P0336 on the 6.4L Power Stroke indicates a range or performance problem with the crankshaft position (CKP) sensor signal. This sensor is critical for engine timing and fuel injection, so a fault can cause hard starting, stalling, or a no-start. This guide explains what P0336 means on the 2008-2010 6.4L and how to track down the cause.
What P0336 means
P0336 is "Crankshaft Position Sensor A Circuit Range/Performance." The PCM uses the CKP signal to determine engine speed and crank position for injection and timing. When the signal is erratic, has missing pulses, or does not agree with the camshaft position signal, the PCM sets P0336. On the 6.4L, this can result from a failing sensor, a damaged reluctor or tone ring, or wiring issues.
Common causes
- A failing or heat-damaged crankshaft position sensor
- Damaged reluctor / tone ring teeth
- Metal debris on the sensor tip
- Wiring or connector faults at the sensor
- Excessive air gap or a loose sensor
- Correlation problems with the camshaft position sensor
Symptoms
- Check engine light with P0336 stored
- Hard starting or intermittent no-start
- Stalling, especially when hot
- Rough running or misfire feel
- Reduced power
- Related crank/cam correlation codes
How to diagnose it
Scan all codes and check whether the fault is intermittent, which points to a heat-sensitive sensor or connection. View engine rpm in live data during cranking and running to see if the signal drops out. Inspect the CKP sensor, its connector, and wiring for damage, corrosion, and heat exposure. Remove and inspect the sensor tip for metal debris, and check the reluctor ring for damaged teeth. Verify the sensor is properly seated with the correct air gap. Compare crankshaft and camshaft signals to check for correlation problems.
How to fix it
Replace a failed or heat-damaged CKP sensor with a quality part and repair any wiring or connector faults. Clean debris from the sensor tip and ensure it is seated correctly. If the reluctor ring is damaged, that must be addressed as well. After the repair, clear the code and verify a stable rpm signal during cranking and running, along with a successful hot restart, to confirm P0336 does not return.
FAQ
Can P0336 cause a no-start?
Yes. If the PCM loses a reliable crank signal, the engine may crank but not start, or may stall unexpectedly.
Why does the problem happen when hot?
Crank sensors can fail intermittently as they heat up, so a hot-only stall or no-start commonly points to a heat-sensitive sensor.
Do I need to check the tone ring?
If the sensor and wiring are good, inspect the reluctor ring for damaged teeth, since that can also cause range/performance faults.
Need parts to fix this code? The team at sales@coredieselparts.com can match the correct sensor, injector, or emissions component to your engine and model year.
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