The P0940: Hydraulic Oil Temperature Sensor Circuit High refers to an issue where the hydraulic oil temperature sensor circuit is receiving higher than expected voltage. This can cause incorrect temperature readings, potentially leading to transmission performance issues.
P0940 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0940: Hydraulic Oil Temperature Sensor Circuit High |
| Is it serious? | Yes, as high voltage can result in inaccurate temperature readings, affecting the transmission’s performance. |
| Possible causes | – High voltage in the hydraulic oil temperature sensor circuit – Faulty hydraulic oil temperature sensor – Wiring or connector issues |
| How to diagnose? | – Check the circuit for high voltage – Inspect wiring and connectors – Replace the hydraulic oil temperature sensor if necessary |
P0940 Meaning
The P0940: Hydraulic Oil Temperature Sensor Circuit High code indicates that the voltage in the hydraulic oil temperature sensor circuit is above the required level, leading to inaccurate readings. This can negatively impact the transmission’s operation by providing incorrect temperature data for hydraulic fluid management.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for additional fault codes that could provide more details about the issue. | OBD-II Scanner |
| Inspect the Wiring and Connectors | Visually inspect the wiring and connectors related to the hydraulic oil temperature sensor for damage, corrosion, or disconnections. | Flashlight, Multimeter |
| Test for High Voltage | Use a multimeter to test the voltage in the hydraulic oil temperature sensor circuit. Compare it with the manufacturer’s specified voltage range. | Multimeter |
| Check the Hydraulic Oil Temperature Sensor | Test the hydraulic oil temperature sensor for proper functionality. Replace it if it is providing faulty readings or high voltage output. | Diagnostic Tool, Replacement Sensor |
| Clear the Code and Test Drive | After repairs, clear the code using an OBD-II scanner and take the vehicle for a test drive to confirm that the issue is resolved. | OBD-II Scanner, Vehicle Owner’s Manual |
| Recheck for Codes | Re-scan the system to ensure the P0940 code does not reappear after the test drive. | OBD-II Scanner |
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I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko