P0439 Code - Catalyst Heater Control Circuit Bank 2

What Does P0439 Mean?

The poor running symptoms are consistent with a MAP sensor malfunction. In addition, in some cases, a bad MAP sensor will not throw a code. Again, the ELD code likely represents a separate wiring issue. When you see P0439 engine fault code on your engine code reader this description will help you.

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What are the common causes of P0439 ?

Most of the time, this code appears when a catalytic converter is faulty. However, bad oxygen sensors are equally likely. If an oxygen sensor code is also stored in the PCM, it is more likely that the oxygen sensors are to blame.
A faulty converter usually means that there is an underlying cause, such as:

• Using the wrong fuel type
• A faulty coolant temperature sensor
• A faulty mass air flow sensor
• A faulty manifold air pressure sensor
• A faulty fuel pressure regulator or other fuel injection component
• Contaminated oil

Other causes may include:

• Faulty catalyst temperature sensor
• Poor electrical connection in the catalyst temperature sensor
• Open or short catalyst temperature sensor harness

How do you troubleshoot P0439 ?

Look for damage to the tank indicating impact that may have damaged the fuel pump or sender. Use the DVOM to test resistance and continuity on all system circuits if actuator and sensor resistance levels are in compliance with manufacturer's specifications.

Process Tips

Diagnostic trouble code P0439 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before P0439.

Fortunately, P0439 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

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