P0339: Crankshaft Position Sensor A Circuit Intermittent
Severity: high
What it means: The PCM saw an intermittent crankshaft position signal — the engine speed signal dropped out briefly.
Safe to drive? Can stall without warning. Limit driving until repaired.
Common symptoms
- Intermittent stall
- Crank/no-start that later works
- Sometimes no CEL between events
Likely causes, ranked
- Failing crankshaft position sensorDIY
- Damaged sensor pigtail/connectorDIY
- Wiring to the PCMShop
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Vehicle-specific notes
- 2012–2018 Jeep Wrangler: JK owners on Wrangler Forum fixed no-code intermittent stalls with the crank sensor and sometimes its pigtail on the bellhousing. Read the full answer · Source
What it means: The PCM saw an intermittent crankshaft position signal — the engine speed signal dropped out briefly.
Severity: High. Safe to drive? Can stall without warning. Limit driving until repaired.
DIY or shop?
DIY sensor/pigtail on many Jeep JK applications; use quality parts.
Before you replace parts
- Read all stored codes and freeze-frame data, not just this one.
- Check your VIN for recalls, service bulletins and extended coverage.
- Inspect wiring and connectors for the related sensor or part before buying parts.
- Clear the code only after a repair, then confirm it stays off.
Safety / mechanic note
Verify with a mechanic. Intermittent crank signal can shut the engine off in traffic. A code points to a circuit or system, not always a specific part.
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