P1693 codes (SOLO) - Dodge Cummins Diesel Forum
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post #1 of 283 (permalink) Old 04-09-2009, 08:21 PM Thread Starter
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P1693 codes (SOLO)

I'm going to point out to everyone there is NO WAY to have just a P1693 code present during error code dumping. Yes the P1693 is a companion code and has no really meaning but...

P1693 Code Explained...
https://mopar1973man.com/cummins/art...n-module-r138/

"This code indicates there is more code present in the other computer" So if the P1693 is in the P PCU that means there is more codes present in the P ECU. So if there is a P1693 in the P ECU that means there is more codes present in the P PCU. Then even in rare cases seeing the P1693 code in both computers pointing out that both computers have codes. But there is NO WAY for the P1693 to be the only codes present during error code dump. It's totally impossible!

The reason I'm posting this is because it seem like everyone is canceling out at the first P DONE thinking its done. WRONG! There is TWO computers in the truck.

P PCU = Powertrain Controller Unit (Passenger side firewall)
P ECU = Engine Controller Unit (Driver side of engine block)

You should always see both P PCU and P ECU displayed and 2 P DONE's in the display.

Best to do all your code reading with a quality OBDII code reader. Yes, you can do the key trick for a poor mans method of checking for codes but only the 2002 model year is reliable for dumping all codes. 98.5 and 99 will not work at all. 2000 and 2001 are a 50/50 mix that you might get just the PCM with just a P1693 or see both the PCM and ECM. Hence where the P1693 Code problem stems from. What happens is the key trick will dump P1693 and then flip back to the odometer. So just best to use that quality OBDII code reader.

Now the other thing is a lot of people are getting error code from OBDII sites or from manuals with the scanners. I'll point out that any code over P1000 is a manufacture specific code that only applies to the that make and model of vehicle so please refer to a proper Factory service manual and get the proper codes. Still always best to refer to my code list with just the error numbers. This way you can get the proper diagnostic information for your problem.

The updated error code and diagnostic information...
https://mopar1973man.com/cummins/art...rror-codes_94/

This will help us diagnose your problem quickly and properly.

Updated: 02/08/2016
All links and information is current.
Mopar1973Man




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post #2 of 283 (permalink) Old 04-09-2009, 08:25 PM
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Hey Mike. Good post, I got a question, what if you get a code that clears itself after a few key cycles, will the 1693 still be there untill cleared?

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post #3 of 283 (permalink) Old 04-09-2009, 08:28 PM Thread Starter
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Once again the P1693 code cannot exist by itself. So if the problem code is gone so is the P1693 code too.

Also take notice the P1693 code NEVER shows up on a hand scanner either it ONLY displayed in the odometer window.

Like this posts...
https://www.cumminsforum.com/forum/98...ml#post1488367

https://www.cumminsforum.com/forum/98...ml#post1497402

It gets old... You find out everyone is shutting the key off at the 1st P DONE...

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post #4 of 283 (permalink) Old 04-10-2009, 10:53 AM Thread Starter
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BUMPING TO TOP...

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post #5 of 283 (permalink) Old 04-12-2009, 10:24 PM
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Moparman I got one for you, I check my codes with the key trick and was getting a 1693 p-done then back to the trip, I have never gotten more then one p-done before it goes back to the trip, just went out and checked it and the 1693 is gone but I still only get one p-done before it goes back to the trip. am I doing something wrong or worse yet is my truck doing something wrong? One more thing that I would like to pick your brain about, My abs and break lights are on and have been for a few hundred miles but in the last few days they started blinking and when breaking sometimes the pedel gets real stiff and feels like the abs system is kicking (surging) on for a sec. then back to normal breaking then back to the abs stiff pedel and so on and so forth. but after driving for a few tens of miles the lights stop blinking and were back to normal breaking till I shut the truck off, when I turn the truck back on the problam starts all over again.

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post #6 of 283 (permalink) Old 04-12-2009, 10:44 PM Thread Starter
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You should still see two listings...

1. P PCU = Powertrain Controller Unit
2. P Done
3. P ECU = Engine Controller Unit
4. P Done

Once again refer to the video on this page...
OBD II Error Codes

So if your seeing the first P PCU and the P1693 is present that means the P ECU has the code. (And visa-versa) So you might have to dig out a scan tool like a ScanGauge II or similar and check for the code.

