Faulty cylinder deactivation pressure sensor or its electrical connector; Damaged or chafed wiring between the sensor and the powertrain control module; Low engine oil level or degraded oil that cannot maintain proper pressure; Clogged oil passages or a restricted screen feeding the cylinder deactivation system; Sticking or failed cylinder deactivation solenoid or control valve; Internal oil pump wear or pressure regulator malfunction reducing supply; Rarely, a powertrain control module software issue or internal fault

DTC codes / P34xx · Auxiliary emission controls / P3498

P3498Cylinder Deactivation Pressure Sensor Bank 1

Q: What does code P3498 mean?

Cylinder Deactivation Pressure Sensor Bank 1. P3498 indicates that the powertrain control module has detected an abnormal signal from the cylinder deactivation pressure sensor on bank 1, which monitors oil pressure in the variable valve timing or displacement system. The computer compares this pressure reading to expected values during cylinder deactivation events and sets the code when the signal falls outside the allowed range.

P3498 indicates that the powertrain control module has detected an abnormal signal from the cylinder deactivation pressure sensor on bank 1, which monitors oil pressure in the variable valve timing or displacement system. The computer compares this pressure reading to expected values during cylinder deactivation events and sets the code when the signal falls outside the allowed range.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaAuxiliary emission controls

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms
Rough idle or misfire-like shuddering when the engine transitions in or out of cylinder deactivation mode
Reduced fuel economy because the engine may stay in full-displacement mode
A noticeable loss of power or hesitation during light-throttle cruising
In some cases, the engine may enter limp mode and limit RPM

Common causes, most likely first

Faulty cylinder deactivation pressure sensor or its electrical connector
Damaged or chafed wiring between the sensor and the powertrain control module
Low engine oil level or degraded oil that cannot maintain proper pressure
Clogged oil passages or a restricted screen feeding the cylinder deactivation system
Sticking or failed cylinder deactivation solenoid or control valve
Internal oil pump wear or pressure regulator malfunction reducing supply
Rarely, a powertrain control module software issue or internal fault

How to diagnose and fix it

Check engine oil level and condition; top off or change oil if it is low or dirty
Inspect the sensor connector and wiring for corrosion, looseness, or damage
Use a scan tool to view live cylinder deactivation pressure data and compare to specifications
Test the sensor with a multimeter for proper reference voltage and signal return
Verify oil pressure at the sensor port with a mechanical gauge to rule out a supply problem
Inspect and clean the oil control screen or passages for the cylinder deactivation system
If all else checks out, replace the pressure sensor and clear the code to see if it returns

What the pressure sensor is really telling you

A P3498 is often set by low oil pressure from a neglected oil change rather than a failed sensor, so always verify oil condition before condemning parts.
The sensor may read correctly at idle but drop out only during cylinder deactivation, so live data must be monitored during a test drive that activates the mode.
Wiring harness damage near hot exhaust components is a common hidden cause that a simple visual inspection can miss.
Replacing the sensor without checking the oil control screen can lead to a repeat failure if debris is blocking the passage.
This code does not always mean the sensor is bad; a sticking solenoid can cause pressure fluctuations that mimic a sensor fault.

Can I keep driving with P3498?

You can usually continue driving if the engine runs smoothly, but avoid heavy loads and prolonged idling until the fault is repaired. If the engine misfires, loses power, or the oil pressure warning light comes on, stop driving and have the vehicle towed.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.