What does GMC P1604 mean?

GMC code P1604: Loss Of IPC Serial Data. It relates to the powertrain on GMC vehicles.

Can P1604 be turned off in the ECU?

DTC removal is possible for off-road/motorsport use after the underlying fault or hardware change (e.g. DPF/EGR removal). Safety-critical codes should be fixed, not suppressed.

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GMC • powertrain

GMC P1604

Loss Of IPC Serial Data

What P1604 means on a GMC

On GMC vehicles, P1604 is logged when the ECU detects a fault in the powertrain: “Loss Of IPC Serial Data”. P1604 is a manufacturer-specific GMC code (the "1" after the letter marks an OEM-defined code), so its meaning applies to GMC and may differ on other makes.

Common causes & symptoms

Typical triggers for a powertrain code like P1604 include faulty or ageing sensors, wiring/connector faults, a clogged or removed component, or a value drifting outside the ECU's expected window. Symptoms range from a check-engine light only, to limp mode, rough running, higher consumption or failed emissions tests.

P1604 and ECU tuning

When a GMC has had hardware changed for off-road/motorsport use (for example a removed DPF or EGR), the related monitor must be disabled in the ECU map or the code re-appears. Softechpro Solutions performs DPF/EGR/AdBlue/DTC off and recalculates the checksum, so codes like P1604 stay cleared after the flash. Genuine faults should always be repaired, not just hidden.

Related GMC codes

P1600 P1601 P1602 P1603 P1605 P1606 P1607 P1608

Need to clear P1604 after a delete?

Softechpro Solutions does DPF/EGR/AdBlue/DTC off + checksum for 260+ ECU families — from €98.99/mo.

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