Code Definition

P1C5F — Oil Viscosity Sensor Circuit Low

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Jeep

About P1C5F

P1C5F is a manufacturer-specific powertrain diagnostic trouble code recorded for Jeep vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1C5F is stored, the module has detected a signal or supply voltage lower than the expected operating range; and a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1C5F is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Powertrain Control Module (PCM) reads the oil viscosity sensor to assess engine oil condition and viscosity, and in many designs oil level and temperature, using this data for oil life monitoring and engine protection strategies. DTC P1C5F is set when the PCM detects the oil viscosity sensor signal voltage below a calibrated minimum threshold for a set period while the engine is running, which represents a circuit low condition. This is typically caused by a short to ground in the signal wire, a loss of the reference or supply voltage, or an internal sensor fault. The driver may see an oil...

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