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P0551 power steering pressure sensor circuit range performance, this sensor idles up the RPM as steering wheel is turn in order to maintain proper idle and to prevent vehicle from stalling
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https://www.youtube.com/watch?v=ciCPQ0kVAQY
Dec 21, 2012 - Uploaded by VeeTheAmazingGreek
... had to change out the cam position sensor on my 2001 Dodge Neon. ... 1997 Dodge Neon no start, crank sensor problems - Duration: 26:53.
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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
P0551 is for the power steering pressure switch. This is a switch that is threaded into the back of the steering rack. It's job is to tell the engine controller when pressure increases in the system from turning the wheel at low speeds, and the engine controller can increase the idle speed slightly to compensate. It's not incommon for these switches to fail.
You'll have to get at it from underneath the car. Look on the back of the steering rack and find the only electrical part on it, that's the switch you are after. Unplug it and check for signs of fluid leakage into the connector. Very often when they fail they will leak into the connector. This code setting is almost always the switch, but if you find fluid in the connector it's bad for sure.
This switch probably is a dealer item, but there should still be plenty of them around. Did you give Auto Zone a try? Or visit Rockauto.com, with this sample IMAGE LINK...
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