Ignition Switch Circuit Low Voltage
The vehicle's computer detected low voltage in the ignition switch 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)
When you turn the key, the ignition switch isn't sending enough power to wake up the rest of the electrical system. It should be around 12 volts when on, but you're getting less.
What the computer is actually seeing
The computer monitors the voltage in the ignition switch circuit. If it detects voltage lower than approximately 9 volts while the key is in the 'run' position, it triggers this code.
What a healthy reading looks like
Expected voltage at the ignition switch circuit should be between 9 to 12 volts with the ignition key in the 'run' position.
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 battery voltage; it should be at least 12.4 volts with the engine off. If it's below this, charge or replace the battery.
- 22. Inspect the ignition switch wiring and connectors for loose, corroded or damaged connections. Repair as needed.
- 33. With the ignition on, use a multimeter to measure the voltage at the ignition switch. It should read between 9 to 12 volts. If not, replace the ignition switch.
- 44. Check fuses and relays that power the ignition circuit; replace any blown fuses or faulty relays.
- 55. If issues persist after all checks, consider further diagnostics to check for a hidden short or fault elsewhere in the ignition system.
Common causes
- Faulty ignition switch
- Bad wiring or loose connections in the ignition circuit
- Weak battery or poor battery connections
- Damaged or corroded connectors
- Faulty power relay or fuse related to the ignition system
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive, as it can affect engine start and other electronics.
Will this code come back after clearing it?
If the underlying issue is not fixed, yes, it will likely return.
Why does this code appear with other codes like B1561?
Codes like B1561 can indicate related problems in the ignition circuit, often stemming from a common cause.
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