Question about 2005 Lexus RX330

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RX330 fault codes U0123, U0124, U0126 and C1223. No engine light on but vehicle is running rough. Please help

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  • yadayada
    yadayada Mar 20, 2014

    This is an powertrain code with the X being numbers. PXXXX

  • Joanna
    Joanna Mar 21, 2014

    Thanks Dennis for your response. Lexus cleared these codes and told me to keep driving the car. I'm assuming that if I get the car scanned again it will probably come up with new codes relating to the engine problem??


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These are not engine codes, they are body control system codes.

Posted on Mar 20, 2014

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My car is a 2004 model. The VSC light is on. The codes are: U0123, U0124, and U0126.

Lisa,Check attached links,instruction and guides they will tell you all about the codes U0123/0124/0126. Read through the links very informative.
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."

VSC and TRAC OFF light on SCION

Check Engine VSC TRAC OFF lights on my xB Scionlife com

Apr 09, 2016 | Scion xB Cars & Trucks

1 Answer

In need to know what causes the codes( c1241 & c1223 ) on an 05 xb......its also now showing. " maint reqd" light!! Any ideas?

c1223 amp c1241 Questions & Answers - Fixya > Forum > Tags
Get free help, tips & support from top experts on c1223 amp c1241 related issues. ... I have codes C1241 and C1223 on a 2001 Toyota. C1241 and C1223 on a ...

Sep 26, 2015 | Cars & Trucks

1 Answer

Sir,help me I have 2004 Toyota sienna van XLE engine light was . c1201 ,c1223, c1224, u0123 u0124 u0126 P0430 P0420 Thanks Mr felix

c1223 Malfunction in ABS control system
c1201 Brake Boost Sensor Circuit Range/Performance
c1224 Open or short circuit in NE signal circuit
u0123 Lost Communication With Yaw Rate Sensor Module
u0124 Lost Communication With Lateral Acceleration Sensor Module
u0126 Lost Communication With Steering Angle Sensor Module
p0430 Catalyst System Efficiency Below Threshold Bank 2
p0420 Catalyst System Efficiency Below Threshold Bank 1

you have major problems is it worth fixing???,its gonna be quite a bit

Jun 02, 2015 | Toyota Cars & Trucks

1 Answer


Whenever engine fault codes set, VSC is disabled and lights come on. P0020 shows failing cam shaft position sensor , recommend replace clear codes and recheck. gas spill was coincidental.

Dec 24, 2013 | 2007 Toyota FJ Cruiser

1 Answer

Got a 1997 Chevy Suburban 5.7 liter 4 wheel drive and the check engine light is steadily on. I not too long ago changed the spark plugs and just changed the EGR VALVE. As I drive now it's running rough....

What you do when the engine light comes on is to stop the vehicle ---check the oil level and let it cool down then check the coolant level at the radiator. The engine light is the message to you that the CPU has found sensors /servos that have gone outside set parameters and your course of action then is to prove that the engine is safe then run the fault codes to find the recorded faults and fix them . use the code reader to reset the CPU to ensure that the faults are fixed.

Nov 11, 2013 | Cars & Trucks

1 Answer

Abs and traction control lights do not shut off

Hello and welcome to JustAnswer, My name is XXXX *** I will be assisting you.... When the "Service Electronic Brake System" Message appears, its telling you that you have a fault in the ABS(Anti-Lock Brake System)...In order to properly diagnose your vehicle you will need to take it to a shop that has the capability to connect to the ABS Controller.. Once you get the codes, then I can tell you the diagnostics in order to repair your vehicle.. The repairs may range from a clockspring, speed sensor, ABS Module, SCCM, or just needs to be Updated...
Customer :

I did take it to a place and have them connect to the ABS sytem. I think this cost me around $100 with the assumption that it would go toward the repairs if needed. Nothing was done and the mechanic spoke to me personally saying that he thought the sensor could just have dirt or gunk on it but did not mention any codes coming up.
Brad :

