What Do the Codes Displayed on the Primus IQ Mean

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Question:

Explaination of codes on display

asked by: Marshall H

0

Expert Reply:

After installing your Tekonsha Primus IQ Trailer Brake Controller # TK90160 you should see the following two-digit display: n.c. which means "power to brake controller without trailer connected." This displays for 15 seconds then changes to two dots ( . . )

With the trailer connected you will see .c displayed which means "boost feature not engaged," or .c. for "boost feature engaged." A display of b.1, b.2, or b.3 shows the boost level setting. See the chart at right of typical boost settings.

A two-digit display will show the power output. So 5.4 denotes the voltage output to the electric brakes. The range is 0.0 to 13 volts.

The display .r means reverse.

A blank display means there is power to the brake controller but the display is in power saving mode (no motion or activity for at least 15 minutes).

Take a look at the troubleshooting chart at right which explains the error codes. I have also included the installation instructions which contains more information about the brake controller display.

expert reply by: Chris O

0

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Steven J.

6/14/2024

SH code on controller and po when brake pedal depressed

Reply

Bud M.

6/14/2024

@StevenJ So we know the SH code is a short on the brake wire running out of the controller to get to the trailer brake controller. I have never seen a PO error, if you meant to type PL that says there is a power interruption when pressing on the brake pedal. If you have a PO error please let me know what controller you have so I can further investigate that error. The combination of these errors would lead me to first want to bench test the controller to verify if you do have wiring issues on the truck or if you can replicate the issues on a bench test then you know the controller is bad. To bench test the controller you will connect the power and ground to the battery terminals. The blue output wire you can run to a 12 volt incandescent light bulb so you will be able to see power getting to it when you touch the red wire to the 12 volt power representing pressing on the brake pedal.

Reply

Steven J.

6/14/2024

@BudM Yes it probably was a PL if my memory serves me correctly. Strange point is it works sometimes and other times Showing both codes. Trailer is 10 years old and I have been questioning the pig tail on the trailer and even one on my truck but other trailers I pull with the truck doesn't have brakes so it's been hard to isolate.

Reply

Bud M.

6/14/2024

@StevenJ Intermittent problems like you are have are almost always to do with the wiring or the connectors. As these parts are moving around ever so slightly when you drive that is likely why you get the problem from time to time. You might consider trying out another truck or trailer to see if you get the issue to replicate on either the truck or trailer to help you know where to start looking.

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Bill B.

7/18/2024

Sh flashes and then NC at highway speeds What could be causing this

Reply

Bryce D.

7/18/2024

@BillB Bill I'd say there is an issue with either your brake line or your brake magnet ground. with the brake line, there could be an open circuit somewhere, or the ground for your brake magnet is bad. These are the two things I'd recommend checking and that could be causing the N.C error code.

Reply

Bill B.

7/18/2024

@BryceD this trailer has two axles so four magnetic brakes. None working. So the problem would be before the brakes?. Or one bad ground shuts them all off. Right now SH is showing while traveling and o L while stoped.

Reply

Bryce D.

7/18/2024

@BillB So since you're also seeing an S.H error that leads me to believe that it's definitely a short in the brake line. So I'd start before the brake like you said and see if you can track down that short.

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See All (8) Replies to Bill B. ∨

Answer 1

Based on your axle info the correct bearing kit would be the part #BK3-310 for a kit that includes both bearings #LM67048 and #25580 as well as a grease seal.

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Answer 2

For a 5,000 lb Dexter axle the correct replacement grease seal would be the #GS-2125DL.

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Answer 3

Yes, the temperatures you mentioned are normal. If you were getting over 200 degrees that would be a bad sign. But typically if all of the hubs are the same temperature you're good and it's only really an issue if one of the hubs is hotter…

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Answer 4

You might have one brake that's adjusted tighter than the other. That's really the only thing I can think of that would cause one hub to get hotter than the others when brakes are applied. You want your brake controller to be set so that it…

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Answer 5

A bad ground can cause just one brake assembly to get hotter only as a result of the assembly with the bad ground not engaging, which in turn causes the assembly on the other side to do all the work (thus get hotter). It appears though that both…

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Answer 6

I sent this to Dexter and this is what they sent back: I checked the number and it not a good hub number, and wheel tried pulls up 3,500 sprung axle from 2006 that doesn’t use a Nev-R-Lube hub. I would ask for confirmation on the number or some…

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Answer 7

Hey Jeff, thanks for reaching out! From the information you gave me, I'm pretty sure you have 3.5K axles on your trailer so you'll need the following: - etrailer Electric Trailer Brakes - Self-Adjusting #AKEBRK-35-SA (1 set per axle) -…

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Answer 8

It sounds like the problem is corrosion on the trailer 7-way brake output circuit which is causing the controller to only show an intermittent connection. Try cleaning off this pin on the 7-way with some fine grit sandpaper. Testing the brake…

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Answer 9

The flicker you are seeing on the brake output circuit of your vehicle is normal. Brake controllers will lightly pulse their output circuit to check to see if a trailer is connected due to the amperage draw of the brake magnets. So what this all…

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Answer 10

I would check the magnets for wear before going on to test them with a meter. If the magnets show abnormal wear or if you can see the windings beginning to show through the friction surface of the magnet then they will need to be replaced. To further…

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Answer 11

To correctly measure a leaf spring, you'll want to jack the trailer up on jack stands so the axle is hanging freely, then measure directly across from the center of one spring eye to the other, as shown in the provided diagram. The height of the…

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Answer 12

Based on my research, the 023-326-00 number you found at the back of your existing brake assemblies refers to the Dexter 12 inch x 2 inch electric brake assembly that is designed for 6,000 pound axles and features a 5 bolt mounting flange pattern. If…

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What Do the Codes Displayed on the Primus IQ Mean

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