P0ABC: Hybrid/EV Battery Pack Voltage Sense A Circuit Low

P0ABC is stored when the pack voltage sensor reports a value below anything the battery could really have, pointing to a short to ground or a lost sense signal rather than a discharged pack. GM's 2016 and 2019 hybrid tables set it below 4.8 V with system voltage above 10.2 V, after 8 failed samples out of 10 taken every 25 ms, and rate it Type A with MIL on the first trip. The 2013 table for an earlier hybrid uses a limit of 30 V, 7 of 10 samples and Type B. A real deep discharge is handled by other codes such as P0AFA. Because the controller no longer trusts pack voltage, hybrid operation is restricted or the vehicle will not go ready.

High severity. Can I keep driving?If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.

Symptoms

Hybrid system or check engine warning on
Vehicle may refuse to enter ready mode
Engine runs continuously, no electric drive

Most likely causes

Sense line shorted to ground or disconnected
Sense fuse or link open so no voltage reaches the input
Battery controller measurement input defective

What to check, in order

Start with the simplest. You can tick off each step.

Read the codes with a hybrid-compatible scanner and write down the freeze frame data
With the connector unplugged, check whether the signal wire is making contact with ground.
Make sure the battery cooling air intake is clean
Check the 12 V auxiliary battery, which can also trigger warnings
Leave any high-voltage measurements to a specialized repair shop

Good to know

It can trigger limp mode.
It affects emissions.

What each character of P0ABC means

P: Powertrain: engine and transmission
0: Generic code: same on every make
A: Hybrid or air and fuel
BC: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0ABC?

If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.

What causes code P0ABC?

The most common causes are: sense line shorted to ground or disconnected; sense fuse or link open so no voltage reaches the input; battery controller measurement input defective.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.