Trans Temp Sensor Circuit Open or Shorted to Pwr or Gnd
Your transmission temperature sensor has a broken wire or is shorted to power/ground, like a phone charger with a damaged cable that won't communicate properly. The ECU can't read how hot the transmission fluid is, so it can't protect the transmission from overheating.
The ECU monitors the transmission temperature sensor voltage, expecting a variable signal between 0.5V and 4.5V that corresponds to fluid temperature. An open circuit reads as 5V (shorted to power) or 0V (shorted to ground/open), triggering a fault since these voltages are outside normal operating range.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Sensor Voltage | 0.5V - 4.5V (proportional to temp) | <0.1V or >4.8V (open/shorted) |
| Temperature Signal | -40°C to 150°C | Out of range or no signal |
Code P1914 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P1914 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.