Tip & How-To about Chrysler Town & Country

Charging system,late model Chrysler vehicles

2000 year and newer chrysler products put the voltage regulator in the PCM. If the regulator fails the replacement ECM is about 800.00
An earlier ,say 1987,electronic firewall mounted regulator( 2wire) can be simply wired in for about 20 bucks.
One alternator fld terminal to the new regulator,the other fld lead to the center terminal of the regulator ,this fld wire must also be tied into ign.+
Be sure not to apply ign. voltage to the right side terminal or you will fry the regulator.

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Voltage problem.


the problem is in the voltage regulator
maximum voltage is controlled at 14.5 to 14.8 volts depending on whether the voltage regulator is in the ECM or not
but 14.8 would be max allowed any higher can damage the electronics of the vehicle including the ECM
take it to an accredited auto electrician, have it test and adjusted or the regulator replaced

Nov 25, 2015 | Buick Rendezvous Cars & Trucks

1 Answer

I have a 2006 Chrysler PT cruiser 2.4L engine, gets a P0562 low voltage code on the TCM and 0700 on PCM/ECM/ECU.


code p0562 refers to system voltage low---or ECM power relay control--open circuit ===causes for both ---wiring---poor connection ---battery--- alternator
and wiring ---ecm relay
If the voltage is low then the ECM relay may be not able to remain closed all the time.
code p0700 refers to transmission control module (TCM) MIL ----malfunction===causes wiring ---- TCM
from the first code --it suggests that the power from the alternator is below requirement and the electronics are malfunction because of it
check all wires and connections are clean and tight
check for good ground wires on the engine and battery terminals are shiny clean and tight
I would suggest a load test on the battery as if it is failing then the charge from the alternator will be going to the battery and starving the electronics
bench test the alternator as it may be the regulator as well
TCM controls the transmission functions

Jul 01, 2015 | 2006 Chrysler PT Cruiser

2 Answers

2000 Chrysler cirrus 2.4. Idle in neutral drive in reverse but cuts off when put in drive?? Why what do I got to do to fix this?


The most common cause of this is a bad ground to the ECM. When the car is in any gear other than a forward gear, the ECM is not monitoring the emissions. When you put it in drive it does and when there is a bad ground all the return voltages from the sensors are wrong because they are grounded and the ECM is trying to pull ground through them.

May 03, 2015 | Chrysler Cars & Trucks

1 Answer

Code P0621


P0621 Generator Lamp/L Terminal Circuit Malfunction,,The Engine Control Module (ECM) or Powertrain Control Module (PCM) uses the generator turn on signal circuit to control the load of the generator on the engine. A high side driver in the ECM/PCM applies a voltage to the voltage regulator. This signals the voltage regulator to turn the field circuit ON and OFF. The ECM/PCM monitors the state of the generator turn on signal circuit. The ECM/PCM should detect low voltage on generator turn on signal circuit when the ignition is ON and the engine is OFF, or when the charging system malfunctions. With the engine running, the ECM/PCM should detect high voltage on the generator turn on signal circuit. The ECM/PCM performs Ignition ON and RUN tests to determine the status of the generator turn on signal circuit.

Aug 27, 2011 | Pontiac Grand Am Cars & Trucks

1 Answer

i have a 93 jeep grand cherokee changed altenator but still wont charge


If no damaged wiring is found, it's most likely an internal fault in the ECM (Engine control module, computer, PCM, ECU, whatever you want to call it, it goes by many names)
The Voltage Regulator is built into the ECM on virtually every Chrysler product (including Jeeps) after 1987 or so. And it is prone to failure. If it does fail, you either have to replace the ECM or install an External Chrysler Voltage Regulator, which requires some wiring harness modifications and a few parts that can be purchased at your favorite auto parts store.
To do the External conversion, you'll need :
1 Chrysler Voltage Regulator (virtually any Dodge/Plymouth from 1970 - 1986. It's best to order one for a 70's 4x4 Truck with a 318 engine though, to avoid any possible mix ups)
1 Chrysler Voltage Regulator Pigtail (this is the plug that connects to the regulator)
Roughly 10 feet of 14 gauge wire, possibly less, depending on where you want to mount the regulator.
Most, if not all Regulators now include a wiring diagram in the box, for this purpose, just follow the diagram and match up the field wires on the alternator with the ones in the diagram. On a '93 Jeep one field wire should be Blue, the other should be Green.

Aug 23, 2011 | Jeep Grand Cherokee Cars & Trucks

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