AutoCodes – GMC – P0AC1 GMC

P0AC1 GMC Code - Hybrid/EV Battery Low Resolution Current Sensor Circuit Low Voltage

Quick Answer

The hybrid/EV battery current sensor is mounted inside the hybrid/EV battery pack. Common causes include Faulty Battery Energy Control Module, Battery Energy Control Module harness is open or shorted, Battery Energy Control Module circuit poor electrical connection. 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: P0AC1 GMC indicates Hybrid/EV Battery Low Resolution Current Sensor Circuit Low Voltage.
Common causes: Common causes include Faulty Battery Energy Control Module, Battery Energy Control Module harness is open or shorted, Battery Energy Control Module circuit poor electrical connection.
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 1,284

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 Apr 24, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0AC1 GMC Description

The hybrid/EV battery current sensor is mounted inside the hybrid/EV battery pack. The positive high voltage cable that goes to the positive contactor relay passes through the hybrid/EV battery pack current sensor. The hybrid/EV battery pack current sensor detects the amperage that flows in and out of the hybrid/EV batteries. The battery energy control module supplies and monitors a 5 V reference signal to the hybrid/EV battery pack current sensor. The hybrid/EV battery pack current sensor returns a signal between 0 and 5 V to the battery energy control module. The hybrid/EV battery pack current sensor signal is in proportion to the amperage going in and out of the hybrid/EV battery pack. A signal voltage of the hybrid/EV battery pack current sensor greater than 2.5 V indicates that the hybrid/EV battery is being charged and a signal voltage less than 2.5 V indicates discharging. The hybrid/EV battery pack current sensor has 2 measurement ranges in order to maintain accuracy. The ranges are low resolution and high resolution. The measurement ranges of the hybrid/EV battery pack current sensor have some overlap with each other. The high resolution measures from -23 to +23 A. The low resolution measures from -470 to +280 A.

OBDII Code P0AC1 GMC - Hybrid/EV Battery Low Resolution Current Sensor Circuit Low Voltage - AutoCodes.com — P0AC1 GMC Code - Hybrid/EV Battery Low Resolution Current Sensor Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0AC1 GMC?

Faulty Battery Energy Control Module
Battery Energy Control Module harness is open or shorted
Battery Energy Control Module circuit poor electrical connection

How to Fix the DTC P0AC1 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 P0AC1 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 P0AC1 GMC Code

1. What does the OBDII code P0AC1 mean for a GMC vehicle?

The P0AC1 code indicates an issue with the Hybrid/EV battery's low-resolution current sensor circuit, specifically detecting a low voltage condition.

2. What are the common symptoms of the P0AC1 code in a GMC vehicle?

Symptoms may include an illuminated check engine light, reduced hybrid system performance, limited EV mode functionality, or decreased fuel efficiency.

3. What causes the P0AC1 code to appear in a GMC vehicle?

Common causes include a faulty low-resolution current sensor, damaged wiring or connectors, a malfunctioning hybrid battery control module, or low hybrid battery voltage.

4. Can I drive my GMC vehicle with the P0AC1 code active?

It is not recommended to drive with this code active, as it may lead to reduced performance, potential damage to the hybrid system, or an inability to use the EV mode.

5. How is the P0AC1 code diagnosed in a GMC vehicle?

A technician will typically use a scan tool to check for additional codes, inspect the sensor and wiring, and test the hybrid battery control module for proper function.

6. How do you fix the P0AC1 code on a GMC vehicle?

Repairs may include replacing the low-resolution current sensor, repairing damaged wiring or connectors, or reprogramming/replacing the hybrid battery control module.

7. Is the P0AC1 code specific to GMC vehicles?

No, the P0AC1 code is a generic OBDII code and can appear in other hybrid or EV vehicles, but the exact diagnosis and repair steps may vary by manufacturer.

8. How much does it cost to repair the P0AC1 code on a GMC vehicle?

Repair costs vary depending on the issue but may range from $100â€“$500 for sensor or wiring repairs, with higher costs if the hybrid battery control module needs replacement.

9. Can a weak hybrid battery cause the P0AC1 code?

Yes, a weak or failing hybrid battery can contribute to the P0AC1 code if it affects the current sensor's voltage readings.

10. How can I prevent the P0AC1 code from occurring in my GMC vehicle?

Regular maintenance of the hybrid system, inspecting wiring and sensors for damage, and addressing warning lights promptly can help prevent this code.