C1225 RF Excessive Wheel Speed Variation

[Sharondippity]

I did a little burn out today at the metering light to get on the freeway this morning. Tee hee. Lo and behold, I got a light on my dash 20 minutes later to check my ABS. I pulled the codes and I reset it.

Do you think it's because of this one issue?

 

[David-F]

See if the code comes back it will set if the brake control module sees more than 13mph difference between wheel speed sensors seeing how you did a burn out it's very possible that the rear tires were going more than 13moh faster then the right front and cause the code to set if not in most cases it would be the wheel speed sensor which is part of the bearing.

David Fulcher

 

[Sharondippity]

Okay I will post results either way. I didn't realize there was some slight gravel when I punched it at the meter light. Wheels spun just a little bit. Okay a little more than a little bit.

Part of the bearing? Does it make a squeaky noise when it's going out?

 

[David-F]

No the sensor is iinside the bearing and the bearing can be good but have a problem with the sensor. Again just keep an eye on it and see if it happens again there are two possible casuses one the sensor(most lilely) and the harness that goes from the sensor to the body harness, you can do some testing with an ohm meter but it's not 100% just a quick check.

David Fulcher

 

[gmjunkie]

If it comes back,be sure and check the short extension wire from car harness to the wheel!!I've had 3 C5's lately that the plug pins had a broken wire and wasn't getting any continuity!! It would really Inhale to buy a $350.00 wheel bearing and it be the wire plug!!! :W:W

 

[David-F]

In most cases if there is an open in that circuit it will set a different code but that is why I said you can use an ohm meter to check for that. You check the ohms at the sensor then plug the sensor in and check the ohms at the body harness connector it should be almost the exatly the same and whils you testing at the body harness wiggle the harness to check for brakes in the harness. If you take sewwing needles and soder wire to them you can go to Radio Shack and get banna cligs you can install on the other end of the wire then you can hook it directly to the meter the sewing needles if small enough will fit just nicely into the terminals with out any damange so you can get a good reading.

David Fulcher

 

[navy2kcoupe]

Sharondippity, I've seen where code C1225 has been called out as a RIGHT front problem as well as a LEFT front problem. If C4C5Specialist sees this post, perhaps he can direct us to someplace where the CORRECT codes can be found. The list I have (from a forum post) shows C1225 as a right front problem, but C4C5Specialist says "that's not right", and now I'm wondering if there's any more "discrepancies" in the list of codes that I've got. What do you say C4C5 specialist? Is there someplace where we can go to get the correct "GM approved" codes? Thanks for any help you can provide. My 2000 coupe just threw a C1225 today, and I would at least like to be working on the correct side of the car :duh to troubleshoot this problem.
Andy

 

[geekinavette]

I did a little burn out today at the metering light to get on the freeway this morning. Tee hee.

"accidently", right? :L

Bill

 

[c4c5specialist]

Hi there,
That is correct, the C1225 is for the LEFT FRONT wheel speed sensor excessive variation.
As far as conditions, Normally, if the burn out created the failure, you would see BOTH C1221/C1222 showing that both front tires were NOT spinning when the rears were moving.
Now, the specification is 10 mph variance over rotational signals given to the EBTCM.
So, that being as it is, if you were to go over very bumpy roads just prior to this code setting, your C1225/C1226 would show, because of flex in the wiring harness connections to the EBTCM. This is the MOST common cause of these codes, the wiring harness going from the sensor to the connection at the front subframe.
For the last 72 harnesses I have done, I have done only 1 sensor/hub assembly.
Allthebest, c4c5

 

[navy2kcoupe]

Hi there,
That is correct, the C1225 is for the LEFT FRONT wheel speed sensor excessive variation.
As far as conditions, Normally, if the burn out created the failure, you would see BOTH C1221/C1222 showing that both front tires were NOT spinning when the rears were moving.
Now, the specification is 10 mph variance over rotational signals given to the EBTCM.
So, that being as it is, if you were to go over very bumpy roads just prior to this code setting, your C1225/C1226 would show, because of flex in the wiring harness connections to the EBTCM. This is the MOST common cause of these codes, the wiring harness going from the sensor to the connection at the front subframe.
For the last 72 harnesses I have done, I have done only 1 sensor/hub assembly.
Allthebest, c4c5

c4c5specialist, I've got part number 12163714 as the number for the harness. Is this the right number for this part, and are the left and right sides interchangable? I'd really like conformation on the part number before I order one. Lastly, how hard is this part to change? Any special tools necessary? I've owned a Vette for a total of 16 months, and haven't had to do anything to it yet, so I'm still wet behind the ears on the maintenance aspect of the C5. Thanks in advance for any assistance that you can provide.
Andy Anderson

 

[c4c5specialist]

Hi there,
The correct sensor harness is 10332527 and they are both for left and right sides.
Normally, all you will need is a pair of needle nose pliers to separate the plastic retainers from the wiring to replace the harness.
Once the front wheel is OFF, you can access it all very easily.
Allthebest, c4c5

 

[navy2kcoupe]

Hi there,
The correct sensor harness is 10332527 and they are both for left and right sides.
Normally, all you will need is a pair of needle nose pliers to separate the plastic retainers from the wiring to replace the harness.
Once the front wheel is OFF, you can access it all very easily.
Allthebest, c4c5

Thanks a bunch! I'll get one on order.
Andy

 

[Sharondippity]

The code has not reappeared in over 200 miles after being reset. Of course now I'm jinxing myself....

 

[SANOLS1]

The code has not reappeared in over 200 miles after being reset. Of course now I'm jinxing myself....

If you're like me, as soon as you're confident it is not going to re appear you’ll go out and do another burnout to see what happens.

Let us know how that works out.