Guide To P0B91 OBD Error Code Solutions

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It is important to know that the wrong battery voltage will affect the engine performance as well as the fuel economy. Also affected by the sluggish acceleration and the braking risk, the OBD code P0B91 gets stored in the PCM indicating problematic hybrid battery Voltage Sense “R” Circuit Range/Performance issue.

This diagnostic fault code is a generic powertrain code, which means that it would apply to the OBD-II equipped vehicles. The specific repair steps can vary as it depends upon the vehicle make and model.

What causes this problem with the Hybrid Battery Voltage Sense "R" Circuit Range/Performance?

• Problematic Hybrid Battery Pack
• Faulty, open or shorted battery connectors and wiring harness
• Damaged electrical connection to the battery
• Powertrain Control Module faults

1. Battery Current Sensor – Faulty battery current sensor will affect the performance of the vehicle and thus might need replacement. Buy new Battery Current Sensor now!
2. Car Battery – If the car battery is damaged, the electrical components of the vehicle will not work properly or might not work at all. Replace faulty car battery today!
3. Battery Coolant Pump – It is important to regulate the battery temperatures to keep it functioning properly. Buy new battery coolant pump from us!
4. Engine Control Module – If the ECM is faulty, the vehicle will not operate properly and might also lead to wrong diagnosis. Thus, replace old components now!
5. Powertrain Control Module – If all the components are functioning properly, then the PCM can itself be at fault. Buy new PCM components now!
6. Hybrid Battery – The major reason behind OBD code P0B91 getting stored in the faulty hybrid battery. Thus, replace it now!
7. Electronic Control Unit – If the OBD code P0B91 is flashing, always remember to check the ECU itself for faults. Buy new ECU from us!
8. Starter Motor – The engine will have problems with starting and will stall with the starter motor doesn’t work properly. Replace faulty motor now!
9. Car Battery & Cables – Check for faulty car battery and cables and replace now!
10. Diagnostic Tool - In order to detect the error, one needs high grade diagnostic tools. Visit us today to grab amazing deals.
11. Exhaust Manifold – Replace faulty exhaust manifolds as they can also be the prime reason for OBD code P0B91 getting stored in the PCM.

After knowing all the cause behind the issues, let’s have a look at few common symptoms of this problem. Read through this section to learn more about this P0B91 error code.

Common Symptoms

• Malfunction Indicator Light On
• Sluggish acceleration
• Affected fuel economy
• Lights and electrical components not working properly
• PCM and ECU faults

Want to correct the Trouble Code P0B91? Read these points mentioned below:

• Replace the defective hybrid battery cut off switch harness
• Replace faulty battery current sensor
• Repair or replace the quirky car battery
• Rehabilitate the defaults in the hybrid battery cut off switch
• The malfunctioning hybrid battery cut off switch circuit should be repaired or replaced
• Check and repair the faults in the hybrid battery cut off switch circuit
• Perform proper service of the unsound hybrid battery

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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 P0B91 code to be stored:

• The mechanic or the technician will use a diagnostic scanner or code reader like DVOM to visually scan for the error codes in the vehicle.
• After performing a careful inspection, every of the stored codes and freeze frame data are retrieved as it can help down the way for further diagnosis process.
• Most often he has to inspect the solenoid itself to see if they are faulty or damaged. Additional error codes that are stored in the vehicle are also addressed.
• The mechanic performs a continuity test between the PCM and solenoid to check the resistance.
• If the solenoid or the control modules are not faulty, he will then retune the code and test drive the vehicle.
• On test driving, if the P0B91 code does not return soon, he will know that an erratic condition exits.
• But if the error returns instantaneously, he will check every components of the control module as well as the circuit like connectors, wires, harness, fuses etc. for any possible fault.
• If any component is damaged, he will fix them right away.
• After performing this repair, he will inspect the transmission fluid as well as its level.
• If the level is below the manufacturer’s specification, it has to be refilled and if the fluid is murky or contaminated it needs to be replaced.
• Every time a repair work is carried out, make sure that the mechanic test drives the vehicle after every repair so that the diagnosis is successful. This can eventually help him to know as to where the error occurred.

Common Mistakes When Diagnosing the P0B91 Code

• PCM and ECU failure
• Wiring and connectors damaged, broken or short
• Hybrid battery failure