Still in all the P1693 code will NEVER display in a scan tool and the P1693 code cannot exist by itself.

As for the ABS light blinking that could be a speed sensor going south on you ther is 2 sensors on the front axle (left and right) then 1 sensor in the rear. The rear sensor controls the speedometer. The 3 sensor must all match together other than that the ABS/BRAKE lights are tripped and a P0500 code (in the P PCU) so the P1693 code should be in the P ECU. (Thinking out loud)...

For code to self erase must clear 40 engine warm up cycles without the error tripping again. Engine warm up cycle is starting with coolant temps below 140*F and warming up beyond 160*F.

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post #7 of 283 (permalink) Old 04-13-2009, 08:48 AM
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Quote:
Originally Posted by Mopar1973Man View Post
You should still see two listings...

1. P PCU = Powertrain Controller Unit
2. P Done
3. P ECU = Engine Controller Unit
4. P Done

Once again refer to the video on this page...
OBD II Error Codes

So if your seeing the first P PCU and the P1693 is present that means the P ECU has the code. (And visa-versa) So you might have to dig out a scan tool like a ScanGauge II or similar and check for the code.

Still in all the P1693 code will NEVER display in a scan tool and the P1693 code cannot exist by itself.

As for the ABS light blinking that could be a speed sensor going south on you ther is 2 sensors on the front axle (left and right) then 1 sensor in the rear. The rear sensor controls the speedometer. The 3 sensor must all match together other than that the ABS/BRAKE lights are tripped and a P0500 code (in the P PCU) so the P1693 code should be in the P ECU. (Thinking out loud)...

For code to self erase must clear 40 engine warm up cycles without the error tripping again. Engine warm up cycle is starting with coolant temps below 140*F and warming up beyond 160*F.
i cycle the key like i'm sposed to, on off, on off, on but it only shows p done once...any idea what i'm doin wrong cuz it just flashes pdone once and goes back to the odometer reading

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post #8 of 283 (permalink) Old 04-13-2009, 09:13 AM Thread Starter
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So basically you saying that one of the computers is NOT coming on line to dump codes any longer. Now you going to have to watch and se which computer (P PCU or P ECU).

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post #9 of 283 (permalink) Old 04-13-2009, 09:48 AM
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Originally Posted by Mopar1973Man View Post
So basically you saying that one of the computers is NOT coming on line to dump codes any longer. Now you going to have to watch and se which computer (P PCU or P ECU).
see i'm just as confused as you are. it doesn't say p pcu or p ecu. it just starts flashing codes, says p done, thats it

i'm guessing that it's gonna be the pcm codes that i'm seeing since it's the tranny codes and speed sensor codes....i dunno why the hell the ecu codes don't flash lol

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post #10 of 283 (permalink) Old 04-13-2009, 09:57 AM
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Originally Posted by Mopar1973Man View Post
So basically you saying that one of the computers is NOT coming on line to dump codes any longer. Now you going to have to watch and se which computer (P PCU or P ECU).
hey man sorry i got the codes finally. forgot i had a smarty layin underneath my back seat

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post #11 of 283 (permalink) Old 04-13-2009, 10:01 AM Thread Starter
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Quote:
Originally Posted by milesdodgeboy View Post
see i'm just as confused as you are. it doesn't say p pcu or p ecu. it just starts flashing codes, says p done, thats it

i'm guessing that it's gonna be the pcm codes that i'm seeing since it's the tranny codes and speed sensor codes....i dunno why the hell the ecu codes don't flash lol
Something is wrong for sure...

Did someone replace a ECM or PCM module on your truck? Because the 98.5 and the 99 model year truck don't flash code to the odometer window but if some replace a module on you truck and used a older one it could be the cause of it? (Guessin' )

But at this point since the vehicle appears to run normally and not behaving badly I would ignore the problem for the most part and grab a good code reader to keep on hand.

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post #12 of 283 (permalink) Old 04-13-2009, 10:02 AM Thread Starter
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Quote:
Originally Posted by milesdodgeboy View Post
hey man sorry i got the codes finally. forgot i had a smarty layin underneath my back seat
So what are the codes?

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