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Old 01-05-2005, 04:40 PM   #1
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Yesterday, I started up the engine on our motorhome and the ABS light stayed on and will not go out while the engine is running. Any suggestions on what is wrong?
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Old 01-05-2005, 04:40 PM   #2
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Yesterday, I started up the engine on our motorhome and the ABS light stayed on and will not go out while the engine is running. Any suggestions on what is wrong?
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Old 01-05-2005, 05:17 PM   #3
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On many ABS units, it is common for the light not to go out until you reach 6 MPH.
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Old 01-05-2005, 05:49 PM   #4
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As bpe1 says, try moving it before deciding something is broken. It may well cure itself. However, most ABS systems run a set of self-diagnostics when the key is turned on and it is possible yours has detected a problem, such as the inability to get feedback from each wheel speed sensor. A brake technician can read a diagnostic code from the ABS computer to find out why the warning light came.

You need not fear total brake failure, though. The ABS light means the anti-lock feature may not operate, but you still have full braking capability. The coach is safe to drive in normal road conditions.
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Old 01-06-2005, 05:12 PM   #5
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We had the same problem. It turned out to be a blown brake light fuse. Apparently the brake lights send a signal to the ABS computer.
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Old 01-09-2005, 06:57 AM   #6
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<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>Originally posted by RV Roamer:
As bpe1 says, try moving it before deciding something is broken. It may well cure itself. However, most ABS systems run a set of self-diagnostics when the key is turned on and it is possible yours has detected a problem, such as the inability to get feedback from each wheel speed sensor. A brake technician can read a diagnostic code from the ABS computer to find out why the warning light came (on).

You need not fear total brake failure, though. The ABS light means the anti-lock feature may not operate, but you still have full braking capability. The coach is safe to drive in normal road conditions. <HR></BLOCKQUOTE>

Very well put, Gary! I agree 100%.

I had the same thing happening on my rig for awhile and found the light would go out and stay off after I started to drive (about 6 mph as bpe1 mentioned). Since I am a GM technician I plugged in the scan tool and found a history code for the L/R wheel speed sensor. I looked at the wiring and connections at the wheel and all appeared OK. I have a friend who used to work at a GMC dealer and he told me that there were some vehicles that left the factory without having their brake computers properly calibrated. There is a setup procedure that must be performed, using a scan tool, to assign the proper "Tire size calibration" in every new or replacement EBCM (Electronic Brake Control Module). I checked mine and it had NOT been calibrated. (This must be done with a GM scan tool linked to the ABS computer.) I calibrated my proper tire size into the computer and cleared the diagnostic code and the ABS light hasn't come back on since.

I imagine you'd not be able to do this yourself, but could ask your local WH dealer to check it.
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Old 01-12-2005, 01:09 PM   #7
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Rodger
Low brake fluid will also cause the ABS light to come on.
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