P0718
PowertrainTransmissionmoderate severityTransmission Fluid Temperature Sensor Circuit Intermittent
What P0718 Means
The transmission fluid temperature sensor is giving intermittent or erratic readings. The computer relies on this value to set shift and lockup strategy.
Symptoms
- Inconsistent shift quality
- Delayed torque converter lockup
- Overheat warning appears randomly
Common Causes
- Poor connector contact
- Damaged wiring harness
- Faulty fluid temp sensor
- Internal TCM fault
Diagnostic Steps
- Retrieve codes and freeze frame data
- Monitor temp sensor for signal dropouts
- Wiggle-test harness and connector
- Replace sensor if reading is intermittent
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Any of these will read and clear this code — pick by how deep you want to go.
Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
✓ ANCEL official store
Serious DIY~$100
BlueDriver Pro →
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Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
✓ Autel official store
Pro diagnostics$1,500+
Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
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