P0622 GMC - Generator Field Control Circuit Malfunction
P0622 GMC Possible Causes
- Battery charge
- Faulty Generator (Alternator)
- Generator harness is open or shorted
- Generator circuit poor electrical connection
- Engine Control Module (ECM) controlled generator
- Faulty ECM
First diagnose P0622 GMC code
Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded terminals.
P0622 GMC Tech NotesIf the battery is OK then the alternator is more than likely the problem.
There is a factory service bulletin for the following GMC models:
2010 GMC Savana
2011 GMC Savana
2011 GMC Sierra
GMC Factory Service Bulletin OBDII Code P0622
Cost of diagnosing the P0622 GMC code
Labor: 1.0The cost of diagnosing the P0622 GMC code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
P0622 GMC Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P0622 Gmc DescriptionThe Engine Control Module (ECM) uses the generator turn on signal circuit to control the generator. A high side driver within the ECM allows the ECM to turn the generator ON and OFF. When Generator operation is desired, the ECM sends a 5 volt signal to the voltage regulator via the generator turn on signal circuit. This causes the voltage regulator to begin controlling the generator field circuit. Once the Generator is enabled by the ECM, the voltage regulator controls generator output independently of the ECM. Under certain operating conditions, the ECM can turn Off the generator by turning Off the 5 volt signal on the generator turn on signal circuit.
P0622 GMC More InformationNeed more information on how to fix the P0622 GMC code?
Get Access to Factory Service Manuals
Need more help?Get the P0622 Gmc code diagnosed by a professional: Find a repair shop in your area
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