P0937
UniversalThe Powertrain Control Module (PCM) detects an incorrect electrical signal from the hydraulic oil temperature sensor circuit.
Medium SeverityThis code indicates an electrical problem within the hydraulic oil temperature sensor circuit, meaning the vehicle's computer isn't receiving accurate temperature data for its hydraulic system, often the transmission. This can lead to improper shifting, reduced fuel economy, or potential damage to the transmission if not addressed.
⚠️ Before You Begin (Safety First)
Always allow the engine and transmission to cool before working on any components. Disconnect the battery before performing any electrical work. Be cautious of hot fluids and moving parts.
Common Symptoms
- Check Engine Light illuminated
- Transmission shifting issues (harsh, delayed, or erratic shifts)
- Transmission overheating
- Reduced fuel economy
- Transmission in 'limp mode'
Common Causes
- Faulty hydraulic oil temperature sensor
- Corroded or damaged wiring/connectors in the sensor circuit
- Short to voltage or ground in the circuit
- Open circuit
- Faulty Powertrain Control Module (PCM)
Frequently reported on: Ford F-150 (2009-2014), Dodge Ram 1500 (2007-2013), Chevrolet Silverado (2008-2014), Honda Civic (2006-2015), Nissan Altima (2007-2012)
Diagnostic Steps
- Visually inspect the hydraulic oil temperature sensor and its wiring harness for any signs of damage, corrosion, or loose connections.
- Check the transmission fluid level and condition; low or dirty fluid can indirectly cause issues.
- Using a multimeter, test the resistance of the sensor and check for continuity and proper voltage in the sensor circuit according to manufacturer specifications.
- If the sensor or wiring is found faulty, replace the defective component.
- Clear the code and test drive the vehicle to confirm the repair.
👨🔧 When to Call a Professional
If you lack experience with electrical diagnostics or transmission components, or if the code persists after basic checks, it's best to consult a professional mechanic to prevent further damage.
Commonly Asked Questions
What is a hydraulic oil temperature sensor?
It's a sensor that measures the temperature of the transmission or hydraulic system fluid, providing data to the vehicle's computer to manage shifting and system operation.
Can I drive with a P0937 code?
It's not recommended to drive for extended periods. The transmission may not shift correctly or could overheat, potentially leading to costly damage if the problem isn't addressed.
Is this sensor part of the transmission valve body?
Often, yes. In many automatic transmissions, the temperature sensor is integrated into the valve body or the transmission pan itself, making replacement more involved.
How can I test the hydraulic oil temperature sensor?
You can test its resistance with a multimeter and compare it to the manufacturer's specifications at different temperatures. You'll typically need to access the sensor connector.
Could low transmission fluid cause this code?
While low fluid won't directly cause a circuit fault, it can lead to overheating, which might make the PCM question the sensor's readings, or cause other transmission issues.