Code Definition

P0828 — Up and Down Switch Input Circuit High

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0828

P0828 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0828 is stored, the module has detected a signal or supply voltage higher than the expected operating range.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0828 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

This fault code is triggered when the control module detects a high voltage condition in the input circuit of the up and down switch, which is typically used in vehicles with manual shifting capability within an automatic transmission system. The 'high' condition indicates that the voltage level in the circuit is above the threshold expected by the control module. This could be due to a short to power in the circuit, a malfunction within the switch itself, or an issue in the wiring that is causing excessive voltage to be present.

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