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Battery Replacement
 
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Pelican Technical Article:

Battery Replacement

Jared Fenton

Time:

1 hour1 hr

Tab:

$200

Talent:

***

Tools:

10mm XZN driver, T25 Torx driver, 10mm socket, screwdriver

Applicable Models:

Porsche 955 Cayenne (2004-08)
Porsche 955 Cayenne S (2003-08)
Porsche 955 Cayenne Turbo (2003-08)

Parts Required:

New battery

Hot Tip:

Do a voltage test before replacing battery

Performance Gain:

Better working electrical system

Complementary Modification:

Clean carpet area.

Batteries wear out. It is a simple fact of life. The battery is perhaps the most important electrical component on the car, and due to its design and nature, is also one of the most troublesome.  Often times, a puzzling electrical problem can be solved by doing something as simple as cleaning a battery terminal. On the Porsche Cayenne, a dying battery can cause a multitude of electrical glitches, Check Engine Lights (CELs) and slow starter operation. I've also noticed that a persistent PSM Failure message on the dash can also be a symptom of a dying battery.

Due to the design of the car, the best way to check battery condition is to use the factory Porsche diagnostic computer or a good aftermarket software package. Using a laptop, you can monitor the battery voltage as well as current draw and alternator output. Chances are that the vehicle likely has diagnostic trouble codes stored indicating an erratic voltage condition.

A few words on safety. Always disconnect the negative terminal first. If you disconnect the positive lead first, there is a chance that your tool may touch the metal chassis. This will result in a short circuit which would be can be dangerous to both the car and you.

Be sure to purchase a battery that has the same group number and CCA rating (Cold Cranking Amps). Check the freshness date on the battery that you are purchasing and avoid any batteries that are more than six months old. Note that after you disconnect your battery, the DME computer will lose some of its history memory used for adapting the fuel injection system. As a result, the idle may fluctuate, and the fuel injection mixture may be slightly off as the car relearns its settings. This may also trigger a steering angle sensor error. Simply drive the car straight ahead for 10-20 feet and the error code will go away.

Begin by moving the left seat fully forward.
Figure 1

Begin by moving the left seat fully forward. You'll want to access the rear of the seat. Remove the trim plugs off the seat rail covers (green arrow).

Now pull the rear covers off the track.
Figure 2

Now pull the rear covers off the track. It may take a little effort to free them up.

This picture shows the clip on each seat rail that holds the covers in place (green arrow).
Figure 3

This picture shows the clip on each seat rail that holds the covers in place (green arrow).

You'll want to fit the clips over the plastic tab on the inside of each plastic cover (green arrow) when you re-install them on the seat rail.
Figure 4

You'll want to fit the clips over the plastic tab on the inside of each plastic cover (green arrow) when you re-install them on the seat rail.

Now pull the carpet up under the seat.
Figure 5

Now pull the carpet up under the seat. You'll want to access the rear clips holding the battery compartment cover on (green arrows). Flip the clamps up and off the cover.

Move back to the front of the seat and locate the slit in the carpet along the front outer edge of the seat.
Figure 6

Move back to the front of the seat and locate the slit in the carpet along the front outer edge of the seat. You'll want to carefully pry the flap of carpet out from under the front seat cover. Note that there are two plastic covers that fit over each slit in the carpet. Pull them up and off to remove them. Our project car seemed to be missing them when we replaced the battery.

Loosen and remove the 10mm XZN bolt holding the left seat frame to the chassis (green arrow).
Figure 7

Loosen and remove the 10mm XZN bolt holding the left seat frame to the chassis (green arrow).

Now loosen and remove the 10mm XZN bolt holding the right seat frame to the chassis (green arrow).
Figure 8

Now loosen and remove the 10mm XZN bolt holding the right seat frame to the chassis (green arrow).

