P0195 Code - Engine Oil Temperature Sensor Malfunction

What Does P0195 Mean?

If the engine is the heart of your vehicle, then engine oil is the blood. Without engine oil to lubricate hundreds of moving metal parts, some of them separated by less than the width of a human hair, your engine would quickly overheat and weld itself into a useless chunk of metal. Engine oil, aside from lubrication, is also the principal manner in which heat is removed from the engine, which is why some oil pans have cooling fins and some engines are equipped with oil coolers. Some applications, such as towing or racing, require the installation of auxiliary oil coolers to maintain proper lubrication, cooling, and engine function.



Engine Oil Temperature and Pressure

Oil temperature is important because excessive temperature could lead to burning, engine overheating, and loss of lubrication. The engine control module (ECM) uses the engine oil temperature (EOT) sensor to monitor oil temperature. The EOT signal is also utilized by the instrument cluster if the vehicle is equipped with an oil temperature gauge or oil temperature warning light. If the ECM detects a problem with the EOT signal, it will set a diagnostic trouble code (DTC) in system memory and illuminate the malfunction indicator lamp (MIL).

For example, if the engine has been off for a few hours at engine startup, the ECM assumes that the EOT should measure about the same as the IAT and ECT (intake air temperature and engine coolant temperature) sensors. If EOT readings are off by more than a few degrees, the ECM assumes a fault in the EOT or its circuit. After the engine has started, it monitors EOT and estimates how warm the oil should be heating up within a certain amount of time. If measured oil temperature doesn’t rise above a certain threshold within that time limit, the ECM assumes a fault. DTC P0195 is defined as “Engine Oil Temperature (EOT) Sensor Circuit Error.”

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What are the common causes of P0195 ?

Typical causes of engine overheating are low engine coolant levels, faulty cooling fan/s, a blown or cracked cylinder head/s, a faulty radiator, or a faulty thermostat. This code could also be triggered by a faulty coolant temperature sensor, shorted or open electrical circuitry, or a bad PCM but the former scenarios rarely occur.

How do you troubleshoot P0195 ?

There are currently two main types of cylinder deactivation used today, depending on the type of engine. P0195 code for the pushrod design which uses solenoids to alter the oil pressure delivered to the lifters. In their collapsed state, the lifters are unable to elevate their companion pushrods under the valve rocker arms, resulting in valves that cannot be actuated and remain closed.

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