P0726 OBD Error Code: Problem & Solutions

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The fault code P0726 would mean that the car’s computer has received an incorrect, irrational or erratic engine speed signal from the engine speed input circuit. Due of this, the transmission won’t shift properly

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. The error code P0726 can be identified as Engine Speed Input Circuit Range/Performance.

What causes this problem with the Engine Speed Input Circuit Range/Performance?

• There can be some flaws in the mechanical transmission
• Excessive metal deposits on the magnetic tip of the sensor
• Malfunctioning engine speed input sensor or transmission output speed sensor
• The wiring and/or connectors in the engine speed input circuit might be opened or shorted
• Some quirks in the engine speed sensor reluctor ring

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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 P0726 here:

Common Symptoms

• Failure in transmission shifting or it might shift erratically
• Defective tachometer
• Transmission slippage or detained engagement
• Inoperative or irregular speedometer/odometer
• Issue of automatic transmissions shifting harshly

Looking out for some ways with the help of which you can correct this fault code? Then you have arrived at the correct place. We are here to help you out, so you must check out the steps mentioned below as follows:

• Carefully replace the defective engine speed sensor reluctor ring
• Make sure to replace the faulty mechanical transmission
• If there are some faults in the engine speed input sensor or transmission output speed sensor, then it should be replaced
• The malfunctioning powertrain control module should be replaced properly
• You can always replace the quirky turbocharger

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

• First of all, the mechanic should read the codes stored in the computer using an OBD II scanner. Often, the P0726 code is stored with other codes relating to the problem, which can help move the diagnosis along.
• Now once the code has been checked, it should be cleared and the vehicle should be taken out for a test drive to see if the code will reset, and to test for operating problems.
• After that the mechanic should inspect the wiring and connector leading to the engine speed input sensor and the sensor’s circuit.
• Defective wires should be replaced or repaired and any corrosion should be cleaned. Loose connections should be repaired, and then the vehicle should be tested again.
• If a test drive results in recording, the mechanic should inspect for reference voltage at the input speed sensor.
• Continuity as well as resistance should be inspected in both circuits. If the sensor fails these tests, it should be restored.

Common Mistakes When Diagnosing The P0726 Code

• Powertrain control module might have some defects
• Flaws in the transmission control module
• Issues related to car wiring
• Failure in the crankshaft position sensor