Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2014EXPRESS 2500 BASE, VAN CARGO, 6.6L ENG VIN LREPAIR AND DIAGNOSISENGINE MECHANICALSTARTERBATTERY, CHARGING SYSTEM AND STARTING SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURES (BATTERY, CHARGING SYSTEM AND STARTING SYSTEM)DTC P0622: GENERATOR F-TERMINALCONDITIONS FOR SETTING THE DTC (BATTERY, CHARGING SYSTEM AND STARTING SYSTEM)
2014 Chevrolet Express 2500 Base, Van Cargo, 6.6L Eng VIN L
Conditions For Setting The DTC (Battery, Charging System And Starting System)
2014 Chevrolet Express 2500 Base, Van Cargo, 6.6L Eng VIN LSECTION Conditions For Setting The DTC (Battery, Charging System And Starting System)
- DTC P0621 is not set.
- Ignition ON, engine OFF (Prior to Ignition ON, the ignition must have been OFF for at least 5 seconds), the ECM detects a PWM signal that is greater than 65% for 5 seconds.
- Engine running at less than 3, 000 RPM - The ECM detects a PWM signal that is less than 5% for 30 seconds.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.