Tilt the whole seat assembly backward.
Figure 9

Tilt the whole seat assembly backward. You'll want to use the power seat switches to move the seat back enough to clear the steering wheel, and then fully forward and up to allow the seat to fold back as much as possible. If your battery is completely dead, you'll need to connect an auxiliary 12 volt power source to the jumpstart terminal and ground in the engine compartment to provide power to the switches.

Loosen and remove the T25 Torx screw holding the rear foot vent to the battery compartment cover (green arrow).
Figure 10

Loosen and remove the T25 Torx screw holding the rear foot vent to the battery compartment cover (green arrow). Then pull the wiring harness grommet out of the hole on the relay panel (yellow arrow).

Flip up and remove the two metal clamps at the front of the battery compartment cover.
Figure 11

Flip up and remove the two metal clamps at the front of the battery compartment cover. Now remove the cover from the car.

Shown here is the battery once the cover is removed.
Figure 12

Shown here is the battery once the cover is removed.

Loosen the 10mm nut (green arrow) clamping the negative terminal to the battery and pull the cable off.
Figure 13

Loosen the 10mm nut (green arrow) clamping the negative terminal to the battery and pull the cable off. Always remove the negative cable first. I like to put a small bag over the end of the terminal to prevent it from making contact when installing the new battery. Now remove the battery vent by pulling it out of the holes in the battery and the case (blue arrows). Lastly, remove the 10mm bolt holding the guide piece in place (yellow arrow).

Pull the guide piece (green arrow) up and out of the battery compartment.
Figure 14

Pull the guide piece (green arrow) up and out of the battery compartment.

Now loosen the 10mm nut (green arrow) clamping the positive terminal to the battery and pull the cable off.
Figure 15

Now loosen the 10mm nut (green arrow) clamping the positive terminal to the battery and pull the cable off.

Now loosen and remove the 10mm clamping bolt holding the battery to the bottom of the compartment (green arrow).
Figure 16

Now loosen and remove the 10mm clamping bolt holding the battery to the bottom of the compartment (green arrow). Once loose, pull the clamp up and out of the compartment.

You'll now have to push the battery slightly to the rear to clear the mounting tab at the bottom of the compartment (green arrow).
Figure 17

You'll now have to push the battery slightly to the rear to clear the mounting tab at the bottom of the compartment (green arrow). At this point, you can lift the battery up and out of the car. Keep in mind that the battery is very heavy, so use caution when removing it. When fitting the new battery, make sure that the edge fits back into mounting tab.

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Comments and Suggestions:
York Comments: replaced battery, now headlight default code on dash
November 5, 2016
  Followup from the Pelican Staff: Are the headlights working? - Nick at Pelican Parts  
Malaka Comments: Changed the battery in a cayenne 2005 now won't start. Just cranks but won't fire up and no spark
Any ideas
July 9, 2016
  Followup from the Pelican Staff: You may have tripped the theft system. I would start by checking the DME for fault codes. If the system is not working properly, a fault code will be set. This will be your best bet when diagnosing.
- Nick at Pelican Parts
 
Appllo Comments: My porsche cayenne s usually starts by itself in the morning, now if the engine is turned off, it will not start again until allowed to cool down for few hours again. But it will start if jumped start with a second battery. What seems to be the fault
May 20, 2016
  Followup from the Pelican Staff: Sounds like either a faulty battery or battery cable. - Nick at Pelican Parts  
GEO Comments: Had the car running for thirty minutes with lights on radio on door open and ac on and the volts were still 13.6-13.7 code didn't return in the two hours I worked on it
April 7, 2016
  Followup from the Pelican Staff: Must be OK right now. Thanks for the note. - Nick at Pelican Parts  
GEO Comments: My 2009 Cayenne Turbo S came up with the alternator/battery red window on the way home. I let it sit overnight checked the battery it is at 12.5-12.7 and when started car it goes to 13.6 with everything on, can't figure out whether the battery is bad 18 months old or alternator is going? Any thoughts?
April 7, 2016
  Followup from the Pelican Staff: Likely alternator. You will have to check charging system voltage and current under a load to determine the cause. - Nick at Pelican Parts  
Chuck Comments: While this may not be necessary, I connected a portable 12-volt jump start battery to the jump start posts in the engine compartment, left side, in order to maintain all of the computer data/settings during the battery change out. I used a rubber glove to prevent the positive cable from acidentally touching ground.
February 18, 2016
  Followup from the Pelican Staff: Thanks for the additional info. We appreciate it.
- Nick at Pelican Parts
 
