P0B67: Hybrid/EV Battery Voltage Sense I Circuit Intermittent/Erratic

SAE J2012 reserves P0B67 for an unsteady signal on channel I, meaning readings that spike, drop and recover. No manufacturer documents this code publicly, and none of the GM tables that define the other four channel I codes includes an erratic test. The fault picture would sit between an open circuit (P0B63) and a frozen value (P0B64): the line works most of the time but loses contact under vibration, heat or current load. CARB requires battery voltage sensors to be monitored as inputs of the energy storage system, which explains why the code exists at all. For diagnosis, record cell voltage I with a scan tool during a drive and compare its noise with neighbouring channels H and J.

Symptoms

• Sporadic warning without a reproducible pattern
• Momentary drop in electric power

Most likely causes

• Sense contact on channel I opening under vibration or heat
• Corroded terminal in the module connector

What to check, in order

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

1. Read the codes with a hybrid-compatible scanner and write down the freeze frame data
2. Gently move the wiring with the engine running and watch whether the reading changes.
3. Make sure the battery cooling air intake is clean
4. Check the 12 V auxiliary battery, which can also trigger warnings
5. 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 P0B67 means

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

Frequently asked questions

Can I keep driving with code P0B67?

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 P0B67?

The most common causes are: sense contact on channel I opening under vibration or heat; corroded terminal in the module connector.

Related codes

• P0B63Hybrid/EV Battery Voltage Sense I Circuit
• P0B64Hybrid/EV Battery Voltage Sense I Circuit Range/Performance
• P0B65Hybrid/EV Battery Voltage Sense I Circuit Low
• P0B66Hybrid/EV Battery Voltage Sense I Circuit High
• P0B62Hybrid/EV Battery Voltage Sense H Circuit Intermittent/Erratic
• P0B6CHybrid/EV Battery Voltage Sense J Circuit Intermittent/Erratic

Sources

• law.cornell.edu: 13 CCR 1968.2
• gsi.ext.gm.com: 19OBDG01 Hybrid Diagnostics

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.