Question about 2006 Dodge Ram 2500

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2006 dodge 2500 code P0533 How do i fix - 2006 Dodge Ram 2500

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P0533 A/C Pressure Sensor High.

It could be low on refrigerant, or it could be a bad sensor. Back-probe the pressure sensor connector (on the discharge line, near the compressor - it's a 4-way connector) on the dark blue wire with the engine running and the A/C turned to max. If you get no volts, or 5 volts, the sensor is bad. 4.5 volts indicates a properly-operating system, while less than 4.5 indicates low pressure, and anything above indicates high pressure. If low or high pressure is suspected, verify with a set of refrigerant gauges.

If warranted, the sensor can just unscrew. You won't lose refrigerant - there's a valve built in to the line to prevent that. Make sure to use a new O-ring and lube it with the proper oil if you do change the sensor.

Posted on Sep 09, 2010

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  • Dodge Master
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Check your sensors. my refrigerant sensor went out and i got the low freon message too. also would not allow the compressor to cut on. check all the sensors first.

I am not sure what sensor that P0533 is referring to. I am also surprised that it is a P (PCM) code and not a B (body) code.

P0533 - Air Conditioning (A/C) Refrigerant Pressure Sensor Circuit High Voltage

Might be the same sensor as mine? i too would get "Low refrigerant - A/C off" when i was full pull it out and put a jumper into it. if the code changes or a new code pops up it might be your issue.

Check this out might help:
http://www.ls2.com/boggs/dtcs/DTC%20P0530.htm

Hope helps.

Posted on Sep 09, 2010

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SOURCE: What causes P0533 & P0532 trouble codes on

P0533 A/C Pressure Sensor High.

It could be low on refrigerant, or it could be a bad sensor. Back-probe the pressure sensor connector (on the discharge line, near the compressor - it's a 4-way connector) on the dark blue wire with the engine running and the A/C turned to max. If you get no volts, or 5 volts, the sensor is bad. 4.5 volts indicates a properly-operating system, while less than 4.5 indicates low pressure, and anything above indicates high pressure. If low or high pressure is suspected, verify with a set of refrigerant gauges.

If warranted, the sensor can just unscrew. You won't lose refrigerant - there's a valve built in to the line to prevent that. Make sure to use a new O-ring and lube it with the proper oil if you do change the sensor.
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Posted on Sep 09, 2010

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It could be low on refrigerant, or it could be a bad sensor. Back-probe the pressure sensor connector (on the discharge line, near the compressor - it's a 4-way connector) on the dark blue wire with the engine running and the A/C turned to max. If you get no volts, or 5 volts, the sensor is bad. 4.5 volts indicates a properly-operating system, while less than 4.5 indicates low pressure, and anything above indicates high pressure. If low or high pressure is suspected, verify with a set of refrigerant gauges.

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