P0298 Engine Oil Temperature Too High

P0298 Engine Oil Temperature Too High - If the actual engine oil temperature is above the model predicted temperature by more than 40°C (104°F) when the predicted oil temperature reaches 88°C (190.4°F). When monitored this code with the engine running if fuel delivery mode, battery voltage above 7.5 volts, the model predicted engine oil temperature at engine start must be below 136.4°F (58°C) to initiate the diagnostic. The diagnostic will make a determination and stop running when the predicted oil temperature reaches 88°C (190.4°F).Default action the ETC (Engine Throttle Control will illuminate).

P0298 Engine Oil Temperature Too High


Possible causes P0298 Code

  • Engine Oil.
  • Cooling system not operating to specification.
  • High resistance in the EOT signal circuit.
  • High resistance in the sensor ground circuit.
  • Engine Oil Temperature Sensor.
  • Powertrain Control Module.

Diagnose DTC P0298 Code

Step 1. Check for an active DTC
Diagnose any other Engine Oil Temperature sensor DTC before continuing. Turn the ignition off, allow the vehicle to sit with the ignition off in environment where the temperature will allow the oil temperature to cool down below the engine start model predicted temperature. Start the engine and allow it to reach normal operating conditions. With the scan tool, read DTC.

Is the DTC active or pending?

Yes, go to step 2.
No, perform the the PCM intermittent condition.

Step 2. Engine Oil/Engine mechanical

The following items should be considered before determining the cause of this DTC. Failure to do so may lead to misc diagnosis.
  • Low engine oil.
  • Engine mechanical tolerances out of specification.
  • Engine Oil pressure out of specification.
  • Engine oil meets OEM specification.
  • Deteriorated or dirty oil.
  • Engine oil contaminated (i.e coolant and fuel).
  • Cooling system not operating to specification.
Were any of the above conditions present?

Yes, repair as necessary.
No, go to step 3.

Step 3. Check for high resistance in the  EOT signal circuit


P0298 Engine Oil Temperature Too High
Example Wiring

Turn the ignition off, disconnect the engine oil temperature sensor harness connector. Disconnect the PCM harness connector. Measure the resistance of the Engine Oil Temp signal circuit between the Engine oil temperature sensor harness connector and the PCM harness connector.

Is the resistance below 3.0 Ohms?

Yes, go to step 4.
No, repair the engine oil temperature signal circuit for high resistance.

Step 4. Check for high resistance in the sensor ground circuit
Measure the resistance of the sensor ground circuit between the engine oil temperature sensor harness connector and the PCM harness connector.

Is the resistance below 3.0 Ohms?

Yes, go to step 5.
No, repair the sensor ground circuit for high resistance.

Step 5. Engine Oil Temperature sensor
Turn the ignition off, reconnect the PCM harness connector. Turn the ignition on, with the scan tool, read the Oil Temperature sensor voltage. The sensor voltage should be 0.0 volts (plus or minus 1 volts) with the jumper in place.

Does the scan tool display the voltage as described above?

Yes, verify that there is good pin to terminal contact in the EOT sensor and Control Module connectors. Replace the Engine Oil Temperature sensor if no problems were found with the connectors.

No, go to step 6.

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