temperature) sensor located in the "upper" pipe before the catalytic converter. Its sole purpose in life is to protect the transducer from damage due to excessive heat.

Code P2034 denotes a common malfunction detected in the exhaust gas recirculation temperature sensor circuit at block 2, sensor # 1. This DTC P2034 applies to block # 2 (the side of the engine missing cylinder # 1). Associated codes: P2035 (signal low) and P2036 (signal high).

The EGT sensor is found on most recent models of gasoline or diesel engines. It is nothing more than a temperature-sensitive resistor that converts the temperature of the exhaust gases into a voltage signal for the computer. It receives a 5V signal from the computer over one wire and the other wire is grounded.

The higher the exhaust gas temperature, the lower the ground resistance, resulting in a higher voltage - conversely, the lower the temperature, the greater the resistance, resulting in a lower voltage. If the engine detects low voltage, the computer will change the engine timing or fuel ratio to keep the temperature within the acceptable range inside the converter.

In diesel, EGT is used to determine the PDF (Diesel Particulate Filter) regeneration time based on the temperature rise.

Example of an EGT exhaust gas temperature sensor:

If, when removing the catalytic converter, a pipe was installed without a catalytic converter, then, as a rule, the EGT is not provided, or, if it is, it will not work correctly without back pressure. This will install the code.

symptoms

The check engine light will come on and the computer will set a code P2034. No other symptoms will be easy to recognize.

Possible reasons

Reasons for this DTC may include:

• Check for loose or corroded connectors or terminals, which is often the case
• Broken wires or lack of insulation can cause a short circuit directly to ground.
• The sensor may be out of order
• Catback exhaust system without EGT installation.
• It is possible, though unlikely, that the computer is out of order.

P2034 Repair Procedures

• Raise the car and find the sensor. For this code, it refers to the bank 1 sensor, which is the side of the engine that contains cylinder # 1. It is located between the exhaust manifold and the converter or, in the case of a diesel engine, upstream of the Diesel Particulate Filter (DPF). It differs from oxygen sensors in that it is a two-wire plug. On a turbocharged vehicle, the sensor will be located next to the turbocharged exhaust gas inlet.
• Check the connectors for any abnormalities such as corrosion or loose terminals. Trace the pigtail to the connector and check it.
• Look for signs of missing insulation or exposed wires that may short to ground.
• Disconnect the top connector and remove the EGT sensor. Check resistance with an ohmmeter. Check both connector terminals. A good EGT will have about 150 ohms. If the resistance is very low - below 50 ohms, replace the sensor.
• Use a hair dryer or heat gun and heat the sensor while observing an ohmmeter. The resistance should drop as the sensor heats up and rise as it cools. If not, replace it.
• If everything was good at this point, turn on the key and measure the voltage on the cable from the motor side. The connector should have 5 volts. If not, replace the computer.

Another reason for setting this code is that the catalytic converter has been replaced with a return system. In most states, this is an illegal procedure that, if discovered, is punishable by a large fine. It is recommended to check local and national laws regarding the disposal of this system as it allows uncontrolled emissions to the atmosphere. It might work, but everyone has a responsibility to do their part to keep our atmosphere clean for future generations.

Until this is repaired, the code can be reset by purchasing a 2.2 ohm change resistor from any electronics store. Just dispose of the EGT sensor and connect the resistor to the electrical connector on the motor side. Wrap it with tape and the computer will verify that the EGT is working properly.

Related DTC discussions

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