Transmission Mode Switch B Circuit

Where it lives

For P071D, the circuit described runs through the switch. The description of P071D reports a fault at the switch.

Check these first

• A failing mode switch B
• A short or open in the switch B wiring
• Corrosion at the switch connector
• Damage from fluid or heat at the case

What to do next

1. Check the mode switch B state on a scan tool
2. Inspect the switch and connector for damage
3. Test the wiring for a short or open
4. Compare the switch state in each mode
5. Replace the mode switch if the circuit is sound
6. Clear the code and retest

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