P2D91: Engine Oil Pressure Sensor/Switch C Range/Performance

The ECM detects a range/performance fault on the engine oil pressure sensor/switch c. Reading cannot be used reliably for control.

High severity. Can I keep driving?If the red oil warning light comes on, stop the car in a safe place and turn off the engine. Do not continue until you have confirmed the level and pressure.

Most likely causes

Sensor characteristic drifted
Sensor mounting displaced
Sensor element aged beyond calibration window

What to check, in order

Start with the simplest. You can tick off each step.

Stop and check the level with the dipstick or the car's menu
Compare the reading with other engine data while varying the engine speed.
Check for leaks and inspect the sensor's connector
Measure the actual pressure with a gauge
Check the valve or pump according to the manual

Good to know

Repair difficulty: easy
It can trigger limp mode.

What each character of P2D91 means

P: Powertrain: engine and transmission
2: Generic code: same on every make
D: Subsystem depends on the code range
91: Specific fault in that system

Frequently asked questions

Can I keep driving with code P2D91?

If the red oil warning light comes on, stop the car in a safe place and turn off the engine. Do not continue until you have confirmed the level and pressure.

What causes code P2D91?

The most common causes are: sensor characteristic drifted; sensor mounting displaced; sensor element aged beyond calibration window.

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.