P156F GMC Code - High Voltage Allowed Signal Message Counter Incorrect
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, 14 V power module, and the drive motor control module. Common causes include Faulty Hybrid/EV Powertrain Control Module 2, Hybrid/EV Powertrain Control Module 2 harness is open or shorted, Hybrid/EV Powertrain Control Module 2 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
- P156F GMC indicates High Voltage Allowed Signal Message Counter Incorrect.
- Common causes
- Common causes include Faulty Hybrid/EV Powertrain Control Module 2, Hybrid/EV Powertrain Control Module 2 harness is open or shorted, Hybrid/EV Powertrain Control Module 2 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 P156F GMC Description
The Hybrid/EV Powertrain Control Module 2 is constantly sending the Hybrid/EV Powertrain Control Module 1 serial data messages containing high voltage allowed data. These serial data messages are sent through circuits which are part of a communication network called the Controller Area Network (CAN). The Hybrid/EV Powertrain Control Module 1 sets DTC P156F when it detects a discrepancy in the structure of this message causing its integrity to be questioned.
An intermittent fault in the Controller Area Network circuits will cause DTC P156F to set.
What are the Possible Causes of the DTC P156F GMC?
- Faulty Hybrid/EV Powertrain Control Module 2
- Hybrid/EV Powertrain Control Module 2 harness is open or shorted
- Hybrid/EV Powertrain Control Module 2 circuit poor electrical connection
- Faulty Starter/Generator Control Module
How to Fix the DTC P156F GMC?
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 P156F GMC 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 P156F GMC Code
1. What are the common symptoms of OBDII code P156F in a GMC vehicle?
- Common symptoms include check engine light illumination, reduced engine power, and potentially rough or erratic engine performance.
2. What does the OBDII code P156F in a GMC indicate?
- The code P156F indicates that the High Voltage Allowed Signal Message Counter is reporting an incorrect value.
3. What are the potential causes of OBDII code P156F in a GMC?
- Possible causes include a faulty high voltage battery energy control module, issues with the high voltage battery, or a communication error within the hybrid powertrain control module.
4. How can I diagnose the OBDII code P156F in my GMC?
- To diagnose the code, a professional diagnostic scan tool is typically required to read the specific fault codes and data related to the high voltage system.
5. Is it safe to continue driving with OBDII code P156F present in a GMC?
- It is not recommended to continue driving with this code present, as it can lead to further damage or unsafe driving conditions due to potential powertrain issues.
6. Can I repair OBDII code P156F in my GMC myself?
- Repairing this code may require specialized knowledge and tools related to hybrid vehicle systems, so it is often best left to experienced technicians or dealerships.
7. How much does it cost to repair OBDII code P156F in a GMC?
- The cost of repair can vary depending on the specific cause of the issue, but it may involve replacing components such as the high voltage battery energy control module or addressing communication errors.
8. Are there any preventive maintenance tips to avoid OBDII code P156F in a GMC?
- Ensuring regular maintenance of the high voltage system, such as battery checks and software updates, can help prevent issues that may trigger the P156F code.
9. Can a low/high voltage in the vehicle system trigger OBDII code P156F in a GMC?
- Yes, fluctuations in high voltage levels or issues with the high voltage system can potentially trigger the P156F code due to the incorrect signal message counter.
10. How urgent is it to address OBDII code P156F in a GMC?
- It is recommended to address the P156F code promptly to prevent further damage to the vehicle's powertrain system and ensure safe operation of the vehicle.
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