P0B92: Hybrid/EV Battery Voltage Sense R Circuit Low

P0B92 stands for an implausibly low reading on sense R. In GM's lithium-ion battery controllers of 2016 and 2019 the limit is 0.2 V or less for 1.4 s inside a 2 s window, Type A; the test is suspended while an open sense line fault is active, so a broken lead appears as P0B90 rather than P0B92. Programmes with a separate battery sensor module (GM 16OBDG02) use under 0.20 V in 14 of 18 samples. The eAssist mild hybrid applies 1.4 V, 7 of 10 samples, Type B. In the 2012 two-mode trucks R is NiMH block 18, and blocks 18 and 19 must both read under 2 V in 15 of 20 samples (Type B). A short of the sense lead to ground or to a lower cell is the classic cause.

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

MIL and hybrid or EV system message
Propulsion limited, possibly no restart

Most likely causes

Sense lead R chafed through and touching ground or a lower cell
Failed input for channel R on the cell monitoring board
Cell or block on channel R genuinely collapsed

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 P0B92 means

P: Powertrain: engine and transmission
0: Generic code: same on every make
B: Subsystem depends on the code range
92: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0B92?

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 P0B92?

The most common causes are: sense lead R chafed through and touching ground or a lower cell; failed input for channel R on the cell monitoring board; cell or block on channel R genuinely collapsed.

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.