Four Wheel Drive Low Ratio Switch Open Circuit
The P2773 code means the vehicle's onboard diagnostic system has detected: Four Wheel Drive Low Ratio Switch Open Circuit. This is a serious severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- Advanced
- Estimated cost
- $200 - $1,500 (sensor/switch to transfer case repair)
Read and clear transmission codes. Many trans codes are caused by low or burnt fluid -- check level and color before assuming the worst.
Basic scanners only read engine codes. This reads transmission, ABS, and airbag too.
Affiliate links — we earn a commission at no extra cost to you.
What Are the Symptoms of P2773?
- Check Engine Light or 4WD warning light on
- 4WD low range not engaging or disengaging properly
- Transfer case may make grinding noises
- Vehicle may be stuck in 4WD low mode
- Drivetrain warning messages on dash
What Causes P2773? (Most Likely First)
- Faulty 4WD low range switch or sensor High
- Wiring fault in transfer case circuit High
- Transfer case actuator motor failure Medium
- Transfer case internal mechanical failure Medium
- TCM/PCM communication error Low
Can I Still Drive with P2773?
Short distances only. P2773 is rated serious severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
Frequently Asked Questions
What does P2773 mean?
P2773 indicates: four wheel drive low ratio switch open circuit. This code is set by the transmission control module when it detects an issue with this specific circuit or component.
Can I drive with P2773?
Yes, short distances are acceptable. The vehicle may be drivable but schedule repair promptly.
How much does it cost to fix P2773?
Estimated repair costs are $200 - $1,500. The specific cost depends on whether the fix involves a sensor replacement, wiring repair, or more extensive transmission work.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P2773?
-
Scan for codes and confirm P2773 with freeze frame data
-
Check transmission fluid level and condition
-
Inspect wiring and connectors for the affected circuit
-
Test the specific sensor or actuator identified in the code description
-
Check for related technical service bulletins for your vehicle
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
Which Vehicles Commonly Get P2773?
- 2012-2020 Ford F-150 10R80 10-Speed Auto
- 2014-2022 Chevrolet Silverado 10L80 10-Speed Auto
- 2011-2019 Ram 1500 8HP70 8-Speed Auto
- 2015-2021 Jeep Grand Cherokee 8HP70 8-Speed Auto
- 2013-2021 BMW X5 ZF 8HP 8-Speed Auto
Explore More
Was this helpful?
Send this to whoever is fixing the car — your mechanic, or the person asking what the light means.