HELP abs code 51. What do I fix ?

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tromz

tromz

10 Year 15 Year
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Feb 9, 2009
Threads
100
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897
Location
Chesapeake,VA
abs light is showing code 51 actuator circuit or whatever it says. How do I fix it. The FSm just shows removal
Thanks
 
So is there simplistic way to swap it out n stuff an have the light off?
 
Nothing. Cleaned it up got some new sensor wires. Same code. What to do?
 
My best friend and I both had this code @tromz and we both replaced the ABS pumps and it cured this ABS code. Fairly easy to change. Bleeding is the worst part. I changed the master cylinder while I was in there. $60 for a new Asian MC. Hope this helps.

Jason
 
The actuator motor you replaced. Or which part. master cylinder has already been replaced
 
I replaced both pump and master. Didn't have to do the master to get the abs light to go away. Just figured while I had the hard brake lines off it would be another baseline replacement. Rock Auto had a great deal on the Asian brand master.
 
That pump is expensive. Where did you locate one
 
Specter wanted like 1000 bucks
 
Before you change the pump, try jumping it directly using a fused jumper lead.
In most cases, you can tap the power wire quickly on 12v while banging on the pump motor to break it loose.
Once it starts singing, cycle it on and off for a few seconds at a time, then clear the code and you should be good to go.

abs.webp
 
98 SNAKE EATER said:
Before you change the pump, try jumping it directly using a fused jumper lead.
In most cases, you can tap the power wire quickly on 12v while banging on the pump motor to break it loose.
Once it starts singing, cycle it on and off for a few seconds at a time, then clear the code and you should be good to go.

View attachment 3939172
Click to expand...
Not getting any movement or noise when applying voltage per the pins
Any advice
 
thelal said:
Not getting any movement or noise when applying voltage per the pins
Any advice
Click to expand...
Are you getting a click or a little spark from the wires when touching to positive lead?

If so, it may be shorted.

The pumps are notorious for shorting out due to rust scale in the endbell.

Here's one from a junkyard before and after cleaning

20250926_191420.webp
20250926_191424 (Medium).webp
20250926_193616.webp
20250926_193619.webp



Might be worth a shot to remove yours
 
Here's a post that I made on this same topic / fix:

jpoole

Post in thread 'ABS DTC code 51'

I wanted to share a relatively easy fix for code 51 that may apply in some situations. On my '97 I noticed the ABS light earlier today and pulled the codes after a general inspection and test of the CDL, etc. The code that came back was 51 so I then hot-wired the abs pump to see if it would turn over with direct power applied. This is something that I do during brake bleeding so I was familiar with how the pump should sound. When I hot-wired the pump the sound/feel of the pump lead me to believe that motor was ok electrically but blocked mechanically, which turned out to be the case.

I...
  • Like

there is another contributor to the thread confirms that the motor can be cleaned up without removing the pump/breaking the brake lines or needing to do a full re-bleed.

H

Post in thread 'ABS DTC code 51'

jpoole said:
Update, edited with correct terminology.
Click to expand...

jpoole said:
Big Shout out to @Jpoole, I Fixed my ABS this weekend using his method of removing the stator housing from the ABS pump and cleaning out the rust particles that were jamming the motor. So first I obtained a used unit that was locked up so I had nothing to loose, removed that stator housing from the motor and yup, it was rusty enough to jam the motor but not horrible, cleaned it all out and reassembled and success! When bench tested by jumping the harness I got it to spin over....Ok, now onto the vehicle....I still didn't want to break...
Click to expand...
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98 SNAKE EATER said:
Are you getting a click or a little spark from the wires when touching to positive lead?

..
Click to expand...
Not getting anything; tried tapping ABS unit but no difference
Putting car to ON - see ABS come on and then out after few secs. Not moved car yet but suspect will trip again (code 51) once move a few feet
Cleaning up rear sensors (checked fronts & cleaned - both fine); both have lots their plastic 'tips' so putting on an epoxy layer.

Thanks for pictures. will check out post.
 
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