AutoCodes – Generic – P1A56

P1A56 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 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 1,164

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

What does this mean?

What are the Possible Causes of the DTC P1A56?

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?

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 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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Information for Specific Makes

P1A56 Buick — Hybrid/EV System Voltage
P1A56 Cadillac — Hybrid/EV System Voltage
P1A56 Chevrolet — Hybrid/EV System Voltage
P1A56 GMC — Hybrid/EV System Voltage

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 Code

1. What are the common symptoms of OBDII code P1A56 (Hybrid/EV System Voltage)?

- Common symptoms include a warning light on the dashboard, reduced vehicle performance, and possible difficulties starting the vehicle.

2. What can cause the OBDII code P1A56 (Hybrid/EV System Voltage) to appear?

- The code can be triggered by issues with the high voltage battery, hybrid system components, wiring faults, or a malfunctioning battery management system.

3. How can I diagnose the source of the OBDII code P1A56 (Hybrid/EV System Voltage)?

- A comprehensive diagnosis by a qualified technician is recommended using a scan tool to gather data from the vehicle's hybrid system and related components.

4. What are some repair tips for addressing OBDII code P1A56 (Hybrid/EV System Voltage)?

- Repair tips may include checking the high voltage battery connections, inspecting the hybrid system components for damage, and ensuring proper functioning of the battery management system.

5. Can I continue driving my vehicle with the OBDII code P1A56 (Hybrid/EV System Voltage) present?

- It is not advisable to continue driving the vehicle with this code present, as it can lead to further damage to the hybrid system components and potentially unsafe driving conditions.

6. How much does it typically cost to repair OBDII code P1A56 (Hybrid/EV System Voltage)?

- The cost of repairing this code can vary depending on the specific underlying issue, but it may involve components replacement, wiring repairs, or software updates, potentially ranging from a few hundred to over a thousand dollars.

7. Can I reset the OBDII code P1A56 (Hybrid/EV System Voltage) using an OBDII scanner?

- While resetting the code may temporarily turn off the warning light, it is essential to address the underlying cause of the issue to prevent it from reoccurring.

8. How long does it typically take to repair OBDII code P1A56 (Hybrid/EV System Voltage)?

- The repair time can vary based on the diagnosis and the extent of the issue, but it may take a few hours to a full day for a skilled technician to identify and resolve the problem.

9. Is it safe to attempt DIY repairs for OBDII code P1A56 (Hybrid/EV System Voltage)?

- Due to the complexity and high voltage nature of hybrid systems, it is generally recommended to have a trained professional handle repairs related to OBDII code P1A56 to ensure safety and proper resolution.

10. How can I prevent OBDII code P1A56 (Hybrid/EV System Voltage) from appearing in the future?

- Regular maintenance, including checking the high voltage battery condition, monitoring the hybrid system performance, and addressing any warning lights promptly, can help prevent the recurrence of this code.