2005 Mercury P0335: What It Means & Is It Safe to Drive?

P0335 on the 2005 Mercury: Crankshaft Position Sensor A Circuit Malfunction. Here's what it means, what usually causes it, what repairs typically cost, and whether it's safe to keep driving.

PowertrainHigh urgency

What this code means

The PCM is not receiving the expected signal from the crankshaft position sensor (CKP). This sensor tells the ECM the exact position and speed of the crankshaft. Without it, the engine may not start or will stall and run poorly.

Common causes on the 2005 Mercury

  • Failed crankshaft position sensor
  • Damaged or corroded sensor wiring/connector
  • Tone ring (reluctor wheel) damage or debris
  • Failed PCM (rare)

Symptoms

  • Engine won't start or stalls unexpectedly
  • Check Engine Light on
  • Engine cranks but will not fire
  • Intermittent stalling at speed

Typical fixes

  • Replace crankshaft position sensor
  • Inspect and repair wiring harness and connector
  • Check tone ring for damage or packed debris

Repair cost range

For a 2005 Mercury, repairs for P0335 typically fall between $100 and $350, depending on the root cause and labor rates in your area.

Is it safe to keep driving your 2005 Mercury with this code?

For driving-safety guidance—how far you can go, when to tow, and what's urgent—see these checklists:

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