AutoCodes – Generic – P063B

P063B Code - Generator Voltage Sense Circuit Range/Performance

Quick Answer

The Powertrain Control Module (PCM) monitors the Generator (Alternator) voltage output. Common causes include Faulty Alternator, Alternator harness is open or shorted, Alternator circuit poor electrical connection. 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: P063B indicates Generator Voltage Sense Circuit Range/Performance.
Common causes: Common causes include Faulty Alternator, Alternator harness is open or shorted, Alternator circuit poor electrical connection.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 2,390

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 May 01, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P063B Description

The Powertrain Control Module (PCM) monitors the Generator (Alternator) voltage output. The PCM sets the OBDII code if the alternator output voltage is less than the Battery feed circuit voltage.

OBDII Code P063B - Generator Voltage Sense Circuit Range/Performance - AutoCodes.com — P063B Code - Generator Voltage Sense Circuit Range/Performance

What does this mean?

What are the Possible Causes of the DTC P063B?

Faulty Alternator
Alternator harness is open or shorted
Alternator circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P063B?

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 P063B 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 P063B code?

Need more information on how to fix the P063B code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P063B code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P063B Chrysler — Generator Voltage Sense Circuit Range/Performance
P063B Dodge — Generator Voltage Sense Circuit Range/Performance
P063B Jeep — Generator Voltage Sense Circuit Range/Performance

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.