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AutoCodes – Chevrolet – P0622 Chevrolet

P0622 Chevrolet Code - Generator F-Terminal Circuit

Quick Answer

The Engine Control Module (ECM) uses the Generator field duty cycle signal circuit, or F-terminal circuit, to monitor the duty cycle of the Generator. Common causes include Battery charge, Faulty Generator, Generator harness is open or shorted. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0622 Chevrolet indicates Generator F-Terminal Circuit.
Common causes
Common causes include Battery charge, Faulty Generator, Generator harness is open or shorted.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code Popularity 28,587
How popular is this code, among other codes? Low
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Table of contents Created and updated by William Orellana on Jul 15, 2022
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Code P0622 Chevrolet Description

The Engine Control Module (ECM) uses the Generator field duty cycle signal circuit, or F-terminal circuit, to monitor the duty cycle of the Generator. The Generator field duty cycle signal circuit connects to the high side of the field windings in the generator. A Pulse Width Modulated (PWM) high side driver in the voltage regulator turns the field windings ON and OFF. The ECM uses the PWM signal input to determine the generator load on the engine. This allows the ECM to adjust the idle speed to compensate for high electrical loads. The ECM monitors the status of the generator field duty cycle signal circuit. When the ignition is ON and the engine is OFF, the ECM should detect a duty cycle near 0%. When the engine is running, the duty cycle should be between 5 - 99%. The Diagnostic Trouble Code (DTC) will be set if the ignition is ON, and the engine OFF (Prior to Ignition ON, the ignition must have been OFF for at least 5 s), the ECM detects a PWM signal that is greater than 65% for 5 s.
OBDII Code P0622 Chevrolet - Generator F-Terminal Circuit - AutoCodes.com
P0622 Chevrolet Code - Generator F-Terminal Circuit
What does this mean?

What are the Possible Causes of the DTC P0622 Chevrolet?

  • Battery charge
  • Faulty Generator
  • Generator harness is open or shorted
  • Generator circuit poor electrical connection
  • Faulty Engine Control Module (ECM)

How to Fix the DTC P0622 Chevrolet?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

If the battery is OK, then the alternator is more than likely the problem.

There is a Factory Service Bulletin for the following Chevrolet models:
2010 Chevrolet Express
2011 Chevrolet Express
2011 Chevrolet Silverado
Chevrolet Factory Service Bulletin OBDII Code P0622









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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0622 Chevrolet code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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Need more information on how to fix the P0622 Chevrolet code? Get Access to Factory Service Manuals

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Get the P0622 Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0622 Chevrolet Code

1. What does the P0622 code mean on a Chevrolet?

The P0622 code indicates a malfunction in the generator (alternator) F-terminal circuit, which can affect charging system performance.

2. What are the common symptoms of the P0622 code?

Symptoms include a battery warning light on the dashboard, poor battery charging, dim headlights, and potential engine stalling.

3. What causes the P0622 code on a Chevrolet?

Common causes include a faulty alternator, damaged F-terminal wiring, corroded connectors, or a malfunctioning powertrain control module (PCM).

4. How do I diagnose the P0622 code?

Start by inspecting the alternator, F-terminal wiring, and connectors for damage or corrosion. Use a multimeter to test voltage output and continuity in the circuit.

5. Can I drive my Chevrolet with the P0622 code?

Driving with this code is not recommended, as it can lead to battery drain and potential engine stalling due to insufficient charging.

6. How is the P0622 code fixed?

Repairs may include replacing the alternator, repairing damaged wiring or connectors, cleaning corroded terminals, or reprogramming the PCM if necessary.

7. How much does it cost to fix the P0622 code?

The cost varies depending on the issue, but alternator replacement typically ranges from $300 to $800, including labor.

8. Can a bad battery cause the P0622 code?

While a bad battery itself doesn’t cause this code, it can exacerbate charging system issues and make diagnosis more difficult.

9. What tools are needed to troubleshoot the P0622 code?

You’ll need an OBDII scanner, a multimeter, and basic hand tools to inspect and test the alternator and wiring.

10. Is the P0622 code specific to Chevrolet vehicles?

No, the P0622 code can appear on other vehicles as well, but the specific diagnosis and repair steps may vary by manufacturer.

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