i need simple help Comments: Whats the name of all the tools needed for these steps beside the flat head screw driver ????
January 13, 2016
  Followup from the Pelican Staff: 10mm socket and T25 Torx driver. - Nick at Pelican Parts  
OvalPiston Comments: I just changed my battery in my 955 TTS with these GREAT instructions. A few things I found out that helped me: The 1st step, just take a flat-blade screwdriver underneath the trim plugs at the rear and pry it out of its hole it rests in.

The 2nd step in this article about pulling the rear covers off, they came off surprisingly easy. I pried them away from the inner rails first, then I grabbed the plastic that faces the inner of the seat, and pulled hard while wiggling the back piece and they came right off.

In step 6 and 7, my CTTS had the plastic covers that covered the bolts for the seat on both sides. the driver's side there are two metal tension plugs, and one on the right. When I re-installed them, I pried the front bottom seat carpet out to get the passenger-facing plate in.

Great article!
December 7, 2015
  Followup from the Pelican Staff: Thanks for the additional info and feedback. We appreciate it.
- Nick at Pelican Parts
 
Vasco Comments: Replaced battery in 2006 Cayenne Turbo S. Took me about 35 minutes. Thanks for ur step by step instructions.
November 19, 2015
  Followup from the Pelican Staff: Thanks for the additional info and feedback. We appreciate it.
- Nick at Pelican Parts
 
Vasco Comments: where can u buy a T25 Torx Driver
November 12, 2015
  Followup from the Pelican Staff: From pelican Parts. Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts  
Jim NM Comments: Yesterday, my '10 Base Cayeene would not start. Having anticipated this issue by previously printing the Pelican battery replacement instructions, and even practicing getting to the battery, the process was nearly painless. That is except for the removal and replacement of the plastic trim covers, which are friction fit/clamped, and thus are difficult to replace. That solution is just to take your time on the trim replacement. THANKS Pelican Parts for the info --- a significant amount of savings! AND yes, the Operators Manual is full of the instruction of ...... ' and immediately have the vehicle returned to the dealer for the work '. On one hand, the battery location is kinda neat, however, a real inconvenient location for the 2 hours of "tight quarter" work.
October 20, 2015
  Followup from the Pelican Staff: Thanks for sharing your installation process and experience. These type of comments add so much to the Pelican tech community.
- Nick at Pelican Parts
 
jlittle Comments: I took my truck to the dealership, and was told I do not have the correct AGM battery. That I need a non-AGM battery to probably start my truck..2005 Porsche Cayenne. Is this true?
August 25, 2015
  Followup from the Pelican Staff: It can be. You will want to use the correct part number battery. the electrical system is designed to work with it. - Nick at Pelican Parts  
stuntman29 Comments: The bit needed to unscrew the seat bolts I bought at my local Auto zone was a pack of, BRAND "OEM" 12 point bit set. 10mm 12 point bit was the right one.
May 18, 2015
  Followup from the Pelican Staff: Excellent! Thanks for the added information. - Casey at Pelican Parts  
TB Comments: This was incredibly helpful-thank you so much for providing such a useful, step-by-step process!
May 18, 2015
  Followup from the Pelican Staff: You are welcome! Thanks for the feedback. - Casey at Pelican Parts  
Pat Comments: Hi Nick I need to know if the same application will do for a 2011 porsche cayenne battery replacement.
February 23, 2015
  Followup from the Pelican Staff: Does not look like it:

Applicable Models:
Cayenne (2003-08)
Cayenne S (2003-08)
Cayenne Turbo (2003-08) - Nick at Pelican Parts
 
Patrick Maya's Comments: Hi nick will it be the same application for a 2011 cayenne s replacement battery. Please provide me with some inputs.
February 23, 2015
  Followup from the Pelican Staff: Does not look like it:

Applicable Models:
Cayenne (2003-08)
Cayenne S (2003-08)
Cayenne Turbo (2003-08)
I would grab a repair manual. It will have the procedure, special tools and torque specs.

