Chassis, generic

C0071 2/4 Wheel Drive Status Input

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

Covers the input that tells the ABS/ESC module whether the vehicle is in two- or four-wheel-drive mode. Because four-wheel drive links the axles and changes how wheel speeds relate, the stability and ABS strategy must know the current drive mode; this signal comes from the transfer-case switch, the drive-mode selector or a message from the drivetrain controller. The code is set when that status is missing, implausible or inconsistent with observed wheel behaviour. Subaru documents DTC C0071 in the vehicle dynamics control system with revised troubleshooting. A fault can make the module default to a safe strategy, disable some functions and set the ABS/ESC warning lamp while base braking remains. The entry follows the SAE J2012 generic definition and all-wheel-drive mode-signalling design.

Likely causes

Transfer-case or mode switch fault
Missing drive-mode message on the bus
Harness or connector fault

Symptoms

  • Stability or ABS strategy limited
  • ABS/ESC warning lamp on
  • Drive-mode display incorrect

Repair estimate

DifficultyMediumDIY possible
Parts and labour€60–600
Time0.5–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

drive mode switch

Related codes

C0090C0095C006C

References: en.wikipedia.org, patents.google.com.