Oil Pressure Sensor Voltage Low
The oil pressure sensor is reporting a low voltage condition.
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What it means (plain English)
The oil pressure sensor is sending a voltage below 0.2 volts to the engine control module (ECM), which signals a problem. Normally this sensor should see between 0.5 to 4.5 volts, depending on oil pressure.
What the computer is actually seeing
The ECM looks for a specific voltage range from the oil pressure sensor. If it detects a voltage below a predetermined threshold (around 0.2 volts), it triggers this fault code.
What a healthy reading looks like
The oil pressure sensor output should be between 0.5 volts (low pressure) and 4.5 volts (high pressure).
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 1Check the oil level. Ensure it is at the correct level as low oil can cause sensor issues.
- 2Inspect wiring and connectors of the oil pressure sensor for damage or corrosion. Repair as needed.
- 3Use a multimeter to measure the voltage at the oil pressure sensor. Compare it to expected values (0.5-4.5 volts). If below 0.2 volts, suspect the sensor.
- 4If the sensor voltage is fine, check for engine oil quality. Change oil if necessary (wrong viscosity can cause incorrect readings).
Common causes
- Faulty oil pressure sensor
- Wiring issues (shorts or breaks)
- Bad engine oil (wrong viscosity or low level)
- Faulty ECM or incorrect programming
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not advisable to drive if your oil pressure is genuinely low as it can cause serious engine damage.
Will this code come back after I clear it?
If the root cause isn't fixed, it will likely return.
Why does this code sometimes appear with SPN 4136?
SPN 4136 is often related to similar issues with oil pressure sensing, so they can trigger together.
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