P0938 Code - Hydraulic Oil Temperature Sensor Range/Performance
Quick Answer
The P0938 diagnostic trouble code (DTC) indicates a problem with the hydraulic oil temperature sensor's range or performance. Common causes include Faulty Hydraulic Oil Temperature Sensor: The sensor itself may be defective or failing, causing inaccurate temperature readings, Wiring or Connector Issues: Damaged or corroded wiring or connectors can disrupt the signal between the sensor and the TCM, triggering the P0938 DTC, Malfunctioning Transmission Control Module (TCM): A problem with the TCM that processes the sensor's data can lead to the code being triggered. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0938 indicates Hydraulic Oil Temperature Sensor Range/Performance.
- Common causes
- Common causes include Faulty Hydraulic Oil Temperature Sensor: The sensor itself may be defective or failing, causing inaccurate temperature readings, Wiring or Connector Issues: Damaged or corroded wiring or connectors can disrupt the signal between the sensor and the TCM, triggering the P0938 DTC, Malfunctioning Transmission Control Module (TCM): A problem with the TCM that processes the sensor's data can lead to the code being triggered.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code P0938 Description
The P0938 diagnostic trouble code (DTC) indicates a problem with the hydraulic oil temperature sensor's range or performance. The hydraulic oil temperature sensor is a component in the vehicle's transmission system that monitors the temperature of the hydraulic fluid. This information is crucial for ensuring optimal performance and preventing damage to the transmission system.
Common Causes of P0938
- Faulty Hydraulic Oil Temperature Sensor: The sensor itself may be defective or failing, causing inaccurate temperature readings.
- Wiring or Connector Issues: Damaged or corroded wiring or connectors can disrupt the signal between the sensor and the TCM, triggering the P0938 DTC.
- Malfunctioning Transmission Control Module (TCM): A problem with the TCM that processes the sensor's data can lead to the code being triggered.
- Hydraulic Fluid Contamination: Contaminated or degraded hydraulic fluid can affect the sensor's readings and cause performance issues.
Symptoms of P0938
- Check Engine Light: The most common symptom associated with the P0938 DTC is the illumination of the check engine light on the vehicle's dashboard.
- Transmission Overheating: If the hydraulic oil temperature sensor is not providing accurate readings, the transmission may overheat, leading to issues such as slipping gears or difficulty shifting.
- Poor Transmission Performance: A malfunctioning hydraulic oil temperature sensor can result in poor transmission performance, including rough shifting, delayed engagement, or erratic behavior.
- Reduced Fuel Efficiency: A faulty sensor can impact the transmission's efficiency, potentially leading to decreased fuel economy as a result.
How to Fix P0938
- Diagnostic Scan: Begin by using a diagnostic scan tool to retrieve the specific DTCs present in the vehicle's computer system, including the P0938 code.
- Inspect Sensor and Wiring: Check the hydraulic oil temperature sensor for any visible damage or signs of malfunction, as well as inspecting the wiring and connectors for any issues.
- Replace Sensor: If the sensor is found to be faulty, replace it with a new, OEM-quality sensor to ensure accurate temperature readings.
- Clear DTCs: After replacing the sensor, clear the DTCs from the vehicle's computer system using the diagnostic scan tool to reset the check engine light.
- Test Drive: Take the vehicle for a test drive to ensure that the transmission is operating properly and that the P0938 DTC does not reappear.
Cost to Fix P0938
The typical repair costs for addressing the P0938 DTC can vary depending on the specific cause of the issue and the vehicle's make and model. In general, the cost of replacing a faulty hydraulic oil temperature sensor ranges from $100 to $300, including parts and labor. Additional costs may be incurred if wiring repairs or TCM replacement are required. It's important to note that the diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate based on your vehicle and location.
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Code P0938 Information for Specific Makes
- P0938 Dodge — Hydraulic Oil Temperature Sensor Range/Performance
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