P2773
Four Wheel Drive (4WD) Low Switch Circuit Low
Drivetrain / 4WD
Generic OBD-II
Low
What it means
P2773 means the module saw a lower-than-expected voltage in the 4WD Low range switch circuit — usually a wiring short-to-ground, a bad connector, or a failed switch. It affects your ability to select or confirm four-wheel-drive low range, not how the engine runs, so the vehicle still drives normally in its current mode.
Low
Can I keep driving? Yes — the vehicle drives normally; you may just be unable to engage or confirm 4WD Low range until it's fixed.
Common symptoms
What you'll notice
- 4WD Low range won't engage, or the dash indicator won't light
- 4WD or transfer-case indicator flashing or stuck
- Check-engine or 4WD warning light on
- Transfer case may stay in high range only
Common causes
Most likely first
- Short-to-ground or open in the 4WD Low switch circuit wiringLikely
- Failed 4WD Low-range selector switchCommon
- Corroded or loose connector at the switch or transfer-case moduleCommon
- Faulty transfer-case shift motor or encoderLess often
- Transfer Case Control Module (TCCM) faultLess often
How to diagnose & fix
Work through it in order
- Scan and read freeze-frame data to confirm the circuit and conditions.
- Inspect the 4WD Low switch connector and wiring for shorts to ground, damage, or corrosion.
- Test the switch for correct signal in each range position.
- Check the transfer-case shift motor and encoder if the switch tests good.
- Replace the switch or repair the wiring, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with P2773?+
Yes for normal 2WD/AWD driving. The main effect is that 4WD Low range may not engage or confirm, so avoid relying on it off-road until it's fixed.
Can I just clear P2773?+
You can, but it returns as soon as the low switch circuit is read again unless the wiring or switch fault is repaired.
Related codes
Often seen with P2773
Read & clear P2773 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX