AutoCodes – GMC – P1A56 GMC

P1A56 GMC Code - Hybrid/EV System Voltage

Quick Answer

The power inverter module, often referred to as the drive motor generator power inverter module, contains DC high voltage capacitors and a resistor circuit intended to discharge the electrical energy stored within those capacitors. Common causes include Faulty Power Inverter Module, Power Inverter Module, harness is open or shorted. 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: P1A56 GMC indicates Hybrid/EV System Voltage.
Common causes: Common causes include Faulty Power Inverter Module, Power Inverter Module, harness is open or shorted.
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 759

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 Feb 19, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1A56 GMC Description

The power inverter module, often referred to as the drive motor generator power inverter module, contains DC high voltage capacitors and a resistor circuit intended to discharge the electrical energy stored within those capacitors. Whenever the high voltage contactors are opened, the hybrid/EV powertrain control module 1 connects the internal resistor circuit across the capacitor circuit. The level of the high voltage is monitored by the hybrid/EV powertrain control module 1 before and after the resistor circuit has been connected. If the voltage level remains high for too long, the hybrid/EV powertrain control module 1 sets this code and then commands the motor control modules to connect the drive motor 3 phase circuits across the DC high voltage positive and negative circuits thereby discharging the capacitors.

OBDII Code P1A56 GMC - Hybrid/EV System Voltage - AutoCodes.com — P1A56 GMC Code - Hybrid/EV System Voltage

What does this mean?

What are the Possible Causes of the DTC P1A56 GMC?

Faulty Power Inverter Module.
Power Inverter Module. harness is open or shorted
Power Inverter Module. circuit poor electrical connection

How to Fix the DTC P1A56 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 P1A56 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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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.

Frequently Asked Questions about P1A56 GMC Code

1. What does OBDII code P1A56 GMC indicate?

- OBDII code P1A56 GMC indicates an issue with the Hybrid/EV System Voltage in the vehicle.

2. What are the common symptoms of OBDII code P1A56 GMC?

- Common symptoms include a check engine light, reduced hybrid system performance, and potentially difficulty starting the vehicle.

3. What are the possible causes of OBDII code P1A56 GMC?

- Possible causes of this code include a faulty hybrid battery pack, issues with the high voltage wiring, or problems with the hybrid control module.

4. How can I diagnose the OBDII code P1A56 GMC?

- Diagnosis involves using a scan tool to read the code, checking the hybrid system components for visible damage, and performing voltage tests on the hybrid system.

5. Can I still drive my vehicle with the OBDII code P1A56 GMC?

- It is not recommended to drive the vehicle with this code present, as it can affect the performance and safety of the hybrid system.

6. How can I repair OBDII code P1A56 GMC?

- Repairs may involve replacing the hybrid battery pack, repairing or replacing damaged wiring, or recalibrating the hybrid control module.

7. Are there any precautions to take when working on the Hybrid/EV System Voltage issue?

- It is important to follow all safety procedures when working on high voltage systems, including disconnecting the hybrid battery and wearing appropriate personal protective equipment.

8. How much does it typically cost to repair OBDII code P1A56 GMC?

- The cost of repair can vary depending on the specific issue causing the code, but it may range from a few hundred to a few thousand dollars.

9. Can OBDII code P1A56 GMC be triggered by a loose connection?

- Yes, a loose or corroded connection in the hybrid system can sometimes trigger this code, so it's important to check for any loose connections during diagnosis.

10. Is it possible to reset the OBDII code P1A56 GMC without fixing the underlying issue?

- While clearing the code may temporarily turn off the check engine light, the underlying issue causing the code will need to be addressed to prevent it from reoccurring.