Driveline Disconnect Switch Input Circuit
The P0818 code means the vehicle's onboard diagnostic system has detected: Driveline Disconnect Switch Input Circuit. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $150 - $800 (parts and labor)
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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What Are the Symptoms of P0818?
- Check Engine Light illuminated
- AWD or 4WD system not engaging properly
- Driveline disconnect warning light on
- Front or rear axle may not receive power
What Causes P0818? (Most Likely First)
- Faulty driveline disconnect switch or sensor Very High
- Wiring fault in disconnect switch circuit High
- Driveline disconnect actuator failure Moderate
- Transfer case control module error Low
Can I Still Drive with P0818?
Short distances only. P0818 is rated moderate severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
Frequently Asked Questions
What is a driveline disconnect system?
A driveline disconnect system can disengage one axle from the drivetrain when AWD or 4WD is not needed. This reduces parasitic drag and improves fuel economy.
Can I still drive in 2WD mode with P0818?
Usually yes, but the AWD or 4WD system may not engage when needed. Avoid slippery conditions or off-road driving until the repair is completed.
Is the Jeep Cherokee prone to P0818?
Yes, the 2014 and newer Jeep Cherokee with the active drive system has reported driveline disconnect issues. A software update or actuator replacement often resolves it.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P0818?
-
Use a scan tool to check the driveline disconnect switch status in live data
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Inspect the disconnect switch connector and wiring for damage
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Test the driveline disconnect actuator operation
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Verify transfer case mode selection and engagement
Sources 2
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)
- Cross-checked against the SAE J2012:2002 DTC table (2026-08-27)archived scan of the SAE standard — readable copy, not SAE’s current edition
Which Vehicles Commonly Get P0818?
- 2014-2020 Jeep Cherokee
- 2011-2019 Jeep Grand Cherokee
- 2015-2020 Ram 1500
- 2010-2018 Ford Explorer AWD
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