Give our parts specialists a call at 1-888-280-7799.
- Nick at Pelican Parts
 
David S Comments: Where can I get a battery to do this repair? I noticed Pelican doesn't ship batteries. I have a 2004 Porsche Cayenne S. What kind of battery would you recommend? Thanks, David
February 16, 2015
  Followup from the Pelican Staff: Try Interstate, Bosch or Porsche factory. - Nick at Pelican Parts  
Matt Comments: @ Kenny, which model cayenne do you have? And does it have a nav system? Interstate website lists the MTP-94R/H7 for my 2009 cayenne V6 no nav. I installed this last night and so far so good. I've done a few starts running around town. I will update y'all if my luck changes. The steps listed above made this diy pretty straightforward. I would rate it a 2 out of 10 on difficulty, took a couple hours but I was taking my time. Don't even attempt without a 10mm xzn driver for the seat bolts and the T25 driver. Also, swap the battery quickly when you start unhooking it so you don't lose all your computer settings. Idle will be slightly rough for a few minutes while the computer relearns it's correct settings. Leave your key in for 30 seconds before trying to start it, car did not read my key on the first try but after putting it in a second time it read my key and unlocked the steering column. I had a light on the dash initially but after 200 feet of driving it turned off. Car is back to normal now, I will repost if something changes. Thanks for another great tech article Pelican.
December 31, 2014
  Followup from the Pelican Staff: Thanks for sharing your installation process and experience. These type of comments add so much to the Pelican tech community.
- Nick at Pelican Parts
 
Kenny @ Mars Motoring Comments: Some of you may consider Interstate battery, and I would like to share the fact that the battery listed in their web site, MTP-49/H8, is indeed incorrect. It only has 730cca and will have trouble starting car especially under load and in cold weather.

The correct one to use is MT5-49/H8, a AGM version with 900cca and 1000ca.
December 29, 2014
  Followup from the Pelican Staff: Thanks for the additional info and feedback. We appreciate it.
- Nick at Pelican Parts
 
Zachariah Comments: Excellent DIY article. Did my 2005 Cayenne S in under 20min. The hardest part was wrestling that 50+pound battery in/out. Don't be shocked when the car cannot restart after installation. The Cayenne needs 5min to "re-learn" everything before driving off. Do not give-up %650/installed at the Porsche $tealer...I installed a new DEKA AGM 900CCA battery for well under $160!
December 12, 2014
  Followup from the Pelican Staff: Thanks for the additional info and feedback. We appreciate it.
- Nick at Pelican Parts
 
Klaus Comments: Just replaced the battery on my 2008 Porsche Cayenne Turbo - it is the first battery replacement on this car since it was put in service back in June 2008.

Followed these instructions and they are great! Every step is accurately described and accompanied by pictures which made the whole process easy. Took me 85 minutes from start to finish. Was quoted $650 by dealer parts and labor - now did it all for $149!!! Thanks guys - great job on the instructions.
September 12, 2014
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help.
- Nick at Pelican Parts
 
bryan Comments: This was a great explanation of how to replace the battery. I second that the manual that came with the car is horrible, actually it doesn't even apply to the seat in the car and appears to be written for a completely different vehicle!
August 5, 2014
  Followup from the Pelican Staff: Thanks for the additional info and feedback. We appreciate it.
- Nick at Pelican Parts
 
JP Comments: Without this step by step I"d still be scratching my head to get the seat to tip back far enough. The manual with the car sucks. Thanks for making the effort to help out shade tree mechanics like myself.
July 20, 2014
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help.
- Nick at Pelican Parts
 

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