Checks, in order
- Engagement conditionsShift to 4 Low usually requires being stopped or crawling, with the transmission in Neutral. Check the owner's manual steps for your truck, because the 4WD light will blink until they are met.easy $ · under about $50
- Battery and system voltageWeak voltage causes electric 4WD faults. Test the battery and charging system.easy $ · under about $50
- Front axle disconnectListen for the front axle to engage when you shift. A grinding noise or no sound can point to an axle actuator issue.medium $$ · about $50 to $500
- Transfer case fluidCheck the transfer case level at the fill plug and note the fluid condition.medium $ · under about $50
- Scan for codesA scan tool that reads the 4WD module will show stored codes for the shift motor, position sensors or the actuator.medium $$ · about $50 to $500
Applies to: 2016 to 2023 Tacoma with the 2TR-FE 2.7L four and the 2GR-FKS 3.5L V6, with the 6-speed automatic or 6-speed manual. Engine-specific checks are labeled; everything else applies to both.
Tools and parts for these checks
Links below are Amazon affiliate links: as an Amazon Associate, toyotadata earns from qualifying purchases, at no extra cost to you. Confirm fitment for your exact truck before you order.
| ITEM | USED FOR | BUY |
|---|---|---|
| Gear oil for your truck | Changing front diff and transfer case oil to the factory spec | Shop on Amazon |
| Fluid transfer pump | Filling through the fill or check plug | Shop on Amazon |
| Digital multimeter | Voltage, ground and continuity checks | Shop on Amazon |
| 1/2" drive click torque wrench | Tightening suspension and driveline bolts to spec | Shop on Amazon |
Other drivetrain problems on the 3rd Gen Tacoma
More 3rd Gen Tacoma problems
- Automatic keeps hunting between gears or downshifts early on hills (Transmission)
- Harsh, delayed or shuddering shifts, flare between gears (Transmission)
- Engine temperature climbing or overheating warning (Cooling)
- Turn the key or press the button: click or nothing, engine won't crank (Starting & Charging)
- Engine cranks but won't start or dies right after starting (Fuel & Ignition)
- Rough idle, shaking at a stop or misfire (P0300 to P0306) (Fuel & Ignition)
All 16 3rd Gen Tacoma symptoms in the interactive troubleshooter →
General guidance from owner experience. Confirm torque specs, fluid capacities and procedures in the factory service manual. Brakes, steering and anything structural: if in doubt, have a qualified shop inspect it before driving.