Hello Scotty and everyone! I just had a 2020 Acura TLX FWD 2.4L I4 16V GDI DOHC (auto trans) with only 22,000 miles that I was going to buy from a dealer. Had a mechanic scan it and these deleted codes were found. No current warning lights on. Any help would be soooo appreciated.
Failed battery test 475 cca out of 650
C1600-94 Precision All Wheel Steer System Unexpected Operation
U0126-00 F-CAN Malfunction (Precision All Wheel Steer Control Unit Steering Angle…
U0100-00 F-CAN Malfunction (Precision All Wheel Steer Control Until-PCM)
U101-00 F-CAN Malfunction (Precision All Wheel Steer Control Until-TCM)
U0122-00 F-CAN Malfunction (Precision All Wheel Steer Control Until-VSA Modulator)
U0155-00 F-CAN Malfunction (Precision All Wheel Steer Control Until-Gauge Control)
U0029-00 F-CAN Malfunction (Bus Off)
U129D Gauge Control Module Lost Communication With RTC Unit
U129D F-CAN Malfunction (ECM/PCM-Precision All Wheel Steer)
U0128-00 CAN Communication Failure With Electric Parking Brake
U129D00 Refer to OEM repair information for code description
U0416-68 VSA Brake Actuator Malfunction
U0420-68 EPS Control Unit Malfunction
U1482-68 Precision All Wheel Steer Control Unit Malfunction
"U" codes are network communications failure codes. Failing battery might be a contributing factor, but that's a huge stack of network failures and since the codes were deleted it appears the dealer is trying to conceal something. Was that a flood car? Last thing anyone needs is a car with terminally flaky electronics. Assuming you haven't bought it yet I'd run away from that deal.
I appreciate your response a ton, Chuck, thank you. I did not purchase it, no. I am not aware of any flooding that took place in the car and didn't see any evidence of that. Was not sure if the battery being low would trip those types of codes or not, but not a pro in this area at all.
A low battery can certainly trip communications codes but the dealer trying to hide them is a pretty big red flag that there's something else going on.
Ok, gotcha. I should mention that when I say "deleted," it lists all of these codes as "permanent," not pending or stored. So I know these can only be cleared by doing set drive cycles, but would these have originally tripped a "check engine" light? I am wondering if these were for sure "deleted" by someone or turned off on their own.
Well, I would be very reluctant to buy any car that's showing those kind of codes. Yes, it could be as simple as a bad battery but it also might mean major electronic problems.
I appreciate the candor, thank you! 🙂
the dealer trying to hide them is a pretty big red flag
who says he's trying to hide them?
maybe he just replaced the battery and cleared the codes (like I would)
Or the codes went away on their own.
To my knowledge , the OBD system doesn't make any distinction. They're simply "history codes"
Could be innocent but I'm always suspicious of sellers, especially when dealers are involved.
suspicion is fine, but your post was a baseless condemnation.
I think the challenge regardless is that there's no real easy way to tell what's going on.
the chances that all these modules suddenly failed together (I count five of them) is slim to nil.
It was obviously a systemic thing. Either power failure, or a harness was unplugged or something like that. The fact that the battery failed a test is a dead give-away to me.
.
It was Colonel Battery, in the salon, with the candlestick.
If it has a clean bill of health now, then I wouldn't worry too much. Also, you could use that information to get a better deal on the car. How much do they want?
No current warning lights on
If after a thorough examination by your mechanic; there are no current codes, the car doesn't have other issues/red flags such as signs of flooding, accident damage, etc, then I would not be afraid of buying this Acura.
Although he found some old codes, I would not allow that to be the the deciding factor regarding a purchase.
You had a mechanic examine the car, what was his opinion regarding the overall condition of the vehicle??? (He's on the ground with eyes on/hands on access.)
Everything else checked out ok, but he couldn't be sure there was not a bigger issue lurking. He was wary of it. If he isn't sure, trying to find another mechanic that hopefully knows what they are doing to then assess it again seems like too much to coordinate. Trying to find someone competent and thorough is a big reason people just bite the bullet and buy a new car.
As @mmj mentioned, the odds of 5 modules going bad at once is minuscule. The most likely scenario was a failure in one caused several more. This is not an uncommon occurrence in modern cars and weak/dead batteries are probably the main cause. It's wise of you to do a PPI and I applaud you for doing so, just don't pass on a nice car because it has historical codes that are likely irrelevant now.