These Autel's are awesome scan tools for the money...I picked up a MS906CV for $1400(I do more heavy truck,but it'll do light vehicles too)...money well spent...BUTTTTTTT.....one thing I learned about these scanners,is sometimes they'll trigger a false-positive code in some modules and won't always communicate...happens mostly with Ford, but just a heads up....had my '16 F150 with U0121 coming from the PSCM that has been driving me crazy...no CEL..all of the trac control and ABS work just fine..communicates with all modules, but keeps giving me that damn code....after weeks of chasing,I finally said fuck it and let Ford scan it...they found no faults,even though mine was showing the code...after speaking with Ford Tech support,they explained that for some reason or another, that the software protocols that Autel uses with Android can actually trigger an event,even though nothing is faulty...they actually recommend scanning with Key Off,EO,unless checking PCM,which you would need to scan with KOEO or KOER....certainly wasn't the case with your diag,but just a heads up for the future...also,cant go wrong with a Fluke...my 87 is my primary, and I use a Klein mm2000 for load test...ive seen techs use meters without true RMS or load test/LowZ and they're chasing ghost voltage and scratching their heads..LOL....Great vid man...from one tech to another - you know your shit 🤙
I have that happen, false positives. Simply, I just go to the generic scanner, (usually those fake codes are in Pcm) if the generic doesn't detect a code then I don't chase my ass lol. I have this happen 4x. Usually with vw Audi I get them
I have same issue of the "" no communication with ABS module"" in my 2008 jeep patriot tried a different module still no communication. verified 12v pos/gnd at module wiring harness. kind of at a loss now. using a Snap-on Verus Edge. fyi. any suggestions be helpful thx
Very good video! You just earned another subscriber. I just did a trans swap on my 09 impala.. I have the same code. I'm gonna check that wire. If it's not that what else could it be? The code wasnt there before I did the trans swap
Powers and grounds! I thoroughly go the the test in video. It's very simple.... If that don't work. Try unplugging and plugging it back in, could be connection related. Your issue seems like human error though, especially If it wasn't there before. I'm confident you'll either resolve or know your problem following my steps. Please update if you tried everything without resolution. I'll try my best to assist you
I’m having a similar problem with my 2010 impala it says lost communications with pcm ecu A the car just has the check engine light but my speedometer goes crazy and hit has a hard time shifting at the right times and this started after I losen that ground wire but I tighten it and still same problem
@@partsshooter I just sang "powers and grounds" to the tune of "boats and hos" from Stepbrothers. AAANNNNNDDDDD now you are too. You're welcome. Great video! Thanks
How to check the ABS plug on an avometer, read the hot and cold volts, and the line was on a resistance. We have to boil one of the battery’s positive or negative electrodes before checking if the car battery remains in its position and check thanks dear
Hey there... I apologize, I can't understand your question. Can you dumb it down for clarity. I'm just missing some direction as to the issue you're having. Thanks Just rephrase the question
I enjoyed this nice video! I see this U0121 with U0422 on a 19 chevy Tahoe. No check engine light, but I have tpms light on. Replaced one of the tpms sensors however tire shop says he can’t program them. Car was wrecked and trying to fix it. Any idea if this is the similar issue here?
Hey Bran...just replaced my SDM in a 09 Avalanche ltz, 5.3 v8. Initial issue, and still occurring by the way, various instrument cluster indicators flash along with service messages. Also all gauges move back and forth...with car in idle and moving. ABS, TRACTION CONTROL, AIR BAG, BREAKS, TBS and ENGING all flash or stay on then go off. Then get messages to service TRACTION CONTROL, AIR BAG, STABILITRAC, SUSPENSION AND 4 WHEEL SYSTEM. Have you seen this before?
I haven't seen this before... But the clusters are known to go bad...[that's least of our worries it seems] To be more help, try pulling codes with a complete scan of ALL MODULES, clear codes and see what immediately come back, enter that module in question and retrieve codes. Update this post and we can go from there.... It seems like a communication issue, or modules incapable of communicating with replaced unit [require programming] Link up with the PCM and go from there, can't know what the computer has issues with until messages are relayed through all modules and codes are retrieved.
@@partsshooter Thanks....I'll definitely update you. The module was supposed to be programmed when I had it installed. Also looking at engine grounding wires and mega fuse for corrosion. Just a shot in the dark
@@mrparker1972 yeah... Accessing the module will answer a lot! So there wouldn't be any "shooting in the dark"😆 Once module is access, we could look at PID data, it'll display "battery voltage" for starters... Which will deduce inspecting fuses and grounds [to a degree] A generic scan tool can't achieve this BTW, bidirectional needed, I'm sure you know this, thought I'd mention.
@@partsshooter yeah, shooting in the dark can be expensive as well as dangerous...😄😉. I'll be taking it back to the shop that just did the replacement to read the codes properly. I also noticed the rubber covering on the positive post is exposing about a 1/4 of the wires underneath. Wonder if this could be part or the problem....
