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Code P1598, A/C pressure sensor voltage too high?

Tiny
STEPHEN SMITH4
  • MEMBER
  • 2002 JEEP LIBERTY
  • 3.7L
  • V6
  • 2WD
  • AUTOMATIC
  • 119,200 MILES
Code P1598, which part needs to be replaced? Also, a hose under driver side near canister is just attached on one end. Where does the other end go? Pic attached.
Wednesday, October 23rd, 2024 AT 7:40 PM

9 Replies

Tiny
STEPHEN SMITH4
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  • 9 POSTS
Code 0455 shows also; recent new fuel pump.
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Wednesday, October 23rd, 2024 AT 7:43 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,490 POSTS
We only handle one problem per thread sorry. Please start a new questions for other issues.

The P1598 code for a 2002 Jeep Liberty indicates a A/C Pressure Sensor Voltage Out of Range fault.

This is because the AC pressure sensor has gone out or the AC system is having an issue like low on charge, we should replace the sensor first. Here is the location, it should have a pressure valve under the sensor, so you don't have to vacuum down and recharge the system. If the system does need a charge, this video will help:

https://www.youtube.com/watch?v=uZrQCGwXfek

Check out the images (below). Please let us know what happens.
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Thursday, October 24th, 2024 AT 10:23 AM
Tiny
STEPHEN SMITH4
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I've already done the recharge. Is the sensor to replace item 1, 2 or 3 in the diagram? Isn't there a picture of the actual item I need? And why are there 3 names for the same item? Is it a switch, a sensor or transducer?
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Thursday, October 24th, 2024 AT 2:34 PM
Tiny
STEPHEN SMITH4
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Can the pressure sensor be removed without refrig removal?
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Thursday, October 24th, 2024 AT 5:32 PM
Tiny
STEPHEN SMITH4
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  • 9 POSTS
Since the compressor engaged when I added refrig and it is cooling nicely in cabin, could it be possible that just disconnecting battery will remove the check engine code, and it not need a new sensor? Would it be cooling if the pressure sensor were bad?
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Thursday, October 24th, 2024 AT 5:36 PM
Tiny
KEN L
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It is 2/3 I don't know why they have two arrows there it is just one part; you should be able to replace the sensor without discharging the system. Once the sensor is replaced, clear the codes. The problem is the code is for a pressure switch, but there are two, one high pressure and one low pressure and the code does not say which one it is. But since you said the system gets cold, I would think it is the high-pressure switch. Check out the images (below). Please let us know what happens.
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Friday, October 25th, 2024 AT 10:54 AM
Tiny
STEPHEN SMITH4
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How do I know which sensor to replace? Are they the same to purchase?
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Friday, October 25th, 2024 AT 11:41 AM
Tiny
KEN L
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Correct they are the same procedure, I would start with the high side pressure sensor since the low side seems to be working.
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Saturday, October 26th, 2024 AT 9:14 AM
Tiny
KEN L
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Correct they are the same procedure, I would start with the high side pressure sensor since the low sides seems to be working.
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Saturday, October 26th, 2024 AT 9:14 AM

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