Code Definition

P0655 — Engine Hot Lamp Output Control Circuit Malfunction

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

About P0655

P0655 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 P0655 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

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 P0655 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 P0655 code indicates a malfunction in the control circuit of the Engine Hot Lamp, also known as the engine overheating warning lamp. This issue arises when the Engine Control Module (ECM) cannot properly control the operation of the lamp. The engine hot lamp is a critical indicator that informs the driver when the engine temperature exceeds normal operating ranges, potentially signalling overheating. A malfunction in this circuit could be due to issues with the wiring, connections, the lamp itself, or the ECM's ability to control the lamp, leading to a failure in alerting the driver about ...

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