P0429 Code - Catalyst Heater Control Circuit Bank 1

What Does P0429 Mean?

The PCM has detected a catalyst efficiency that is below the normal operating threshold for a specific engine bank. The PCM utilizes exhaust composition and temperature data from the oxygen sensors to calculate what degree of catalyst efficiency is required. If this level is not detected, then the code will be stored and the service engine light will be illuminated.

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What are the common causes of P0429 ?

There are three main culprits that may be responsible for P0429:

• The catalyst temperature sensor harness is either shorted or completely open
• The catalyst temperature sensor circuit is suffering from a poor connection
• The catalyst temperature sensor has become faulty

How do you troubleshoot P0429 ?

There are currently two main types of cylinder deactivation used today, depending on the type of engine. P0429 code for the pushrod design which uses solenoids to alter the oil pressure delivered to the lifters. In their collapsed state, the lifters are unable to elevate their companion pushrods under the valve rocker arms, resulting in valves that cannot be actuated and remain closed.

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