Depending on if it's "hot" KOEO" or "hot" all times, checked fuses and or track down broken wire if, wire at power source show signs of power but not at component
@@partsshooter I checked it with key on engine off and key off. The other power wire works with key off also. Thanks for the respond I'm going to check for broken wires. You know how the wiring is like a maze
@@johnniecrain7986 ensure you're checking the correct wire! Make sure it require power. [I understand how convoluted things can be] Used a an ohm meter to aid in narrowing down wires, some good meters have sound [beep] to allow rapid wire checks during wire piercing, also send bias voltage using the test light! From module end to power source, and basically do voltage check ensuring correct wire and resistance value to confirm. Hope that make sense!
I checked all the grounds and powers they all seem to be good but still getting the same code and the light still on I thought for a moment I was something I did since I replaced the Trany still it’s just odd
@@valeferto8239please, follow instruction in the video... This cars transmission was replaced before. Try clearing codes...or a hard reset, leave battery disconnected for several hours. Try wiggle test while meter is hooked up to tested wire. If things were fine before someone touched it, it's a high probability it's human error, please recheck your work. This is common mistake we make with large jobs. Please look into above mention CAN system testing, this is more in-depth however this seems like human error. Rare case the abs module is defective. Recheck and update me on your finding
My first time on your channel. Bro, please stop back probing or piercing connector wires when the connector is in your hand when you can just touch the metal pin inside gently, DAMN DOG. ABS modules have enough problems without waiting for green crusties to build up later in your big pierce holes from your fat meter leads and test light lead. Please get a proper probe & piercing set from AESWave and front probe in cases like this. Thank you for the case study.
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You are a great mechanic I wish they were all like you
excellent diagnoses brother.i love the dreads.for a second ,i thought snoop dawg was workin on the truck
Thank you for your help and professional insights. Wish you were local. I would use you exclusively with my fleet. PRICELESS.
Great video brother! I appreciate you!
you should be a teacher!! outstanding video!
Voltage drop works good too 👍 good video
These Autel's are awesome scan tools for the money...I picked up a MS906CV for $1400(I do more heavy truck,but it'll do light vehicles too)...money well spent...BUTTTTTTT.....one thing I learned about these scanners,is sometimes they'll trigger a false-positive code in some modules and won't always communicate...happens mostly with Ford, but just a heads up....had my '16 F150 with U0121 coming from the PSCM that has been driving me crazy...no CEL..all of the trac control and ABS work just fine..communicates with all modules, but keeps giving me that damn code....after weeks of chasing,I finally said fuck it and let Ford scan it...they found no faults,even though mine was showing the code...after speaking with Ford Tech support,they explained that for some reason or another, that the software protocols that Autel uses with Android can actually trigger an event,even though nothing is faulty...they actually recommend scanning with Key Off,EO,unless checking PCM,which you would need to scan with KOEO or KOER....certainly wasn't the case with your diag,but just a heads up for the future...also,cant go wrong with a Fluke...my 87 is my primary, and I use a Klein mm2000 for load test...ive seen techs use meters without true RMS or load test/LowZ and they're chasing ghost voltage and scratching their heads..LOL....Great vid man...from one tech to another - you know your shit 🤙
I have that happen, false positives. Simply, I just go to the generic scanner, (usually those fake codes are in Pcm) if the generic doesn't detect a code then I don't chase my ass lol. I have this happen 4x. Usually with vw Audi I get them
I have same issue of the "" no communication with ABS module""
in my 2008 jeep patriot tried a different module still no communication. verified 12v pos/gnd at module wiring harness. kind of at a loss now. using a Snap-on Verus Edge. fyi. any suggestions be helpful thx
You the man
Very good video! You just earned another subscriber. I just did a trans swap on my 09 impala.. I have the same code. I'm gonna check that wire. If it's not that what else could it be? The code wasnt there before I did the trans swap
Powers and grounds! I thoroughly go the the test in video. It's very simple....
If that don't work. Try unplugging and plugging it back in, could be connection related.
Your issue seems like human error though, especially If it wasn't there before. I'm confident you'll either resolve or know your problem following my steps.
Please update if you tried everything without resolution. I'll try my best to assist you
@@partsshooter the ground is tight and I checked all of the wires you had mentioned they all have power
@@LSX-zr8ng do you have a bidirectional scanner?
I’m having a similar problem with my 2010 impala it says lost communications with pcm ecu A the car just has the check engine light but my speedometer goes crazy and hit has a hard time shifting at the right times and this started after I losen that ground wire but I tighten it and still same problem
@@partsshooter I just sang "powers and grounds" to the tune of "boats and hos" from Stepbrothers. AAANNNNNDDDDD now you are too. You're welcome. Great video! Thanks
How to check the ABS plug on an avometer, read the hot and cold volts, and the line was on a resistance. We have to boil one of the battery’s positive or negative electrodes before checking if the car battery remains in its position and check thanks dear
Hey there... I apologize, I can't understand your question. Can you dumb it down for clarity. I'm just missing some direction as to the issue you're having. Thanks
Just rephrase the question
My impala doing the same thing abs and brake light flickers on and off especially after I hit a bump
so thats how you get those plugs apart - thae Oooold gentle rotary-push-lyft-slide-manuvr✋.. thats wat I was gSCng but thNx none-the-lS😔
I enjoyed this nice video! I see this U0121 with U0422 on a 19 chevy Tahoe. No check engine light, but I have tpms light on. Replaced one of the tpms sensors however tire shop says he can’t program them. Car was wrecked and trying to fix it. Any idea if this is the similar issue here?
