AutoCodes – GMC – P0AC4 2016 GMC Sierra

P0AC4 2016 GMC Sierra Code - Hybrid Powertrain Control Module Requested MIL Illumination

Quick Answer

Control modules constantly monitor the vehicle for any condition which may adversely affect vehicle performance. Common causes include Check Hybrid Powertrain Control Module for codes, Faulty Hybrid Powertrain Control Module. 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: P0AC4 2016 GMC Sierra indicates Hybrid Powertrain Control Module Requested MIL Illumination.
Common causes: Common causes include Check Hybrid Powertrain Control Module for codes, Faulty Hybrid Powertrain Control Module.
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 254

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 Jul 15, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0AC4 2016 GMC Sierra Description

Control modules constantly monitor the vehicle for any condition which may adversely affect vehicle performance. If a condition is detected, the module sets a Diagnostic Trouble Code (DTC) and sends a serial data message to the Engine Control Module (ECM). The ECM sets a DTC to inform that the module has set a DTC. The serial data message sent by the module also contains a request for the ECM to illuminate the Malfunction Indicator Lamp (MIL).
The DTC will be set when the ECM receives a serial data message from the Hybrid Powertrain Control Module indicating that DTC has been set in the module.

OBDII Code P0AC4 2016 GMC Sierra - Hybrid Powertrain Control Module Requested MIL Illumination - AutoCodes.com — P0AC4 2016 GMC Sierra Code - Hybrid Powertrain Control Module Requested MIL Illumination

What does this mean?

What are the Possible Causes of the DTC P0AC4 2016 GMC Sierra?

Check Hybrid Powertrain Control Module for codes
Faulty Hybrid Powertrain Control Module

How to Fix the DTC P0AC4 2016 GMC Sierra?

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 does this mean?

Code Tech Notes

The P0AC4 code is an information code only, if there are no other engine codes, then the Hybrid Powertrain Control Module needs to be diagnose.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0AC4 2016 GMC Sierra 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.

Need more information about the P0AC4 2016 GMC Sierra code?

Need more information on how to fix the P0AC4 2016 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0AC4 2016 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 P0AC4 2016 GMC Sierra Code

1. What does the OBDII code P0AC4 mean on a 2016 GMC Sierra?

P0AC4 indicates that the Hybrid Powertrain Control Module has requested the Malfunction Indicator Lamp (MIL) to illuminate due to a detected issue in the hybrid powertrain system.

2. What are the common symptoms of the P0AC4 code on a 2016 GMC Sierra?

Symptoms may include the Check Engine Light (MIL) being illuminated, reduced fuel efficiency, diminished hybrid system performance, and possible hesitation during acceleration.

3. What causes the P0AC4 code to appear on a 2016 GMC Sierra?

Possible causes include a faulty Hybrid Powertrain Control Module, wiring or connector issues, a malfunctioning hybrid battery pack, or software issues in the control module.

4. Can driving with the P0AC4 code cause further damage to my 2016 GMC Sierra?

Driving with the P0AC4 code may lead to reduced hybrid system efficiency or further damage to hybrid-related components. Itâ€™s best to diagnose and address the issue promptly.

5. How do I diagnose the P0AC4 code on a 2016 GMC Sierra?

Diagnosis involves scanning for additional codes, inspecting wiring and connectors in the hybrid system, testing the Hybrid Powertrain Control Module, and checking the hybrid battery pack for issues.

6. Can a weak hybrid battery trigger the P0AC4 code?

Yes, a weak or failing hybrid battery can cause irregularities in the hybrid system, leading the Hybrid Powertrain Control Module to request MIL illumination with the P0AC4 code.

7. What repairs are commonly needed to fix the P0AC4 code on a 2016 GMC Sierra?

Repairs may include replacing the Hybrid Powertrain Control Module, repairing or replacing damaged wiring or connectors, reprogramming the module, or servicing the hybrid battery pack.

8. How much does it cost to fix the P0AC4 code on a 2016 GMC Sierra?

Repair costs vary depending on the issue but can range from $200 for minor wiring repairs to over $2,000 for hybrid battery replacement or module repairs.

9. Can a software update fix the P0AC4 code on a 2016 GMC Sierra?

In some cases, a software update for the Hybrid Powertrain Control Module may resolve the issue if itâ€™s caused by outdated programming or firmware.

10. Is the P0AC4 code specific to hybrid GMC Sierras?

Yes, the P0AC4 code is specific to hybrid models and pertains to the Hybrid Powertrain Control Module and its interaction with the hybrid system components.