Need Diagnostic Help! DTC C1380

Hello y,all! I've posted on this forum before but I seem to have lost that account...

For about the past year my 2010 5.7 4x4 CM has had an issue with (I believe) the ABS system. It started while the truck and I were on an extended stay in South Dakota and one cold day I noticed my TRAC light, BRAKE light, and ABS light were on. The truck continued to drive perfectly normal (almost even better without ABS) and there were no codes that I could read. At first the lights were off most of the time, sometimes only ABS & TRAC, sometimes all three. I figured it was some sensor screwing up with the ridiculous weather you northerners deal with . Now after coming back to Texas I've driven the truck some ~10,000 miles with this issue in all variety of weather and the lights persist. They are on most of the time now, but sometimes they go off. I've noticed that when I first start the truck and reach 12-15 mph the lights will either remain on, or I will hear the ABS pump run for a second and the lights turn off (for a few miles at least). I know these trucks run a 'test' of the ABS pump at 15 mph right about the speed your doors automatically lock. It must also run these tests periodically while driving, hence why my lights always come back on. I tried Zero Point Calibration, it makes the lights go off but as soon as I hit 15 mph they're back on.

I was able to borrow a scan tool that could pull ABS codes and even run systems tests. The truck gave me C1251. I then ran a test for the ABS pump and sure enough it would not run. My best guess at this point is that my pump is working intermittently. It is either "failing" or "passing" the ABS test every time I start my truck and thats what makes the lights so intermittent. Bottom line is my ABS, TRAC, and VSC are not working because of this and I don't think my truck will pass its upcoming inspection with all the lights. I guess its a faulty relay somewhere inside the controller that is integrated into the ABS Pump (why couldn't toyota have made it an external relay?!?).

Where I need help is finding a good part number for this dang thing! There are like 7 varieties of pump that Toyota stuck in these trucks.
The faulty part in my truck is 44500-0C270, but I can hardly find any online. It looks like that was only in late 2009 to early 2010 trucks?? Perhaps it was phased out because it was having issues.
It seems like these 4 tundra configurations: RC, DCLB, DCSB, CM all have their own part number for the ABS pump.

My truck is a CrewMax, What part number should I look for? Should I go with the exact one or a pump off of a newer 2011-2013 truck? All help is appreciated!

 

Usually it is only the module on the side of the pump that is not working. You can remove the module and have it resoldered (or attempt it yourself). What happens is that over time the connections on the circuit board break and the modules stop functioning. On eBay, there are sellers that offer to repair the modules for ~150ish (just search ABS module repair). I did this on my F-150 and it worked like a charm. You send it to them (usually a place in Cali) and they will resolder it and ship it back within a week.

On our Sequoia (same as 2nd gen Tundra), I struggled a lot trying to get the module off as the modules fasteners are facing towards the body and there is almost no room to get it off. I ended up thinking it would be easier to just buy a used ABS pump off of eBay for $300 (take-off from a wrecked Tundra). The part number did not match exactly, but was one year newer and it fixed the problem with no issues. Was able to function test it and all.

FWIW, I searched eBay on your part number and there are some active listings with it. You likely will not be able to find a new OEM one, so my suggestion is to try and get the module repaired first. It definitely would be easier doing that as you won't have to mess around with any brake lines and I can confirm it gets very messy, very fast removing the ABS pump.

 

FYI, here was my old module/pump. The bottom two torx are the hardest to get out, need a T-20 to do so. In the engine bay, these are facing the sidewall with very little room to work in. I think it can be done though without removing the entire pump.

 

UPDATE: I was able to get an OEM pump out of a wrecked 2011 truck with the same specs as mine, the part numbers did not match exactly but the part was identical. I only paid $150 for the pump which was a bit better than the $1400 (w/o labor) that the dealer quoted me. I installed the new pump today, not that difficult of a job it only took me a couple hours. Did a ZPC and took it for a test drive to verify that ABS works and it did.

However, while the ABS and BRAKE lights did turn off and the C1251 code is gone, I still have the SLIP INDICATOR light and code C1380 "stop light control relay malfunction". First thing I did was clear the code, but it comes right back. Second thing I did was verify that all three brake lights work, and they do. Additionally, with a stored DTC I cannot use the trac button to activate the auto LSD or cycle through the ATRAC and VSC modes which is pretty annoying.

I was unable to find much on this code, and there are no references to C1380 in the service manual I have which is very strange. Any ideas for the next step in the diagnostic process? I'm really hoping this could be a relay or corroded connection.

2010 5.7 4x4 CrewMax

 

Trying to revive this thread as I still have this issue some 15,000 miles later !! Slip Indicator light on all the time!

 

The other two lights are still off though right? I'm trying to remember if I had to do some resetting when I replaced mine to resolve everything.

 

Yes. Other lights are off. The code will not clear. ABS works but I’m not sure if TRAC and ATRAC are working (I’m pretty sure they aren’t because I can go sliding around whenever I want) and i cannot use any of the traction control modes. I also think my truck is denying 4x4 requests because of the stored DTC code.

 

Abs module needs to see brake signal. Need to look at the wiring diagram and confirm 12v is getting to the mdule on the stp pin when brake is applied. It is possible that the stp pin location is different on the mdel you installed.