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Old 05-13-2012, 07:33 PM   #1
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ABS light on no trouble codes set

I have a 2008 Safari Trek 29RBD. The ABS light came on and I checked for trouble codes with a scanner and there were no codes. Any ideas? Thanks Bob
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Old 05-13-2012, 07:36 PM   #2
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I have a 2008 Safari Trek 29RBD. The ABS light came on and I checked for trouble codes with a scanner and there were no codes. Any ideas? Thanks Bob
Is your scanner the kind that does ABS? Generally, only the Tech II will retrieve ABS info.
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Old 05-14-2012, 07:42 AM   #3
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Is your scanner the kind that does ABS? Generally, only the Tech II will retrieve ABS info.
rgreen45, That's true and why I recommend that owners have their vehicles scanned by a Tech II to resolve problems.

Running a Scan Gauge is great and it does help but it doesn't replace a Tech II.
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Old 05-14-2012, 07:57 AM   #4
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If the red "brake" light is on also it may just be low on brake fluid.
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Old 05-14-2012, 08:48 AM   #5
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I now have a ABS light on also 6months/2300 miles since brake recall completion. So what is Tech II ?
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Old 05-14-2012, 09:14 AM   #6
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It's a hi-tech scanner that GM dealers use,some independent shops have them if they can afford it.
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I now have a ABS light on also 6months/2300 miles since brake recall completion. So what is Tech II ?
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Old 05-14-2012, 09:15 AM   #7
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I now have a ABS light on also 6months/2300 miles since brake recall completion. So what is Tech II ?
A Tech II is "the" franchise diagnostic tool of all GM & Workhorse Authorized Service Centers. It is the 1st thing that a service facility should plug into the OBDII port on your motorhome to determine any problem.

The lowest common denominator in your case is that you should remove and re-insert the ABS sensors at each wheel end. (adjustment) You also could have a bad sensor & a Tech II would be able to immediately identify that. An end user ScanGauge (OBDII DTC scanner) will not be able to do that.
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Old 05-15-2012, 08:46 AM   #8
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So are these sensors on the individual brake back plates> Will I be able to remove them and test with a multimeter? I really can,t afford another trip to the RV center $$$$$$$$$$. IF not I guess a piece of electrical tape over the ABS light will have to do. Thanks
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Old 05-15-2012, 09:31 AM   #9
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So are these sensors on the individual brake back plates> Will I be able to remove them and test with a multimeter? I really can,t afford another trip to the RV center $$$$$$$$$$. IF not I guess a piece of electrical tape over the ABS light will have to do. Thanks
I am not even suggesting you go that far as to test them. Here are some of Oemy's Tech Tips in regard to ABS Sensors.

The ABS sensors are held in by a copper cage. To remove them just twist and pull them out. Clean the with a rag and some brake cleaner. Add a dab of lithium grease and reinstall. Just make sure they are on the way in the bore and seated.

After you have cleaned and lubed all the sensors you need to reset the ABS system. Start the engine but do NOT step on the brake as it takes about 20 secs for the system to reset. If all else fails you will probably have to take the rig for a short trip before the ABS system is reset and the ABS light will go out. If this does not fix the problem you may have a bad sensor. You can check them with an ohm meter. Replacements can be purchased from OEM-Engineering.

ABS Sensor

ABS Sensor Removed

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Old 05-31-2012, 06:08 PM   #10
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A couple of years ago, I had problems with the ABS light coming on.
I took it to a Chevy dealer and Workhorse service center. Neither one could locate the problem. I read somewhere on this forum that you should have around 1200 ohms on each sensor. I checked all four sensors. I had about 1200 ohms on all but one that read about 200 ohms. I ordered a new sensor and installed it. After I first installed it the light stayed on. I drove the MH around the block and the light went off (reset itself) and has never came on again. You might try this ohm check.
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Old 06-01-2012, 05:18 PM   #11
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Thanks guys, My ABS light has been intermittent since the recall. The original owner told me last fall. It comes on at start up then goes out almost all the time after moving a bit I have found out.. The pictures and ohm meter reading are just what I need. Hum… now I need some brake cleaner and a dab of lithium grease.

Break cleaner? What is that? Acetone?

Thank you, thank you, thank you for this information.

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Old 06-02-2012, 08:29 AM   #12
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Break cleaner? What is that? Acetone?
Al, Nope.

Please find attached the MSDS for Brake Cleaner.
Attached Files
File Type: pdf MSDS.pdf (62.4 KB, 83 views)
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Old 06-02-2012, 08:44 AM   #13
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Had my light come on during a fears wind storm... pulled the fuses and plugged 'em back in... it reset and no more light. Try simple things first.
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Old 06-02-2012, 03:51 PM   #14
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Try simple things first.
Yes I agree.
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