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No ecu power

No power to the cars ecu will not work on code reader

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Have you checked the cig lighter fuse ?

Posted on Jul 29, 2013

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2004 Dodge 3500 Ram Cummins will not start and Voltage Gauge and Fuel Gauge does not work and Data Link Connector will not communicate with code reader


sort of says ECU failure buy or exchange available online
would that one have an ECU protector fuse in the engine bay cluster

any problems before with that diagnostic reader or connection cables ......test it on another vehicle


the ECU PCM ECM all a combined unit



Oct 31, 2016 | Dodge Cars & Trucks

1 Answer

What does it mean if you do not recieve a code read out?

that can mean no power to your ECU.i take it you have turned your key to position two so that your ECU has power and your code reader can then start to read the information from your ECU.

Feb 26, 2015 | 2004 Ford Freestar

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My car dont want to start

Check if the ECU is throwing an error code. A code reader gadget will tell you if the ECU is working at all... Check and post your question again with more information.

Jan 11, 2014 | 2003 Mitsubishi Lancer

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2006 VW Jetta code U0100

This problem is with ecu / ecm= engine control computer. These are a common and horrible problem on vw's, particularly on tdi's. The signs in a tdi are when car dash lights come on, but no glow plug light,trans gear lights flash, but car still tries to crank. And hopefully ecu has enough power to out out code u0100= no communication with ecu. Unfortunately the ecu will need to be replacd. The ecu is located under the hood, near and under the wipers. Used ecu with same codes run $50-200. New $1000. If get used one make sure has a return policy. codes must match production quarterly year.

Apr 14, 2013 | 2006 Volkswagen Jetta

1 Answer

I have a 2005 gmc jimmy and I cant get the code reader to work for the ECU

Check your cigar lighter fuse. This fuse also supplies power to the data link connector

Feb 07, 2013 | GMC Jimmy Cars & Trucks

1 Answer

I can not get a code readout to display

Check fuses for the ECU and the diagnostics connection. Aheck for power on conection 16 of the OBD ii

Oct 01, 2012 | Chevrolet Tahoe Cars & Trucks

1 Answer

How do i reset ecu on 06 mazda rx8

if you dont have a code reader, the only other way to reset the computer is to disconnect the battery negative terminal and let it sit for a few minutes. If your steering has elec assist there might be a sensor bad did you check the codes in the ecu?

Dec 30, 2011 | Mazda RX-8 Cars & Trucks

1 Answer

My CEL is on, my code reader reads no codes, sees no live data for any sensor. the jeep seems to run okay, is ecu bad?

Sometimes the code reader will not read the Mopar/Jeep codes. This is different system, CAN system. Drive to your local AutoZone to get your codes from your ECU/ECM.

Jan 23, 2010 | 1999 Jeep Cherokee

2 Answers

Ok how do you check codes ecu on 300zx 90

Here's a step-by-step on how to check stored ECU codes:

You can also monitor O2 sensor input to the ecu on both banks, pretty handy.

Jan 15, 2009 | 1990 Nissan 300ZX

1 Answer


ECU doesnt get reset its fixed. If your trying to clear a CEL you need a reader. You can make one by going to and looking up homemade reader. The reader can clear codes also.

Jul 04, 2008 | 1991 Mercedes-Benz Mercedes Benz 500 Class

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