Engine Shutdown Switch
Indicates an issue with the engine shutdown switch.
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 shutdown switch is supposed to stop the engine if it detects a problem. When it registers a fault, it means it’s either not working correctly or there's a wiring issue preventing it from doing its job.
What the computer is actually seeing
The computer sees a signal from the engine shutdown switch that's either consistently off when it should be on, or there's a voltage reading that doesn't match expected ranges.
What a healthy reading looks like
The shutdown switch should show a voltage of approximately 0V (off) or around 5V (on) when activated. Conditions should evaluate within a tolerance of 0.5V.
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 wiring and connectors at the engine shutdown switch for damage or corrosion. Decision: If damaged, repair or replace.
- 22. Check the engine shutdown switch with a multimeter. When the switch is activated, you should see a change from 0V to around 5V. Decision: If no change, replace the switch.
- 33. Verify the control module is receiving the expected voltage on its input pin for the shutdown switch. It should read close to 5V. Decision: If not, check wiring back to the module; if wiring is good, consider module repair or replacement.
Common causes
- Faulty engine shutdown switch
- Wiring issues or short circuits
- Poor connections at the module or sensor
- Corrosion in connectors
- Control module failure
Typical repair cost
$$$
Related codes
Frequently asked questions
Can I still drive the vehicle?
Not recommended. If this switch malfunctions, the engine could shut off unexpectedly.
Will this code come back after I clear it?
Yes, if the underlying problem isn't fixed, the code will likely return.
Why does this often pair with SPN 1490?
SPN 1490 indicates a related issue with the engine shutdown switch circuit, making them common to see together.
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