Engine

P033F — Crankshaft/Camshaft Loss of Synchronization

Severity: medium Drive with care, to a shop

What P033F means

The engine control module compares the crankshaft position sensor signal with the camshaft position sensor signal to know which cylinder is on which stroke, so it can time fuel and spark. P033F sets when those signals are missing, noisy, or out of step. Definitions vary by manufacturer, so brand-specific data matters.

Symptoms

  • Check Engine light on
  • Rough idle
  • Misfires or hesitation
  • Hard starting or no start
  • Reduced power
  • Poor fuel economy

Possible causes

  1. Failing crankshaft position sensor
  2. Failing camshaft position sensor
  3. Damaged wiring or poor connector contact, open circuit or short to ground
  4. Stretched timing chain or belt, or jumped timing
  5. Damaged or dirty reluctor/tone wheel on the crank or cam
  6. ECM fault (uncommon)

How to diagnose

  1. Read all codes and freeze-frame data, and look for related misfire or sensor codes
  2. Inspect crank and cam sensor connectors and wiring for corrosion, chafing, or oil contamination
  3. Test sensor power, ground, and signal with a multimeter or scope
  4. Compare crank and cam waveforms during cranking and at idle
  5. Inspect sensors and tone wheels for damage, metal debris, and proper air gap
  6. Verify timing marks and chain/belt condition, and check cam phasing corrections for chain stretch
  7. If everything checks out, look for ECM software updates and test the module

Common fixes

  • Replace the crankshaft position sensor
  • Replace the camshaft position sensor
  • Repair wiring and connectors
  • Replace the timing chain or belt, or set timing correctly
  • Replace a damaged tone wheel
  • Reflash or replace the ECM

P033F on different brands

Ford · manuals
For its 2024–2025 gasoline engines, Ford documents P033F:00 as a noisy crank sensor with no cam/crank synchronization; it describes the detected monitor condition, not a confirmed failed part.

Questions and answers

What does P033F mean?

The ECM can't match the crankshaft and camshaft signals, or it sees an unstable crank signal. Common causes are a sensor, wiring, or timing misalignment.

Can I drive with P033F?

Only briefly, and only if the engine runs smoothly. If it misfires, stumbles, or is hard to start, have it towed to avoid catalytic converter or engine damage.

Will replacing the crankshaft sensor fix it?

Not always. Check the wiring, connectors, tone wheel, and timing marks first, or the code will likely return.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.