P071E OBD Error Code: Problem & Solutions

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It is the engine control module which gives an illumination in the malfunction indicator lamp when a P071E trouble code triggers up. The P071E transmission mode switch B circuit code would trigger up when the ECM (Engine Control Module) and/or the TCM will detect a general fault in the "B" transmission mode switch or the circuit.

All the sensors as well as switches which are involved in the operation of the transmission are monitored by the transmission control module. These days the automatic transmissions provide a lot more comforts which were not there before. The cruise control is controlled and at the same time monitored by the TCM.

The trouble code P071E can be defined as Transmission Mode Switch "B" Circuit Low.

What causes this problem with the Transmission Mode Switch "B" Circuit Low?

• Faults in the wiring
• Malfunctioning shift lever transmission control module issue
• Faulty mode switch
• High resistance can be caused because of corrosion
• Inaccurate fuse/box

1. Electronic Control Unit - A defective Electronic Control Unit can cause a lot of issues. It would be nice if you get it replaced on time.
2. Powertrain Control Module - There can be some issues with the Powertrain Control Module due to which you may see P071E code appearing over and over again. Visit us to buy best quality PCM online.
3. Auto Transmission Control Module - Are you facing some faults in your Auto Transmission Control Module? Don’t worry and get them replaced or else P071E code can turn up.
4. Engine Control Module - Common cause behind this P071E error code can be some fault in Engine Control Module. So, it will be a good decision to replace them now.
5. Body Control Module Component - Timing Chain is perfectly fine but still but having that trouble code P071E flashing? In such a situation your Body Control Module Component might be faulty. Why don’t you think of getting that replaced?

It is essential 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 P071E here:

Common Symptoms

• Issue of not downshifting when torque is needed
• Shift pattern might be incapable
• Decreasing power under heavy load/towing
• Mode switch might be inoperative
• Issue of erratic or abnormal switch operation

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P071E:

• The defective engine control module should be replaced or repaired as per the need
• Restore the faulty electronic control unit
• If you find out that there are some faults in the body control module component, then it should be replaced
• The malfunctioning powertrain control module should be repaired
• Make sure that you get the auto transmission control module replaced

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If you want to easily diagnose this trouble code, then you must follow the steps which are mentioned here as below:

Just keep in mind that the initial start point would surely be different as it all depends upon what tools/references you have at your disposal

If your scanner has any monitoring capabilities, you may be able to monitor the values and/or operation of your particular mode switch.

If it is so, then you should toggle the switch on and off to see if your scanner recognizes your inputs. There may be a lag here so a few seconds delay would be a good idea when the switches are being monitored.

But if you find the mode switch is not functioning properly according to your scanner, you may be able to jump some pins at the mode switch connector to rule out the circuit.

If the circuit is ruled out in this manner, and the switch is still inoperative, then move on to testing the switch itself.

These are general guidelines but with a moderately able scan tool, troubleshooting CAN be pain-free if you know what you're looking for.

You can always refer to the service manual for specs/procedures.

Then you should test the switch. Many a times these switches are just to signal to the appropriate modules (e.g. TCM, BCM (Body Control Module), ECM, etc.) your towing/load needs so it can implement modified shift patterns.

A lot of these are on/off style. This means, that a simple continuity test with an ohmmeter can determine the functionality of the sensor.

Now, these sensors are sometime incorporated into the shift lever so make sure to research which connectors/pins you need to monitor with your multimeter.