Hyundai Veloster 0523: Meanings, Causes and Most Likely Fixes

P0523, an OBD2 standard trouble code can happen in your Hyundai Veloster. In layman’s terms, it indicates the signal from the oil pressure sensor is higher than its normal operating range (in terms of voltage).

P0523 is generic (it has the same definition for all vehicles), repair steps will depend on your Veloster’s model year and the engine equipped.

The most frequent cause of P0523 is a bad oil pressure sensor. But, this could be caused by an oil system fault. Don’t assume the sensor is bad until you confirm the oil pressure manually. If there’s an oiling issue, it can cause engine damage or failure.

P0523 Definition: Engine Oil Pressure Sensor/Switch – High Input

Here’s precisely what P0523 is telling you:

Oil Pressure Sensor/Switch

The oil pressure sensor bolts into your Veloster’s engine and relays the oil pressure reading to the Powertrain Control Module (PCM). The sensor converts mechanical pressure into a voltage that is understood by the PCM.

The PCM sends the oil pressure to the oil gauge (or the warning light) from the PCM.

High input

This indicates that the voltage value is close to or higher than its maximum value. It also tells the PCM the oil pressure is high. If the input was low, you’d have P0522.

Hyundai Veloster P0523: Symptoms

Your Veloster may feel like it’s running and driving fine, but even without symptoms, you shouldn’t drive it with P0523 until you verify the oil pressure is fine.

These are some of the symptoms that most commonly occur with P0523.

• Check engine light
• A high reading of the gauge's oil pressure, or the light that indicates it could be on, can indicate excessive oil pressure.

P0523 Hyundai Veloster Reasons

It could be one of two issues. One, the oil pressure may be too high or the sensor is malfunctioning.

These are some of the more common reasons for P0523 on the Hyundai Veloster. We also have the correct order in which to inspect them.

Take a look at the oil

Verify that the oil level isn’t overly full. Are you satisfied with the oil? What is the correct weight of it? If you didn’t pour it in yourself, it’s possible that the wrong viscosity was used the last time the oil was changed. This is what you should do if P0523 appears right after an oil change.

Bad Oil Pressure Sensor – Wiring

If the oil level is correct, it’s not old, and it’s the proper viscosity, it’s time to look at your Veloster’s oil pressure sensor. These sensors are close to the exhaust and can lead to widespread wiring problems.

Examine the harness carefully for obvious damages. Look for cracked, broken, burnt, or brittle wiring. You should follow the wiring as closely as possible, however you must be within two feet of the plug.

Check the oil pressure sensor

A simple multimeter can be used to test the oil pressure sensor/switch. This video will demonstrate how you can test any type of oil pressure sensor.

A mechanical oil pressure tester could be purchased from AutoZone and Harbor Freight. They’re usually around $25-$40 and will 100% tell you if you have a real oil pressure problem. That’s about the same price as a new oil pressure sensor, and you’ll be plugging into the same hole anyway.

If the manual oil pressure checks out, you have positive proof that your Veloster doesn’t have a sensor or wiring issue.

Mechanical Problems

While a bad oil pressure sensor or wiring issue is the most common cause of P0523, it’s not the only one. This code can be caused by a defective oil pump, restricted oil passage or faulty wiring. You can verify this with an oil pressure test kit (it’s just a mechanical oil gauge with adapters to fit most makes/models).

Conclusion

Although there may be a few problems that might cause P0523 on the Hyundai Veloster's engine, you can start with checking the oil. Also check the pressure sensor. More often than not, that’ll fix the code. You are welcome!