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

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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

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 2

There are 4 possible reasons why the Tekonsha Primus, #TK90160, is telling you N.C. 1. Trailer not connected to tow vehicle. 2. Trailer connected with open circuit on brake line. 3. Trailer connector disconnected or corroded. 4. Loss of trailer brake…

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Answer 3

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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Answer 4

There are a couple of reasons why your Primus IQ trailer brake controller #TK90160 could be flashing. It could be a bad ground connection, an overload or the angle of the controller not accurate for use. The angle is an issue because it utilizes an…

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Answer 5

There are no "54" or "oc" codes on the Tekonsha Primus IQ Trailer Brake Controller part #TK90160. I have attached a list for you of the possible error codes that the Primus IQ can have. It sounds like you may have mistaken the…

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Answer 6

If you click on the link that I have provided for the installation instructions, you can see the troubleshooting chart just below the installation details. The SH code that you see on your Tekonsha PRIMUS IQ brake controller indicates there is a…

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Answer 7

As long as the P3 is in functioning order, the 3015-P is pinned properly and you installed it into the correct port under your dash the controller should have turned on and you should get a display reading. I would recommend you double-check to be…

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Answer 8

It sounds like you have a Time-Delayed controller like the Tekonsha PowerTrac #39523. If this is the case then what is happening is that the controller sends back the full amount of power that you have it set at when you first press the brake pedal…

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Answer 9

The Tekonsha Plug-In Wiring Adapter, #3015-P, will not work with your 2007 Chevrolet Avalanche because General Motors quit offering the plug in type connectors on trucks and SUVs with a factory tow package in 2007. Instead, you will find a bundle of…

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Answer 10

Stan, so it sounds like you want to go from surge to electric over hydraulic braking. What you need to do then is get an actuator #HBA-10 for drum or #HBA16 for disc, a brake controller like the Tekonsha Prodigy P3 #90195, and then finally lock out…

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Answer 11

Sounds like the 12 volt accessory circuit is shorting out to the brake output circuit on the trailer wiring. Go over the wiring and look for any cut or exposed wire between these two circuits and fix as needed. If the stock trailer had a 6-way…

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Answer 12

The easiest first step here would be to try the trailer on a different truck, and see if the same problem occurs. If the trailer brakes are free until the trailer is plugged in, I suspect that something is mis wired. I would suggest examine the…

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What Do the Codes Displayed on the Primus IQ Mean

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