Error Code P1421 is defined as Cold Start Control. A problem which is detected when the PCM (powertrain control module, also known as ECM or engine control module in other 2018 Dodge Durango makes) wasn’t able to monitor the engine’s idle speed and ignition timing when the engine is started with pre-warming up condition.
This error code is a manufacturer-specific trouble code, meaning it does not apply to all cars makes. Rather, it applies only to specific 2018 Dodge Durango makes, such as Nissan. Specification on the definition, troubleshooting, and repairs still vary from one make and model to another.
The PCM controls both the engine idle speed and ignition timing when the engine is started with a pre-warming up condition. This control promotes the activation of the three-way catalyst by heating the catalyst and reduces emissions.
As with other error codes, this code activates the Check Engine light and registers the code in your 2018 Dodge Durango ’s system.
Many factors contribute to this error code, some of the common causes are:
Technicians start their diagnosis by using and OBD-II reader.
In most cases, Error Code P1421 can be fixed by just reprogramming the PCM (or for Nissan make ECM). Dealerships can offer to reprogram of this code, and the problem (along with the Check Engine light) can be fixed in no time.
The dealership will not charge you anything if your 2018 Dodge Durango is still under warranty.
There is a factory service bulletin for the following Nissan models:
Check these service bulletins to get the best solution for your 2018 Dodge Durango .