P0828 low

Up and Down Shift Switch Circuit High

The P0828 code means the vehicle's onboard diagnostic system has detected: Up and Down Shift Switch Circuit High. This is a low severity code.

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Keep driving?
Yes, but fix soon
DIY difficulty
moderate
Estimated cost
$75 - $400 (parts and labor)
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Common Symptoms

  • Check Engine Light illuminated
  • Manual shift mode unavailable
  • Shift switch always reads as released
  • TCM does not respond to manual shift inputs

Probable Causes (Ranked by Likelihood)

  • Open circuit in shift switch wiring Very High
  • Disconnected or damaged shift switch connector High
  • Faulty shift switch stuck in open position Moderate
  • TCM reference voltage issue on switch input Low

Step-by-Step Diagnostic Procedure

  1. Check for an open circuit in the shift switch signal wire

  2. Verify connector is fully seated at the shift switch

  3. Test switch operation with a multimeter for proper continuity when pressed

  4. Check TCM reference voltage at the switch connector

Frequently Asked Questions

What does circuit high mean for P0828?

Circuit high means the voltage on the shift switch signal is above the expected maximum. This usually indicates an open circuit where the signal wire is pulled up to reference voltage because the ground path through the switch is broken.

Is P0828 the opposite of P0827?

Yes. P0827 indicates the circuit is shorted low while P0828 indicates it is open or shorted high. The diagnostic approach is similar but focuses on different types of faults.

Can I drive normally with P0828?

Yes, the transmission will operate normally in automatic mode. Only the manual shift function is affected.

Sources

This page is built from documented references. Verify against your own service info before repair work.

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