What are the common causes of P2838?

A short to ground on the shift fork B position signal wire. An open in the shift fork B position sensor ground. A failed shift fork B position sensor. A shift fork B stuck away from its detent.

Read shift fork B position voltage on a scan tool. Test the shift fork B position signal wire for a short to ground. Test the shift fork B position sensor ground for an open. Check the shift fork B position sensor connector pins. Replace the shift fork B position sensor if the circuit tests good. Clear the code and retest.

P2838

Shift Fork B Position Circuit Low

System: Transmission (P code)
Lamp: Check Engine Light
Category: Powertrain - Transmission

What it means

P2838 means Shift Fork B Position Circuit Low.

Check these first

A short to ground on the shift fork B position signal wire
An open in the shift fork B position sensor ground
A failed shift fork B position sensor
A shift fork B stuck away from its detent

What to do next

Read shift fork B position voltage on a scan tool
Test the shift fork B position signal wire for a short to ground
Test the shift fork B position sensor ground for an open
Check the shift fork B position sensor connector pins
Replace the shift fork B position sensor if the circuit tests good
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.