Gracias amigo, me ayudaste bastante con este video..
Hey Bran...just replaced my SDM in a 09 Avalanche ltz, 5.3 v8. Initial issue, and still occurring by the way, various instrument cluster indicators flash along with service messages. Also all gauges move back and forth...with car in idle and moving. ABS, TRACTION CONTROL, AIR BAG, BREAKS, TBS and ENGING all flash or stay on then go off. Then get messages to service TRACTION CONTROL, AIR BAG, STABILITRAC, SUSPENSION AND 4 WHEEL SYSTEM. Have you seen this before?
I haven't seen this before... But the clusters are known to go bad...[that's least of our worries it seems]
To be more help, try pulling codes with a complete scan of ALL MODULES, clear codes and see what immediately come back, enter that module in question and retrieve codes. Update this post and we can go from there....
It seems like a communication issue, or modules incapable of communicating with replaced unit [require programming]
Link up with the PCM and go from there, can't know what the computer has issues with until messages are relayed through all modules and codes are retrieved.
@@partsshooter Thanks....I'll definitely update you. The module was supposed to be programmed when I had it installed. Also looking at engine grounding wires and mega fuse for corrosion. Just a shot in the dark
@@mrparker1972 yeah... Accessing the module will answer a lot! So there wouldn't be any "shooting in the dark"😆
Once module is access, we could look at PID data, it'll display "battery voltage" for starters... Which will deduce inspecting fuses and grounds [to a degree]
A generic scan tool can't achieve this BTW, bidirectional needed, I'm sure you know this, thought I'd mention.
@@partsshooter yeah, shooting in the dark can be expensive as well as dangerous...😄😉. I'll be taking it back to the shop that just did the replacement to read the codes properly. I also noticed the rubber covering on the positive post is exposing about a 1/4 of the wires underneath. Wonder if this could be part or the problem....
awesome!
So he just disconec and connec
What is the name of your shop? And what city are you in?
Sorry meant Brad....typing too fast...lol.
What was the transmission doing when this was happening i have the same code
Transmission worked perfectly fine! The lady just had it replace from another place
Hey man one of my red and black positive wire isn't hot. What would you have done if your test would have came out this way. Thanks
Depending on if it's "hot" KOEO" or "hot" all times, checked fuses and or track down broken wire if, wire at power source show signs of power but not at component
@@partsshooter I checked it with key on engine off and key off. The other power wire works with key off also. Thanks for the respond I'm going to check for broken wires. You know how the wiring is like a maze
@@johnniecrain7986 ensure you're checking the correct wire! Make sure it require power. [I understand how convoluted things can be]
Used a an ohm meter to aid in narrowing down wires, some good meters have sound [beep] to allow rapid wire checks during wire piercing, also send bias voltage using the test light! From module end to power source, and basically do voltage check ensuring correct wire and resistance value to confirm. Hope that make sense!
punching holes in wires in harness's is not a good idea.
What about if the grounds and powers are fine
Then there could be C.A.N. issues... Or internal failure of the and unit itself
I checked all the grounds and powers they all seem to be good but still getting the same code and the light still on I thought for a moment I was something I did since I replaced the Trany still it’s just odd
@@valeferto8239 what code?
The u0121 code
@@valeferto8239please, follow instruction in the video... This cars transmission was replaced before.
Try clearing codes...or a hard reset, leave battery disconnected for several hours.
Try wiggle test while meter is hooked up to tested wire.
If things were fine before someone touched it, it's a high probability it's human error, please recheck your work. This is common mistake we make with large jobs.
Please look into above mention CAN system testing, this is more in-depth however this seems like human error. Rare case the abs module is defective.
Recheck and update me on your finding
I have this same issue. Where is the ground wire coming from?
Transmission... it's in the video
I see where it's grounded to, I'm trying to trace it back to where there wire starts.
Your car..is 2007 not 2006 wekup man
My first time on your channel. Bro, please stop back probing or piercing connector wires when the connector is in your hand when you can just touch the metal pin inside gently, DAMN DOG. ABS modules have enough problems without waiting for green crusties to build up later in your big pierce holes from your fat meter leads and test light lead. Please get a proper probe & piercing set from AESWave and front probe in cases like this. Thank you for the case study.
btw., it can always ‘B that EZ’.. oOr ‘problem’, so 2 sPk, is UsULE Ovr F4t😑.(agN, gr8 pic swrvl trik, & thNQ)