Code Definition

P0690 — ECM/PCM Power Relay Sense Circuit High

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

About P0690

P0690 is a generic (obd-ii standard) powertrain diagnostic trouble code recorded for Holden vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0690 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 P0690 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 engine control module (ECM/PCM) monitors the sense circuit on its power relay, which reads the voltage on the switched output side of the relay, to confirm the relay actually changes state when commanded. This sense feedback lets the PCM verify that the relay turns on and off as expected. DTC P0690 is set when the PCM detects a voltage on the sense circuit higher than expected, for example battery voltage present when the relay should be off, indicating a short to constant power, welded relay contacts, or a sense circuit fault, and the condition persists. Because the relay feeds the PCM an...

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