Electric Fuel Pump Control Circuit High Voltage
Indicates a high voltage condition in the electric fuel pump control circuit.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The engine control module (ECM) sees more voltage than it expects in the fuel pump control circuit, which can indicate a short to power or a fault in the wiring.
What the computer is actually seeing
The ECM monitors the fuel pump control circuit and expects around 0-5 volts when the pump is off and around 12 volts when it's activating. When it detects a voltage above 5 volts consistently, it triggers this code.
What a healthy reading looks like
Expected voltage is typically between 0.5V to 5V for off state and can reach up to 12V when the pump operates.
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. Check the wiring and connectors from the ECM to the fuel pump for fraying, corrosion, or damage. Repair any issues found. Decision Point: If damage is found and repaired, clear the code and test. If not, proceed to step 2.
- 22. Measure the voltage in the fuel pump control circuit with a multimeter while the key is in the ON position. It should be less than 5V when the pump is not being commanded on. Decision Point: If voltage is above 5V consistently, check for shorts. If under 5V, proceed to step 3.
- 33. Test the fuel pump control module (if equipped) for proper functionality. Check for manufacturer-spec voltage on its inputs and outputs. Decision Point: If the module is not functioning correctly, replace it. If it operates normally, consider testing the ECM.
Common causes
- Shorted wiring harness to the pump power supply
- Faulty fuel pump control module
- Corroded connectors
- Failed ECM that misreads voltage
Typical repair cost
$$
Related codes
Frequently asked questions
Can I drive with this code active?
Yes, but you might experience poor engine performance and fuel delivery issues, so get it checked soon.
Will this code come back after I clear it?
It can if the underlying issue isn't resolved, so address the wiring and components causing it.
Why does this code show up with other fuel pump codes?
High voltage may indicate the same wiring issue or a common failure point affecting multiple components.
Working a real vehicle right now?
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