{"id":40398,"date":"2026-04-05T08:58:06","date_gmt":"2026-04-05T06:58:06","guid":{"rendered":"https:\/\/diagnozabam.ro\/sfaturi\/?p=40398"},"modified":"2026-04-05T08:58:06","modified_gmt":"2026-04-05T06:58:06","slug":"p0231-code-fuel-pump-secondary-circuit-low","status":"publish","type":"post","link":"https:\/\/diagnozabam.ro\/sfaturi\/blog\/p0231-code-fuel-pump-secondary-circuit-low\/","title":{"rendered":"P0231 Code \u2013 Fuel Pump Secondary Circuit Low"},"content":{"rendered":"

The P0231 code<\/strong> is a diagnostic trouble code that indicates a low voltage<\/a> condition in the secondary circuit of the fuel pump. This system is critical because it ensures proper fuel delivery from the tank to the engine. When the engine control unit (ECU) detects that the voltage in the fuel pump circuit is lower than expected, it triggers the P0231 code<\/strong>.<\/p>\n

Understanding the P0231 code<\/strong> is essential because insufficient fuel pressure can lead to engine performance issues, stalling, or failure to start. This guide explains the meaning, symptoms, causes, diagnosis, and repair solutions.<\/p>\n

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What Does P0231 Code Mean?<\/h2>\n

The P0231 code<\/strong> means that the ECU has detected a low voltage<\/a> condition in the fuel pump secondary circuit.<\/p>\n

The fuel pump operates using electrical signals controlled by the ECU through relays and wiring. If the voltage supplied to the pump is too low, it cannot operate efficiently, resulting in poor fuel delivery.<\/p>\n

This issue is typically electrical rather than mechanical.<\/p>\n

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Symptoms of P0231 Code<\/h2>\n

When the P0231 code<\/strong> is present, the following symptoms may occur:<\/p>\n