1998 Dodge grand Caravan trouble codes

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#1
My van gives me these codes when I turn the key three times and count the flashes. They are 12, 72, 55. I looked at the list and I am confused. If anyone can offer a little help it would be appreciatted. Thanks in advance, Brian
 
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#2
Give us a hint.
What engine?
What is it doing or not doing?
You system is a OBD11 system.
Some cry will still read 2 diget codes key with on 3 times but it is best to go to the OBD11 4 diget codes.
Reread the code and make sure it is code 72.
I am having a hard time finding a code 72

Some auto places will read codes for you free.
Just get the code no and post back and someone will help.
 

kev2

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#3
If your SES is on- I reccomend you take advantage of the free scans some of the auto parts stores do as a customer service, get the code PXXXX post it and someone will advise.. let us know modifications, add on's, aftermarket parts.

two digit codes - not my favorite
12- begin code and indicates communication with PCM
72- I show as a cat effecency code- again I do not care for 2 digit codes
55- end of code list
 
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#4
It is the 3. 0 mitsubishi engine. There have been no mod's or add on's. Just my daily driver. I just changed out main seal, cam seals, valve cover gaskets, timing belt, cap, rotor, distibutor housing o-rings. I had a code before I did all of that though. I just had not checked it out. I will take it somewhere and have them pull the code. Then I will repost what the findings of that are. Brian
 
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#5
Re: 1998 Dodge grand Caravan trouble codes I have them

The code they pulled at the store was p0420 catalyst effeciency below threshold. Is this the o2 sensor in front of the convertor?
 

kev2

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#6
You are so lucky....When of the regular and knowledable tech's here wrote an article on this particular code ......... informative, and troubleshooting info ....

there were NO other codes??
p0420 does NOT say anything about changing 02 sensor....


http://www.troublecodes.net/articles/catfailure/
 
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#7
One of the main causres of cat codes is bad tune up missfires anfd rich exhaust.
How many miles on you last tune up?

Kev-2 posted a good link.
Here is a little to add to it. :)

DTC P0420, P0421, and P0430 & P0431: Check Possible Cause Of Misfire DTC P0420 and P0421 indicate bank one catalyst system efficiency is minimum requirement. DTC P0430 and P0430 indicate bank 2-catalyst system efficiency is minimum requirement. Possible causes are as follows: Use of leaded fuel. Oil contamination. Cylinder misfire. Fuel pressure too high. HO2S sensor improperly connected. Damaged exhaust system component. Faulty ECT sensor. Faulty HO2S. Ensure ignition timing is correct. Retrieve all Continuous Memory DTCs. If misfire code is not present, go to next step. If misfire code is present, isolate cylinder and repair as necessary. Check HO2S Monitor DTCs If DTCs P0136, P0138, P0140, P0141, P0156, P0158, P0160, or P0161 were present in step 1), service as necessary before continuing. If none of these codes are present in step 1), go to next step. Check ECT Sensor DTCs If DTCs P0117, P0118, P0125 or P1117 were present in step 1), service as necessary before continuing. If none of these codes are present in step 1), go to next step. If any codes except P0420, P0421, P0430 and/or P0430 were present in step 1), service as necessary before continuing. If no codes except P0420 and/or P0430 were present in step 1), go to next step. Check Rear HO2S Wiring Harness Turn ignition off. Ensure HO2S wiring harness is correctly routed and connectors are tight. Repair or replace as necessary. If wiring harness and connectors are okay, go to next step. Check Fuel Pressure Turn ignition off. Release fuel pressure. Install fuel pressure gauge. Start engine and allow to idle. Note fuel pressure gauge reading. Increase engine speed to 2500 RPM and maintain for one minute. For fuel pressure specifications, see FUEL PRESSURE SPECIFICATIONS article. If fuel pressure is as specified, go to next step. If fuel pressure is not as specified, go to CIRCUIT TEST HC. Check For Exhaust System Leaks If exhaust system leaks, it may cause catalyst monitor efficiency test to fail. Inspect exhaust system for cracks, loose connections or punctures. Repair or replace as necessary. If exhaust system is okay, go to next step. Check For Exhaust System Restrictions Inspect exhaust system for collapsed areas, dents or excessive bending. Repair or replace as necessary. If exhaust system is okay, go to next step. Check Manifold Vacuum Install tachometer. Connect vacuum gauge to intake manifold vacuum source. Start engine and raise engine speed to 2000 RPM. Manifold vacuum should rise to more than 16 in. Hg. If manifold vacuum is okay, go to next step. If manifold vacuum is low, go to step 11). Leave tachometer and vacuum gauge connected. Start engine and raise engine speed to 2000 RPM. On a non- restricted system, manifold vacuum should quickly rise to normal range as increased RPM is maintained. On a restricted system, manifold vacuum will slowly rise to normal range as increased RPM is maintained. If manifold vacuum is okay, no indication of exhaust leak or restriction has been detected and testing is complete. If manifold vacuum is low or slow to respond, go to next step. Leave tachometer and vacuum gauge connected. Remove exhaust pipe from exhaust manifold. Start engine and raise engine speed to 2000 RPM. If manifold vacuum is now okay, fault is downstream from exhaust manifold. Reconnect exhaust pipe to exhaust manifold and go to next step. If manifold vacuum is still low or slow to respond, fault is in exhaust manifold or intake manifold gasket. Repair or replace as necessary and repeat QUICK TEST. Leave tachometer and vacuum gauge connected. Disconnect muffler/tailpipe assembly from rear of catalytic converter. Start engine and raise engine speed to 2000 RPM. If manifold vacuum is now okay, fault is in muffler/tailpipe assembly. Repair or replace as necessary and test-drive vehicle to verify elimination of symptom. If manifold vacuum is still not okay, fault is in catalytic converter. Repair or replace as necessary. Check tailpipe/muffler assembly for debris from catalytic converter. Test drive vehicle to verify elimination of symptom.
 
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#8
It has approximately 15000 since last plug and wire change. I just changed the cap and rotor last weekend when I changede all of the seals on the distributor housing. Also it may be using alittle more gas than normal. Not much maybe 2 or 3 less miles a gallon. Still getting around 20 not the 23 or so I was getting. Brian
 
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#10
I will check those today. The fuel pump was replaced two months ago. I will see about getting a gage and checking it though. Brian I will repost after I find out.
 
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#11
Hi Guys, What is the base timing supposed to be. I have an advance timing light and at 0 on the dial the line on the balancer is at 12 o'clock. I can't read any numbers or see any kind of mark. Where is the mark supposed to be kind find any reference in my manual. Also still working on the fuel pressure. One other thing when I am under the hood there is a small canister on the fender well with 2 vacuum lines and two electrical lines going into a plug. Should this be vibrating and making an audiblwe clicking noise? It increases with rpm. Brian