P0231 | p0231 fuel pump secondary circuit low | code p0231 | p0231 obd2 | dtc p0231

P0231 | p0231 fuel pump secondary circuit low | code p0231 | p0231 obd2 | dtc p0231

Hello friends welcome to the ig garage channel today I am telling you how to fix p0231 fuel pump secondary circuit low so watch this video and learn how to fix it friends if you like this video then subscribe to the ig garage channel for more videos.

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In this video, we’ll break down the P0231 trouble code, which signals a low voltage condition in the fuel pump secondary circuit. If your engine is struggling to start, or you're experiencing fuel delivery problems, this code could be the culprit. Let’s explore its meaning, symptoms, causes, sensor location, and how to fix it.

❓ What is Code P0231?
P0231 – Fuel Pump Secondary Circuit Low
This code means the Powertrain Control Module (PCM) is detecting lower-than-expected voltage at the fuel pump's secondary power circuit, even though the fuel pump relay is activated. This can lead to starting problems or poor engine performance.

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⚠️ Symptoms of P0231:

🚨 Check Engine Light ON

🛻 Long crank time or no start condition

⚠️ Engine stalling

⛽ Poor fuel pressure or delivery

🔄 Rough idling or hesitation

🔍 Common Causes of P0231:

❌ Faulty fuel pump or failing fuel pump motor

🔌 Loose, corroded, or damaged wiring/connectors in the fuel pump circuit

⚡ Faulty fuel pump relay

📉 Grounding issue or voltage drop

🧠 PCM failure (rare)

📍 Fuel Pump Circuit Location:
The fuel pump is usually located inside the fuel tank, and the secondary circuit wiring runs from the relay to the pump. Access may require removing the rear seat or fuel tank depending on the vehicle model.

🛠️ How to Fix Code P0231:

🔍 Inspect all wiring and connectors between the fuel pump relay and pump

🔁 Replace any damaged wires or corroded terminals

🧪 Test the fuel pump relay and power supply with a multimeter

🛠️ Replace the fuel pump if voltage is present but it’s not operating

💻 Reset the code and test-drive to verify repair

🧠 PCM testing only if no other faults are found

💰 Estimated Repair Cost:

Fuel Pump: ₹5,000 – ₹12,000

Wiring Repair: ₹500 – ₹2,000

Relay Replacement: ₹300 – ₹800

PCM (if needed): ₹10,000+

✅ Fixing P0231 ensures proper fuel delivery, smooth starts, and reliable engine performance.

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