P0B93 — Hybrid Battery Voltage Sense "R" Circuit High

OBD2 code P0B93 flags a problem with the sensor and actuator circuits (hybrid battery voltage sense "R" circuit high). The car is usually drivable while you plan the repair. Common culprits: blown fuse feeding the circuit, corroded, loose or damaged connector, poor ground connection.

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 P0B93 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 "R" for damage, corrosion, chafing or poor contact.
Subsystem check With the hybrid battery voltage sense "R" disconnected, measure signal voltage at the harness connector: a high reading with the component unplugged indicates a short to power in the harness; if it drops to normal, the component itself is faulty.
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 P0B93 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for P0B93 (parts and labor, USD, independent shop rates): Repair wiring or connectors: $80–$250; Control module repair: $300–$1,000; Replace the faulty sensor or actuator: $150–$500. Overall, fixing P0B93 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

Will P0B93 clear itself?

Sometimes P0B93 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.

What does OBD2 code P0B93 mean?

How much does it cost to fix P0B93?

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

What is the most common cause of P0B93?

The most common causes are: blown fuse feeding the circuit, corroded, loose or damaged connector, poor ground connection.

How do I diagnose P0B93 myself?

Start with a scan: confirm P0B93, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the hybrid battery voltage sense "R", and verify the suspect component against live data before buying parts.

When the engine control unit detects that a specific voltage reading is climbing beyond its acceptable window, it logs a diagnostic trouble code to flag the problem. Code P0B93 points to an over-voltage condition on the hybrid battery voltage sense "R" circuit. In plain terms, the module expects to see a signal within a certain voltage range, but instead it is reading something much closer to full battery voltage — a clear sign that something is pulling the circuit high when it should not be.

The voltage sense circuit on a hybrid battery plays a monitoring role. It feeds data back to the control module about how much charge remains and how the pack is performing. When P0B93 sets, it means the module has run its verification checks across multiple drive cycles and confirmed the abnormal reading is real, not a momentary glitch. The ECU also saves a freeze frame — a snapshot of engine RPM, load, temperature, and vehicle speed captured at the exact moment the fault occurred. That data is invaluable during diagnosis because it tells you what conditions were present when the problem surfaced.

Common Symptoms of P0B93

An illuminated Check Engine light or hybrid system warning indicator on the dashboard
The vehicle dropping into limp mode, limiting power output and speed
Intermittent operation or complete failure of the hybrid battery management system
Noticeably higher fuel consumption due to reduced hybrid functionality
In some cases, the auxiliary systems linked to the hybrid pack may stop working entirely

What Causes P0B93?

A broken or disconnected ground return wire for the hybrid battery voltage sense "R" circuit, forcing the signal high
The signal wire shorted directly to battery positive voltage somewhere in the harness
A failed voltage sense component internally pulling the circuit up to reference voltage
Corroded, loose, or physically damaged connector pins disrupting the circuit integrity
Chafed or broken wiring that exposes the signal line to a power source
An internal driver fault within the control module itself
A blown fuse protecting that specific circuit branch
Poor chassis ground connection upstream of the sensing circuit

How to Diagnose P0B93

Hook up an OBD2 scanner and confirm that P0B93 is stored in the powertrain control module. Record the associated freeze frame data before clearing anything — those readings describe exactly what the engine was doing when the fault appeared.
Review any other trouble codes present alongside P0B93. Related codes often point toward a shared root cause such as a power supply issue or a ground fault affecting multiple circuits. Also check for applicable technical service bulletins on nhtsa.gov or your manufacturer's site using your VIN.
Perform a hands-on inspection of the wiring harness and connectors tied to the hybrid battery voltage sense "R." Look for worn insulation, rubbed-through wires, moisture intrusion, and bent or pushed-out pins.
With the voltage sense component unplugged, probe the harness-side connector for signal voltage. If you still read near battery voltage with the part disconnected, the harness itself has a short to power. If the voltage drops to normal operating range, the problem lies within the sensor or actuator.
Verify reference voltage, ground continuity, and signal integrity at the component connector using a multimeter. Check each circuit individually for resistance that exceeds specification.
While monitoring live data on the scanner, gently wiggle the harness and connectors during a test drive. Any signal dropout or erratic reading points to a broken wire hidden inside the insulation.
After repairs, clear P0B93 and complete a full drive cycle that reproduces the conditions stored in the freeze frame. The code must stay cleared and not return under normal operation.

Repair Options and Costs for P0B93

The repair approach depends entirely on which part of the circuit is at fault. Addressing the cheapest and most frequent culprits first makes financial sense before moving to more expensive components:

Wiring harness repair or connector replacement: $80–$250
Control module diagnosis and repair: $300–$1,000
Replacement of the faulty hybrid battery voltage sense sensor or actuator: $150–$500

How Much Does It Cost to Fix P0B93?

Total cost for addressing P0B93 falls anywhere from $80 on the low end up to $1,000 at the high end. Most situations involve damaged wiring or a bad connector, and those repairs are relatively straightforward. Control module work is uncommon but commands a premium because it requires specialized programming. A faulty voltage sense component falls in the middle of the range. Getting an accurate diagnosis before purchasing parts is the smartest move — the worst-case scenario is rarely the first thing to check.

Can You Drive with P0B93?

In most vehicles this code does not leave you stranded. The car remains driveable, though you may notice sluggish acceleration, a disabled hybrid mode, or a lit warning lamp. However, if the malfunction causes stalling, prevents the engine from starting, or triggers stability or braking warnings, treat it as an emergency and stop driving immediately. Overall, P0B93 ranks as low severity from a safety standpoint, but electrical faults left unaddressed tend to worsen over time.