What does the code P0621 mean?
Generator Lamp/L Terminal Circuit
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.
What is a generator lamp control circuit?
The PCM monitors the continuity of the generator lamp control circuit every time the engine is running. The generator lamp control circuit plays a vital role in the operation and maintenance of battery charge levels.
What is a generator L terminal?
The L-terminal circuit from the generator is a discrete circuit (a discrete circuit has no splices and only one source and one destination) into the PCM. A small amount of current flows from this circuit through the generator windings to create a magnetic field which starts the generator process.
How do I fix code P0621?
What repairs can fix the P0621 code?
- Use the OBD-II scanner to check the vehicle.
- Reset the codes and then test drive the vehicle to see if the code returns.
- They will inspect the wiring and connections.
- The mechanic will replace any damaged, corroded, or disconnected wires, connectors, and other components.
What does Incorrect immobilizer key mean?
Error Code P0513 is defined as Incorrect Immobilizer Key, which means the engine’s computer has found a problem with the immobilizer ID. If the ignition cylinder is turned on, the engine is cranked (but not yet started). If the PCM fails to detect the key, then the Error Code P0513 will be set.
What is generator field control?
[′jen·ə‚rād·ər ′fēld kən‚trōl] (electricity) Method of regulating the output voltage of a generator by controlling the voltage which excites the field of the generator.
What is generator F terminal signal?
The F in the description means the Field Coil Control circuit is at fault. The Field Coil is arguably the most recognizable from its windings, which are visible through the vent holes of most alternators. It surrounds the generator armature and remains stationary in the housing of the alternator.
What does P1637 mean?
P1637 either means there’s voltage on the alternator “L” terminal when you first start, or that there’s low voltage on the “L” terminal after the PCM has enabled the alternator with startup voltage.