P0339: Crankshaft Position Sensor A Circuit Intermittent
Can you still drive? Drive with caution. The engine could stall without warning. Carry a phone for emergencies and avoid high-speed driving.
What Does P0339 Mean?
Code P0339 means the ECM has detected an intermittent signal from the crankshaft position sensor. The signal may drop out momentarily or produce irregular patterns. This is often harder to diagnose than a complete sensor failure because the problem may not be present during testing.
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Browse OBD-II Scanners on AmazonCommon Causes
- Loose or intermittent sensor connector
- Cracked sensor causing thermal sensitivity
- Damaged reluctor ring with subtle defects
- Wiring with intermittent break
- Sensor air gap too wide
Symptoms
- Check engine light on
- Intermittent stalling
- Momentary power loss while driving
- Hard starting sometimes
- Engine stumble at certain RPMs
Diagnostic Steps
- 1Wiggle-test sensor connector and wiring while monitoring signal
- 2Inspect reluctor ring with a borescope for hairline cracks
- 3Monitor crank sensor signal with an oscilloscope during a test drive
- 4Check sensor connector pins for backed-out or spread terminals
- 5Heat-test the sensor with a heat gun while monitoring output
Recommended Parts & Tools
crankshaft position sensor
electrical connector repair kit
Estimated Repair Cost
| Type | Estimated Cost |
|---|---|
| Total Repair Cost Range | $75 - $400 |
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Chat with AI About P0339Commonly Affected Vehicles
Related Recalls
2 Active Recalls — 2026 Jeep Grand Cherokee
The following NHTSA safety recalls have been issued for this vehicle. Contact your dealer to check if your vehicle is affected.
ELECTRICAL SYSTEM:PROPULSION SYSTEM
Chrysler (FCA US, LLC) is recalling certain 2022-2026 Jeep Grand Cherokee Plug-In Hybrid Electric (PHEV) vehicles. A software error within the hybrid control processor may result in a loss of drive power.
Remedy: Dealers will update the hybrid control processer software, free of charge. Owner notification letters were mailed October 14, 2025. Owners may contact Chrysler customer service at 800-853-1403. Chrysler's number for this recall is 73C. Vehicle Identification Numbers (VINs) involved in this recall will be searchable on NHTSA.gov beginning September 11, 2025.
ELECTRICAL SYSTEM:PROPULSION SYSTEM:TRACTION BATTERY
Chrysler (FCA US, LLC) is recalling certain 2020-2025 Jeep Wrangler 4Xe and 2022-2026 Grand Cherokee 4Xe vehicles. The high voltage battery may fail internally and lead to a vehicle fire while parked or driving.
Remedy: Owners are advised to park outside and away from structures and not to charge their vehicles until the remedy is completed. Dealers will update the high voltage battery software, and replace the high voltage battery, as necessary, free of charge. Some owner notification letters were mailed beginning December 17, 2025. The remaining owner notification letters will be mailed at a later date. Owners may contact Chrysler customer service at 800-853-1403. Chrysler's number for this recall is 68C. Vehicle Identification Numbers (VINs) involved in this recall will be searchable on NHTSA.gov beginning November 6, 2025. Vehicles that were previously recalled for the same issue under NHTSA Recalls 24V720 and 23V787 will need to have the new remedy performed.
Data provided by the National Highway Traffic Safety Administration (NHTSA).
Frequently Asked Questions
Why is an intermittent crank sensor hard to diagnose?
Because the fault may only occur under specific conditions like heat, vibration, or certain engine speeds. Standard resistance tests may show normal readings when the sensor is cold.
Should I just replace the sensor if P0339 appears?
Replacing the sensor is a reasonable first step since it's relatively inexpensive. However, check the wiring and connector first, as those are equally common causes.
Community Fix Reports
Community reports are user-submitted and not verified by Auto AI Buddy. Results may vary.
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