Code Definition

P0616 — Starter relay circuit low

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

About P0616

P0616 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 P0616 is stored, the module has detected a signal or supply voltage lower 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 P0616 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 P0616 fault code is set when the Engine Control Module (ECM) detects a lower than expected voltage in the starter relay circuit. The starter relay acts as a switch, controlling the power supply from the battery to the starter motor when initiating the engine's starting process. A low voltage in this circuit can indicate an electrical issue such as a short to ground, a failing starter relay, or problems with the wiring or connectors. This condition can lead to difficulties in starting the vehicle, such as the engine not cranking when the ignition key is turned, or intermittent starting prob...

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