Engine-Codes - Generic - P1421

P1421 Code - Cold Start Control

- Code Popularity: 32,457 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents
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What are the Possible Causes of the DTC P1421?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Lack of intake air volume (block air filter)
  • Fuel injection system (Clogged fuel injector or bad fuel pump)
  • Faulty Engine Control Module (ECM)
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How to Fix the DTC P1421?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the P1421 code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

What Does the P1421 Code Mean?

The Engine Control Module (ECM) controls ignition timing and engine idle speed when the engine is started with pre-warming up condition. This control promotes the activation of three-way catalyst by heating the catalyst and reduces emissions. The Diagnostic Trouble Code (DTC) will be set when the ECM does not control ignition timing and engine speed properly when the engine is started with prewarming up condition.

P1421 Code - Cold Start Control

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Code P1421 Information for Specific Makes

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