P0B67 — Hybrid Battery Voltage Sense "I" Circuit Intermittent/Erratic

OBD2 code P0B67 flags a problem with the sensor and actuator circuits (hybrid battery voltage sense "I" circuit intermittent/erratic). The car is usually drivable while you plan the repair. Common culprits: control module driver fault, blown fuse feeding the circuit, corroded, loose or damaged connector.

powertrain (engine/transmission)

Is it safe to drive?

Short-term driving is OK In most cases the car remains drivable, possibly with reduced performance or a disabled auxiliary system. If symptoms include stalling, no-start or brake/steering warnings, treat it as urgent.

How to diagnose with an OBD scanner

Read the code and freeze frame Connect an OBD2 scanner, confirm P0B67 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the hybrid battery voltage sense "I" circuit intermittent/erratic for damage, corrosion, chafing or poor contact.
Subsystem check Measure reference voltage, ground and signal continuity at the component connector.
Subsystem check Wiggle-test the harness while watching the signal in live data — dropouts reveal broken wires.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P0B67 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for P0B67 (parts and labor, USD, independent shop rates): Control module repair: $300–$1,000; Replace the faulty sensor or actuator: $150–$500; Repair wiring or connectors: $80–$250. Overall, fixing P0B67 usually costs between $80 and $1,000. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

What is the most common cause of P0B67?

The most common causes are: control module driver fault, blown fuse feeding the circuit, corroded, loose or damaged connector.

Will P0B67 clear itself?

Sometimes P0B67 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

Is it safe to drive with P0B67?

In most cases the car remains drivable, possibly with reduced performance or a disabled auxiliary system. If symptoms include stalling, no-start or brake/steering warnings, treat it as urgent.

How much does it cost to fix P0B67?

Control module repair — $300–$1,000; Replace the faulty sensor or actuator — $150–$500; Repair wiring or connectors — $80–$250. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

How do I diagnose P0B67 myself?

Start with a scan: confirm P0B67, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the sensor and actuator circuits, and verify the suspect component against live data before buying parts.

When your hybrid or plug-in hybrid vehicle logs code P0B67, the powertrain control module is reporting that the voltage sense circuit labeled "I" is behaving unpredictably. Rather than holding a steady reading, the signal coming from the hybrid battery's voltage monitoring circuit is jumping around or cutting out intermittently. The module won't trigger this light based on a single bad reading—it needs to see this erratic behavior repeat under specific conditions before the Check Engine indicator illuminates.

The "I" designation in this circuit refers to one of multiple parallel voltage sense channels that monitor the high-voltage hybrid battery pack. Each channel feeds data back to the battery management system, which uses those readings to balance cell voltages, manage charging, and protect the pack from over- or under-voltage conditions. When the control module sees a channel flip between valid readings and nonsense values—dropouts, voltage spikes, or flatline zeros—it logs P0B67 to flag that the hybrid battery voltage feedback loop has become unreliable. Think of it as the battery's nervous system sending garbled messages to the brain.

Typical Symptoms

When P0B67 sets, you may notice one or more of the following:

Check Engine Light or hybrid system warning lamp activates on the dashboard
The hybrid system operates in a limited or "limp home" mode, reducing electric assist
Intermittent stuttering or hesitation during acceleration when the battery is being accessed
Fuel economy drops noticeably compared to your normal driving pattern
The vehicle may fail to enter all-electric EV mode, forcing the gasoline engine to run more often
In some cases, the auxiliary systems powered by the hybrid battery may behave erratically or shut down temporarily

Most Common Causes

The culprits behind P0B67 typically fall into three categories, listed here from most to least frequently encountered:

Corroded, loose, or damaged connector at the battery voltage sense module or control unit
Wiring harness damage—chafed insulation, broken strands, or intermittent shorts in the sense circuit
Blown fuse or poor power/ground supply to the voltage sensing electronics
Control module internal driver failure within the battery management system
Failed voltage sense sensor or contactor within the hybrid battery assembly itself

Diagnostic Approach

Follow these steps to isolate the root cause before replacing any expensive components:

Connect a quality OBD2 scanner, confirm P0B67 is present, and record the freeze frame data—this snapshot captures engine load, RPM, temperature, and vehicle speed at the moment the fault triggered. Replicate those exact conditions during your road test.
Pull all related diagnostic trouble codes. Codes in other hybrid-related categories often point directly to the failing component. Check manufacturer TSB databases for known software updates or service campaigns tied to P0B67 on your specific make and model.
Perform a thorough visual inspection of the wiring harness routing near the hybrid battery and control module. Look for pinched wires, melted insulation near hot exhaust components, and any signs of water intrusion or corrosion at the connectors.
With the connector unplugged, use a multimeter to verify reference voltage, ground continuity, and signal integrity at the harness side. Compare your readings against the manufacturer's specification values.
Reconnect the harness and perform a wiggle test while monitoring live data on the scanner. Watch for signal dropouts or sudden value jumps as you flex the wiring loom.
Clear the code, complete a full drive cycle—including the conditions from your freeze frame—and verify that P0B67 does not reappear before considering the repair complete.

Repair Options and Pricing

Depending on what your diagnosis uncovers, here are the typical repair routes and their associated costs:

Wiring repair or connector replacement: $80–$250
Sensor or actuator replacement within the voltage sense circuit: $150–$500
Control module repair or replacement: $300–$1,000

Always start with the least expensive possibilities—connectors and wiring—before committing to module or battery-level repairs.

Total Repair Cost Summary

For most vehicles, fixing P0B67 lands somewhere between $80 and $1,000 depending on which part fails. An accurate diagnosis upfront prevents spending $500 on a new sensor when the real issue was simply a corroded terminal. Independent shop labor rates typically run $75–$120 per hour, so a straightforward connector repair might take under an hour while a full module replacement could stretch to three or four hours plus programming.

Can You Drive With P0B67?

In most cases the vehicle remains drivable when P0B67 is active, though you may experience reduced hybrid performance, limited EV-only operation, or slightly higher fuel consumption. However, if the erratic voltage sensing causes the battery management system to conservatively shut down auxiliary functions—or if you notice stalling, no-start conditions, or warnings affecting brakes and steering—treat this as an urgent repair and avoid extended driving until the issue is resolved.