Question about Jeep 2003 Liberty Sport 3.7 V6

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2003 jeep liberty p1388

Jeep will not start. Code is p1388 auto shut down relay and the other code coming up is p1491 radiator fan control relay circuit... What does this mean exactly? How/where can I find the problems associated with these codes? Solutions? Thank you!

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Posted on Jan 02, 2017

Brian032472
  • 150 Answers

SOURCE: 2003 Jeep Liberty heater fan problem

It is the blower motor resistor. Look under the passanger side dash and locate the fan housing (looks round and black in color. Then locate the resistor it will be in that housing usually withtwo ten millimeter nuts or two simple screws holding it in. unplug the harness to the resistor and remove the resistor. Part store price is approx. 50.00. Note: on aftermarket (not Jeep) resistor sometimes you have to modify the housing a little to get it in. Hope this helps.

Posted on Feb 01, 2009

  • 1810 Answers

SOURCE: 2000 jeep grand cherokee 4.0 auto getting a code p1388

releys are grounded every where try checking the motor and the body grounds


if all else fails run a new ground 1 to the frame and 1 to the body as likely it has a bad body ground

Posted on Jan 06, 2010

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  • 14036 Answers

SOURCE: will a leak cause the radiator fan relay curcuit to malfunction on a 2003 jeep liberty 3.7

a leak in coolant system will cause air pocket in the coolant system around the engine coolant temperature sensor.coolant sensor is a thermistor in which when hot cool cause it resistance decrease which affect the voltage from sensor to pcm which will cause engine coolant to turn on.if coolant level okay,check coolant fan fuse and relay, if all is good,engine coolant temperature sensor could be bad or have vechicle code scan for pcm problems it control the coolant fan.fill coolant system to correct level make sure engine coolat reservoir is at full cold mark and not empty.fill coolant system check for leaks,refill coolant overflow jug back to full cold mark dont over fill, if coolant overflow stay empty you have leak either its leaking or you have radiator hoses or radiator leaking coolant.when coolant overflow jug run dry it cause air get in coolant system causing overheating problems.

Posted on Sep 03, 2012

perkins48
  • 14337 Answers

SOURCE: 2003 jeep liberty

You may have blown head gasket.

Posted on Oct 31, 2012

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1 Answer

Where is the position of radiator fan relay on jeep liberty 2006


no idea to be honest earlier jeeps had then at the front of the wing down below as i remember ?? newer one would i imagine be in the electrical box under the bonnet near the battery

Dec 02, 2016 | Jeep Cars & Trucks

1 Answer

Code P1388 and P1399


P1388 JEEP - ASD or CNG (compressed Gas) Relay Control Circuit Possible causes - Faulty ASD Relay (most common cause)
- Faulty CNG Relay
- ASD or CNG Relay harness is open or shorted
- ASD or CNG Relay circuit poor electrical connection
- ASD or CNG Relay poor ground or supply voltage condition

P1399 is a related to the P1388 failure.

Jun 27, 2016 | 2000 Jeep Grand Cherokee

1 Answer

What is code 35 and 76 for 1993 grand cherokee


35 is p1491 which is Radiator fan control relay circut (bad relay).... An open or shorted condition detected in the low speed radiator fan relay control circut

I dont have 76 i have 77 is p1683 which is Speed control power relay or s/c 12v driver ckt...... Malfunction detected with power feed to speed control servo solenoids. MAYBE another bad relay

Mar 25, 2013 | Jeep Grand Cherokee Cars & Trucks

1 Answer

Will a leak cause the radiator fan relay curcuit to malfunction on a 2003 jeep liberty 3.7


a leak in coolant system will cause air pocket in the coolant system around the engine coolant temperature sensor.coolant sensor is a thermistor in which when hot cool cause it resistance decrease which affect the voltage from sensor to pcm which will cause engine coolant to turn on.if coolant level okay,check coolant fan fuse and relay, if all is good,engine coolant temperature sensor could be bad or have vechicle code scan for pcm problems it control the coolant fan.fill coolant system to correct level make sure engine coolat reservoir is at full cold mark and not empty.fill coolant system check for leaks,refill coolant overflow jug back to full cold mark dont over fill, if coolant overflow stay empty you have leak either its leaking or you have radiator hoses or radiator leaking coolant.when coolant overflow jug run dry it cause air get in coolant system causing overheating problems.

