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P1391 OBD2 Diagnostic Code in 2000 Dodge Grand Caravan: What Part Is Needed?

Model: 2000 Dodge Grand Caravan Fault Code: P1391 Posted: 2008-09-19 13:32

I'm experiencing a P139-1 diagnostic trouble code on my 2000 Dodge Grand Caravan, and I believe this is the root cause of the vehicle's performance issues. After researching online forums, I've confirmed that this code often relates to transmission or engine sensor problems. However, when I searched for the part called 'flex plate' at dodgeparts.com, it wasn't available. Could someone clarify what component I should actually be looking for? Is 'flex plate' the correct term, or is there a more accurate name used in service manuals?

Related fault codes
P1391
Comments (2)
Anonymous 2008-09-19 15:18

Service manuals and parts catalogs may refer to the same part using different terminology. Double-check your search terms—sometimes the correct part is called a 'drive plate' instead of a flex plate.

Anonymous 2013-10-21 12:05

I have a 2000 Dodge Grand Caravan with the same P1391 code. I've gone through several troubleshooting steps including replacing the crankshaft and camshaft position sensors, fuel pump, coil pack, and even considered the TPS (throttle position sensor) due to its age. A garage mechanic suggested it might be a failing TPS, but that repair cost only $10—far less than the $600+ for transmission work. I later consulted another mechanic, my coworker's son, who pointed out the possibility of a faulty auto shutdown relay. I also noticed corrosion on the wire leading to the fuse box under the hood. After replacing both relays and cleaning the corroded wire, the vehicle ran smoothly with no more stalling or skipping. Additionally, I found that the PVC (positive crankcase ventilation) hose was cracked, which directly caused stalling issues. I had planned to replace a flex plate, but after these fixes, the problem resolved itself. This experience shows that the P1391 code may not always point to a transmission part—sometimes it's related to electrical systems or vacuum components. Hope this helps others facing similar issues.