Engine Speed Data Invalid
The engine control module has detected invalid engine speed data.
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 computer thinks the engine is not running at the correct RPM based on the sensors, which might be caused by a bad signal or wiring issue.
What the computer is actually seeing
The Engine Control Module (ECM) expects a specific range of signals (usually from 0 to 5000 RPM) from the crankshaft position sensor or other speed sensors, but gets data that falls outside this range or is missing altogether.
What a healthy reading looks like
Engine speed should be within 600 RPM to 2500 RPM during idle, and 700 RPM to 3000 RPM during acceleration.
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 to the crankshaft position sensor for damage or corrosion. Repair as needed. Decision: Are connectors intact? Yes - Proceed to next step; No - Repair wiring/connectors.
Common causes
- Faulty crankshaft position sensor
- Damaged wiring or connectors in the speed sensor circuit
- Faulty ECM or software issues
- Faulty throttle position sensor affecting RPM reading
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best to diagnose and fix it soon as it may affect engine performance.
Will this code come back after clearing?
If the underlying issue isn't fixed, it's likely to return.
Why does this code pair with other SPNs?
They often relate to the same sensors or circuits affecting engine speed.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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