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P0230 most often points to a failed fuel pump relay. Swap the fuel pump relay with another identical relay in the underhood fuse box and rescan. If the code clears or moves, the relay was the issue - a $15 fix. See replacement relays on Amazon ↗
🗺️ Where Is the Problem?
Blueprint view - P0230 fault localized to cylinder #1 (spark plug, ignition coil, or fuel injector)
These are statistical causes across ALL vehicles - your exact car may rank differently
For example, on a Honda 4-cyl the downstream O2 sensor causes P0230 64% of the time, but on a GM 5.3L V8 the catalytic converter is the cause 71% of the time. Get a probability ranking built specifically for your year, make, model, and mileage.
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🎯 Top Causes & Probability
50%
#1 - Most Likely
Failed Fuel Pump Relay
The fuel pump relay carries high current every time the key is on, and its contacts pit and weld over time. This is by far the most common P0230 cause and is usually a sub-$20 fix. Most relays are interchangeable with horn or AC compressor relays for a quick swap test.
🔩 Part
$10–$40
👨🔧 Labor
$0–$60
⚡ DIY Difficulty
Easy
30%
#2 - Check First
Worn Fuel Pump Motor
A fuel pump motor with worn brushes draws excess current that can trip the PCM driver and set P0230. Listen for a whining or buzzing pump and measure pump current draw during cranking. Most affected on vehicles past 100k miles.
🔩 Part
$120–$500
👨🔧 Labor
$200–$600
⚡ DIY Difficulty
Hard
20%
#3 - Less Common
Damaged Wiring or PCM Fuel Pump Driver
A chafed harness on the way to the fuel tank, or a failed PCM fuel pump driver, will set P0230 with a healthy pump and relay. Check the harness routing and connector at the tank, then test the PCM driver as the last step.
🔩 Part
$50–$300
👨🔧 Labor
$200–$800
⚡ DIY Difficulty
Hard
🚗 Most Affected Vehicles
🚦 Is It Safe to Drive?
P0230 is not safe to ignore. The vehicle can stall without warning or fail to start the next time you turn the key. Once the code is set, plan on a tow if the engine cuts out. Most P0230 issues progress quickly once they begin.
🔧 Step-by-Step Diagnosis
- Swap the Fuel Pump Relay - Pull the fuel pump relay from the underhood fuse box and swap with an identical relay (often horn or AC). Clear codes and try to start. If the engine starts and the code stays gone, replace the original relay.
- Listen for the Pump Prime - With the key turned to ON (not start), you should hear a 2–3 second priming whirr from the fuel tank. No prime sound combined with P0230 strongly suggests the pump itself or the wiring to the tank.
📍 Find a Trusted Shop Near You
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Tips for Choosing a Shop
- Ask if they charge a diagnostic fee and whether it applies toward the repair
- Request a written estimate before approving any work
- Ask specifically about the part brand - OEM vs. aftermarket matters for this code
- Check Google reviews for recent mentions of the specific repair you need