Question about Pioneer DEH-P4000UB CD Player

3 Answers

Pioneer DEH-P4000UB not turning off.

I own a Chevrolet Cobalt 07 with a newly installed deck, I can't seem to turn it off without pulling the faceplate off. I've tried holding the Source button but the console still wouldn't turn off.

Posted by on

  • 1 more comment 
  • Anonymous Feb 18, 2009

    the fact that the same switch does other functions would suggest it is not the switch

  • Anonymous Mar 21, 2009

    yo tambien tengo el mismo problema no

    puedo apagarlo sin sacarle el frontal al equipo

  • Anonymous May 12, 2009

    holding the source button didn't work for me either


3 Answers

  • Level 1:

    An expert who has achieved level 1.


    An expert that has over 10 points.


    An expert whose answer got voted for 2 times.

  • Contributor
  • 1 Answer

I thought the same thing but what is happening is when it turns off it is in demo mode and it looks like it's not off. When you hold in src it changes to something that says "USB/IPOD.. " scrolling. Press display and it turns demo mode off. Then it will turn on and off properly.

Posted on Jun 19, 2009

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.


    An expert whose answer got voted for 20 times.

    New Friend:

    An expert that has 1 follower.

  • Expert
  • 111 Answers

I think the minoerpad or the microswich or touch button inside the source switch is dosnot make connection please remoove the cover cairfully and check the switch conditions with ohm scale should be 0 ohm or close to zero while pressing it.infinity must show when relese it very cairfully.

Posted on Jan 09, 2009

  • Level 1:

    An expert who has achieved level 1.


    An expert whose answer got voted for 2 times.

  • Contributor
  • 3 Answers

You have to have a special wiring harness the only power source coming from the OEM wiring harness is a constant 12 volt therefore keeping your deck on at all times you have to buy an after market wiring harness here are the models for a few there a little pricey but if you want it to work properly and all your door chimes and such. Your factory radio has a lan running threw it witch controlls your door chimes and other safety features first you have to find out if you have an amplified system or a pioneer system or a bose system then i will be able to give you the wireing harness model number for your car

Posted on May 15, 2009

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

I had to change my battery now my Pioneer DEH- P4000UB won't even turn on! I am so confused! I had it installed by Best Buy, I have no idea what to do! Please help! Thanks :-)

Double check the connections from the battery. There might be some loose wire. Did you change any connections at the back of the Radio?

Apr 09, 2011 | Pioneer DEH-P4000UB CD Player

1 Answer

I need help

considering that all the wires are hooked up right ,the HU is perfectly ok ,check whether the "Fader"is selected to the front speakers .

May 31, 2010 | Pioneer DEH-P4000UB CD Player

1 Answer

How do i set the clock on the pioneer deh-p4200ub cd player - United States -
It's all in manual above.

Apr 08, 2010 | Pioneer DEH-P4000UB CD Player

2 Answers

Just wondering if Pioneer DEH-P4000UB cd player

no it does not have built in bluetooth but you can get a optional bluetooth kit Pioneer CD-BTB200

Jan 02, 2010 | Pioneer DEH-P8500MP CD Player

1 Answer

Need wiring diagram for pioneer deh-p4000ub

Here is the PDF file for your radio. On page 63 is the start of the wiring diagram. I hope this helps. Please Rate this solution

May 20, 2009 | Pioneer DEH-P4000UB CD Player

1 Answer

No sound from speakers

did you check to make sure your vehicle didnt come with a factory amp, if it has one is it turning on? or did you remember to disconnect the negative battery cable while installing your radio, i know thats a dumb question, once i was installing a pioneer a barely crossed a couple wires and fried the radio, the radio itself worked fine and all the features etc, but it never did play sound again. i always disconnect the power now!!

Dec 26, 2008 | Pioneer DEH-P4000UB CD Player

2 Answers


push the vol knob then it will say "function" or if you turn the vol knob "audio" you will want to choose "audio" then you will spin the knob till you see eq settings 1 choose it then from there you will see L...M...H these are what you are looking for

Sep 28, 2008 | Pioneer DEH-P4000UB CD Player

1 Answer

Help please

to set the clock turn off the unit and then hold the multi control thing down and the clock thing will come up.

Sep 02, 2008 | Pioneer DEH-P4000UB CD Player

Not finding what you are looking for?
Pioneer DEH-P4000UB CD Player Logo

980 people viewed this question

Ask a Question

Usually answered in minutes!

Top Pioneer Car Audio & Video Experts

Michael Kovalik III
Michael Kovalik III

Level 2 Expert

117 Answers

The Knight
The Knight

Level 3 Expert

72670 Answers


Level 3 Expert

70387 Answers

Are you a Pioneer Car Audio and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides