Chassis, generic

C00A2 Driveline Control Module Power Transfer Unit Control Circuit Driver

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

The power transfer unit sits at the front transaxle of a front-based AWD car and, on disconnecting systems, can uncouple the propshaft. AAM's EcoTrac, introduced on the 2014 Jeep Cherokee, separates the driveline at both the PTU and the rear module under command of its own control unit. In an AAM patent a power-operated actuator, for example a solenoid, moves the PTU mode collar only after the rear clutch has brought the propshaft up to speed; a Linamar patent energises a PTU coil with brief pulses of about 3 to 4 A and tracks the sleeve with a Hall or linear sensor. C00A2 means the output stage feeding that actuator reports a fault, such as overcurrent, short, open load or overtemperature, the classes that automotive driver ICs like TI's DRV8873-Q1 flag. No manufacturer publishes a C00A2 case.

Likely causes

Short to ground or battery on the PTU actuator circuit
PTU actuator coil or motor open or internally shorted
Damaged output stage inside the driveline module

Symptoms

  • AWD unavailable, vehicle stays in front-wheel drive
  • AWD warning lamp or message

Repair estimate

DifficultyHardWorkshop job
Parts and labour€80–1,300
Time0.5–4 h

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

Parts involved

driveline moduleptu

Related codes

C00A1C00A3C00A5C0631

References: prnewswire.com, patents.google.com, patents.google.com, ti.com.