Fault Code P0621
Code meaning, symptoms, possible causes, part number, and estimated cost.
P0621
Generator L-Terminal Circuit
Code P0621 indicates a fault in the generator's 'L-Terminal' circuit. This circuit is responsible for information exchange and control between the alternator and the Engine Control Module (ECM) or Powertrain Control Module (PCM).
Part Details
Part Name
Alternator
Reference P/N (OEM)
N/A
General part number for this fault code — not necessarily for your specific vehicle
Estimated Cost
₪700 - ₪1500
Engine Location
Engine compartment
Symptoms
- Check Engine Light on
- Battery warning light on
- Battery discharge
- Hard starting
Possible Causes
- 1Faulty alternator
- 2Short or open wiring
- 3Loose connectors or corrosion
- 4PCM/ECM malfunction
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