P0335 on Ford
Crankshaft Position Sensor A Circuit Malfunction
P0335 on Ford vehicles indicates crankshaft position sensor a circuit malfunction. Au7o has documented this code across 1 Ford model — most commonly on EcoSport. This code means the engine computer has lost or detected a faulty signal from the crankshaft position sensor (sensor A), which tells the computer exactly how fast and in what position the crankshaft is rotating. That signal is essential for timing the spark and fuel injection, so a problem here can cause hard starting, stalling, or a no-start condition. The computer sets this code when the crank sensor signal is missing, erratic, or out of its expected pattern. Causes range from a failed sensor or damaged wiring to a problem with the reluctor (tone) ring the sensor reads. Typical repair costs on Ford range from $250 to $600, depending on the specific model and root cause.
Common Causes of P0335
- •Failed crankshaft position sensor
- •Damaged, corroded, or loose sensor wiring/connector
- •Metal debris or oil contamination on the sensor tip
- •Damaged or misaligned reluctor (tone) ring
- •Excessive air gap between sensor and tone ring
- •Wiring shorted or open in the sensor circuit
- •Faulty PCM/ECM (rare)
P0335 on Ford by Model
Ford EcoSport(1 issue)
- Auto Start-Stop Shuts the Engine Down and Fails to Restart in Traffic2018-2022
Owners report the Auto Start-Stop system killing the engine at traffic lights, at low speed and mid-turn, and then failing to restart — leaving the vehicle dead in a live traffic lane. A related and sometimes identical-looking complaint is a wholesale loss of electrical power while driving, with the cluster lighting up with oil pressure, ABS, check-engine and charge warnings at once before the engine dies. Dealer findings have pointed at the battery and battery monitoring sensor (Start-Stop depends on the BMS correctly modelling state of charge, so a marginal battery causes both misbehaviour and failed restarts), at loose electrical wiring and connectors, and in some cases at the crankshaft position sensor. Multiple owners report repeat visits without a durable fix, including cars that stalled again after a battery replacement and recalibration. Note that a stall accompanied by an oil-pressure warning on a 1.0L car is the oil-pump-belt failure signature and must be investigated as an engine failure, not as a Start-Stop fault.
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View P0335 across all makes →Frequently Asked Questions
What does P0335 mean on Ford?▼
P0335 stands for "Crankshaft Position Sensor A Circuit Malfunction." This code means the engine computer has lost or detected a faulty signal from the crankshaft position sensor (sensor A), which tells the computer exactly how fast and in what position the crankshaft is rotating. That signal is essential for timing the spark and fuel injection, so a problem here can cause hard starting, stalling, or a no-start condition. The computer sets this code when the crank sensor signal is missing, erratic, or out of its expected pattern. Causes range from a failed sensor or damaged wiring to a problem with the reluctor (tone) ring the sensor reads. On Ford specifically, this code is documented across 1 model.
What causes P0335 on Ford vehicles?▼
Common causes on Ford: Failed crankshaft position sensor, Damaged, corroded, or loose sensor wiring/connector, Metal debris or oil contamination on the sensor tip, Damaged or misaligned reluctor (tone) ring, Excessive air gap between sensor and tone ring. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0335 on a Ford?▼
Repair costs on Ford range from $250 to $600, depending on the specific model and root cause.
Which Ford models have P0335 documented?▼
Au7o has documented P0335 on 1 Ford model: EcoSport.