Question about 1994 Jeep Grand Cherokee
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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Posted on Jan 02, 2017
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when the engine light on, it means your car has the obd2 code problem, you need a tool to read out and delete the code, then turn the light off, I know this tool is helpful for BMW. Or may be you can take your car to the BMW dealer, they will test the code then show you how to fix it. Or put your code here, i can tell you how to fix. hope help.
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