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Home / DTC / C0600 — 4WD/AWD Range Actuator Position Control Error

C0600 — 4WD/AWD Range Actuator Position Control Error

Detailed page for trouble code C0600.

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Code

C0600

Generic C — Chassis

4WD/AWD Range Actuator Position Control Error

Brand: Generic
Type: C — Chassis
Views: UK: 18 EN: 29 RU: 16
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Page language: EN

Causes

  • Failed or sticking range/transfer case actuator (motor or geartrain)
  • Faulty actuator position sensor (potentiometer/Hall sensor)
  • Open, shorted or corroded wiring/connectors between actuator and control module
  • Low or intermittent supply voltage (battery, fuse, relay, ground)
  • Mechanical binding or damage in transfer case or linkage
  • Faulty transfer case control module / body control module or software issue

Symptoms

  • 4WD/AWD warning lamp or service light illuminated
  • Inability to engage or disengage 4WD/AWD modes
  • Drive mode may be stuck in 2WD or permanent 4WD
  • Noise (grinding or motor whine) from transfer case when attempting mode change
  • Traction control/ABS related warnings in some vehicles
  • Reduced drivability or limp-home mode in severe cases

What to check

  • Scan vehicle for C0600 and any other related codes; note freeze-frame and module data
  • Visually inspect actuator connector and wiring for corrosion, damage, pin push-out or moisture
  • Check fuses and relays feeding the actuator and control module
  • With key ON, use a scan tool to monitor commanded position vs actual position feedback
  • Command the actuator via a bi-directional scan tool and observe movement and feedback
  • Check battery voltage (should be ~12–14 V) and ground integrity while commanding the actuator

Signal parameters

  • Actuator position sensor: typical analog feedback ~0.5–4.5 V across travel (varies by manufacturer)
  • Motor/actuator supply: switched battery voltage ~9–14 V when commanded
  • Ground path: near 0 V with good connection
  • Actuator motor winding resistance: typically low (single- to low-double-digit ohms), verify manufacturer spec
  • Control signals may be PWM or variable voltage; PWM frequency commonly between 50–500 Hz depending on system
  • CAN bus idle voltages: CAN High ~2.5–3.5 V, CAN Low ~1.5–2.5 V (if applicable for communication faults)

Diagnostic algorithm

  1. Retrieve and record all stored codes and live data from related modules (transfer case, BCM, ABS). Note whether fault is current or intermittent.
  2. Perform a visual inspection of actuator harness and connector for corrosion, water intrusion, broken wires or poor pins. Repair as needed.
  3. Verify fuses and relays supplying the actuator and control module; replace if faulty.
  4. With a multimeter, check battery voltage at the actuator connector and verify good ground while commanding the actuator with the key ON. Watch for voltage drop under load.
  5. Using a scan tool, command the actuator to change range while observing actual position feedback. If commanded but no movement, suspect motor or mechanical binding.
  6. Back-probe the position sensor circuit and observe feedback voltage while commanding or manually moving the actuator (if serviceable). Confirm feedback changes smoothly without dropouts.
  7. Measure actuator motor winding resistance and compare to specification; check for short to ground or open circuit.
  8. If wiring and power are good but actuator still fails, remove and bench-test or replace actuator assembly per manufacturer instructions.
  9. If actuator tests good, check for communication errors on CAN bus and perform module reprogramming or replacement only after confirming wiring and actuator integrity.
  10. Clear codes, perform functional test of range selection, and road test to confirm normal operation and that the code does not return.

Likely causes

  • Corroded/loose connector or damaged wiring to the actuator
  • Failed actuator position sensor (feedback signal out of range or intermittent)
  • Actuator motor failure or internal gear binding
  • Blown fuse or faulty relay supplying the actuator
  • Intermittent module communication (CAN or module fault)

Fault status

⚠️ Status
Control module detected an invalid or out-of-range position feedback from the 4WD/AWD range actuator or an abnormal actuator control circuit (open/short/low voltage/intermittent). Fault may be logged as current, pending, or intermittent depending on occurrence.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

Similar codes

C0601 C0602 C0603 C0610 U0121 U0140
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