P2D90: Engine Oil Pressure Sensor/Switch C Circuit High

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

Most likely causes

• Signal wire shorted to B+
• Open sensor
• Connector pins corroded - high contact resistance

What to check, in order

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

1. Stop and check the level with the dipstick or the car's menu
2. Check the sensor's ground and make sure the signal wire is not receiving voltage from another circuit.
3. Check for leaks and inspect the sensor's connector
4. Measure the actual pressure with a gauge
5. Check the valve or pump according to the manual

Good to know

• Repair difficulty: easy
• It can trigger limp mode.

What each character of P2D90 means

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

Frequently asked questions

Can I keep driving with code P2D90?

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 P2D90?

The most common causes are: signal wire shorted to B+; open sensor; connector pins corroded - high contact resistance.

Sources

• github.com: dtc database
• en.wikipedia.org: Engine oil pressure sensor

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.