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P0726 is a diagnostic trouble code (DTC) for "Engine Speed Input Circuit Range/Performance". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $114.99 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.0 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
The P0726 code means that the car’s computer has received an incorrect, irrational or erratic engine speed signal from the engine speed input circuit. Because of this, the transmission will not be able to shift correctly.
The P0726 code is related to other similar codes dealing with the crankshaft position sensor and engine speed input circuit. Essentially, the car’s computer is receiving an incorrect signal from the engine speed input circuit. This signal might be erratic, outright incorrect, or irrational. The upshot is that the transmission cannot provide a shifting strategy because the computer is unable to determine the actual speed of the engine. The computer expects the engine speed to increase gradually, and if that does not happen, whether actual or due to a faulty signal, the P0726 code will be stored.
There are multiple potential causes for the P0726 code. These can include:
A range of different symptoms could be present with the P0726 code. These can include the following:
First, 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. After checking the code, it should be cleared and the vehicle test driven to see if the code will reset, and to test for operating problems.
Next, the mechanic should inspect the wiring and connector leading to the engine speed input sensor and the sensor’s circuit. Damaged 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 recoding, the mechanic should check for reference voltage at the input speed sensor. Continuity and resistance should be checked in both circuits. If the sensor fails these tests, it should be replaced.
The most common mistake here is assuming that the problem is the vehicle speed sensor and replacing it without further diagnosis. Other incorrect assumptions (made without a full diagnosis) include a problem with the fuel delivery system, a transmission failure or driveline problem.
The P0726 code is serious, and should be diagnosed immediately. It can result in serious drivability problems, up to and including the engine stalling while slowing to a stop in traffic. This can lead to accidents that could have been avoided. There is also the potential for damage to the transmission if it fails to shift correctly, or at all.
The most common repair is the replacement of the engine speed input sensor, although corrosion and damage to connectors, wires and wiring harnesses are also common repairs needed. Replacing a defective transmission output speed sensor is also a common repair.
Note that the Check Engine Light will not come on in all instances.
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