AutoCodes – GMC – P0AC4 2014 GMC Sierra

P0AC4 2014 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 2014 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 212

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 2014 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 2014 GMC Sierra - Hybrid Powertrain Control Module Requested MIL Illumination - AutoCodes.com — P0AC4 2014 GMC Sierra Code - Hybrid Powertrain Control Module Requested MIL Illumination

What does this mean?

What are the Possible Causes of the DTC P0AC4 2014 GMC Sierra?

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

How to Fix the DTC P0AC4 2014 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 2014 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 2014 GMC Sierra code?

Need more information on how to fix the P0AC4 2014 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0AC4 2014 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 2014 GMC Sierra Code

1. What does the OBDII code P0AC4 mean for a 2014 GMC Sierra?

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

2. What are the common symptoms of code P0AC4 in a 2014 GMC Sierra?

Symptoms may include the check engine light turning on, reduced fuel efficiency, diminished hybrid performance, or the vehicle operating solely on the internal combustion engine.

3. What causes the P0AC4 code to appear in a 2014 GMC Sierra?

Common causes include faults in the Hybrid Powertrain Control Module, issues with wiring or connectors, or failures in hybrid system components.

4. Can driving with the P0AC4 code cause further damage?

Yes, ignoring this code can lead to decreased performance or damage to hybrid system components if the underlying issue is not addressed.

5. How is the P0AC4 code diagnosed in a 2014 GMC Sierra?

A mechanic will use a scan tool to check for related codes, inspect wiring and connectors, and perform tests on the hybrid system to identify the root cause.

6. How can the P0AC4 code be fixed on a 2014 GMC Sierra?

Repairs may involve replacing or repairing damaged wiring, connectors, or components of the hybrid system, and updating or reprogramming the Hybrid Powertrain Control Module.

7. What tools are needed to diagnose the P0AC4 code on a 2014 GMC Sierra?

Diagnostic tools include an advanced OBDII scan tool capable of reading hybrid system codes and performing module tests.

8. Is the P0AC4 code specific to hybrid vehicles?

Yes, this code is specific to hybrid vehicles, as it relates to the Hybrid Powertrain Control Module.

9. How much does it cost to repair the P0AC4 code on a 2014 GMC Sierra?

Repair costs vary depending on the exact issue but can range from $100 for minor wiring fixes to over $1,000 for replacing major hybrid components.

10. Can the P0AC4 code be cleared without fixing the issue?

Clearing the code without addressing the underlying problem may temporarily turn off the MIL, but the code is likely to return and the problem will persist.