Ok, if the light is on the system has codes in it... He may not have had the proper equipment to diagnose your vehicle... But if it says service electric brake system there is a code that is in it and in order to properly diagnose your vehicle, I will need that code... Your vehicle utilizes the newest type of communication which is Can-Bus...Alot of older vehicle scantools wont work with this type of system... You may need to take it to a dealership for them to pull the codes for you
Brad :

I have this case from Jeep, you cn read it and maybe you will understand why the codes are so important in diagnosting your vehicle.
Brad :
Case Number K56486465
Vehicle Issue ABS lamp on. Fault codes C1219 and U0126 logged in the ABS module.;The SCCM must never be replaced unless it has an internal fault related specifically to the SCCM module. If the following conditions are found: - fault codes C1219 and U0126 are logged in the ABS module - the SCCM has no internal faults (active or stored) - the ESP and ABS icons are on and - the Service Electric Brake System message appears The fix is relatively simple and does not require replacing an SCCM.
System or Component Will Not Clear,Will Not Reset,Will Not Turn Off;DTC / Error Message;ABS System,ABS Light / Anti-Lock Light;Yes - Continuously
Recommendation 1) Connect the Starscan tool to the diagnostic connector, power up the tool and set the ignition key to run. 2) Confirm C1219 and U0126 is stored or active in the ABS module. 3) Confirm no faults are active or stored in the SCCM. 4) Position the steering wheel so the tires are pointing straight ahead. 5) Use tool and go to the LID in the ABS or SCCM to observe SAS position. If greater than 360 degrees, you must re-center the SCCM/SAS. Fastest way to re-center the SCCM/SAS is: A) Remove knee blocker to access the steering column/intermediate shaft (I-shaft) knuckle bolt. B) Remove the bolt and slide the I-Shaft off the column shaft. C) While monitoring the SAS position with the tool, rotate the steering wheel at least 360 degrees so the angular position decreases towards 0 degrees (zero). Remember, if the tires are pointing straight ahead, we should be at 0 +/- 30 degrees, so we can reattach the I-shaft and tighten the bolt. D) Clear the faults in the ABS and turn the ignition switch off and then on twice to ensure the cluster warnings and respective faults do not reappear. If the fault reappears, refer to intermittent diagnostics. Please note that Service part numbers have been released to allow for the replacement of necessary components versus replacing the entire SCCM assembly. Service P/N's Hazard SW 05143309A$ Wiper/ Wash 05143310A$ Turn Signal Base 05143311A$ Turn W F Fog 05143312A$ Turn W F Fog and Auto 05143313A$ Turn W R Fog 05143314A$ Turn W R Fog and Auto 05143315A$ Cancel Cam 05143321A$~ Electronic Box (inc CSR) w/o SAS 05143319A$ Electronic Box (inc CSR) w/ SAS 05143320A$

Jul 28, 2012 | 2006 Chevrolet Equinox

1 Answer

What do codes: C1223, U0121, U0123, U0124, U0126 mean found after a diagnostic test in my 2004 Toyota Solara?

Same here. I stopped by Autozone and they gave me the following codes. P0020, U0126, U0124, U0123, U0073, C1223 and C1201. The only thing I did was splash some fuel the day before at a questionable gas station. Please help

Jun 19, 2012 | 2004 Toyota Solara

3 Answers

2003 toyota abs light Codes C1203, C1223

C1223 - Left Rear Wheel Speed Sensor Input Signal is 0 C1203 - The procedure for this fault is to check for an open or short in the harness and connector between the Skid control ECU and ECM.If no faults are found with the wiring, then - the MIL stays off when ignition on but engine not running (Requires ECM replacing)
- the MIL comes on when ignition on but engine not running (requires ABS & traction actuator assembly)
These parts wont be cheap so i hope its a wiring fault smile.gif
If you take it to a Toyota dealership they should be able to do this for you pretty easily.

Mar 02, 2011 | 2003 Toyota Sequoia

2 Answers

Check engine light on running very rough

go to autozone for a free computer scan and get the fault code. Possibly one of the COPS, Coil on Plug. COde will tell you

Dec 06, 2009 | 2002 Ford Expedition

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