AutoCodes – Generic – P0AC1

P0AC1 Code - Hybrid Battery Pack Current Sensor 'A' Circuit Low

Quick Answer

The battery current sensor, which is mounted on the positive cable side of the HV battery assembly, detects the amperage that flows into the HV battery. Common causes include Hybrid battery junction block, Faulty Battery Smart Unit, Battery Smart Unit 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: P0AC1 indicates Hybrid Battery Pack Current Sensor 'A' Circuit Low.
Common causes: Common causes include Hybrid battery junction block, Faulty Battery Smart Unit, Battery Smart Unit 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 5,317

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 May 11, 2019

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

The battery current sensor, which is mounted on the positive cable side of the HV battery assembly, detects the amperage that flows into the HV battery. The battery smart unit inputs a voltage, which varies between 0 and 5 V in proportion to the amperage, into the IB terminal from the battery current sensor. An output voltage of the battery current sensor below 2.5 V indicates that the HV battery is being discharged, and above 2.5 V indicates that the HV battery is being charged. The power management control ECU determines the charging and discharging amperage of the HV battery based on the

OBDII Code P0AC1 - Hybrid Battery Pack Current Sensor 'A' Circuit Low - AutoCodes.com — P0AC1 Code - Hybrid Battery Pack Current Sensor 'A' Circuit Low

What does this mean?

What are the Possible Causes of the DTC P0AC1?

Hybrid battery junction block
Faulty Battery Smart Unit
Battery Smart Unit harness is open or shorted
Battery Smart Unit circuit poor electrical connection

How to Fix the DTC P0AC1?

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 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 P0AC1 code?

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Information for Specific Makes

P0AC1 Buick — Hybrid/EV Battery Low Resolution Current Sensor Circuit Low Voltage
P0AC1 Cadillac — Hybrid/EV Battery Low Resolution Current Sensor Circuit Low Voltage
P0AC1 Chevrolet — Hybrid/EV Battery Low Resolution Current Sensor Circuit Low Voltage
P0AC1 GMC — Hybrid/EV Battery Low Resolution Current Sensor Circuit Low Voltage
P0AC1 Lexus — Hybrid Battery Pack Current Sensor 'A' Circuit Low
P0AC1 Saturn — Hybrid/EV Battery Low Resolution Current Sensor Circuit Low Voltage
P0AC1 Toyota — Hybrid Battery Pack Current Sensor 'A' Circuit Low

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.