Code Definition

P0802 — Transmission Transfer case signal circuit open circuit

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

About P0802

P0802 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 P0802 is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit.

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 P0802 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

The fault code P0802 is set when the Transmission Control Module (TCM) or Engine Control Module (ECM) detects an open circuit in the signal pathway related to the transmission transfer case. This issue is particularly relevant in vehicles equipped with four-wheel drive (4WD) or all-wheel drive (AWD) systems. The transfer case plays a vital role in these systems by distributing power between the front and rear axles. An open circuit means there is a break or disconnection in the electrical wiring or connectors that provide control and feedback signals to or from the transfer case. This can resu...

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