Intermittent limp mode. 1391 code - DodgeIntrepid.Net Forums - Dodge Intrepid, Concorde, 300m and Eagle Vision chat
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post #1 of 29 (permalink) Old 11-27-2016, 08:53 PM Thread Starter
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Intermittent limp mode. 1391 code

While driving the car, it will go in and out of limp mode.

Also, last night with the temp set at 75, it started blowing cold air. Turned the setting up to 85 and all is good. Back to 75, it's cold.


91k miles. 99 LHS.

Last edited by KevenP; 11-27-2016 at 08:56 PM.
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post #2 of 29 (permalink) Old 11-27-2016, 10:27 PM
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Most often, erratic heat output is due to coolant being a little low. Check level, refill, and bleed according to the FSM procedure. Use *only* G05 (HOAT) type antifreeze. If coolant is low, you need to figure out where it's going.

Does the temperature gage read normal?

Your limp mode probably is unrelated to the cabin heat issue. Often it is a bad transmission speed sensor - there are two. If the speedometer reads correctly while it's in limp mode, it's not the outputspeed sensor. If the speedometer reading gets erratic or drops to zero, it's either the output sensor itself, or a wiring or connection issue in the output sensor circuit - most likely the sensor. The sensors are not expensive - might as well replace both while you're underneath the car.

Any codes?


'98 LXi - Later Concorde gages (black w/ chrome rings)/'99 LX - LHS gages (white) - HIR bulbs
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post #3 of 29 (permalink) Old 11-28-2016, 01:38 PM Thread Starter
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Thanks Peva.
I'll check the coolant level and system. Gauge reads normal.

I replaced both input and output sensors on the trans. Maybe I should have bought them from Chrysler?

It's also throwing the 1698 code.

Last edited by KevenP; 11-28-2016 at 01:46 PM.
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post #4 of 29 (permalink) Old 11-28-2016, 03:17 PM
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You've got an LHS so you have an Automatic Temperature Controller. It's possible the ATC In Cabin Thermistor is clogged with dirt/hair balls/etc. This can cause a variation in the cabin temperatures.
You can take a can of compressed air and blow it out without taking anything apart. The thermistor is located in the ATC head right below the large fan speed knob on the left. You'll see 3 horizontal slot openings. The thermistor is right behind the slots. Just blow compressed air in there.

For the transmission P1698:

P1698 (M)

No CCD/J1850 Message From TCM

No CCD/J1850 messages received from the electronic
transmission control module (EATX) or the Aisin
transmission controller.

No communications with the TCM on the PCI bus. Either a faulty TCM. A wiring problem or wiring connection problem at the TCM. Check for corrosion or loose connections at the TCM

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post #5 of 29 (permalink) Old 11-28-2016, 03:36 PM Thread Starter
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Maybe I'm reaching here, but............ Could my timing belt have skipped one tooth? The car skips and bucks and the tach jumps when I get over 4000 rpm.
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post #6 of 29 (permalink) Old 11-28-2016, 03:40 PM
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Did you read my above post regarding the P1698 code? When that happens the TCM goes offline and the transmission goes into limp mode. It's possible that whatever is causing the PCI Bus Comm issues with the TCM is affecting the other modules like the PCM.

Check your codes again to see if anything else comes up.

As far as the timing belt....how many miles are on the car and when was it last changed?
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post #7 of 29 (permalink) Old 11-28-2016, 04:20 PM Thread Starter
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Yes, I read your post.

It's odd to me that it will go in and out of limp mode while driving it. Don't have to stop or shut it off to go back to normal.
Check engine light follows with the limp mode.

91k miles on the original timing belt.
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post #8 of 29 (permalink) Old 11-28-2016, 05:11 PM
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Again the P1698 is the PCI Bus losing Communications with the TCM. Transmission Control Module. When that happens the transmission goes into Limp Mode because it's not receiving any commands from the TCM. It doesn't know what to do so into Limp it goes.

The PCI Bus communication transfers inputs/outputs from all the Electronic Control Modules. When the TCM drops offline the CEL comes on and the transmission automatically goes into limp mode.
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post #9 of 29 (permalink) Old 11-28-2016, 05:14 PM
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And you're way overdue for a timing belt anyway. There's a time limit besides the mileage. You're overdue by about 7 years even with low mileage.

Take a look at the TCM and it's connections. 1999-2000 TCM should be pretty cheap at the junkyard and don't require any programming. Don't bother with 1998 or 2002-2004. 2001 might work also.
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post #10 of 29 (permalink) Old 11-28-2016, 06:41 PM Thread Starter
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It goes in Wednesday. For the timing belt, water pump ect.....

Will try a different TCM. Did I read correctly on the forums that a PT Cruiser TCM will work? Supposed to improve shift points.
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post #11 of 29 (permalink) Old 11-28-2016, 06:50 PM
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That was the Plymouth Prowler TCM you read about. And they're rare and more expensive than a standard LH TCM. There aren't any standard plug in TCMs that do anything to the shift points in your year car. Just find a 1999 or 2000 TCM and get your car reliably derivable again. Also make sure it comes from a car with either a 3.2 or 3.5 engine. If you get one from a 2.7L car your speedometer will be off.
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post #12 of 29 (permalink) Old 11-28-2016, 07:39 PM Thread Starter
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Thanks Ronbo.
New to the LH cars, not Mopars.
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post #13 of 29 (permalink) Old 11-28-2016, 10:35 PM
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Quote:
Originally Posted by Ronbo View Post
You've got an LHS so you have an Automatic Temperature Controller. It's possible the ATC In Cabin Thermistor is clogged with dirt/hair balls/etc. This can cause a variation in the cabin temperatures.
You can take a can of compressed air and blow it out without taking anything apart. The thermistor is located in the ATC head right below the large fan speed knob on the left. You'll see 3 horizontal slot openings. The thermistor is right behind the slots. Just blow compressed air in there...
There's also a tiny little fan right behind the thermistor to ensure that air sampled from the cabin blows over the thermistor. The dust ball that Ronbo mentioned can stop that fan from spinning. But his solution of blowing air thru the slits takes care of the thermistor and fan at the same time.

For the TCM, exactly right about '99 or '00 only. And I'd go with a '00 over a '99 because there was a firmware update in the middle of '99, so if you get an earlier one, unless it's been reflashed with the later firmware, it can have some annoying shift characteristics (what's called "bump stop").


'98 LXi - Later Concorde gages (black w/ chrome rings)/'99 LX - LHS gages (white) - HIR bulbs
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post #14 of 29 (permalink) Old 11-28-2016, 10:46 PM
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Peva taking my Glory again as usual!
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post #15 of 29 (permalink) Old 12-12-2016, 02:17 PM Thread Starter
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Update:
Installed new OEM MoPar CPS and CKPS. Drove 4 blocks and car died. Could feel the engine lose one cylinder at a time. Blew the 20 amp TCM fuse also. Checked the codes and it showed P0340, P1289 and P1391.

Replaced the CPS and fuse, car started right up, so I headed home.

Another 6 blocks and it died again. Replaced the CKPS, it started right up, so I made it home.

Cleared the codes and checked again. Just the P1391.


Just a side note, ever since I bought the car, it runs really rough in the mornings (when cold) like a carb motor that doesn't have choke adjusted right.
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