P0805 on Fiat: How to Diagnose & Fix
Clutch Position Sensor Circuit
1 Fiat model · 1 documented issue · 1 critical · $350-$1,200 repair
P0805 on Fiat by model: symptoms, diagnosis and fix
The single-clutch automated manual offered on the Novo Uno (Dualogic on the 1.4 Fire Evo, GSR on the 1.3 Firefly 'Uno Drive') is the model's most expensive weak point. Chronic failure modes documented by Brazilian transmission specialists include worn or mis-calibrated clutch actuators causing slipping and jerky engagement, hydraulic pressure loss from leaks (pump shuts down, codes P0942/P2712), failed gear/clutch position sensors (P0805/P0806, P0715/P0725) and TCU faults that force the transmission into emergency mode or drop it into neutral while driving. It became serious enough that in 2019 Fiat recalled 11,669 vehicles across 8 models — including 916 Uno 1.3 GSR units, model years 2017-2018 (chassis 796635 to 835113) — because the transmission could shift to neutral involuntarily, causing sudden loss of drive.
Common Symptoms
- Transmission drops into neutral by itself while driving
- Jerky or delayed gear engagement
- Clutch slipping during shifts
- Reverse gear refuses to engage
- Gearbox warning light with transmission stuck in emergency mode
How to Fix
For 2017-2018 GSR cars: confirm the official recall (replacement of the gear selector sensor, ~1 hour, free) was performed. For chronic faults: scan the TCU for stored codes first; many problems are resolved by clutch actuator recalibration or replacement and hydraulic fluid/leak service rather than full transmission replacement. Worn clutches must be replaced with actuator recalibration. Use a shop experienced with Fiat Dualogic/GSR — incorrect calibration is a common cause of repeat failures.
Sources for this issue (1)
P0805 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0805 mean on a Fiat?
P0805 stands for "Clutch Position Sensor Circuit." This generic powertrain code indicates the transmission/transaxle control module has detected a fault in the clutch position sensor circuit, meaning the signal from the clutch pedal/clutch position sensor is missing, out of range, or implausible. It is found on vehicles with a manual or automated manual transmission where the module needs to know clutch engagement to manage shifting, start enable, or cruise control. The result can be erratic shifting, disabled features, or an inability to detect when the clutch is depressed. On Fiat it is documented across 1 model: Uno.
What are the most common causes of P0805?
The most common causes of P0805 are: Faulty or worn clutch position (pedal) sensor, Damaged, corroded, or loose sensor connector and wiring, Open or short circuit in the clutch position sensor signal, ground, or reference wiring, Sensor misadjusted or out of calibration / mechanical misalignment, Failed transmission control module (TCM) or PCM. The specific cause varies by vehicle.
How much does it cost to fix P0805 on a Fiat?
Published repair estimates on Fiat range from $350 to $1,200 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0805 on a different make?
View P0805 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.