Iveco Eurocargo: Achieving 13.6 Bar Pressure in Circuits I & II - Causes & Solutions

The discussion addresses an issue with an Iveco Eurocargo truck where the air pressure in circuits I and II reaches an abnormally high 13.6 bar, triggering a "too high BC pressure" error and confirmed by pressure gauge readings. The vehicle has had the dryer base and the four-circuit valve replaced with original Knorr parts, yet the problem persists. The original poster notes the absence of a visible pressure regulation mechanism on the dryer base, which differs from typical models that feature an adjustable screw or pressure limiting valve. Responses highlight that contamination from compressor oil can cause valve malfunction by clogging pneumatic channels, and that some dryers may lack external pressure adjustment points. One suggested adjustment involves a pressure regulation screw on certain dehumidifier models, but the poster’s dryer base lacks this feature and includes two electrical connectors, one likely for a heater. The pressure issue remains regardless of connector status. Additional reports from other users indicate similar problems with pressure buildup despite replacing the dryer with a known working unit, leading to repeated BC light activation and risk of pipe failure. The discussion implies the need to inspect for internal valve faults, contamination, or defective dryer bases without external pressure regulation, as well as verifying valve operation under set pressure conditions.
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