2008 CRD PCM & Wiring Harness Problem - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > WK Grand Cherokee & XK Commander Forum > 2008 CRD PCM & Wiring Harness Problem

Introducing MONSTALINER™ UV Permanent DIY Roll On Bed LineSteering and more from Ruffstuff!The Original 3/8" Ruffstuff Diff Cover!

Reply
Unread 08-26-2013, 04:15 PM   #1
MEFISHTO
Registered User
2008  
 
Join Date: Aug 2013
Location: lafayette, louisiana
Posts: 5
2008 CRD PCM & Wiring Harness Problem

A little battery acid leaked on the harness and PCM. Dealer says thousands and thousands to repair.

They literally told me, "We'll need to pull the engine out to fix it properly. That will involve replacing three "computer" modules and all wiring harnesses. Then we'll place the engine back into the vehicle". When they told me the price, I nearly passed out.

I then asked what the least expensive option would be and they mentioned hard-wiring the harness to the PCM for a measly 3K

Really?

I have read some one and two question-answer posts here and there but hope to find real answers here.

I am very capable mechanically but not a professional.

MEFISHTO is offline   Reply With Quote
Unread 08-26-2013, 04:35 PM   #2
BAH101
Registered User
2008 WK 
 
Join Date: Jan 2009
Location: Thunder Bay, Ontario
Posts: 724
Did it actually cause damage? You could flood the area with baking power and water, that will neutralize the battery aid, then use an electrical contact cleaner to remove moisture from the connectors.
__________________
2008 CRD QDII, OME HD, Pintlers wheels with 265/70/17 Goodyear Silent Armour's, Jeepinbyal UCA's. 4XGuard Front guard, Side Guard, belly guard, Matrix HC. GDE ECO Tune w/ delete.
BAH101 is online now   Reply With Quote
Unread 08-26-2013, 04:48 PM   #3
sickchilly
Registered User
2010 WK 
 
Join Date: Jan 2008
Location: Seattle, WA
Posts: 207
Some partial truth here depending upon how extensive the damage is on your particular vehicle. I'm going through a very similar situation with mine...

On mine, battery acid had gotten into the main PCM connector at some point in its previous life (the PCM is below the battery tray) and corroded it from the inside out. When they removed the PCM connector, several pins came out of the PCM with it! The PCM itself is just under $700 and only a dealer can program it and tune it to the CRD motor.

The engine wiring harness on mine also had some chaffing further up where it crosses the AC hard lines. And further to that, my swirl valve was throwing codes because hot oil had cooked that connector and the 5v reference line was shot on the harness. The engine wiring harness is around $700, the swirl valve motor is around $250. If they break the fragile swirl flap linkages doing the motor replacement, it's just under $500 each for new intake plenums. Some places include new intake plenums in the quote because there's a good chance they'll break them or replace them at the same time because it's easier.

Retail prices seem to have gone down dramatically on these parts recently. Back when I got my quote, the intake plenums were roughly $1700 a pair and the engine wiring harness was around $1500. Swirl motor used to be about $400. I just checked all these part prices online just now. Wonder why they dropped so much in the last couple months?

It is easier to do all this with the motor out because it is easier to do all this with the turbo removed and removing that is a real PITA with the motor in.

Luckily in my case, the shiz hit the fan literally 16 hours after I bought it. So the dealer I bought it from is fixing it. I have no idea why they decided to fix it instead of writing it off. I took it to another dealer before I returned it to them to get a second opinion. The initial estimate was $7200 parts and labor! Well over half what I bought the vehicle for. That was back in late May. Here we are over 14 weeks later and I still haven't seen it back. Supposedly it is running now and they are test driving it, but it is still throwing codes. Not surprising for as much as they had to replace and as deep as they went. Still, I'm about to demand they write it off and either find me a 2009 Overland Hemi or part ways.

Anyway, good luck.
__________________
2010 Brilliant Black Crystal Pearl Coat Grand Cherokee S-Limited with various bits 'n pieces... broken in but not even finished!
sickchilly is offline   Reply With Quote
Unread 08-26-2013, 07:22 PM   #4
MEFISHTO
Registered User
2008  
 
Join Date: Aug 2013
Location: lafayette, louisiana
Posts: 5
Quote:
Originally Posted by BAH101 View Post
Did it actually cause damage? You could flood the area with baking power and water, that will neutralize the battery aid, then use an electrical contact cleaner to remove moisture from the connectors.
Not sure. I had the vehicle towed and the dealer said it was toast. I have cleaned, dried and re-attached the harness to PCM in the past and it worked fine. I could not easily pull the right harness off the PCM this time—It seemed stuck in place although it was very slick (raining a great deal). I did not have my tools where I was (400 miles away from home). Of the two harnesses, it's the one on the right as you look down into the engine compartment (one closest to the front (grill) of the vehicle). I'm certainly not paying a great deal of money to do all this work without looking at it myself. Any additional thought is appreciated.
MEFISHTO is offline   Reply With Quote
Unread 08-26-2013, 09:11 PM   #5
suzieque
Registered User
2008 WK 
 
Join Date: Mar 2009
Location: Canada
Posts: 1,809
Some other crd owners have had the battery acid leak on the ecu. I guess the repair depends on how long the battery was leaking that determines the extent of the repair. I would do the suggested repair of washing down with baking soda and carefully remove the connections and see how bad the terminals are before letting the dealer tear into it.

