Question about Jeep Grand Cherokee

1 Answer

95 Jeep Grand Cherokee 5.2 V8 Check engine light came on last week. Found that number six fuel injector not working. Noticed that harness to injector had been almost cut thru due to heater hose rubbing on it. Repaired the harness, but still no voltage coming thru harness to injector number six. I tested injector and it is working. I am thinking pcm was damaged when harness was cut thru. Please help. Code number 27 comes from computor.

Posted by on

  • pianosdude Jun 17, 2009

    Hello and thank you for the advice. I checked all eight injectors by unplugging one at a time. All function except number six. Used continuity tester to track wires from injector to pcm. All good. Voltage at other seven connectors.

    I have a factory installed alarm, so I am concerned about what you said about used computors. Does this apply to computors that have been rebuilt and updated?





1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Master
  • 10,515 Answers


Code 27 indicates a badinjector(s) OR a bad computer if you are VERY technicaly involved youneed to get a service manual and follow the code to its end if not thenyou need a pro to take over. first you need to identify whichcylinder(s) are misfiring the SAFEST way for a novice is to disconnecteach injector wire 1 at a time with the engine running and whichevercylinder(s) don't cause the rpm's to drop are misfiring cylinders thenyou need a "noid" light for your particular injector connector, thereare several types and are available at most larger autoparts stores youSHOULD have a bosch style connector, install the noid light in the harness at the injectorend and watch the light it should blink rapidly if it dosen't blinkthen you need to check the wiring with an ohm meter (digital only) for shorts and/or open circuits from the engine computer to the injector(s) if they are ok then the engine computer is at fault do not use a used computeras many jeeps had factory alarms and that once activated is stored inthe engine computer and CANNOT be deactivated. if you are notcomfortable working around the computer and cannot get a service manualthen goto a pro it will cost you less in the long run.

If you wish, you can buy a cost effective repair manual :-

Thanks for using "Fixya".

Posted on Jun 17, 2009

  • taran_2005
    taran_2005 Jun 17, 2009


    Code 27 is more difficult
    it means the computer isn't seeing the injectors pulse this is USUALLY
    a bad computer but connectors on any injectors that are marginal OR a
    bad injector (your guess is as good as any as this was a VERY simple
    computer and only looks at all the injectors at the same time) this
    code may be best left to a pro (a good jeep tech).
    Any further help, let me know.




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

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this 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.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

I am doing a motor swap in my 95 jeep grand Cherokee, I am puttin in a 5.2 liter v8 which is what is stock. My question is on my original motor I have one fuel line coming from the rail and on the 94 motor...

to clarify, if i understand correctly your old engine has one fuel line and the replacement has a feed and return line on the fuel rail. if this is the case the usual thing to do would be to use the fuel rail and injectors from the old engine"stock engine pulled from your vehicle" Its not unusal in an engine swap to need to re-use the origianal sensors, harness and fuel system due to design changes from year to year. in your case, the engine going in is a year older than the one being pulled so i would definately use all componets off of the 95 placed on the 94 replacement engine make sure to use the factory harness for the 95 as well. please forgive spelling and grammer long day at the office Good luck let me know if you need any further help!

Apr 06, 2012 | 1995 Jeep Grand Cherokee

1 Answer

Cant find engine number on 2001 v8 jeep grand cherokee

On V-8 engines, the serial number is stamped on a machined pad on the left front corner of the cylinder block.

On the six cylinder engine, build date information can be found stamped on a machined pad located on the right side of the cylinder block between the No. 2 and 3 cylinders.

Jul 28, 2011 | 2001 Jeep Grand Cherokee

1 Answer

I have been getting a trouble code po205 on my jeep i have replaced the injector (with an oe injector). The same problem arose two weeks later. What could be deal with my jeep?

Check cylinder # 5 injector elec. wire, with test light, and engine running, disconnect injector # 5 harness, one wire should alway have voltage, now reverse test light at battery, now you will be checking ground, probe other wire, ground should flash, if you don't have none,or just one, look for a break in the wiring harness.

Jul 04, 2010 | 2003 Jeep Grand Cherokee

1 Answer

Very rough idle on 2002 Jeep Grand Cherokee Limited Edition V8

If you haven't changed the plugs or had the fuel system cleaned, now would be a good time to do it. The number 1 culprit for rough idles is dirty injectors or plugs. You can try an injector cleaner in a can (or bottle) for under $10 and see if it helps, and then work from there. If there isn't any improvement then if you are able to, check the plugs for any gunky buildup and if you find a bad plug, make sure you replace them all (or have them replaced) at the same time.

Aug 03, 2009 | 1996 Jeep Grand Cherokee

1 Answer

Sporatic hesitation

check the retaining pins for injector plugs on harness they may be worn or missing

Jul 29, 2009 | 1996 Jeep Grand Cherokee

1 Answer

95 Jeep Grand Cherokee 5.2 Check engine came on last week, began running rough. Found number six fuel injector wire was partially cut thru because of heater hose rubbing on it. Repaired no. six injector...

You need to begin tracing harness wire that has no power, back to the computer. If you can locate the wire at the computer, first check it there. If no signal from the computer at the pin, then change computer.

Jun 17, 2009 | 1999 Jeep Grand Cherokee

1 Answer

Knob on air conditioner not working right and cruise control stopped working at same time

It is a vacuum leak under the hood. If it is a six cylinder, look on the driver side of the intake manifold for a L shaped fitting that usually pops off. If it is a V8 the leak may be near the battery.

May 26, 2009 | 1999 Jeep Grand Cherokee

1 Answer

2001 jeep Grand Cherokee fuel injectors

check the injectors on that bank for pulses.. a regular 12v text light will do it should flash when cranking... its very possible that the crank sensor or camshaft sensor on the replacement engine is bad and giving you all the problems you have now.. are you using the original injectors? if you have injector pulses then check the coil for pulses the same way.. btw make sure you have 12v to them even before cranking engine could be a bad asd relay..wet plugs on one bank would also indicate a possible leaking injector and basicly draing the fuel starving the oposite bank for fuel.. to verify that the rail must be lifted by removing all 4 bolts make sure the clips hold the injectors firmly and turn the key to run but dont crank it then look for fuel leakin from bottom of injector(s) any drips is a bad injector..

Jan 28, 2009 | 2001 Jeep Grand Cherokee

1 Answer

2004 Jeep G Cherokee diagnostic code open injector

It could be a faulty pcm or wiring as you stated in you post. the pcm pulses a ground to the injector circuit allowing the solenoid in the injector to activate momentarily are inject fuel into the intake. if you give me the engine size. V8 4.7L or strait 6 cylinder 4.0L and i will post the proper wiring diagram for the fuel injectors to help you out with your battle

Jan 09, 2009 | 2004 Jeep Grand Cherokee

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

104 people viewed this question

Ask a Question

Usually answered in minutes!

Top Jeep Experts


Level 3 Expert

81285 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

Kevin Daniels

Level 3 Expert

1455 Answers

Are you a Jeep Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides