The P0726: Engine Speed Input Circuit Range/Performance refers to an issue with the engine speed input circuit. This circuit monitors the engine’s rotational speed (RPM) and provides data to the transmission control module (TCM) for proper shifting and transmission operation. A problem in this circuit can cause transmission performance issues. The cause may be a faulty sensor, wiring problems, or a circuit issue.
P0726 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0726: Engine Speed Input Circuit Range/Performance |
| Is it serious? | Yes, as improper engine speed readings can lead to transmission shifting problems and poor performance. |
| Possible causes | – Range or performance issue with engine speed input circuit – Faulty sensor or circuit – Wiring issues |
| How to diagnose? | – Test the circuit for range and performance – Inspect wiring and connectors – Replace faulty components if needed |
P0726 Meaning
The P0726 code is triggered when the engine speed input circuit is not providing the expected range or performance data to the TCM. This sensor monitors engine speed, which is crucial for smooth transmission shifting. If the sensor provides incorrect data or fails, it can result in improper transmission function, affecting vehicle drivability.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for additional transmission or engine-related codes, which may provide further diagnostic information. | OBD-II Scanner |
| Test the Engine Speed Input Circuit for Range and Performance | Use a multimeter or diagnostic tool to measure the engine speed sensor’s signal and performance. Compare the readings with manufacturer specifications to ensure the circuit is operating within the correct range. | Multimeter, Diagnostic Tool |
| Inspect Wiring and Connectors | Inspect the wiring and connectors for damage, corrosion, or loose connections that could affect the engine speed input circuit’s performance. | Flashlight, Multimeter |
| Inspect the Engine Speed Sensor | Check the engine speed sensor for proper alignment and physical condition. If the sensor is misaligned or damaged, it may affect the circuit’s performance. | Basic Tools |
| Replace Faulty Components if Necessary | If the engine speed sensor or other related components are found to be faulty, replace them to restore proper circuit function. | Replacement Parts, Standard Tools |
| Clear Code and Retest | After repairs, clear the P0726 code using an OBD-II scanner and test the vehicle to ensure the issue is resolved. | OBD-II Scanner |
| Recheck for Codes | After the test drive, re-scan the vehicle to ensure the P0726 code has not returned. | OBD-II Scanner |
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