P0712 code: Transmission Fluid Temperature Sensor Circuit Low
P0712 means transmission Fluid Temperature Sensor Circuit Low. The code says where to look, not what failed — the fix depends on which cause your car actually has.
What P0712 means
P0712 means the voltage on the transmission fluid temperature sensor circuit has dropped below its valid range — typically a short to ground. Because of how these sensors work, a shorted-low circuit reads as impossibly hot fluid: the computer may see maximum temperature seconds after a cold start, which is physically impossible. This is an electrical fault, not genuinely overheating fluid — that distinction is the whole diagnosis. The side effect is that the computer may believe the fluid is scorching and switch into hot-mode protection: early converter lockup, altered shift points, sometimes a transmission temperature warning on the dash. Causes are a shorted sensor, chafed wiring grounding out, or a pinched internal harness.
P0712 symptoms
- Transmission temperature warning or gauge pegged hot when the car is cold
- Early or aggressive torque-converter lockup
- Altered shift feel from hot-mode strategy
- Check-engine light
What it costs to fix P0712
Typical range: $60–$450 · about ~0.3–2 hrs of labor
| If the cause is… | Part | Labor |
|---|---|---|
| Fluid temperature sensor | $30–$150 | ~0.3–2 hrs |
| Wiring / connector repair | $10–$120 | ~0.5–1.5 hrs |
A shorted circuit is a straightforward electrical diagnosis. The cost question is where the short lives: external wiring is cheap to repair, while a sensor built into the internal harness means the pan comes off, adding labor.
The price swings on which cause it turns out to be — so confirm the cause before paying. Diagnose P0712 for my exact vehicle →
How to fix P0712
Moderate — doable at home with common tools and patience
- Make sure the fluid isn't genuinely overheating
P0712 means the circuit reads impossibly hot, but real overheating from low fluid, towing, or a blocked cooler has to be ruled out first. If the code sets on a cold start with the pan still cool to the touch, the heat is electrical. If the pan is scorching and the fluid is low or smells burnt, stop and deal with that before anything else.
- Unplug the case connector and watch the reading
With the key on and the scan tool showing fluid temperature, disconnect the transmission's main connector (expect a few extra codes to clear later). An open circuit should swing the reading to the coldest value it can display. If it does, the short is inside the transmission; if it still reads hot, the fault lies in the vehicle wiring between the connector and the module.
- Hunt for a chafed wire touching ground
Trace the harness under the car for spots rubbed through against the crossmember, case bolts, or a sagging exhaust. With both the module and transmission unplugged, a meter between the TFT signal wire and chassis ground should read open; any continuity confirms the short, and the bare spot is usually close to a clip or bracket.
- Ohm the sensor through the case connector
Measure across the two TFT pins on the transmission side of the connector and compare with the service manual's resistance-versus-temperature chart. On a cold transmission, a reading far below the chart value — or continuity from either pin to the case — points at a shorted sensor or an internal lead crushed under the pan or a valve-body bolt.
- Fix the short, then confirm the reading starts cold
Repair the external wire or replace the sensor or internal harness, rerouting carefully so the new lead can't be pinched again. Clear the code, let the car sit until fully cold, and check that the reading now begins near ambient and climbs gradually with driving — a sensible starting value is the proof the short is gone.
DIY or shop? A home mechanic with a meter can run the whole diagnosis here: the unplug test alone tells you whether to look under the car or inside the transmission. Repairing an external chafed wire is straightforward solder-and-heat-shrink work. If the short is internal, it is a pan-drop job with a messy refill — doable at home on level ground with the correct fluid — but on units where the temperature sensor is integrated into a control module or solenoid body, the replacement may need programming and belongs at a shop.
Tools for the DIY steps: Scan tool with fluid temperature reading · Digital multimeter · Wiring diagram · Wire repair kit with heat-shrink · Drain pan and specified fluid
Not sure which step applies to your car? Get the likely cause for your exact vehicle before buying anything for P0712.
Start a case with P0712 and your car. Redline weighs these causes against what your car shows, and names the check that would settle it before you buy parts.
Can I drive with P0712?
Redline can’t determine from a symptom or code alone whether your car is safe to drive.
P0712: common questions
My dash says the transmission is overheating — is it really?
With P0712, probably not. This code means the circuit voltage is impossibly low, which the computer interprets as extreme heat — even on a cold morning, which is the giveaway. Confirm with a scan tool: if it reads maximum temperature at startup, it's electrical, not thermal.
What's the difference between P0712 and P0713?
They're electrical opposites. P0712 is the circuit shorted low, which reads as falsely hot; P0713 is the circuit open or high, which reads as falsely cold. Both are wiring-or-sensor problems, but the direction tells the technician what kind of fault to hunt for.
Can I drive with P0712?
A code can't settle that on its own. The transmission isn't actually hot, and the fault is electrical. The trade-off is odd shift behavior from hot-mode strategy and losing your real overheat warning, so it's worth fixing promptly rather than living with. If you smell hot fluid or feel slipping, stop driving and get it checked.
Could low fluid cause P0712?
Not directly — a circuit-low code is a short, not a fluid problem. Still, check the fluid while you're there: it takes two minutes, and if the internal harness has to come out anyway, a fluid and filter service at the same time is smart maintenance.
Related trouble codes
Don’t have a scanner yet? A ~$25 Bluetooth adapter reads codes like P0712 from your phone. See our guide to the best OBD2 Bluetooth adapters. Run a repair shop? See Redline for shops.
Generic OBD-II reference. Manufacturer-specific behavior varies. Confirm with a scan tool and, for safety-related codes, a professional inspection. Cost ranges are reference ranges, not quotes.
Seeing P0712 on your car?
Every problem becomes a Case. Tell Redline what the car is doing: it shows what the evidence supports, what’s still missing, and what to check next, before you approve a repair.
“Inner pad ~1 mm. Outer pad 3 mm.”
Next: check the slide pins move freely before buying parts.