P3494

What it means

The engine control module has detected the bank 1 cylinder deactivation position sensor signal is within electrical limits but does not change as expected during commanded deactivation transitions. Mechanical drag, sensor drift or contamination is the typical cause.

Is it safe to drive?

The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.

Most likely causes

• Sensor drift or aging

  high

  One of the most commonly reported causes for this code — check this first.

• Lifter mechanical drag

  medium

  A plausible cause — test and verify before replacing parts.

• Sensor face contamination

  low

  Less common, but worth ruling out after the more likely causes.

Related help

• Full P3494 diagnosis, causes & costs
• How to read check engine light codes
• Is it safe to drive with the light on?