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Code p0551 is for the power steering. is the issue with the steering?
the compressors fail on these models, i would get it into an aircon specialsit or the agents.
Here is the description for the code. You need to check the sensor and the wiring back to the computer.
P0551 DODGE Description
Power steering pressure (PSP) sensor is installed to the power
steering high-pressure tube and detects a power steering load. This
sensor is a potentiometer which transforms the power steering load into
output voltage, and emits the voltage signal to the Powertrain Control
Module (PCM). The PCM
controls the electric throttle control actuator and adjusts the
throttle valve opening angle to increase the engine speed and adjusts
the idle speed for the increased load. Read more: http://engine-codes.com/p0551_dodge.html#ixzz21xtT1DTz
Error code P0551 which reads in the Chrysler PT Cruiser computer codes as "The power steering switch may not be working".For this error the switch has to be replaced. The power steeringpressureswitchis on the steering rack. It senses the pressure in the
system, and when the pressure goes high from turning the steering wheel, if you
are at idle it will raise the idle speed slightly. you may not even notice that
it's not doing it anymore. This isn't an uncommon problem on these cars. It's
very likely that you'll need a new switch. It threads into the back of the
steering rack and has a two wire electrical connector.-------------This will help.Thanks.Helpmech.
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