P156F Cadillac 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 Cadillac 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 Cadillac 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 Cadillac?
- 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 Cadillac?
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 Cadillac 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 Cadillac Code
1. What are the common symptoms of OBDII code P156F in a Cadillac?
- Common symptoms include check engine light illumination, reduced engine performance, and potential drivability issues.
2. What does the OBDII code P156F Cadillac mean?
- The code P156F indicates that the High Voltage Allowed Signal Message Counter is Incorrect in the vehicle's system.
3. What are the possible causes of OBDII code P156F in a Cadillac?
- Possible causes include a faulty high voltage battery sensor, wiring issues, software glitches, or problems with the high voltage system.
4. How serious is the OBDII code P156F in a Cadillac?
- While the code may not cause immediate engine failure, it is important to address it promptly to prevent potential damage to the vehicle's high voltage system.
5. Can I continue driving my Cadillac with the OBDII code P156F present?
- It is recommended to avoid driving the vehicle extensively with the code present to prevent further complications and to have the issue diagnosed and repaired as soon as possible.
6. How can I diagnose the OBDII code P156F in my Cadillac?
- Diagnosis typically involves using an OBDII scanner to read the code, checking the high voltage battery sensor, inspecting the wiring, and performing system tests.
7. What are some repair tips for fixing the OBDII code P156F in a Cadillac?
- Repair tips may include replacing the high voltage battery sensor, repairing any damaged wiring, updating software, or seeking assistance from a professional technician.
8. Will resetting the OBDII code P156F in my Cadillac make it go away permanently?
- Simply resetting the code may temporarily clear the check engine light, but if the underlying issue is not addressed, the code is likely to reappear.
9. How much does it typically cost to repair the OBDII code P156F in a Cadillac?
- Repair costs can vary depending on the specific cause of the code, but they may range from a few hundred to over a thousand dollars, including parts and labor.
10. Can I fix the OBDII code P156F in my Cadillac myself, or should I seek professional help?
- While some DIY enthusiasts may attempt to address the code themselves, due to the complexity of the high voltage system, it is often recommended to seek help from a qualified technician for proper diagnosis and repair.
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