The P0233: Fuel Pump Secondary Circuit Intermittent refers to an issue where there is an intermittent connection within the fuel pump’s secondary circuit. This problem can be caused by a variety of factors, such as a faulty fuel pump, wiring issues, or a malfunctioning Powertrain Control Module (PCM). When this code appears, it indicates that there is an unreliable connection affecting the fuel pump’s operation, which could lead to performance issues or even a no-start condition.
P0233 – Quick Overview
| Meaning | P0233: Fuel Pump Secondary Circuit Intermittent |
| Is it serious? | Yes, this code is serious as it may cause intermittent fuel supply to the engine, leading to performance issues, stalling, or a no-start condition. |
| Possible causes | – Intermittent connection in the fuel pump secondary circuit – Faulty fuel pump – Wiring or connector issues – Faulty PCM |
| How to diagnose? | – Inspect the fuel pump for intermittent operation. – Check wiring and connectors for loose or corroded contacts. – Perform a wiggle test to identify intermittent faults. – Replace or repair any faulty components. |
P0233 Meaning
The P0233: Fuel Pump Secondary Circuit Intermittent code indicates that there is an intermittent issue within the secondary circuit of the fuel pump. This could be due to loose connections, a malfunctioning fuel pump, or issues within the vehicle’s electrical system. When this code is triggered, it means the fuel pump is not receiving a consistent power supply, which can lead to engine performance problems or even prevent the engine from starting.
Step-by-step diagnostic guide
Follow the outlined procedure to diagnose this DTC by eliminating possible causes one by one.
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check if there are any other related codes present. These might give additional clues about the problem. | OBD-II Scanner |
| Inspect the Fuel Pump | Visually inspect the fuel pump for any signs of damage or intermittent operation. Listen for unusual noises that could indicate an issue. | Flashlight, Safety Gloves |
| Perform a Wiggle Test | While the vehicle is running or the ignition is on, wiggle the wiring and connectors related to the fuel pump to identify any intermittent faults. | Flashlight, Multimeter |
| Inspect Wiring and Connectors | Carefully check the wiring and connectors leading to the fuel pump for any signs of wear, corrosion, or breaks. Look for loose or disconnected wires. | Flashlight, Multimeter |
| Repair or Replace Damaged Wiring/Connectors | If any wiring or connectors are damaged or corroded, repair or replace them. Ensure connections are secure and free from dirt or corrosion. | Wire Strippers, Electrical Tape, Replacement Wires/Connectors |
| Check the PCM (Powertrain Control Module) | Inspect the PCM and its connections for any signs of damage or loose connections. If the PCM is suspected to be faulty, it may need reprogramming or replacement. | OBD-II Scanner, Multimeter |
| Clear the Code and Test Drive | After completing the necessary repairs, clear the P0233 code using the OBD-II scanner. Take the vehicle for a test drive to ensure the issue is resolved and the code does not return. | OBD-II Scanner, Vehicle Owner’s Manual |
| Recheck for Codes | After the test drive, re-scan the vehicle to ensure the P0233 code has not reappeared. If the code returns, further diagnosis may be required. | OBD-II Scanner |
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I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko