P1391 on Dodge: How to Diagnose & Fix
Loss of Cam/Crank Position Sensor Signal — Intermittent Condition
1 Dodge model · 1 documented issue · $100-$300 repair
P1391 on Dodge by model: symptoms, diagnosis and fix
The Hall-effect camshaft and crankshaft position sensors (and their connectors) on Intrepid engines degrade with heat and fail intermittently, cutting spark and fuel without warning. Owners report sudden stalling while driving, engines that die after warming up and restart once cooled, and intermittent crank-but-no-start conditions. Chrysler addressed start/stall and no-start conditions in service bulletin coverage (SB 195966, May 1999), and the same defect is documented across the LH platform including the Chrysler Concorde.
Common Symptoms
- Engine stalls suddenly while driving, then restarts after cooling down
- Intermittent crank-but-no-start, especially when hot
- Stumbling, jerking, or engine misses under load
- Check engine light with cam/crank sensor codes
- Tachometer drops to zero just before the stall
How to Fix
Replace the failed camshaft and/or crankshaft position sensor and inspect the connector and wiring for heat damage; many shops replace both sensors together since they fail similarly. It is an inexpensive bolt-in repair once correctly diagnosed.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Mopar 4609086AF camshaft-position sensor
Replace only when scope/scan testing confirms cam-sensor or circuit failure Fitment: Confirm exact year/engine; the 1993-2004 issue span does not use one cam sensor Live OEM direct product page when checked
- Mopar 4609009 crankshaft-position sensor
Replace a failed crank sensor after heat-related signal loss is reproduced Fitment: Use only for catalog-confirmed engine/year applications Live OEM direct product page when checked
- Mopar 4727451AA crankshaft-position sensor
Alternate engine/year sensor branch Fitment: Confirm installed engine and connector before purchase Live OEM direct product page when checked
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Sources for this issue (1)
P1391 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P1391 mean on a Dodge?
P1391 stands for "Loss of Cam/Crank Position Sensor Signal — Intermittent Condition." P1391 is a manufacturer-specific code used primarily by Chrysler, Dodge, and Jeep indicating an intermittent loss of signal from the camshaft position (CMP) sensor or crankshaft position (CKP) sensor. The PCM uses these signals to determine engine timing for ignition and fuel injection, so a dropout can cause hesitation, stalling, or a no-start condition. Note that on a few other makes (e.g., some Chevrolet/GM applications) P1391 can instead refer to a wheel-speed/G-sensor circuit fault. On Dodge it is documented across 1 model: Intrepid.
What are the most common causes of P1391?
The most common causes of P1391 are: Failing crankshaft position (CKP) sensor — often drops out when hot, then recovers when cool, Failing or intermittent camshaft position (CMP) sensor, Damaged, corroded, or loose sensor wiring/connectors or a poor ground, Low-quality aftermarket (non-OEM) cam/crank sensor causing the code to return after repair, Damaged tone/reluctor wheel teeth on the crankshaft, camshaft, or flexplate, Intermittent open or short in the sensor signal circuit to the PCM. The specific cause varies by vehicle.
How much does it cost to fix P1391 on a Dodge?
Published repair estimates on Dodge range from $100 to $300 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P1391 on a different make?
View P1391 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.