I've owned many vehicles over the years and this is the first one where I've read about acid leaking causing ecu damage. I wonder if there is a batch fo defective batteries or is the alternator over charging...
__________________
2008 WK "S" Limited bright metallic silver exterior, light graystone interior, 5 speed W5J400 transmission, June 18/2008 build, C213RE rear differential with 3.73 axle ratio, C200FE front differential with 3.73 axle ratio, 245/60R18 Goodyear Fortera tires (stock summer tires), NV245 transfer case, GT2056V turbo, 3.0L CRD (OM642.980)
suzieque is offline   Reply With Quote
Unread 09-02-2013, 07:29 PM   #6
jediknight
Registered User
2008 WK 
 
Join Date: Oct 2011
Location: Montreal, Qc
Posts: 419
Quote:
Originally Posted by suzieque
Some other crd owners have had the battery acid leak on the ecu. I guess the repair depends on how long the battery was leaking that determines the extent of the repair. I would do the suggested repair of washing down with baking soda and carefully remove the connections and see how bad the terminals are before letting the dealer tear into it.

I've owned many vehicles over the years and this is the first one where I've read about acid leaking causing ecu damage. I wonder if there is a batch fo defective batteries or is the alternator over charging...
According to dashawk readings... I get 14.3V and up to 14.6 ... Which Ithink is hight ?!

Thoughts ??
__________________
2008 WK CRD Blue, QD II, Startech SD6 mod.
jediknight is offline   Reply With Quote
Unread 09-02-2013, 07:32 PM   #7
sickchilly
Registered User
2010 WK 
 
Join Date: Jan 2008
Location: Seattle, WA
Posts: 207
14.3-14.7 is pretty typical of any 12v alternator powered charging system.
__________________
2010 Brilliant Black Crystal Pearl Coat Grand Cherokee S-Limited with various bits 'n pieces... broken in but not even finished!
sickchilly is offline   Reply With Quote
Unread 09-02-2013, 07:58 PM   #8
jediknight
Registered User
2008 WK 
 
Join Date: Oct 2011
Location: Montreal, Qc
Posts: 419
Quote:
Originally Posted by sickchilly
14.3-14.7 is pretty typical of any 12v alternator powered charging system.
Sweet,
Thanks for confirming.
But I thought we should be looking at the mid 13 range ?
__________________
2008 WK CRD Blue, QD II, Startech SD6 mod.
jediknight is offline   Reply With Quote
Unread 09-02-2013, 08:01 PM   #9
sickchilly
Registered User
2010 WK 
 
Join Date: Jan 2008
Location: Seattle, WA
Posts: 207
Nope, plenty normal. Here's a good read for you:
http://www.landiss.com/battery.htm
__________________
2010 Brilliant Black Crystal Pearl Coat Grand Cherokee S-Limited with various bits 'n pieces... broken in but not even finished!
sickchilly is offline   Reply With Quote
Unread 09-02-2013, 08:20 PM   #10
suzieque
Registered User
2008 WK 
 
Join Date: Mar 2009
Location: Canada
Posts: 1,809
Quote:
Originally Posted by jediknight View Post
According to dashawk readings... I get 14.3V and up to 14.6 ... Which Ithink is hight ?!

Thoughts ??
That's my reading on the dashhawk too.
__________________
2008 WK "S" Limited bright metallic silver exterior, light graystone interior, 5 speed W5J400 transmission, June 18/2008 build, C213RE rear differential with 3.73 axle ratio, C200FE front differential with 3.73 axle ratio, 245/60R18 Goodyear Fortera tires (stock summer tires), NV245 transfer case, GT2056V turbo, 3.0L CRD (OM642.980)
suzieque is offline   Reply With Quote
Unread 07-06-2014, 09:52 PM   #11
nikolab1980
Registered User
2008 WK 
 
Join Date: Dec 2012
Location: DES PLAINES, ILLINOIS
Posts: 3
I got the same problem on my 2008 CRD guys , any help ,how your repair turned out MEFISTO ?
nikolab1980 is offline   Reply With Quote




Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.