Power Steering Light and DTC C1555
05-21-17, 02:41 PM
#1
Driver School Candidate
Thread Starter
Power Steering Light and DTC C1555
Hi folks,
Jumped in the car on Friday morning and started the car, only to be greeted with the PS light illuminated and a dash warning saying Check Power Steering and Check VSC System. I believe the VSC is a red herring which is caused by the PS DTC. Obviously the steering was not getting any electrical assistance and was very heavy to operate. I plugged in my laptop and fired up Techstream and got code C1555 - Motor Relay Welding failure. After going through the workshop manual and doing some electrical checks (funny because the workshop manual is actually wrong) it seems the loom is fine and the PS motor on the rack is within resistance spec. This leaves me with replacing the PS ECU as the next step, according to the workshop manual troubleshooting.
Before I go ahead and order the part or find a used one, has anyone here come across the same issue?
Thanks,
Mark
Jumped in the car on Friday morning and started the car, only to be greeted with the PS light illuminated and a dash warning saying Check Power Steering and Check VSC System. I believe the VSC is a red herring which is caused by the PS DTC. Obviously the steering was not getting any electrical assistance and was very heavy to operate. I plugged in my laptop and fired up Techstream and got code C1555 - Motor Relay Welding failure. After going through the workshop manual and doing some electrical checks (funny because the workshop manual is actually wrong) it seems the loom is fine and the PS motor on the rack is within resistance spec. This leaves me with replacing the PS ECU as the next step, according to the workshop manual troubleshooting.
Before I go ahead and order the part or find a used one, has anyone here come across the same issue?
Thanks,
Mark
05-23-17, 01:28 PM
#2
Hi folks,
Jumped in the car on Friday morning and started the car, only to be greeted with the PS light illuminated and a dash warning saying Check Power Steering and Check VSC System. I believe the VSC is a red herring which is caused by the PS DTC. Obviously the steering was not getting any electrical assistance and was very heavy to operate. I plugged in my laptop and fired up Techstream and got code C1555 - Motor Relay Welding failure. After going through the workshop manual and doing some electrical checks (funny because the workshop manual is actually wrong) it seems the loom is fine and the PS motor on the rack is within resistance spec. This leaves me with replacing the PS ECU as the next step, according to the workshop manual troubleshooting.
Before I go ahead and order the part or find a used one, has anyone here come across the same issue?
Thanks,
Mark
Jumped in the car on Friday morning and started the car, only to be greeted with the PS light illuminated and a dash warning saying Check Power Steering and Check VSC System. I believe the VSC is a red herring which is caused by the PS DTC. Obviously the steering was not getting any electrical assistance and was very heavy to operate. I plugged in my laptop and fired up Techstream and got code C1555 - Motor Relay Welding failure. After going through the workshop manual and doing some electrical checks (funny because the workshop manual is actually wrong) it seems the loom is fine and the PS motor on the rack is within resistance spec. This leaves me with replacing the PS ECU as the next step, according to the workshop manual troubleshooting.
Before I go ahead and order the part or find a used one, has anyone here come across the same issue?
Thanks,
Mark
This is very interesting. I have the same problem. Just started the car this morning and got the stiff steering. Upon pulling the code, I got C1555. Does one replace the steering ecu?, Where is it located. I would be grateful for any help.
03-05-19, 02:10 PM
#4
03-27-20, 05:19 AM
#5
Driver School Candidate
Join Date: Mar 2020
Location: Brunei
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WHAT WAS THE ANSWER? THE SOLUTION? WHY PEOPLE DIDNT UPDATE? Was it solved? I have same problem bought EPS ECU TWICE still cant turn!
Fault code C1532 & C1555
LEXUS IS250 2007
Fault code C1532 & C1555
LEXUS IS250 2007
03-27-20, 06:08 AM
#6
Hello,
my solution was to replace my power steering rack. I went used to save some money. Located one for around $900 and installed it myself.
good luck!
Frankie
04-20-20, 07:02 AM
#7
SOLVED C1555 P/S lexus is350 2008
After an hour of investigation FINALLY SOLVED Box steering rack had so much water inside it, because of the rain.
had to totally open it and clean it, changed two bearings inside (need so much tools to do that by ur self)
now its perfect.
Thanks
had to totally open it and clean it, changed two bearings inside (need so much tools to do that by ur self)
now its perfect.
Thanks
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02-12-21, 11:22 PM
#9
11-30-22, 08:01 AM
#10
3rd Gear
Join Date: Nov 2022
Location: Ajman
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Hi Amir
How did the steering rack on your car went bad. I went through a flood and from then I am getting check power steering warning and code 1555. I am able to use my steering by following a small trick from YouTube while starting the car. Also can you share how much did Al Basma charged you to repair the steering rack. Were you able to use your steering when you faced the problem.
How did the steering rack on your car went bad. I went through a flood and from then I am getting check power steering warning and code 1555. I am able to use my steering by following a small trick from YouTube while starting the car. Also can you share how much did Al Basma charged you to repair the steering rack. Were you able to use your steering when you faced the problem.
12-01-22, 01:59 PM
#11
Hi Amir
How did the steering rack on your car went bad. I went through a flood and from then I am getting check power steering warning and code 1555. I am able to use my steering by following a small trick from YouTube while starting the car. Also can you share how much did Al Basma charged you to repair the steering rack. Were you able to use your steering when you faced the problem.
How did the steering rack on your car went bad. I went through a flood and from then I am getting check power steering warning and code 1555. I am able to use my steering by following a small trick from YouTube while starting the car. Also can you share how much did Al Basma charged you to repair the steering rack. Were you able to use your steering when you faced the problem.
12-03-22, 01:58 AM
#14
3rd Gear
Join Date: Nov 2022
Location: Ajman
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I would suggest to look into if there is any code. I had ps lights when I start the car and used the trick to loose the hard steering but after a while started to notice noise from steering box, now I have to replace my steering box.
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