P0938
PowertrainTransmission Pressuremoderate severityHydraulic Oil Temperature Sensor Circuit Range/Performance
What P0938 Means
The hydraulic oil temperature sensor reading is out of its expected range. This often indicates a sensor drift or wiring issue.
Symptoms
- Inaccurate temperature readings
- Transmission warning light on
- Poor shift quality
Common Causes
- Faulty oil temperature sensor
- Wiring or connector faults
- Contaminated transmission fluid
- Control module fault
Diagnostic Steps
- Read codes and freeze frame data
- Compare sensor reading to actual temperature
- Inspect wiring and connectors
- Test sensor resistance values
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Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
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Serious DIY~$100
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Autel MaxiCOM MK808S →
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✓ Autel official store
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Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
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