Error Code P06B4: What It Means & What To Do?

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The trouble code P06B4 can be elucidated as Sensor Power Supply "B" Circuit Low. When the P06B4 trouble code would be stored in an OBD-II equipped vehicle, then it would mean that the powertrain control module has failed to detect power supply voltage for a specific sensor or group of sensors. It totally depends upon the manufacturer that the sensor might be associated to the exhaust gas recirculation system, the heated exhaust oxygen sensor system, the automatic transmission, or the transfer case (four-wheel drive or all-wheel drive vehicles only). The sensor circuit which is affected has been given the designation A (A & B may be interchanged as well). This code is a generic trouble code, meaning it applies to all vehicles equipped with the OBD-II system, especially those made from 1996 up to present. It’s also more common among Audi, Citroen, Chevrolet, Ford, Hyundai, Nissan, Peugeot, and Volkswagen vehicles. Specifications on the definition, troubleshooting, and repairs, of course, vary from one make and model, powertrain configuration type, to another

Want to learn something more about the P06B4 fault code? There are a lot of OBD-II sensors which are activated by a voltage signal that is provided by the powertrain control module or one of the other on-board controllers. The degree of voltage applied which is known as reference voltage might differ between very low voltage (typically measured in millivolts) up to full battery voltage. The most common sensor voltage signal is 5-volts; followed closely by battery voltage. Obviously, you might need to decide exactly which sensor is associated to this code. A reliable source of automobile information will yield this information.

What causes this problem with the Sensor Power Supply "B" Circuit Low?

• There can be inoperative engine, transmission, or transfer case sensor
• There can be opened or shorted wiring and/or connectors or grounds
• Some issues related to the blown fuse or fusible link
• Defaults in the PCM.

1. Engine Control Module - Most of the time it is difficult to intercept the ECM faults and thus must be checked for thoroughly. There can be a problem with the circuit or the software might have malfunctioned. Thus repair, replace or reprogram the component as per requirement.
2. Powertrain Control Module - If the PCM is faulty, it can store wrong OBD codes and can lead to misdiagnosis. This can happen due to misinterpretation of data received from the various sensors and components which also affects the vehicle’s performance. Thus, replace it immediately.
3. Transmission Control Module - The TCM monitors the functioning of the transmission system and will store this OBD code if the fluid pump does not function properly. Contrary, the TCM can also be faulty and might need reprogramming and replacement. Thus, replace it now!
4. Electronic Control Unit - If the ECU is at fault, it will not be able to read the boost converter temperatures correctly leading to underperformance. Thus, replace faulty ECU now!
5. Engine Wiring Harness - The broken wires in the wiring harness might lead to some serious engine problems. So, make sure that you replace your faulty engine wiring harness to avoid such situation.
6. Diagnostic Tool - Choose from our diagnostic tools collection that will come in handy to detect and correct the OBD error code.

You might be thinking that how would you diagnose these problems? We at Parts Avatar Canada would help you diagnose the major symptoms easily.

Common Symptoms

• The service engine soon light can start lighting up
• The transfer case might be out of order
• No-start condition in the car engine
• Fall in fuel efficiency
• There might be engine hesitation
• Uncertain transmission
• Issues related to harsh transmission

The repairs which you will have to do to correct this fault code are simply straightforward; you can surely pinpoint the necessary repairs on the basis of your diagnosis. Have a look at some common fixes:

• You must fix the defective wiring and/or connectors or grounds
• The malfunctioning engine, transmission, or transfer case sensor should be repaired or replaced as per the need
• Carefully adjust the faults in the PCM or a PCM programming error
• It is necessary to perform proper service of the unsound fuse or fusible link

There is no need to get strained if your OBD Code is still flashing up as we are here at your service. Have a look at our superior variety of powertrain control module, engine control module, ECM, PCM, transfer case module, pcm car, ecm car, pcm module, ecm module and many more. Now all your problems would vanish within no time.

Here are some steps which you should follow in order to diagnose this fault code:

• 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. It is essential to consult your vehicle information source for technical service bulletins (TSB) that replicate the code stored, vehicle (year, make, model, and engine), and symptoms exhibited. If you find the appropriate TSB, it may yield helpful diagnostic information. You will require a diagnostic scanner and a digital volt/ohmmeter to accurately diagnose a code P06B4. A reliable source of vehicle information will also be required. Begin by connecting the scanner to the vehicle diagnostic port and retrieving all stored codes and freeze frame data.
• You will want to write this information down, just in case the code proves to be an intermittent one. After recording all pertinent information, you should clear the codes and test drive the vehicle until the code is reset or the PCM enters readiness mode. If the PCM enters readiness mode, the code is intermittent and will be even more difficult to diagnose. The condition, which caused the P06B4 to be stored, may need to worsen before an accurate diagnosis can be reached. On the other hand, if the code fails to reset and there are no drivability symptoms exhibited, the vehicle can be operated normally. If the P06B4 is immediately reset, proceed with a visual inspection of system related wiring and connectors.
• You can always utilize your source of vehicle information to obtain connector face views, connector pin-out charts, component locators, wiring diagrams, and diagnostic flow charts associated with the code as well as automobile. Now if there is no storage of any other codes and the P06B4 error continues to reset, then you should use the DVOM to check the controller power supply fuses and relays. Make sure to restore the blown fuses, relays, and fusible links as per the requirement. Fuses should always be examined with the circuit loaded to avoid a misdiagnosis.
• You might suspect a faulty controller or a controller programming error if all controller power (input) and ground circuits are intact and there is no sensor power (output) supply voltage being output from the powertrain control module (or other controller). Just keep in mind that the controller replacement might need reprogramming. Reprogrammed controllers might be available through aftermarket sources for some applications; other automobiles/controllers will need on-board reprogramming that might only be done through a dealership or some other qualified source.

Common Mistakes When Diagnosing The P06B4 Code

• Negligence in the PCM
• Wiring problems