U0217: Lost Communication With Door Switch C

What it means

The reporting module has lost communication with door switch C. It sets this code when expected switch messages are not received for a specified time.

How it works

Door Switch C sends door status messages to other modules over the vehicle network. This code is set when expected messages from switch C are not received for the required period; the code does not specify which door it represents.

Common causes

Most likely first.

1. Switch power or ground fault
2. Damaged or corroded wiring or connectors
3. CAN bus fault
4. Door switch C failure
5. Low battery voltage

Symptoms

• Door status may display incorrectly
• Door warning or courtesy light may malfunction
• Other communication codes

How to diagnose it

1. Save freeze-frame data and scan all modules for communication codes to determine whether the missing messages are specific to Door Switch C.
2. Check the battery condition, then inspect the power and ground connections for switch C.
3. Inspect switch C's connector and nearby wiring for corrosion, looseness, physical damage, or a broken wire.
4. Use a scan tool to compare the reported status from switch C with the actual door position and check whether the module responds.
5. If power and ground are good, test the relevant network wiring and switch operation against the manufacturer's specification.

Common fixes

• Clean and secure the power, ground, or connector connection at Door Switch C.
• Repair damaged wiring or corroded terminals serving switch C.
• Correct a low battery or charging issue if it caused communication loss.
• Repair a network wiring fault confirmed by testing.
• Replace Door Switch C if it fails testing despite sound supply and network connections.

Can I keep driving?

Driving is usually possible, but the door status display, warning, or courtesy light associated with switch C may not work correctly. Verify that all doors are latched before driving, because the vehicle may not reliably indicate their status.