Ford Power Stroke · Crankshaft Position Sensor CircuitHigh

Ford Power Stroke P0335: Crankshaft Position Sensor Circuit Malfunction

P-Code P0335 (FMI N/A) — Crankshaft Position Sensor A Circuit Malfunction

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Quick Answer

P0335 means the PCM isn't getting a valid crankshaft position signal, which can cause a no-start or intermittent stalling depending on how the fault presents.

Overview: Ford Power Stroke P-Code P0335

This sensor is critical for injection timing. An intermittent version of this fault causing random stalls is one of the harder diagnoses without a scope capture during the actual event.

Repair Snapshot

Time

1 - 3 Hours

Difficulty

Intermediate

Parts Cost

$80 - $300

Dealer Labor

$350+

Tools Required

  • Multimeter
  • Oscilloscope (if available)
  • Wiring Diagram

What P-Code P0335 Means

P0335 means the PCM isn't receiving a valid crankshaft position signal, which is critical for injection timing and ignition-equivalent timing decisions. This can range from a no-start condition to intermittent stalling depending on how the sensor is failing.

Symptoms Drivers Notice

  • Engine may crank but not start
  • Intermittent stalling while driving if the fault is inconsistent
  • Check engine light
  • Possible rough running just before a full stall

Most Likely Root Causes

Corroded or damaged sensor connector

Common

Poor connection disrupts the signal the PCM relies on for timing.

Excessive air gap or sensor misalignment

Occasional

Reduces signal strength enough to cause dropouts.

Damaged crankshaft target wheel

Rare

Missing or damaged teeth create gaps in the expected signal pattern.

Common Misdiagnoses (Don't Waste Parts)

Replacing the sensor without checking wiring

Why it happens: It's the fastest visible fix.

Do this instead: Check connector and wiring continuity first - many cases are connection issues, not sensor failure.

Giving up on intermittent stalling faults after one test drive

Why it happens: The fault doesn't always reproduce on demand.

Do this instead: Use a data logger or scope capture to catch the fault during an actual stall event.

Master Tech Commentary

Mechanic's Notes

Real-world tip: an intermittent version of this fault that causes random stalling while driving is one of the most frustrating to chase - a scope capture during a stall event is worth far more than a static test.

Step-by-Step Diagnostic Procedure

  1. Step 1: Inspect the crankshaft position sensor connector for corrosion or damage.
  2. Step 2: Check the sensor's air gap to the crankshaft target wheel if adjustable on this platform.
  3. Step 3: Backprobe the sensor signal wire while cranking to check for a valid pulse pattern.
  4. Step 4: Inspect the crankshaft target wheel (tone ring) for damaged or missing teeth.
  5. Step 5: Check wiring continuity from the sensor to the PCM for breaks or shorts.

Live Data & Freeze-Frame Tips

If available, use an oscilloscope to capture the crank sensor signal during a cranking attempt or stall event - a clean, consistent pulse pattern rules out the sensor itself.

Safety Warnings

  • A vehicle that can stall unexpectedly while driving should be diagnosed and repaired promptly before further use in traffic.
  • Disconnect the battery before extensive wiring work.

When to Limp In vs Tow

If the truck is stalling unpredictably while driving, don't continue operating it - tow it rather than risk a stall in traffic.

Prevention Tips for Fleets & Owner-Operators

  • Inspect the sensor connector during routine maintenance.
  • Address any intermittent stalling symptoms immediately rather than waiting for a full failure.
  • Keep connectors protected from underhood moisture.

Related Fault Codes

P0016

Crankshaft/camshaft timing correlation fault that shares related sensor and timing dependencies.

Frequently Asked Questions

Will my truck not start at all with this code?

It can cause a no-start, though some cases present as intermittent stalling instead, depending on how the sensor is failing.

Is this an expensive repair?

Usually not - the sensor itself and related wiring repairs are moderate cost.

Can I drive with this code if the truck still runs?

Not recommended - an unpredictable stall while driving is a real safety concern, so repair it promptly.

How do mechanics diagnose an intermittent version?

By using a scope or data logger to capture the actual signal during the fault event rather than relying on a static bench test.

Can a damaged target wheel cause this?

Yes, though it's less common than a wiring or connector issue - it usually requires more invasive inspection to confirm.