Error Code P0232: What It Means & What To Do?

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The P0232 fault code can be described as fuel pump secondary circuit high. The P0232 is a generic OBD-II code which can start appearing when the engine control module would detect that the secondary circuit to the fuel pump has a high voltage when the fuel pump relay is turned off.

The fuel pump would enable the transfer of the fuel from the fuel tank to the fuel injectors in the engine. The engine computer or the fuel pump control module would control the fuel pump. Now when the ignition would be turned on, the powertrain control module or the fuel pump control module would activate the fuel pump. If an incorrect signal is detected by the powertrain control module to or from the fuel pump, then the P0232 fault code would start appearing.

What causes this problem with the Fuel Pump Secondary Circuit High?

• There can be some issues with the fuel pump relay
• Harness chafing may cause open in fuel pump supply circuit
• The feedback circuit might be open
• Fuel pump fuse can blow out due to short to ground
• Problem of loose or damaged connectors

1. Powertrain Control Module - OBD Code P0232 can appear because of faulty Powertrain Control Module.
2. Fuel Pump Relay - There can be some issues with the Fuel Pump Relay due to which you may see P0232 code appearing over and over again. Visit us to buy best quality Fuel Pump Relay online.
3. Engine Wiring Connectors - Are you facing some faults in your Engine Wiring Connectors? Don’t worry and get them replaced or else P0232 code can turn up.
4. Fuel Pump - Common cause behind this P0232 error code can be some fault in Fuel Pump. So, it will be a good decision to replace them now.

It is essential to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0232 here:

Common Symptoms

• There can be no start and stall
• The fuel supply can be inadequate
• Misfire can begin

Want to correct the Trouble Code P0232? Read these points mentioned below:

If you are willing to diagnose fuel pump circuits there's no replacement for a good wiring diagram. You can always try to locate one before attempting a complex repair. If the vehicle will start and run and no driveability complaints are present, then you must suspect an open in the feedback circuit between the powertrain control module and where it splices into the fuel pump supply voltage circuit. You can always repair it if needed.

If the vehicle doesn't start or starts and dies due to low fuel pressure, then you should check the fuel pump fuse. If you find out that it is blown, then check for a short to ground on the fuel pump voltage supply circuit. Do this by removing the fuel pump relay and then check the resistance between the voltage supply circuit at the fuel pump connector and ground. If you have little resistance indicating a short to ground, the fuel pump should be unplugged and check it once again. If it shows high or infinite resistance after unplugging the fuel pump, replace the shorted fuel pump.

Now if the resistance is still low even after unplugging the fuel pump then repair short in the FP voltage supply circuit and if the resistance check is showing that the fuel pump supply circuit is okay then re-check between the FP fuse and the FP relay. There has to be a short somewhere. Carefully check for wiring harness chafing in certain areas. Repair as necessary.

If the fuel pump fuse isn't blown and the vehicle won't start or starts and stalls due to low fuel pressure then remove the fuse and check that voltage is present to the fuse. After that you should check that voltage is travelling from the fuse to the FP relay by re-installing the FP fuse and checking for battery voltage at the FP relay. If the FP fuse or the FP relay doesn't have voltage supplied to it, the fuel pump will not be able to operate.

Find the open in the circuit and repair as necessary. If both the FP fuse and the FP relay have sufficient voltage, remove the FP relay and install a fused jumper wire to complete the FP voltage supply circuit. Usually this is done by jumping terminals 30 & 87 in most relays-check a wiring diagram to be sure. If the fuel pump runs, replace the faulty FP relay and recheck.

If the fuel pump doesn't run check for voltage present with jumper connected or by cycling the ignition key with FP relay installed at the fuel pump connector at the fuel tank. If voltage is present verify that the ground circuit is intact. If both are okay, then you should replace the fuel pump. If voltage isn't present at the fuel pump with fused jumper wire installed, then the open in fuel pump voltage supply circuit should be repaired properly.

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Here are some steps which you should follow in order to diagnose this fault code:

• The fuel pump secondary circuit is the feedback circuit that would provide input data about the primary fuel pump circuit to the powertrain control module. A successful diagnosis of this code must include checking all related fuses and relays to ensure that the proper amount of voltage is present (typically this is a 5-volt reference signal). If you want to successfully diagnose this code, then you would require a scanner or code reader, a digital volt ohmmeter, and access to a manufacturer’s wiring schematic
• You should start your diagnosis with a visual inspection of all wiring and connectors. The damaged, disconnected, shorted, or corroded wiring, connectors, and components should be repaired or replaced. Make sure that you retest the system after repairs are completed to ensure success. If all system wiring, connectors, and components as well as fuses appear to be in normal working order, then you should connect the scanner to the diagnostic connector and record all stored codes as well as freeze frame data
• This information can prove to be extremely helpful in diagnosing intermittent conditions that may have contributed to this code being stored. Now once the codes have been cleared, you should operate the vehicle to see if the code returns. Now if the code fails to return immediately, then you may have an intermittent condition
• Intermittent conditions can prove to be quite a challenge to diagnose and in extreme cases may have to be allowed to worsen before a correct diagnosis can be made. Test voltage at the fuel pump connector to determine if there is sufficient power and ground when the ignition key is in the start position
• If the required voltage is present at the fuel pump, then you should suspect a shorted or faulty pump and repair as necessary. If there is no voltage at the pump or the voltage is reduced, then the problem is likely in the electrical wiring or connectors

Common Mistakes When Diagnosing The P0232 Code

Most common mistake is that people consider that there would be definitely some error in the fuel pump when this code starts displaying