Four Wheel Drive (4WD) Switch Circuit Low

Where it lives

For P0838, the switch sits on the circuit this code reports. The description of P0838 reports a fault at the switch.

Check these first

• A short to ground in the 4WD switch signal wire
• A 4WD switch stuck in one position
• Water in the 4WD switch connector
• A poor 4WD switch ground

What to do next

1. Read 4WD switch voltage
2. Test the signal wire for a short to ground
3. Check the 4WD switch ground
4. Dry and reseat the 4WD switch connector
5. Replace the switch if the signal stays low
6. Clear the code and retest

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