P0B94 OBD Error Code: Problem & Solutions

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Is your vehicle’s check engine light illuminated? Are you experiencing sudden decrease in engine power and acceleration? Is there a drop in the fuel economy with increased level of emissions? All these indicate problem with the car’s hybrid battery and the Powertrain Control Module, thus flashing OBD Code P0B94 error.

If a voltage difference between the battery blocks exceeds the standard readings, the battery smart unit determines that malfunction has occurred and the OBD P0B94 occurs. Thus, the Powertrain Control Module will illuminate the Malfunction Indicator Lamp (MIL) and set a Diagnostic Trouble Code (DTC) in the system thus leading to vehicle going into limp mode.

What causes this problem with the Hybrid Battery Voltage Sense "R" Circuit Intermittent/Erratic?

• Faulty hybrid battery sensor or circuit
• Problem with hybrid battery current sensor and circuit
• Damaged/corroded wiring and connectors
• Weak car battery
• PCM/ECM failure

1. Battery Current Sensor – There can be a case where the battery current sensor is not working properly and is unable to detect any reading. Thus, replace faulty components now!
2. Car Battery – The car battery can also be weak or faulty and thus might need replacement. Thus, replace it now!
3. Battery Coolant Pump – If the coolant pump doesn’t function properly, the battery will not work efficiently. Thus, check and replace as required.
4. Engine Control Module – If the ECM is faulty, the system might not detect the problem at all and might even detect and store wrong OBD error code leading to misdiagnosis. Buy new ECM component now!
5. Powertrain Control Module – Always check for the PCM faults and it might be storing wrong codes or not interpreting the data at all. Thus, replace it in time.
6. Hybrid Battery – The prime reason for OBD code P0B94 getting stored in the system is damaged or faulty hybrid battery. Replace it now!
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8. Starter Motor – If the starter motor is not functioning properly, it must be replaced immediately. Buy new motors from us now!
9.  Car Battery & Cables – It’s better to check for the faults in relation to the car battery and the cables and replace them immediately. Buy best quality parts from us!
10. Exhaust Manifold – Always check for exhaust system faults as a failed exhaust manifold will cause OBD code P0B94 to get stored in the PCM. Buy new exhaust system parts now!

It is vital to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0B94 here:

Common Symptoms

• Low engine power and limited output
• Abnormal throttle response and hard cold starting
• Declined fuel economy
• Sluggish Engine and lot of noise

Learn the ways with which you can correct this trouble code:

• Make sure that the battery cable connections are tight and clean. Some people think that it is an obvious step, but if your computer does not get a steady feed of electricity from the battery, it can cause multiple issues. Check for wires and connectors that might be rubbed through, disconnected or loose. It is also important to check the fuse box in your vehicle together with the relay centre that can be found under the hood.
• It is also important to make sure that the fuses are good. Make sure that there is no melted plastic that can cause fire. These are some of the major wiring problems that you will encounter with error code P0B94. Once you have completely checked all the obvious things and still you can’t find the right solution, then you have to begin suspecting either the computer or the sensor.

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It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P0B94 code to be stored:

• Visually inspect all the wiring and connectors in relation to the sensor and the connector.
• Replace any defective, corroded or shorted wiring and connectors.
• Retest your car’s system once this is done, to ensure that the repairs were done successfully and reconnect the scanner to determine if the codes have cleared.
• Test drive the vehicle to make sure that the malfunction was not intermittent. If the malfunction does seem to be intermittent, use the voltmeter to check the output of the hybrid battery cells.
• Examine the circuitry for contamination that may have leaked out of the engine and check the voltage at the battery current sensor to make sure that it is compatible with the voltage recommended by the manufacturer.
• Also check for the PCM failure as it might be faulty and may require replacement or reprogramming.

Common mistakes when diagnosing the P0B94 code

Most of the time we tend to diagnose the problem without completely identifying the real cause of it. It is important to follow all the diagnostic steps and examine each component carefully before correcting. Always check for other parts apart from battery and current sensor and circuits.