Ihc F4270, F4379: Not Entered

Affects Ihc F4270, F4379 · 1972–1975 — about 5 vehicles.

The hazard

TRUCKS EQUIPPED WITH PRE-121 KELSEY HAYES ANTI-LOCK BRAKE CONTROL SYSTEM. BRAKE CONTROL COMPUTER MODULE SYSTEMS MANUFACTURED PRIOR TO MARCH 1, 1975 MAY MALFUNCTION WHEN THE MODULES ARE SUBJECTED TO RADIO REQUENCY INTERFERENCE ABOVE 20 MEGAHERTZ AT POWER LEVELS IN IXCESS OF 30 WATTS FROM ON BOARD TWO-WAY RADIOS DURING SIMULTANEOUS BRAKING AND RADIO TRANSMISSION.

What to do

Contact your dealer; the remedy details were not included in the filing.

Critical — crash/injury risk now High — injury risk; see remedy Moderate — fix at next service Low — minor / informational