P0339: Crankshaft Position Sensor A Circuit Intermittent

What does P0339 mean?

P0339 means the crankshaft position signal drops out or is disturbed for moments and then recovers. Ford's 2020–2023 petrol engines use it, depending on the engine, instead of P0320 for tooth errors: wrong tooth count after the gap, tooth time outside 30 to 9,000 rpm, gap at an unexpected position, from 500 rpm, detected within 5 s. In Ford's PCM code list (Roush workshop manual) P0339 is listed without check engine light. Saab's 9-3 diesel (T8) counts dropouts: more than 8 within 10 ms over 3 s, or more than 3 in a whole drive cycle. Honda recalled 2023 Accord Hybrids because a mis-machined sensor mounting caused no-start, rough idle, hunting idle and P0017 with P0339. Typical causes are a loose contact, a sensor failing when hot and a wrong air gap.

The code tells you which monitor failed, not which part is broken. Test before replacing parts.

Symptoms

• Sporadic jerking or misfire
• Brief stalling, hunting idle
• Hard starting
• Check engine light on (not on all Ford engines)

Common causes

• High Loose contact or corrosion at the sensor connector or an in-line connector
• Medium Sensor dropping out when hot
• Medium Sensor mounting or air gap mechanically wrong (machining error, bracket)
• Low Electrical interference
• Low Tone wheel slightly damaged

Likelihood is a general estimate across vehicles; your make and model may differ.