Engine Speed Signal Not Received
The engine control module isn't receiving the expected engine speed signal.
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 depends on the crankshaft position sensor to figure out how fast the engine is spinning. If it can’t see that signal, it can’t manage things like fuel delivery correctly.
What the computer is actually seeing
The engine control module checks for engine speed at regular intervals. When it doesn't get a valid signal from the crankshaft position sensor, it will trigger this code, usually within a few seconds of initiating an engine start or acceleration.
What a healthy reading looks like
Expected engine speed signal should be around 600-800 RPM at idle and can vary widely during acceleration. Sensor should send a square wave signal with a frequency corresponding to the engine speed.
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. Visually inspect the wiring and connectors for the crankshaft position sensor. Check for any damaged wires or loose connections. If found, repair or replace as needed.
- 22. Test the crankshaft position sensor with a multimeter. You should get a voltage output of 0.5V-2.5V under normal conditions. If no signal, replace the sensor.
- 33. If the sensor tests good, check the ECM. Use a scan tool to verify it’s detecting RPMs. If the ECM isn’t responding, replace it.
- 44. If all else fails, check for other engine-related issues like timing belt/chain alignment if installed incorrectly may lead to sensor misreads.
Common causes
- Faulty crankshaft position sensor
- Wiring issues or damaged connectors to the crankshaft position sensor
- Faulty engine control module (ECM)
- Improperly installed or damaged timing components
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with SPN 207 active?
No, it’s not safe to drive because the vehicle may stall or not restart due to lack of engine speed feedback.
Will this code come back after clearing?
It can come back if the underlying issue isn't fixed, like a faulty sensor or bad connection.
Why does this code trigger alongside others like SPN 100?
SPN 100 relates to the same engine speed signal issues; both codes are symptoms of the same problem.
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