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Codes u0121 - 2007 Chevrolet Malibu Maxx LTZ Hatchback

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I want ask code u0121 of dodge 2006


its an abs code the abs system / circuit is not communicating with computer check fuses and wiring to abs system and sensors

Aug 01, 2015 | Dodge Cars & Trucks

2 Answers

Code u0121 please how do i fix it


year 2000? not really huh?
seems the year is wrong,
so if that is true ,is car wrong too, JEEP and grand cherroke wrong too?
for example the 2011 Compass / Patroit
2011 (tsb to replace Pcm) ( have TSB, google finds it easy)
see?

1: get it serviced yet?
2: read the FSM WJ book yet, do all tests it tells you to do ?
there are only 2 paths.
they do it , you do it.?
which one?

WJ 00 (dead end, no code there, OP posted wrong year,. )

U codes are specific to specific jeeps. and years.
posting wrong car....
makes answers impossible. did you scan it yet?

but one thing, we do , is check fuses first.
if the ABS module does not talk, if in fact it is ABS code.
and scan it, first. too.
fuses then scan.
or fail.

these are factory codes, not usa federal codes like P-0300
so post full car spec, and engine, type for best answers.
lets say car is a 2005 GC.
and U0121
see chapter 8E-72 in fsm tells you what to do,
if car is 3rd gen jeep GC, then it has this buss.
the below is the buss, the can c bus
the code means PCM cant talk to the ABS box.
id be all over fuses. and resetting them all.


25781987-qpmzfpq4bzczyesa3jswsd23-1-0.jpg

Jul 13, 2015 | 2000 Jeep Grand Cherokee Laredo

1 Answer

05 chrysler 300 code u1120 and u0121


Both of these have to do with the ABS system. U codes are lost communications codes from computers. Sometimes they are the wires. When you have different computers not communicating. Since yours are both from the ABS, I suspect the ABS module has died. Still could be the wire though (not likely). Check the wire for resistance. if good( less than 5 ohms) then the module has died. When you have ABS system malfunctions, the brakes revert back to the old system. Meaning if you hit the brakes to hard, they could lock the tires and have a skidding effect. BUT the brakes still work, they will stop the vehicle. Basically it is your call to have them fixed.

Nov 09, 2014 | 2005 Chrysler 300

1 Answer

Codes u0121


The brake controller wont talk to the ECM, it could be the cable or the brake controller.

May 07, 2014 | 2005 Mazda 6 2.0

1 Answer

ABS indicator lamp lights up and indicator km(in speedometre) is not lit


try pulling battery for ten minutes or so and see if that clears any of the codes if not use a obd11 code reader and that should give you a correct answer

Apr 22, 2014 | 2011 Ford Ranger

1 Answer

DTC U0121 - Lost Communication With Anti-Lock Brake System (ABS) Control Module


If you clear the code does it come right back AND is the ABS light illuminated on dash?

Apr 17, 2014 | 2011 Ford Ranger

1 Answer

Hello, I have a problem with my Saturn Astra 2008,


U0121 Lost Communication With Electronic Brake Control Module

As with most trouble codes, the U0121 code gives a general diagnosis. Review the info on this link. Look through the service bulletins. The problem could be a loose plug or faulty wiring to one of the modules or between modules that are listed in the article. I hope this helps somewhat. Good Luck......

Apr 03, 2014 | Saturn Astra Cars & Trucks

1 Answer

U0121 code


Usually a P0121 is a problem with the throttle position sensor.
A mechanic would use a scanner to check the output.
You can also use a VOM and check resistance.

Jun 29, 2012 | 2005 Jeep Grand Cherokee

1 Answer

Emission test found some trouble codes


U0121 Communication error to ABS HU/CM

Apr 06, 2009 | 2005 Mazda 6

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