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.
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Common Symptoms
- 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
Probable Causes (Ranked by Likelihood)
- 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
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
Step-by-Step Diagnostic Procedure
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Scan for codes and confirm P2773 with freeze frame data
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Check transmission fluid level and condition
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Inspect wiring and connectors for the affected circuit
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Test the specific sensor or actuator identified in the code description
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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)
Commonly Affected Vehicles
- 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
Related Codes
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