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.

37,975

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

37,975

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

37,975

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...

37,975

Charging Diagram...

37,975

Plugin and pin location...

37,975

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 11,091 nationwide Grand Caravan listings starting at $1,150.

Postal Code:

Search Dodge Grand Caravan Questions

Dodge Grand Caravan Experts

#1 Tom Demyan
Tom Demyan
Reputation 2,440
#2 dandyoun
dandyoun
Reputation 730
#3 FordNut
FordNut
Reputation 660
View All

Related Models For Sale

Used Chrysler Town & Country
71 Great Deals out of 1,035 listings starting at $5,900
Used Dodge Caravan
111 listings
Used Toyota Sienna
10 Great Deals out of 614 listings starting at $2,480
Used Honda Odyssey
6 Great Deals out of 405 listings starting at $3,895
Used Dodge Durango
22 Great Deals out of 811 listings starting at $3,439
Used Nissan Quest
3 Great Deals out of 53 listings starting at $3,900
Used Ford Explorer
35 Great Deals out of 1,023 listings starting at $2,995
Used Ford F-150
462 Great Deals out of 7,088 listings starting at $426
Used Chevrolet Tahoe
337 listings starting at $6,477
Used Toyota Camry
50 Great Deals out of 1,398 listings starting at $2,777
Used Dodge Ram 1500
47 Great Deals out of 457 listings starting at $2,000

Used Cars For Sale

2017 Dodge Grand Caravan For Sale
5,096 listings starting at $21,880
2016 Dodge Grand Caravan For Sale
48 Great Deals out of 3,177 listings starting at $16,887
2015 Dodge Grand Caravan For Sale
71 Great Deals out of 547 listings starting at $12,862
2014 Dodge Grand Caravan For Sale
44 Great Deals out of 475 listings starting at $8,949
2013 Dodge Grand Caravan For Sale
17 Great Deals out of 420 listings starting at $8,900