What Does P0233 Mean?
The fuel pump secondary circuit is exhibiting intermittent electrical behavior, with the ECM detecting sporadic signal loss or erratic feedback from the secondary fuel pump control circuit. This can manifest as brief fuel delivery interruptions. The driver may notice occasional stumbles, misfires, or momentary power loss, especially under high fuel demand situations like acceleration or hill climbing.
Common Causes
30%
Intermittent wiring fault in the secondary fuel pump circuit due to vibration or heat
25%
Failing secondary fuel pump with intermittent electrical contact
20%
Corroded or loose connector at the secondary fuel pump
15%
Fuel pump driver module with thermal intermittent fault
10%
ECM connector back-out or pin fatigue on the pump circuit
Diagnostic Steps
1
Use live data to monitor secondary fuel pump duty cycle or current while driving — look for intermittent drops to 0% or erratic fluctuations during steady-state operation.
2
Inspect all connectors in the secondary fuel pump circuit for signs of heat damage, corrosion, or loose fit. Pay special attention to connectors near the engine that experience heat and vibration.
3
Perform an extended wiggle test: with the engine idling, systematically flex each section of the pump circuit wiring while monitoring fuel rail pressure for any dips.
4
If equipped with a fuel pump driver module, check its mounting and connector. Some modules are mounted on the frame rail and corrode from road splash — measure connector pin resistance.
5
Measure voltage drop across each connection in the pump circuit under load. Use a DVOM on MIN/MAX hold during a test drive to capture transient high-resistance events.
Estimated Repair Cost
$150 - $700
Parts + labor, varies by vehicle and location
The fuel pump secondary circuit is exhibiting intermittent electrical behavior, with the ECM detecting sporadic signal loss or erratic feedback from the secondary fuel pump control circuit. This can manifest as brief fuel delivery interruptions. The driver may notice occasional stumbles, misfires, o...
The most common cause of P0233 (Fuel Pump Secondary Circuit Intermittent) is: Intermittent wiring fault in the secondary fuel pump circuit due to vibration or heat
Typical repair costs for P0233 range from $150 to $700, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Use caution, especially in highway driving. An intermittent secondary fuel pump circuit can cause sudden, unpredictable power loss. This is particularly concerning during acceleration or passing maneuvers. Schedule diagnosis promptly and avoid situations requiring sustained high power output.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0233 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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