Fuel Pump Primary Circuit Malfunction
What does P0230 mean?
The P0230 code means the vehicle's onboard diagnostic system has detected: Fuel Pump Primary Circuit Malfunction. This is a critical severity code.
Common Symptoms
- Engine cranks but will not start
- Engine stalls suddenly while driving
- Loss of fuel pressure
- Check Engine Light illuminated
- No fuel pump humming sound when key is turned on
Probable Causes (Ranked by Likelihood)
- Failed fuel pump relay Very High
- Faulty fuel pump High
- Blown fuel pump fuse High
- Damaged wiring between fuel pump relay and fuel pump Moderate
- PCM fuel pump driver circuit failure Low
Step-by-Step Diagnostic Procedure
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Check the fuel pump fuse and relay in the fuse box -- swap relay with a known good one and test
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Turn ignition to ON (not start) and listen for a 2-3 second fuel pump hum from the fuel tank area
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Test for 12V power at the fuel pump connector with key on -- no voltage indicates a wiring or relay issue
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Measure fuel pressure at the rail with a gauge -- should read 40-60 PSI on most vehicles
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If power reaches the pump but it does not run, replace the fuel pump assembly
Frequently Asked Questions
Can I drive with code P0230?
No. This code indicates a fuel pump circuit malfunction that can cause the engine to stall without warning or prevent it from starting. Have the vehicle towed to a repair facility.
How do I know if it is the relay or the pump?
Swap the fuel pump relay with an identical relay from another circuit (such as the horn relay). If the pump works with the swapped relay, the original relay is faulty. If not, test for power at the pump connector.
Is a fuel pump replacement expensive?
Fuel pump replacement typically costs $400-$800 including parts and labor. Most of the cost is labor since the fuel tank usually needs to be dropped to access the pump.