Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
The cost to diagnose the B1556 GMC code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.
The Instrument Panel Cluster (IPC) uses no external circuits for the operation that sets this Diagnostic Trouble Code (DTC). The IPC stores 3 redundant copies of the vehicle odometer mileage within the EEPROM. The 3 EEPROM mileage records stored mileage records must agree.
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Get the B1556 GMC code diagnosed by a professional: Find a repair shop in your area