U257A Pontiac Grande Parisienne DTC Code

Pontiac Grande Parisienne Engine Specifications:

Engine Type :	Multi-Cylinder Engine
Cylinder Type :	V-Type Engine
Engine Air Intake Process :	Supercharged Engine

Your Pontiac Grande Parisienne engine control system detects a problem, the computer stores the diagnostic trouble code U257A in its memory. To figure out what is wrong with your vehicle you must first extract the U257A DTC For Pontiac Grande Parisienne.

A good ground connection is also extremely important. U257A Pontiac Grande Parisienne engine problem because the presence of voltage at the panel harness won't make the panel work if there is a bad ground connection. Since the instrument cluster is mounted in a plastic dash, a separate ground wire or ground circuit through the wiring harness is usually needed to complete the power circuit. Refer again to the wiring diagram to find the ground path, and then check it with your ohmmeter. Do not use a self-powered test light because it cannot measure resistance (any resistance will lower circuit voltage).

U257A Pontiac Grande Parisienne DTC Meaning

U	Network Code - Problem is climate control system, lighting, airbags, etc.
2	MFG - Manufacturer Specific
5	Auxiliary Emission Controls
7	Exhaust Gas Recirculation System Valve 1
A	TFP Valve Position Switch-Drive Without Drive Ratio

The original multi-displacement system turned off opposite pairs of cylinders, allowing the engine to have three different configurations and displacements. U257A Pontiac Grande Parisienne code had an elaborate diagnostics procedure, including showing engine trouble codes on the air conditionning display. However, the system was troublesome, misunderstood by customers, and a rash of unpredictable failures led to the technology being quickly retired.