Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
Search for P0621 Buick Questions and Answers: Search here →
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0621 Buick code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.
What are Code Possible Symptoms?
Engine Light ON (or Service Engine Soon Warning Light)
Code P0621 Buick Description
The Engine Control Module (ECM) uses the Generator turn ON control circuit to control the load of the generator on the engine. A high-side driver in the ECM applies a duty-cycled voltage to the voltage regulator. The duty cycle controls the voltage regulator to turn the field circuit ON and OFF. The ECM monitors the state of the generator turn ON control circuit. The ECM should detect low voltage on the generator and turn on the control circuit when the ignition is ON and the engine is OFF, or when the charging system malfunctions. With the engine running, the ECM should detect a high voltage when the duty cycle voltage is commanded high and a low voltage when the duty cycle voltage is commanded low on the generator turn on the control circuit. The will be set when the ECM detects greater than 3.5 V on the generator control circuit for 5 s with the ignition ON and engine OFF, or the ECM detects a low or high voltage for 15 s on the generator control circuit with the engine running.
P0621 Buick Code - Generator Lamp L Control Circuit Malfunction
Help us improve AutoCodes.com. Leave a comment below or tell us if the information above helps you fix the code. What are the symptoms on your vehicle for the P0621 Buick code? Have you replaced any parts? Any information is appreciated. Thanks