AutoCodes – Chevrolet – P0622 2018 Chevrolet Silverado

P0622 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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 471

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 15, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0622 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado - Generator F-Terminal Circuit - AutoCodes.com — P0622 2018 Chevrolet Silverado Code - Generator F-Terminal Circuit

What does this mean?

What are the Possible Causes of the DTC P0622 2018 Chevrolet Silverado?

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 2018 Chevrolet Silverado?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0622 2018 Chevrolet Silverado 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.

Need more information about the P0622 2018 Chevrolet Silverado code?

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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 2018 Chevrolet Silverado Code

1. What does the OBDII code P0622 mean on a 2018 Chevrolet Silverado?

P0622 indicates an issue with the Generator F-Terminal Circuit, which is part of the vehicle's charging system responsible for regulating the alternator's output.

2. What are the common symptoms of the P0622 code in a 2018 Chevrolet Silverado?

Common symptoms include a dead battery, dim or flickering lights, charging system warning light on the dashboard, or the alternator not charging the battery properly.

3. What causes the P0622 code to appear on a 2018 Chevrolet Silverado?

Causes may include a faulty alternator, damaged or corroded wiring in the F-terminal circuit, a defective PCM (Powertrain Control Module), or poor electrical connections.

4. Can I drive my 2018 Chevrolet Silverado with a P0622 code?

Driving with a P0622 code is not recommended, as it can lead to a drained battery and potential vehicle breakdown due to the alternator not charging properly.

5. How do I diagnose the P0622 code on my 2018 Chevrolet Silverado?

Diagnosis involves checking the alternator, inspecting the F-terminal circuit wiring and connections for damage, and testing the PCM for proper communication with the alternator.

6. How do I fix the P0622 code on a 2018 Chevrolet Silverado?

Repairs may include replacing the alternator, repairing or replacing damaged wiring in the F-terminal circuit, cleaning corroded connections, or reprogramming/replacing the PCM if necessary.

7. How much does it cost to repair the P0622 code on a 2018 Chevrolet Silverado?

Costs can vary, but replacing an alternator typically ranges from $400 to $1,000, while wiring repairs may cost $100 to $300. PCM replacement or reprogramming may cost $500 to $1,500.

8. Will clearing the P0622 code fix the issue on my 2018 Chevrolet Silverado?

Clearing the code without addressing the underlying problem will not fix the issue, and the code is likely to return until the root cause is resolved.

9. Can a faulty battery cause the P0622 code on a 2018 Chevrolet Silverado?

While a faulty battery is not a direct cause of the P0622 code, a weak or failing battery can strain the charging system, potentially contributing to related issues.

10. Is the P0622 code a common issue for the 2018 Chevrolet Silverado?

The P0622 code is not especially common but can occur due to alternator wear, wiring issues, or electrical system problems over time. Regular maintenance can help prevent it.