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P071A OBD Error Code: Problem & Solutions

OBD Code P071A - Transmission Mode Switch "A" Circuit

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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 P071A can be defined as Transmission Mode Switch "A" Circuit

Learn More About OBD Error Code P071A

It is the engine control module which gives an illumination in the malfunction indicator lamp when a P071A trouble code triggers up. The P071A transmission mode switch A circuit code would trigger up when the ECM (Engine Control Module) and/or the TCM will detect a general fault in the "A" transmission mode switch or the circuit.

 

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

 

  • There can be some defects in the mode switch
  • Corrosion caused because of high resistance
  • Issue of frayed, open, short to power, short to ground, etc wiring
  • Faulty shift lever transmission control module issue
  • Inaccurate fuse/box

Replace/Repair These Parts To Fix Code P071A

  1. Body Control Module Component - Did your mechanic just found out that there is some fault in the Body Control Module Component? Buy top notch Body Control Module Component from us at economical prices.
  2. Auto Transmission Control Module - A broken Auto Transmission Control Module can cause a lot of issues. It would be nice if you get it replaced on time.
  3. Engine Control Module - Everything is fine with the Auto Transmission Control Module and still OBD code P071A flashing? Then there is definitely some fault with the Engine Control Module. Get it checked and replace if needed.
  4. Electronic Control Unit - Electronic Control Unit is an important car part which should never be neglected. May be there is some fault in it due to which P071A code may start flashing.
  5. Powertrain Control Module - A faulty Powertrain Control Module can be troublesome. You can always rely on us as we have best auto parts for our customers.

Symptoms Of OBD Error Code P071A

Our main motive is to achieve customer satisfaction as for us our customers are everything and that’s why we will help you to diagnose P071A code by mentioning some major symptoms below:

 

Common Symptoms

 

  • Mode switch might be inoperative
  • Issue of erratic or abnormal switch operation
  • Incompetent shift pattern
  • There can be less power under heavy load/towing
  • Not downshifting when torque is needed

How To Correct P071A Transmission Mode Switch "A" Circuit

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 P071A:

 

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

However, if you face any issue then we have stocked a wide range of best priced Tcm, Multimeter, Code Scanner, Bcm, Fuse Box, Obd Reader, Car Diagnostic Tool, Car Scanner, Obd2 Car Scanner, Fuse Block, Bluetooth Obd2 Reader, Automotive Code Reader and more to help you out in fixing your car.

Easy Diagnosis Of Engine Error OBD Code P071A

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

 

Your starting point would always depend upon what tools as well as references you have at the 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.

Other Diagnostic Codes Related To OBD Code P071A

P071B - Transmission Mode Switch "A" Circuit Low

P071C - Transmission Mode Switch "A" Circuit High