P06B1 2018 GMC Sierra 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 2018 GMC Sierra 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.
Code P06B1 2018 GMC Sierra Description
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.
What are the Possible Causes of the DTC P06B1 2018 GMC Sierra?
- 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 2018 GMC Sierra?
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 2018 GMC Sierra 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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Frequently Asked Questions about P06B1 2018 GMC Sierra Code
1. What does the OBDII code P06B1 mean on a 2018 GMC Sierra?
P06B1 indicates a "Sensor Supply Voltage Circuit Low Voltage," meaning the voltage supplied to certain sensors is lower than specified by the manufacturer.
2. What are the common symptoms of code P06B1 in a 2018 GMC Sierra?
Symptoms may include illuminated check engine light, reduced engine performance, hard starting, or erratic sensor readings.
3. What causes code P06B1 on a 2018 GMC Sierra?
Common causes include a faulty powertrain control module (PCM), wiring issues like shorts or corrosion, a defective sensor, or a weak battery.
4. Can a low battery cause the P06B1 code?
Yes, a weak or failing battery can cause low voltage in the sensor supply circuit, triggering the P06B1 code.
5. How do you diagnose the P06B1 code on a 2018 GMC Sierra?
Diagnosis involves checking for loose or damaged wiring, testing the battery and alternator, inspecting sensors for faults, and using a scan tool to monitor voltage levels.
6. Is it safe to drive a 2018 GMC Sierra with code P06B1?
Driving with this code is not recommended, as it may lead to poor engine performance or further damage to the vehicle's electrical system.
7. What sensors are affected by the P06B1 code on a 2018 GMC Sierra?
This code typically affects sensors that rely on a 5-volt reference signal, such as the throttle position sensor (TPS) or manifold absolute pressure (MAP) sensor.
8. How can I fix the P06B1 code on my 2018 GMC Sierra?
Repairs may include fixing or replacing damaged wiring, cleaning corroded connectors, replacing faulty sensors, or reprogramming or replacing the PCM.
9. Can the P06B1 code reset itself after repairs?
In some cases, the code may reset after repairs are made, but it’s recommended to clear the code manually with a scan tool and verify the fix.
10. How much does it cost to repair the P06B1 code on a 2018 GMC Sierra?
Repair costs vary depending on the cause but can range from $50 for minor wiring repairs to $500 or more for PCM replacement or sensor issues.
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