AutoCodes – Generic – P06B1

P06B1 Code - Sensor Supply Voltage Circuit Low Voltage

Quick Answer

The generator control module, also called the starter/generator control module is comprised of the following three control modules: the hybrid/EV powertrain control module 1, the 14 V power module, and the drive motor control module. Common causes include Faulty Starter/Generator Control Module, Starter/Generator Control Module harness is open or shorted, Starter/Generator Control Module 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: P06B1 indicates Sensor Supply Voltage Circuit Low Voltage.
Common causes: Common causes include Faulty Starter/Generator Control Module, Starter/Generator Control Module harness is open or shorted, Starter/Generator Control Module 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.

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Code Popularity 9,404

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 20, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P06B1 Description

The generator control module, also called the starter/generator control module is comprised of the following three control modules: the hybrid/EV powertrain control module 1, the 14 V power module, and the drive motor control module. These three control modules are non-serviceable and are part of the generator control module.
The drive motor control module uses an internal 15 V reference power supply in order to operate the drive motor sensors and processor. This fault is handled inside the generator control module and no external circuits are involved.
The Diagnostic Trouble Code (DTC) will be set when the reference voltage is less than 8.8 V for 1 second.

OBDII Code P06B1 - Sensor Supply Voltage Circuit Low Voltage - AutoCodes.com — P06B1 Code - Sensor Supply Voltage Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P06B1?

Faulty Starter/Generator Control Module
Starter/Generator Control Module harness is open or shorted
Starter/Generator Control Module circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P06B1?

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 P06B1 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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Information for Specific Makes

P06B1 Buick — Sensor Supply Voltage Circuit Low Voltage
P06B1 Cadillac — Sensor Supply Voltage Circuit Low Voltage
P06B1 Chevrolet — Sensor Supply Voltage Circuit Low Voltage
P06B1 GMC — Sensor Supply Voltage Circuit Low Voltage

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.