P0726 Code - Engine Speed Input Circuit Range/Performance

What does P0726 Mean?

The Engine Control Module (ECM) monitors the engine speed through the Crankshaft Position (CKP) sensor with the engine running, and send signal to the Transmission Control Module (TCM).

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What are the common causes of P0726 ?

• Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
• An air leak forward of the DPF will change the sensor readings resulting in the code
• Defective ECU strategies or components will prevent proper regeneration

How do you troubleshoot P0726 ?

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.

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