P0837

What it means

4WD switch is electrically intact but its values do not match a valid bit pattern — multiple positions asserted simultaneously, or values outside the calibrated range.

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

• Contaminated rotary contact

  high

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

• Sensor element aged beyond calibration window

  low

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

• Sensor mounting loose - signal damping

  low

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

Related help

• Full P0837 diagnosis, causes & costs
• How to read check engine light codes
• Is it safe to drive with the light on?