Crankshaft Position Sensor Circuit Malfunction
The crankshaft position sensor is not working correctly.
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What it means (plain English)
The crankshaft position sensor reads the position and speed of the crankshaft to help the engine control module (ECM) manage fuel injection and ignition timing. If it's faulty, the engine may not run correctly or may not start at all.
What the computer is actually seeing
The ECM expects a regular sinusoidal signal from the crankshaft position sensor that fluctuates between 0.5V to 5V as the crankshaft rotates. A missing signal will lead to an error code being set.
What a healthy reading looks like
Normal crankshaft position sensor operation should show a voltage signal that fluctuates between 0.5V and 5V. A stable voltage outside this range indicates a problem.
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 connector at the crankshaft position sensor for damage or corrosion. If found, repair or replace as necessary. Decision: If bad, fix and retest. If good, proceed to step 2.
- 22. Measure voltage at the crankshaft position sensor while cranking the engine. You should see a fluctuating voltage between 0.5V and 5V. Decision: If voltage is within range, suspect ECM. If no voltage, suspect sensor or wiring issue. Proceed to step 3.
- 33. Swap the crankshaft position sensor with a known good one if available. Recheck voltage. Decision: If code returns, suspect ECM. If code clears, replace the crankshaft position sensor.
Common causes
- Disconnected or damaged wiring to the crankshaft position sensor
- Faulty crankshaft position sensor
- Bad ECM or software issue
- Timing belt/chain issues affecting sensor placement
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
No, it can cause engine stalling or no-start conditions.
Will this code come back after I clear it?
Yes, if the underlying issue is not fixed, the code will likely return.
Why do I see this code along with SPN 0313?
SPN 0313 (Engine Speed Signal) is related because both codes involve the crankshaft position sensor.
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