Question about 2005 Dodge Magnum
PCM stands for 'Powertrain Control Module'. It is an automotive component, an electronic control unit used on motor vehicles.
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Posted on Nov 06, 2012
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Posted on Jan 02, 2017
SOURCE: 1999 Dodge Caravan posts trouble
The p1698 code is for the (bus) that is how the computers commmunicate with each other and also how the scan tool talks to the computers.
There is a common problem with these vans, that would be a good place to start. The battery will leak acid onto the wires underneath the battery. If you remove the battery and battery tray you will be able to see the large wiring harness under the battery. Inspect all of the wires underneath the battery for damage.
Posted on Aug 30, 2008
could be a bad pcm, but a shorted or open bus wire is also possible. this kind of diagnosis is very time consuming chasing wires and would best be done with a shop manual with wiring diagrams and flow charts
Posted on May 12, 2009
The PCM is located on the fender well in the back of the engine compartment close to the firewall. It is a gray rectangle about 7" x 5". It is ribbed. It attaches using three screws.
It is also located close to heater core parts of your truck. If your overheating problem is related to the heater core, it may in fact be causing the PCM to everheat, though I've never heard of it happening before.
Posted on Aug 24, 2009
Testimonial: "thanks for the info.."
2001 Dodge Caravan died warming up in the driveway last weekend. Turned the key and no engine cranking. Lights on the dash all lit and completed internal diagnostics normally. Keyless entry worked and the battery seemed OK. On closer inspection there was no clicking from the starter that would indicate a weak battery, nor were there any Diagnostic Trouble codes (DTC's) set by the computer (PCM) -I have a scan tool. Checked fuses and relays with volt meter in the realy center next to the PCM. By by following the schematic (using a Haynes manual) I was able to supply battery to the starter (the engine cranked just fine) and the fuel pump (it ran).
On further investigation I determined that the PCM was not supplying ground to the Automatic Shutdown Relay, or the Start relay. As the camshaft sensor and/or the crankshaft sensor can tell the PCM to shutdown, I repalced those two items on a long shot to no avail. Had the car towed to a shop I work with and they came to the same conclusion that I did -- the PCM needed replacement.
Called NAPA and they sold reconditioned units for about $170 (with core return) there was a nationwide backorder on them (Don't know why). Found an online outfit All Computer Resources, that had refurb units. The unit was more expensive, but they programmed the VIN and milage in before shipping. I had the unit overnighted to the shop. It arrived the next morning and I had my fingers crossed. The VIN determines the PIN for the passive security system (SKIS code). But, there were no problems. I picked the car up the next day. So far it's running just fine.
PS: if you pick a unit up from the junk yard you will have to get the VIN programmed in before it will run. It might start, but the security system will shut it down. Hope this helps someone.
Posted on Dec 19, 2009
Testimonial: "sorry for the late response. This worked great. Thanks,"
You may be able to get it replaced under warranty if it's less than 80,000 miles on the odometer.
To answer your other question, it all depends on how the PCM was blown. It may have shorted out just enough to cause a constant draw in the system. Maybe not noticeable right away, but weather changes etc. can cause the cumulative drain to be more than the battery is being charged while driving (if you're not putting a LOT of miles on when you drive it)
Posted on Nov 17, 2010
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