C0091

4WD/AWD Power Transfer Unit Position Sensor A

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Incorrect operation of the all-wheel drive system
Check engine light comes on
The car goes into emergency mode
Unusual noises from the transfer case

Causes

Position sensor malfunction
Wiring harness damage
Poor contact in the sensor connector
Mechanical damage to the transfer case
Transmission control unit malfunction

How to Fix

Check the integrity of the wiring harness
Clean sensor contacts
Check sensor resistance
Replace position sensor if necessary
Check the mechanical condition of the transfer case

Related codes

C0090 C0092 P0700