ECM not communicating with alternator's voltage regulator.

Asked by Mar 14, 2016 at 01:54 PM about the 1998 Dodge Grand Caravan

Question type: Maintenance & Repair

Battery is not charging.  Was told regulater bad.  Replaced alternator have same
problem. Suspected bad wire to ECM or ECM.

8 Answers

The ECM in some manner controls the voltage regulator, which charges the battery.

42,475

The voltage regulator works all on its own. The computer does not control it in any way.

rowefast is a MORON the voltage regulator driver is a chip built into the dodge PCM and can only be fixed by 3 methods 1 replace pcm 2 bypass internal pcm voltage regulator with an external one however this will have a check engine light on and a code and the battery guage will read zero 3 remove PCM and take it apart and replace or re solder the voltage regulator driver chip if issue is intermittent then re solder

42,475

Excuse Me Ass-Hole? Everybody has a bad day.

42,475

Yes the charging system goes through the pcm ,The Electronic Voltage Regulator (EVR) is not a separate component. It is actually a voltage regulating circuit located within the Powertrain Control Module (PCM) . The EVR is not serviced separately If replacement is necessary the PCM must be replaced.check the wiring fron the alternator for a bad fusible link ,also check the wire from the alt to the pcm(brown/grey wire) ,here are some diagram for that system . The pcm would have to be flashed if someone has the equiptment then it can be flashed at somewhere else than a dealer but if you dont know anyone that has the tools to do this (good scanner -snap-on etc)with the reflash capability then it has to be done at the dealer...

42,475

Charging Diagram...

42,475

Plugin and pin location...

42,475

And the Chart...

1 out of 1 people think this is helpful.

Your Answer

Add photo

Related Questions

  • voltage regulator 3 answers

    If pcm fails to regulate voltage, can I rig an external regulator to bypass pcm. Would the car run and would it throw any codes for emissions testing.

    2005 Dodge Grand Caravan 4 Dr SE Passenger Van Extended

    -

    Maintenance & Repair

  • fuel pump regulator

    have a 2006 dodge grand caravan replaced fuel pump but not getting any fuel pressure to fuel rail.could it be fuel pressure regulator. was told that fuel pressue regulator tells fuel pump to pump.

    2006 Dodge Grand Caravan SXT

    -

    Maintenance & Repair

  • power windows will not go up 2 answers

    replaced both motors in doors, worked great for 3-4 weeks, no all windows won't go up. Is there a fuse or regulator that may run all these ? If so, where is it ?

    1999 Dodge Grand Caravan

    -

    Maintenance & Repair

  • Passenger side window 2 answers

    My passenger side window will not go up or down the drivers side works fine

    2006 Dodge Grand Caravan SXT

    -

    Maintenance & Repair

  • Where is the voltage regulator located on 1992 350 cummins diesel 1 answer

    I am looking for the voltage regulator on my 1992 dodge 5.9 Cummings diesel

    1992 Dodge RAM 350 2 Dr LE Turbodiesel 4WD Extended Cab LB

    -

    Maintenance & Repair

Grand Caravan

Looking for a Used Grand Caravan in your area?

CarGurus has 11,317 nationwide Grand Caravan listings starting at $2,490.

Postal Code:

Search Dodge Grand Caravan Questions

UK Questions

Are you a UK consumer? CarGurus now has a discussion forum in the UK.

Dodge Grand Caravan Experts

#1 Tom Demyan
Tom Demyan
Reputation 2,480
#2 dandyoun
dandyoun
Reputation 740
#3 FordNut
FordNut
Reputation 680
View All

Related Models For Sale

Used Chrysler Town & Country
96 Great Deals out of 963 listings starting at $1,695
Used Toyota Sienna
18 Great Deals out of 617 listings starting at $2,480
Used Dodge Caravan
100 listings starting at $3,500
Used Honda Odyssey
3 Great Deals out of 447 listings starting at $3,800
Used Dodge Durango
26 Great Deals out of 911 listings starting at $3,439
Used Nissan Quest
55 listings starting at $3,800
Used Ford Explorer
20 Great Deals out of 893 listings starting at $2,995
Used Ford F-150
379 Great Deals out of 6,440 listings starting at $502
Used Chevrolet Tahoe
329 listings starting at $6,477
Used Honda CR-V
41 Great Deals out of 1,910 listings starting at $2,995

Used Cars For Sale

2017 Dodge Grand Caravan For Sale
7 Great Deals out of 6,353 listings starting at $21,640
2016 Dodge Grand Caravan For Sale
63 Great Deals out of 2,265 listings starting at $16,777
2015 Dodge Grand Caravan For Sale
53 Great Deals out of 522 listings starting at $11,862
2014 Dodge Grand Caravan For Sale
25 Great Deals out of 463 listings starting at $8,900
2013 Dodge Grand Caravan For Sale
20 Great Deals out of 400 listings starting at $9,895