P0942 on 2011-2019 Fiat Uno — Hydraulic Pressure Unit Loss of Pressure
1 vehicles · 1 makes · $350-$1,200 repair
Most Reported On
P0942 is an OBD-II diagnostic trouble code meaning “Hydraulic Pressure Unit Loss of Pressure.” P0942 indicates the powertrain control module has detected a loss of hydraulic pressure in the transmission's hydraulic pressure unit/circuit. The hydraulic system controls clutch and band apply pressures needed for proper gear engagement, and insufficient pressure can cause harsh shifts, slipping, or failure to shift. 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 P0942, 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 P0942 mean?
P0942 stands for "Hydraulic Pressure Unit Loss of Pressure." P0942 indicates the powertrain control module has detected a loss of hydraulic pressure in the transmission's hydraulic pressure unit/circuit. The hydraulic system controls clutch and band apply pressures needed for proper gear engagement, and insufficient pressure can cause harsh shifts, slipping, or failure to shift.
What are the most common causes of P0942?
The most common causes of P0942 are: Low or degraded transmission fluid (incorrect level, contamination, or wrong fluid type), Faulty or stuck hydraulic pressure control solenoid, Failing transmission oil pump producing insufficient pressure, Internal hydraulic leaks (worn seals, valve body, or gaskets), Clogged transmission filter restricting fluid flow, Wiring or connector faults in the pressure control circuit. The specific cause varies by vehicle.
How much does it cost to fix P0942?
Repair costs for P0942 range from $350 to $1,200, depending on the vehicle and root cause.
Which vehicles are affected by P0942?
Au7o has documented P0942 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.