Fault code P2569 – direct ozone reduction catalyst temperature sensor circuit low

Fault code P2569 is called “Direct Ozone Reduction Catalyst Temperature Sensor Circuit Low” 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 P2569

Diagnostic code P2569 means that the Powertrain Control Module (PCM) has detected a low signal level in the electrical circuit of the catalyst temperature sensor. These sensors are used in ultra-low emission vehicles. They have a special coating to convert smog from ambient air to oxygen.

Fault code P2569 – direct ozone reduction catalyst temperature sensor circuit low

Temperature sensors are placed before and after the catalyst to monitor its temperature and efficiency. The entire system is controlled either by the PCM or by a stand-alone controller that communicates with the PCM.

The controller processes the data from the temperature sensors as well as other parameters to determine the emission content of the exhaust. Accurate data is needed to keep the exhaust temperature within acceptable parameters and to ensure optimal NOx filtration.

If the PCM detects a low signal in the electrical circuit of the direct ozone reduction catalyst temperature sensor. Then code P2569 will be stored and the malfunction indicator light may illuminate.

Symptoms of vehicle malfunctions

The main signal that an error P2569 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 stored as a fault).
  2. Other related fault codes may also be present.
  3. Increased emissions of harmful substances in the exhaust gases.
  4. Increased fuel consumption.
  5. Reduced engine power output.
  6. Excessive black smoke from the vehicle’s tailpipe.
  7. Sometimes there may be no symptoms, despite a stored fault code.

A stored fault code P2569 should be considered serious and corrected as soon as possible. If the code is not corrected, it may cause damage to the catalytic converter.

Factors that can cause this error code

The error code P2569 can mean that one or more of the following problems have occurred:

  • Damaged or faulty exhaust temperature sensor.
  • Damaged or incorrectly wired exhaust temperature sensor.
  • Exhaust leaks in front of the catalytic converter.
  • Installation of non-original or high-performance exhaust system components.
  • Sometimes the cause is a faulty PCM module or programming error.

How to fix or reset OBD-2 code P2569

Some suggested steps for troubleshooting and fix the error code P2569:

  1. Read all error codes stored in the vehicle’s PCM memory with an OBD-II scan tool.
  2. Check the operation of the exhaust temperature oxygen sensor.
  3. Diagnose other error codes that may have caused code P2569.
  4. Repair any exhaust gas leaks.
  5. Test-drive the vehicle to check the operation of the exhaust temperature sensor.
  6. Replace or reprogram the faulty PCM if necessary.

Diagnose and repair of problems

If there are no additional errors, clear fault code P2569 and perform a short test drive. To allow the PCM to go into closed loop mode, then scan the system again and see if the code has returned.

Check the catalytic converter and leaks

Check for exhaust leaks, repair them if necessary. Inspect any electrical connections that are connected to the exhaust temperature sensor. Sometimes heat and vibration can cause the electrical connector to disconnect and the engine error indicator light will come on.

If a code is found, check the operation of the sensor to make sure it is working properly. Compare the displayed output signals with the values indicated in the manual.

Test temperature sensor, inspect wiring

Check the wiring harness that goes to the exhaust temperature sensor. It is important to make sure that there are no burned out, broken or severely loose spots. Which could hit any moving component while the car is in motion.

Check the operation of the sensor by thoroughly warming up the engine. Remember that the sensor will only work once it has reached its operating temperature.

Connect the sensor output to a multimeter and start the engine at about 2000-2500 rpm. The output should have a voltage fluctuating between 0.1 and 0.9 V. If the sensor output does not change or the response time is too long. This means you have a bad sensor, you should replace it.

Replacing the sensor will most likely correct the error. But sometimes, you need to replace the catalytic converter to fix the problem. If code P2569 is combined with other codes, try to fix the other codes first.

On which vehicles does this problem occur most frequently

Fault code P2569 can occur on different vehicles but there are statistics on which brands this occurs most often. Here is a list of some of them:

  • BMW
  • Volkswagen

Fault code P2569 can sometimes be found with other errors. The most common are the following: P2567, P2568, P2570, P2571.

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