P0429

2017-10-10

Description:

  • The fault code P0429 indicates that there is an issue with the catalyst heater control circuit for bank 1, and it is detecting high voltage. This may cause the vehicle to fail an emissions test or run poorly.

Possible Symptoms:

  • Check Engine Light (CEL) illuminated

  • Decreased engine performance or power

  • Poor fuel efficiency

Possible Causes:

  • Faulty catalyst heater control circuit

  • Open or short circuit in the catalyst heater control circuit

  • Poor electrical connection in the catalyst heater control circuit

  • Faulty engine control module (ECM)

Related Parts:

  • Catalytic Converter: A catalytic converter is a device that converts toxic gases and pollutants to less harmful pollutants. Problems lead to harmful emissions out of limit, rotten egg smell from exhaust & reduced speed

Possible Solutions:

  • Test and replace the faulty catalyst heater control circuit, if necessary

  • Check for any open or short circuits in the catalyst heater control circuit and repair as needed

  • Ensure proper electrical connections in the catalyst heater control circuit

  • Test and replace the engine control module (ECM) if it is determined to be faulty

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