P2904 on 2011-2019 Fiat Uno — Transmission Fluid Temperature Sensor "C" Circuit Low
1 vehicles · 1 makes · $350-$1,200 repair
Most Reported On
P2904 is an OBD-II diagnostic trouble code meaning “Transmission Fluid Temperature Sensor "C" Circuit Low.” This generic powertrain code sets when the Powertrain Control Module (PCM) or Transmission Control Module (TCM) detects that the voltage signal from the "C" transmission fluid temperature (TFT) sensor circuit is lower than the expected/calibrated range. A low circuit reading typically corresponds to an implausibly high fluid temperature indication, signaling a short to ground, a sensor fault, or a wiring problem in that temperature-sensing circuit. This code is most commonly reported on 2011-2019 Fiat Uno, with repair costs ranging from $350 to $1,200.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P2904, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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FAQ
What does P2904 mean?
P2904 stands for "Transmission Fluid Temperature Sensor "C" Circuit Low." This generic powertrain code sets when the Powertrain Control Module (PCM) or Transmission Control Module (TCM) detects that the voltage signal from the "C" transmission fluid temperature (TFT) sensor circuit is lower than the expected/calibrated range. A low circuit reading typically corresponds to an implausibly high fluid temperature indication, signaling a short to ground, a sensor fault, or a wiring problem in that temperature-sensing circuit.
What are the most common causes of P2904?
The most common causes of P2904 are: Short to ground in the TFT 'C' sensor signal wiring or connector, Failed/out-of-range transmission fluid temperature sensor, Corroded, damaged, or loose sensor connector pins, Damaged wiring harness (chafed or pinched wires) in the transmission circuit, Low or contaminated transmission fluid affecting sensor readings, Faulty PCM/TCM (less common). The specific cause varies by vehicle.
How much does it cost to fix P2904?
Repair costs for P2904 range from $350 to $1,200, depending on the vehicle and root cause.
Which vehicles are affected by P2904?
Au7o has documented P2904 across 1 vehicle models from 1 manufacturers: Fiat.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.