Fault code P2429 – exhaust gas temperature too high (Bank 2)

Fault code P2429 is called “Exhaust Gas Temperature (EGT) Too High (Bank 2)” but in different programs it may be called differently. This fault designation applies to all vehicles equipped with OBD-II.

Technical description and explained code P2429

Stored code P2429 means that the Powertrain Control Module (PCM) has detected too high an exhaust temperature (Bank 2). Bank 2 refers to the side of the engine where cylinder 1 is not located.

Fault code P2429 – exhaust gas temperature too high (Bank 2)

Most often, this code indicates a detected common fault with the recirculation system temperature sensor. EGT sensors are used on most recent models of gasoline and diesel engines.

The sensor is a temperature-sensitive resistor that converts the exhaust temperature into a voltage signal for the computer. It receives a 5 V signal from the computer on one wire and the other wire is used for grounding.

The higher the exhaust 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 a low voltage, the computer will change the engine timing or fuel ratio. To keep the temperature within an acceptable range inside the converter.

In diesel engines, the EGT sensor is used to determine the diesel particulate filter (PDF) regeneration time based on temperature rise.

If the control module registers a high exhaust temperature, it attempts to correct this. After unsuccessful attempts to lower the temperature, code P2429 will be stored and the malfunction indicator lamp (MIL) may then illuminate.

Symptoms of vehicle malfunctions

The main signal that an error P2429 has occurred is the Malfunction Indicator Lamp (MIL) is also known as the CheckEngine Light.

It can also be warning signs such as:

  1. The “Check engine” control lamp on the control panel will light up (the code will be written in the memory as a fault).
  2. Detonation in cylinders.
  3. Decrease in engine power.
  4. There may be no symptoms other than the stored fault code.

The severity of code P2429 can range from moderate to severe depending on the specific symptoms of the malfunction. In some cases, the vehicle may go into emergency operation.

Factors that can cause this error code

The error code P2429 can mean that one or more of the following problems have occurred:

  • Exhaust gas temperature sensor (EGT) has failed.
  • Loose or corroded connectors.
  • Broken wires or lack of insulation.
  • Serious exhaust leakage in front of the exhaust temperature sensor.
  • Engine overheating.
  • In rare cases, malfunction of control module (PCM).

How to fix or reset OBD-2 code P2429

Some suggested steps for troubleshooting and fix the error code P2429:

  1. Connect an OBD-II scanner to the vehicle’s diagnostic connector and read all stored data and error codes.
  2. Clear the error codes from the computer memory and test-drive the vehicle to see if code P2429 appears again.
  3. If the error code appears again, visually inspect the electrical wires and connectors related to the exhaust temperature sensor.
  4. If necessary, repair or replace any shorted, broken, damaged, or corroded components.
  5. Check the operation of the exhaust gas temperature sensor (EGT).
  6. Measure the voltage across the circuit using a digital multimeter.
  7. Compare the reading with the manufacturer’s data sheet, and replace the faulty sensor if necessary.
  8. If problem persists, check and replace control module (PCM) if necessary.

Diagnose and repair of problems

The first step in the P2429 troubleshooting process is to review the Technical Service Bulletins (TSB). For known problems with your particular vehicle.

Allow your vehicle’s engine to cool down. In most cases, exhaust gas recirculation systems are very hot. Since they are usually installed directly on the exhaust system. Therefore, if you don’t let the engine cool down, you could get burned.

Check the wires and the sensor

Lift the vehicle and locate the exhaust temperature sensor. Check the connector for any abnormalities such as corrosion or loose terminals. Inspect the wires up to the connector. Look for signs of missing insulation or bare wires that may be shorting to ground.

Disconnect the connector and remove the EGT sensor, check the resistance on both connector terminals with an ohmmeter. A good EGT will have a value of about 150 ohms, if the resistance is below 50 ohms replace the sensor.

Use a hair dryer or heat gun to heat the sensor while observing the ohmmeter. The resistance should fall as the sensor heats up and rise as it cools down, if it does not, replace it.

If the previous tests were successful, turn the ignition key and measure the voltage on the cable on the engine side. There should be 5 volts on the connector, if it is not, there is most likely a problem with the control module.

If the sensor is faulty, you can temporarily reset the P2429 code by buying a 2.2 ohm resistor at any electronics store. Connect the resistor to the electrical connector on the engine side, wrap it with duct tape, and the computer will verify that the EGT is working properly.

On which vehicles does this problem occur most frequently

Fault code P2429 can occur on different vehicles but there are statistics on which brands this occurs most often. Here is a list of some of them:

  • Chevrolet
  • Mercedes-Benz
  • Skoda

Fault code P2429 can sometimes be found with other errors. The most common are the following: P2466, P2467, P2468, P2469, P246A.

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