P0621 Code - Generator Lamp L Control Circuit Malfunction

What Does P0621 Mean?

OBD-II Code P0621 is defined as a Generator Lamp/L Terminal Circuit

The Alternator recharges the Battery when the engine is running. The Alternator is controlled by the engine control module (PCM). If the PCM detects an incorrect signal from the Alternator, the PCM will set code P0621.

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What are the common causes of P0621 ?

• Some aftermarket accessories and performance modifications
• A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.
• An air leak forward of the DPF will change the sensor readings resulting in the code

How do you troubleshoot P0621 ?

The engine system, in conjuction with the engine control module (ECM)/powertrain control module (PCM), activates the P0621 code solenoid valve to control oil pressure to the engine mechanism that is installed in the valve system to switch valve timing between Low and High.If the engine solenoid valve has an open or short circuit, a DTC is stored.

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