FUEL CONTROL UNIT - POWER SUPPLY
Power supply issue detected in the fuel control unit.
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What it means (plain English)
The fuel control unit isn't getting the proper voltage it needs to work, which can mess with fuel delivery and engine performance.
What the computer is actually seeing
The fuel control unit reports an irregular voltage level, typically below 8 volts or above 16 volts.
What a healthy reading looks like
Voltage to the fuel control unit should be between 9-16 volts when the ignition is on.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Inspect the wiring and connectors leading to the fuel control unit. Look for frays, breaks, or corrosion.
- 22. Measure the voltage at the fuel control unit's connector with the ignition on. Expected is 9-16 volts. If below or above, check the wiring further back to the source.
- 33. Test the ground connection for continuity. Use a multimeter; expected resistance is less than 1 ohm. Repair any bad ground issues found.
- 44. If voltage and ground are good, replace the fuel control unit as it may be faulty.
Common causes
- Broken or shorted wiring in the power circuit.
- Faulty fuel control unit.
- Bad ground connection to the fuel control unit.
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
No, it's high severity. The engine could stall or have severe performance issues.
Will this code come back after clearing?
If the underlying issue isn’t fixed, it will likely return.
Why does this code pair with SPN 1813?
They both relate to power supply issues affecting the fuel system; troubleshooting one may lead to the other.
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