P0ABB: Hybrid/EV Battery Pack Voltage Sense A Circuit Range/Performance

P0ABB is a plausibility check: the measured pack voltage is within electrical limits but does not agree with what the individual cells add up to. GM documents it in several hybrid tables. From 2016 the battery controller flags it when pack voltage and the sum of cell voltages differ by more than 10 V in 32 of 40 samples; the 2013 table compares the pack reading with 32 times the average cell voltage and uses a 5.49 V limit. Both are Type B, so the MIL needs two trips. The check is suppressed while cell voltage circuit faults are active. P0ABC and P0ABD cover hard low or high readings, P0AF8 compares the pack sensor with the inverter bus voltage.

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

Check engine or hybrid system warning light
Erratic state-of-charge display
Reduced electric power

Most likely causes

Pack voltage measurement drifted (divider or input aging)
Faulty cell voltage tap distorting the cell sum
High-resistance busbar or sense connection

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
Compare the reading with other engine data while varying the engine speed.
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 P0ABB means

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

Frequently asked questions

Can I keep driving with code P0ABB?

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 P0ABB?

The most common causes are: pack voltage measurement drifted (divider or input aging); faulty cell voltage tap distorting the cell sum; high-resistance busbar or sense connection.

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.