P0339 on Jeep
Crankshaft Position Sensor A Circuit Intermittent
P0339 on Jeep vehicles indicates crankshaft position sensor a circuit intermittent. Au7o has documented this code across 1 Jeep model — most commonly on Wrangler. The crankshaft position (CKP) sensor 'A' signal is intermittent, dropping in and out. The controller intermittently loses the crank reference, typically causing random stalls or no-restart events that are hard to reproduce. Often a loose connector, marginal sensor, or chafed wire. Typical repair costs on Jeep range from $60 to $250, depending on the specific model and root cause.
Common Causes of P0339
- •Intermittent wiring or loose/corroded connector
- •Heat-sensitive or marginal CKP sensor
- •Variable air gap from a loose sensor
- •Damaged/chafed harness
- •Reluctor ring runout
P0339 on Jeep by Model
Jeep Wrangler(1 issue)
- 4.0L Crankshaft Position Sensor Thermal Failure — Random Stalling & Hot No-Start1997-2006
The crankshaft position sensor (CPS) on the 4.0L (and 2.5L) inline engines mounts on the transmission bellhousing and is exposed to severe heat soak. As it ages it develops intermittent thermal failure: the engine stalls without warning once hot, then refuses to restart until it cools, after which it runs fine again — a maddening, hard-to-replicate fault. Frequently the CPS fails with NO check-engine light and NO stored code, so it is commonly misdiagnosed. It is a top-searched TJ/early-Wrangler stalling complaint and a roadside-safety concern because the stall is sudden.
Looking for P0339 on a different make?
View P0339 across all makes →Frequently Asked Questions
What does P0339 mean on Jeep?▼
P0339 stands for "Crankshaft Position Sensor A Circuit Intermittent." The crankshaft position (CKP) sensor 'A' signal is intermittent, dropping in and out. The controller intermittently loses the crank reference, typically causing random stalls or no-restart events that are hard to reproduce. Often a loose connector, marginal sensor, or chafed wire. On Jeep specifically, this code is documented across 1 model.
What causes P0339 on Jeep vehicles?▼
Common causes on Jeep: Intermittent wiring or loose/corroded connector, Heat-sensitive or marginal CKP sensor, Variable air gap from a loose sensor, Damaged/chafed harness, Reluctor ring runout. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0339 on a Jeep?▼
Repair costs on Jeep range from $60 to $250, depending on the specific model and root cause.
Which Jeep models have P0339 documented?▼
Au7o has documented P0339 on 1 Jeep model: Wrangler.