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What does the trouble code p1421 mean for a 2010 Nissan Versa?
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★ Top Answer
When your 2010 Nissan Versa shows the P1421 error code, it means there's a problem with the Powertrain control module (PCM). This code specifically relates to an issue called Cold Start Control, which occurs when the Engine Control Module (ECM) fails to monitor the engine's idle speed and ignition timings. This failure prevents the necessary relay chain from activating, resulting in the car not starting. Resolving this issue typically requires a visit to a mechanic to reconfigure the firmware or repair the electrical connections between the PCM and the vehicle's other components.
More answers
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The P1421 code is triggered when the engine control module (ECM) fails to properly regulate ignition timing and engine idle speed when starting the engine in a pre-warmed-up state.
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