U3977 DTC For Mercedes Cls 55

Mercedes Cls 55 Engine Specifications:
Engine Type :Multi-Cylinder Engine
Cylinder Type :V-Type Engine
Engine Air Intake Process :Naturally Aspirated

Your Mercedes Cls 55 engine control system detects a problem, the computer stores the diagnostic trouble code U3977 in its memory. To figure out what is wrong with your vehicle you must first extract the U3977 DTC For Mercedes Cls 55.

A good ground connection is also extremely important. U3977 Mercedes Cls 55 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).

U3977 Mercedes Cls 55 DTC Meaning

U Network Code - Problem is climate control system, lighting, airbags, etc.
3 SAE - Generic
9 Transmission
7 Exhaust Gas Recirculation System Valve 1
7 Cruise Control System - Vehicle Accel Too High

The original multi-displacement system turned off opposite pairs of cylinders, allowing the engine to have three different configurations and displacements. U3977 Mercedes Cls 55 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.

U3976 DTC (Previous DTC Code) ( Next DTC Code ) U3978 DTC
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