Oldsmobile Alero C1225 and C1233
#1
Oldsmobile Alero C1225 and C1233
Please help,
I am not sure if i am posting this in the right section of this forum as i am pretty new to this but i am learning.
My car has the service engine light on and has the error codes C1233 and C1225. When i clear the codes, C1233 doesnt go away and stays on but C1225 does evantually come back.
What could be causing this, i have heard the LF Wheel Sensor? But what exactly is that ? the rotor ?
TIA
I am not sure if i am posting this in the right section of this forum as i am pretty new to this but i am learning.
My car has the service engine light on and has the error codes C1233 and C1225. When i clear the codes, C1233 doesnt go away and stays on but C1225 does evantually come back.
What could be causing this, i have heard the LF Wheel Sensor? But what exactly is that ? the rotor ?
TIA
#2
Senior Member
Welcome to the forum John.
When I looked up C1223 (chassis code) I get L Rear wheel speed sensor, input signal zero.
Could be a harness connection problem from the wheel speed sensor (back of the hub/bearing unit)or broken cut wire? Or time for a new hub?
On C1225 I get Left Front Excessive Wheel Speed Variation.
Do you have noisy bearing/hub there?
When I looked up C1223 (chassis code) I get L Rear wheel speed sensor, input signal zero.
Could be a harness connection problem from the wheel speed sensor (back of the hub/bearing unit)or broken cut wire? Or time for a new hub?
On C1225 I get Left Front Excessive Wheel Speed Variation.
Do you have noisy bearing/hub there?
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Last edited by Soft Ride; 12-14-2014 at 07:26 PM. Reason: try noisy
#3
Senior Member
It'* LF excessive wheel variation, and RF open/shorted.....thus you have two separate problems......
If the RF is open/shorted, that will come on right away....i.e., if open, as soon as you move you will get a zero reading while the others 3 sensors will be giving a reading....this will cause an immediate code....
The other code will only trigger, if the signal varies enough to be out of range....
As a GM tech, the only way I could diagnose these problems, especially C1233, was a snapshot with Tech II scanner......taking a test drive, doing ABS stops, observing data especially on turns......also having an old spare hub, can quickly diagnose a bad one, when connected to the harness while reading data and spinning it...
Excessive variation is usually the hub/sensor.......open/shorted could be the hub/sensor or harness, or in the case of water intrusion, BOTH......you can guess and change parts, which can be costly, or you go to someone who can do proper diagnosis.....
If the RF is open/shorted, that will come on right away....i.e., if open, as soon as you move you will get a zero reading while the others 3 sensors will be giving a reading....this will cause an immediate code....
The other code will only trigger, if the signal varies enough to be out of range....
As a GM tech, the only way I could diagnose these problems, especially C1233, was a snapshot with Tech II scanner......taking a test drive, doing ABS stops, observing data especially on turns......also having an old spare hub, can quickly diagnose a bad one, when connected to the harness while reading data and spinning it...
Excessive variation is usually the hub/sensor.......open/shorted could be the hub/sensor or harness, or in the case of water intrusion, BOTH......you can guess and change parts, which can be costly, or you go to someone who can do proper diagnosis.....
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