Jul 25, 2012 | 2003 Jeep Liberty

1 Answer

My 2002 jeep grand cherokee laredo wull not start shutdown 2 days ago checked all fuses but the ecu fuses don't know how to find them


According with your other quesions, the DTC P1491 code is actually radiator fan control relay circuit.
Soft reset if the battery disconnect would have erased the code; the first thing I would replace for that code (fan relay).
Additionally, its possible thta your THEFT system is activated, check owners manual to disarm. Check details here:
- Grand Cherokee fuses

- Diagnostic Trouble Codes

Hope this helps.

Mar 07, 2012 | 2002 Jeep Grand Cherokee

1 Answer

1999 Jeep Cherokee Sport wont shift into overdrive P1491


P1491 - Radiator Fan Control Relay Circuit Open Or Shorted

When monitored: with the ignition key on, battery voltage greater than 10.0 volts and
the pcm requests the radiator fan to be turned on.
Set condition: an open or shorted circuit is detected in the radiator fan relay control
circuit.

Possible causes
radiator fan ctrl rly circuit wire harn intermittent defect
radiator fan ctrl rly circuit wire harn observable defect
radiator fan relay ground circuit open
rad fan relay control circuit open
radiator fan relay control circuit short to ground
rad fan control relay defective
pcm defective

Check ot and keep us updared.

Oct 15, 2011 | 1999 Jeep Cherokee

2 Answers

What is code p1941 for on 2003 jeep liberty


Diagnostic Test Code (DTC) P1941 is NOT a VALID code for a 2003 Jeep Liberty. Are you sure you are reading (and posting) the code correctly?

Also, when asking about DTCs it is really helpful to also mention which engine your vehicle is equipped with.

Aug 27, 2011 | 2003 Jeep Liberty

2 Answers

I was in a minor fender bender ( bumped the car in front of me and did little cosmotic damage.) After that my check engine light came on. The code is P1491 Manufacturer Control Axillary Emissions...


The DTC (Data Trouble Code) P1491 for Chrysler-Jeep is for the Radiator Fan Control Relay Circuit, and the radiator fan control relay is located between the radiator and the AC condenser, and there is the possibility that a collision could have damaged the radiator control relay or the wiring. Here is an image of a chrysler radiator control relay to help assist you.




zaraki_31.jpg

Nov 28, 2010 | 2003 Chrysler Town & Country

2 Answers

P1491 diagnostics code for 2003 Jeep Grand Cherokee



Trouble Code: P1491 You PCM does not sense current to radiator fan when it turns it on. Is the fan coming on or not? Usually not when you have this code. Problem can be with the fuse, relay, wiring or fan itself. First check the fuse. If good, next try swapping the relay with another one in the engine compartment relay box, such as the horn relay.
Let the car warm up and see if the fan will come on. If yes, get a new relay. If not, either use a test light to see if there is voltage at the fan connector when the engine is on and hot, or else test the fan motor by hotwiring it to the battery. If none of this works, please get back to me for how to troubleshoot the wiring.


Radiator Fan Control Relay Circuit Malfunction
Possible Causes:


Radiator fan control relay circuit is open or shorted to ground Radiator fan control relay circuit is open (test power to IGN) Radiator fan control relay is damaged or has failed PCM has failed

Nov 10, 2010 | 2003 Jeep Grand Cherokee

1 Answer

Fault p1491


The code "P1491" on chrysler and jeep products, is the "radiator fan control relay circuit".

I hope this helps you, and I wish you luck on your repair.

Apr 27, 2009 | Dodge Ram 1500 Cars & Trucks

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