Question about 1994 Jeep Grand Cherokee

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Codes The check engine light is on, I checked and it show codes No. 12, 21, 34, what means these codes and how can fix the problem? Thanks

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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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I would definately take it back to the dealer and tell them they have not fixed the problem. The Dealer will hook the car up to the ODB II tester to get the codes from your cars computer as to what the computer thinks the problem is. Typically there is more than one oxygen sensor on the exahust system and the dealer ship may have replaced one and need to replace both - or they may have replaced one that was not faulty.

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