Question

1999 Dodge Dakota 3.9L 4x4 5 speed with engine code P1391 what is the meaning? what does this code mean?

Answer 1

Hi there,

This code means there is an intermittent loss of cam or crank signal. There are several possible causes. Check the engine grounds on the firewall. They tend to rust off and cause intermittent problems like this. Here is the list of other possible causes:

POSSIBLE CAUSES 

• No problem found
• Camshaft position sensor defective
• CKP improperly installed
• CKP sensor connector observable defect
• CKP sensor connector terminal(s) observable def
• CKP sensor signal circuit wiring harness intermittent defect
• CMP & CKP wiring harness intermittent defect
• CMP sensor connector observable defect
• CMP sensor connector terminal(s) observably def
• CMP sensor signal ckt wiring harness inter def
• PCM black connector observable defect
• Crankshaft position sensor defective
• Distributor position not in range
• Flywheel defective
• Rotor or rotor drive system loose
• PCM connector terminal(s) obser def (CKP sensor)
• PCM connector terminal(s) obser def (CMP sensor)

Answer 2

P1391 DODGE Code - CMP or CKP Signal Intermittent Condition
Read more: https://www.autocodes.com/p1391_dodge.html