Question about 1995 Plymouth Voyager

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Codes 12, 21, 34 and 55 show up - 1995 Plymouth Voyager

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Code 21 is the oxygen sensor.. code 12 means the begining of the test. Disregard code 12. It just means you previously disconnected the battery.
55 is end of message. It just means that the test is done and there are no more codes.

All I could find on 34 is this and it doesn't fir your yr.. 34 (1987-1991) speed control shorted or open

I have had two Caravans. a 1993 and 1995.. check your spark plugs and wires.. they can come loose. If you need a new sensor and don't have a lot of money .. go to the wrecking yard.. I look for Vans that were in accidents because that means they were running .. alot of these vans sit because of bad trannys.. beware of one that looks like it has been sitting awhile.. If you are going to do work on your van get a Haynes or Clymer Manual.. This is the first thing I get when I get a "new" used car.. in the past 40 yrs I have rarely taken my cars to the shop if I have the time to work on them myself.. it seems just a normal tune up these days starts at $300 and all they do is change the wires, plugs and cap.. .. Jim

Posted on Jun 07, 2010


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Posted on Jan 02, 2017


SOURCE: codes

check engine light flash code: 12 ,is Battery power to PCM was disconnected This should not be a problem if batt.was replaced or temp. disconnected.
21 is Oxygen sensor input voltage maintained above the normal operating range
34 is in the speed control solenoid circuits./an open or shorted condition detected in the speed control vacum or vent solenoid circuits.
If you are going to atempt do the repairs yourself i sugest purchassing a repair manual for your jeep and go through the steps to dignose these problems in order to repair or replace the componet. all these seem simple enough with a little common knowledge. good luck

Posted on Jun 27, 2008

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