AutoCodes – Chevrolet – P1A56 Chevrolet

P1A56 Chevrolet 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 Chevrolet 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 1,610

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

What does this mean?

What are the Possible Causes of the DTC P1A56 Chevrolet?

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 Chevrolet?

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 Chevrolet 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 Chevrolet Code

1. What does the OBDII code P1A56 mean on a Chevrolet?

P1A56 indicates an issue with the Hybrid/EV system voltage, often related to the battery pack or voltage sensing circuits.

2. What are the common symptoms of code P1A56 in a Chevrolet?

Symptoms may include a check engine light, reduced power mode, decreased fuel efficiency, or the vehicle not starting.

3. What causes the P1A56 code to trigger in a Chevrolet?

Common causes include faulty voltage sensors, wiring issues, a damaged hybrid battery pack, or problems with the power inverter module.

4. Can I drive my Chevrolet with a P1A56 code?

It is not recommended to drive with a P1A56 code, as it may lead to further damage or leave the vehicle inoperable.

5. How is the P1A56 code diagnosed in a Chevrolet?

Technicians use an advanced scan tool to check voltage readings, inspect wiring and connectors, and test the hybrid battery pack and related components.

6. What repairs are needed to fix the P1A56 code?

Repairs may include replacing a faulty voltage sensor, repairing damaged wiring, or replacing the hybrid battery pack or inverter module.

7. How much does it cost to fix the P1A56 code on a Chevrolet?

Repair costs vary, but diagnosing and fixing the issue can range from $200 to $5,000, depending on whether the hybrid battery or inverter needs replacement.

8. Can a weak 12V battery cause the P1A56 code?

While unlikely, a weak 12V battery can sometimes affect hybrid system performance and should be tested to rule it out.

9. Does the P1A56 code mean the hybrid battery needs replacement?

Not always. The issue could be with sensors, wiring, or the inverter module, so proper diagnosis is essential.

10. How can I prevent the P1A56 code from occurring again?

Regular maintenance, inspecting hybrid system components, and addressing any warning lights promptly can help prevent this code.

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