P1391Manufacturer-specific code

P1391 Code: Intermittent Loss of Camshaft or Crankshaft Sensor Signal (Chrysler)

On Chrysler, Dodge, Jeep and Ram, the P1391 code means the camshaft or crankshaft sensor signal is lost intermittently. You may notice jerking. The engine can shut off while you drive.

Severity
High
Can I keep driving?
Yes, but with caution
Estimated cost
$40 to $300
Difficulty
Medium
System
Ignition and Misfires
Applies to
Depends on the manufacturer

Common in: Dodge, Jeep

Updated Reviewed by Renzo Chacca

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What the P1391 code means

P1391 is a manufacturer-specific code: the 1 in the second position means each automaker defines what it stands for, not the generic standard. The most widespread definition is the one used by Chrysler, Dodge, Jeep and Ram. If your vehicle is another brand, confirm the code text with a scan tool that supports that manufacturer.

ManufacturerMeaning of P1391
Chrysler, Dodge, Jeep and RamIntermittent loss of camshaft or crankshaft sensor signal

The computer needs the signals from the crankshaft and camshaft sensors to time the ignition and injection.

The computer sets the P1391 code when one of the two signals is lost intermittently. It can shut the engine off while you drive.

Before you repair anything, confirm the make, model, year and engine. With manufacturer codes, the same number can change even between engines from the same brand.

P1391 code symptoms

  • The engine shuts off while driving and starts again.
  • Jerking.
  • Tachometer that drops to zero.

Likely causes of the P1391 code

  1. Crankshaft sensor. Very common.
  2. Camshaft sensor. Confirm it by comparing its reading with the actual value.
  3. Connectors with oil or corrosion.
  4. Wiring near the exhaust. Look for rubbing against the engine, the chassis or the exhaust.

How to diagnose the P1391 code step by step

  1. Graph both signals with the engine running.
  2. Check the connectors and the wiring with a wiggle test.
  3. Measure the sensor air gap.

How to fix the P1391 code

  • Replace the sensor that fails.
  • Repair the wiring, then clear the P1391 code and confirm the signals stay steady on a test drive.

Technical reference data

  • Many Chrysler sensors are Hall effect types with a 5 or 8 V supply.
  • P1xxx codes are manufacturer-specific: confirm the definition with a scan tool that supports your brand.
  • Values are approximate: check the manufacturer data for your vehicle.

Brand-specific notes

Very common on the Jeep Grand Cherokee, Wrangler, Dodge Neon and Caravan.

If your vehicle is another brand, check the table above for the meaning its manufacturer gives the code, and confirm it with a scan tool that supports that brand.

Frequently asked questions about P1391

What does the P1391 code mean on a Chrysler?
It means the camshaft or crankshaft sensor signal is lost intermittently. You may notice jerking, and the engine can shut off while you drive.
Does P1391 mean the same thing on every brand?
No. It is a manufacturer code, and on other brands it may not exist or it may mean something else.
Can I drive with a P1391 code?
With caution. The engine can shut off while driving, and you lose power steering assist and brake boost, so repair it soon.
How much does it cost to fix P1391?
On a Chrysler product the cost runs from about $40 to $300. A wiring or connector repair is on the low end, while a new crankshaft sensor with labor costs more.
Will a P1391 code clear itself?
Not for long. An intermittent sensor or wiring fault tends to come back, often when the engine is hot, until the cause is repaired.
What is the most common cause of P1391?
The crankshaft position sensor. Camshaft sensors, oily or corroded connectors and wiring near the exhaust are the next suspects.

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Questions about the P1391 code

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