Re: 2005 sts code states service suspension and service...
So does my 2006 STS....! On the Tire monitoring subject.... The next time it tells you to service it, scroll through and see if the system is reporting a tire pressure for each tire, if it is, and there is not all dashes for one of the tires, there is nothing to worry about. Note.... aftermarket rims, tire sealants and tire rotations done without "relearning wheel sensor positions", (page 5-67 in your manual), can cause a "DTC" (Diagnostic Trouble Code) to display and tell you to service it. On the stability system, I have to do some more digging....
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You need the trouble code (DTC) to troubleshoot exactly what's wrong - you can use a code reader to see this. If you have the road sensing suspension option, it's usually one of the four wheel vertical motion sensors, and if that's the problem, GM sells a replacement sensor kit that you should be able to install.
code p2123 refers to accelerator pedal position sensor (APP) /switch D --high input===causes -- wiring short to positive--APP sensor/switch
Also --throttle position sensor/ switch (TP) D high input===causes wiring short to positive ---TP sensor switch
Check the APP/TP sensor/switch as the problem may be there.
most likely cause is that the actuator ( sensor) for the air ride shocks is telling the car that the suspension is wrong fo rhigher speeds. the "fix" would be to return to the original air-ride shocks and correct any other modifications made. with computerized systems you cannot just make arbitrary changes without re-programing the computer to accept them( a very costly "if available" option
Hi Jose: The first place to start is to have Ride Control Module scanned for trouble codes, this requires a high end scan tool. Most common problem is the air compressor in the rear or a height sensor. Here is how the system works.
Automatic Level Control Description and Operation The RTD system is bi-state real time damping system. The Suspension Control module controls the suspension damper solenoids and suspension position sensors, along with parts of the automatic level control (ALC) system and electronic variable orifice (EVO) power steering system.
The Automatic Level Control system consists of the following: • Suspension Control Module • Compressor/Leveling Module - Air Pressure Sensor - Exhaust Solenoid • Compressor Motor Relay
The objective of the Automatic Level Control System is to provide constant ride height at all load conditions. The Suspension Control module monitors body-to-wheel height, and vehicle speed.
The Suspension Control module will use the rear body-to-wheel displacements and vehicle speed inputs to keep the rear trim height of the vehicle at its desired level.
The electronic suspension control (ESC) system is bi-state real time damping system. The ESC module controls the suspension damper solenoids and suspension position sensors, along with parts of the automatic level control (ALC) system, if 1500 series.
The ESC system consists of the following: • The ESC module • The compressor/leveling module, if 1500 series - The air pressure sensor, if 1500 series - The exhaust solenoid, if 1500 series • The compressor motor relay, if 1500 series • The steering handwheel speed/position sensor • The suspension damper solenoids • The suspension position sensors
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