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Code P1391, engine hesitation and tachometer drop when shifting?

Tiny
NASHNICK
  • MEMBER
  • 2001 DODGE CARAVAN
  • 3.3L
  • 6 CYL
  • AUTOMATIC
  • 232,025 MILES
Engine hesitation and tach drop when shifting between 20 and 25 MPH and 40-45 MPH. Is it camshaft or crankshaft or both or neither? Runs good otherwise. Starts, no backfire. Check engine light comes on but is off the next morning.
Thursday, November 7th, 2024 AT 7:27 AM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
I would do the crankshaft sensor first, here is the location of the sensor so you can swap it out, clear the codes once completed.

The P1391 code on your 2001 Dodge Caravan indicates an "Intermittent Loss of CMP (Camshaft Position Sensor) or CKP (Crankshaft Position Sensor) Signal."

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Thursday, November 7th, 2024 AT 6:25 PM
Tiny
NASHNICK
  • MEMBER
  • 1 POST
A mechanic told me he thinks the transmission is going out and sensors won't help. What's your opinion/advice?
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Saturday, November 9th, 2024 AT 5:53 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
That could be, but the code is for the crankshaft sensor. You might have two problems.
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Sunday, November 10th, 2024 AT 9:01 AM

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