What Does P0937 Mean?
DTC P0937 is a general circuit malfunction code for the hydraulic oil temperature sensor. The TCM has detected that the sensor signal is outside the expected voltage range or the circuit has failed self-test diagnostics. Hydraulic oil temperature is critical for transmission operation because fluid viscosity changes significantly with temperature, affecting shift quality and clutch actuation pressure.
Common Causes
30%
Faulty hydraulic oil temperature sensor (open or shorted internally)
25%
Wiring harness damage (open circuit, short to ground, or short to power)
20%
Corroded or water-damaged sensor connector
15%
Poor ground connection at the sensor or TCM
10%
TCM internal circuit failure affecting the temperature sensor input
Diagnostic Steps
1
Step 1: Check the hydraulic oil temperature sensor connector for corrosion, bent pins, or moisture intrusion. Clean and reseat the connector if needed.
2
Step 2: Measure the sensor resistance with a multimeter at ambient temperature and compare to the manufacturer's resistance-vs-temperature chart. Most NTC sensors read 2-4k ohms at room temperature.
3
Step 3: Verify wiring continuity from the sensor connector to the TCM pins. Check for shorts to ground and shorts to power on both signal and ground wires.
4
Step 4: With the scan tool, monitor the reported hydraulic oil temperature value. If it reads a fixed extreme value (-40F or 300F+), the circuit is likely open or shorted respectively.
5
Step 5: Replace the hydraulic oil temperature sensor if it does not meet resistance specifications. Clear codes and verify the temperature reading changes appropriately as the transmission warms up.
Estimated Repair Cost
$120 - $400
Parts + labor, varies by vehicle and location
DTC P0937 is a general circuit malfunction code for the hydraulic oil temperature sensor. The TCM has detected that the sensor signal is outside the expected voltage range or the circuit has failed self-test diagnostics. Hydraulic oil temperature is critical for transmission operation because fluid ...
The most common cause of P0937 (Hydraulic Oil Temperature Sensor Circuit) is: Faulty hydraulic oil temperature sensor (open or shorted internally)
Typical repair costs for P0937 range from $120 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Without accurate hydraulic oil temperature data, the TCM cannot properly adjust shift pressure and timing for fluid viscosity. This may result in harsh cold shifts, clutch slippage when hot, or premature transmission wear. Driving is generally safe short-term but should be addressed to prevent long-term damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0937 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission / Clutch Hydraulic System
Difficulty
Type
Generic (SAE)
Recommended Tools
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