P1391 on 1993-2004 Dodge Intrepid — Loss of Cam/Crank Position Sensor Signal — Intermittent Condition
1 vehicles · 1 makes · $100-$300 repair
Most Reported On
P1391 is an OBD-II diagnostic trouble code meaning “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. This code is most commonly reported on 1993-2004 Dodge Intrepid, with repair costs ranging from $100 to $300.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P1391, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
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BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
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LAUNCH CRP123X OBD-II Scanner
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A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
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Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
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- Oil reset, EPB, BMS, TPMS, injector coding
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FAQ
What does P1391 mean?
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.
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?
Repair costs for P1391 range from $100 to $300, depending on the vehicle and root cause.
Which vehicles are affected by P1391?
Au7o has documented P1391 across 1 vehicle models from 1 manufacturers: Dodge.
Sources (4)
- articleDamaged Cam Position Sensor May Cause Engine Problems: Dodge Intrepid (RepairPal, 93 reports)
- articleStarting Issues and Trouble Code Due to Defective Cam/Crankshaft Sensor: Dodge Intrepid (RepairPal, 34 reports)
- ForumCamshaft Position Sensor on a 2.7, jerking engine miss — DodgeIntrepid.Net Forums
- Forumseeking help w/ Cam Position Sensor diagnosis — DodgeIntrepid.Net Forums
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.