P0726 OBD-II Trouble Code: Engine Speed Input Circuit Range/Performance

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0726 code

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. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P0726 DIAGNOSTIC Get a fair and transparent estimate upfront

P0726 code definition

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.

What the P0726 code means

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.

What causes the P0726 code?

There are multiple potential causes for the P0726 code. These can include:

  • A failed engine input speed sensor
  • A failed transmission output speed sensor
  • A short or open in the wiring harness to one of the sensors
  • A loose connection to one of the sensors
  • A faulty crankshaft position sensor
  • A faulty shift solenoid
  • Dirty, contaminated or low transmission fluid
  • Faulty PCM (rare)

What are the symptoms of the P0726 code?

A range of different symptoms could be present with the P0726 code. These can include the following:

How does a mechanic diagnose the P0726 code?

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.

Common mistakes when diagnosing the P0726 code

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.

How serious is the P0726 code?

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.

What repairs can fix the P0726 code?

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.

Additional comments for consideration regarding the P0726 code

Note that the Check Engine Light will not come on in all instances.

Need help with a P0726 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

trouble codes
P0726
Check Engine Light

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0726 code.

SCHEDULE P0726 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

4,987

Rating Summary
4,593
191
48
28
127
4,593
191
48
28
127

Robert

12 years of experience
6 reviews
Robert
12 years of experience
Ford Fusion - Check Engine Light is on - Stockton, California
Robert was very knowledgeable and professional. He is also very friendly and likable individual. I’m very pleased and satisfied with his work.

Sonal

16 years of experience
19 reviews
Sonal
16 years of experience
Mercedes-Benz S550 - Check Engine Light is on - Federal Way, Washington
Sonal was very knowledgeable and took the time to explain each of the 50 point checklist thoroughly. Sonal definitely has an abundance of Mercwdes Benz experience regarding mechanical problems.

Daniel

20 years of experience
301 reviews
Daniel
20 years of experience
Chrysler Town & Country - Check Engine Light is on - Santa Fe, Texas
Daniel was on time and performed a 50 inspection for us. We now have a path forward for repair and will be scheduling Daniel to return and make the repairs.

Michael

15 years of experience
515 reviews
Michael
15 years of experience
Chevrolet Equinox - Check Engine Light is on - Woodstock, Georgia
Mike really knows his stuff. He took alot of time with me making sure I understood what was going on with my vehicle.


Related questions

I have a Nissan Quest with several codes showing - P0075, P0882, P0726

Ok the codes you have given me look like they all may point to different problems. The P0075 points to a malfunction in the intake valve control circuit. The valve timing solenoid may be failing in this case. These valves...

More related articles

P0155 OBD-II Trouble Code: 02 Sensor Heater Circuit Malfunction (Bank 2, Sensor 1)
P0155 trouble code definition O2 Oxygen Sensor Heater Circuit Malfunction (bank 2 sensor 1) What the P0155 code means When the P0155...
P2250 OBD-II Trouble Code: O2 Sensor Ref Voltage Circuit High Bank 2 Sensor 1
P2250 means an issue with the upstream oxygen sensor voltage circuit in bank 2 due to a faulty sensor, fuel pressure, or engine or exhaust leaks.
P0242 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit High
P0242 P0242 code definition Turbocharger Boost Sensor B Circuit High What the P0242 code means P0242 is a generic OBD-II code which indicates that the engine control module (ECM) detected the intake boost pressure sensor B input circuit out of...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com