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The diagnostic trouble code P1607 typically refers to a PCM (Powertrain Control Module) Internal Circuit Malfunction, though the exact definition can vary slightly depending on the vehicle manufacturer.

General Meaning:
P1607 - PCM Internal Circuit Malfunction

This code indicates that the PCM has detected an internal fault. It might be due to a failure in the processor, memory, or other internal circuits. It could also sometimes be triggered by poor electrical connections, voltage irregularities, or damaged wiring.

Common Causes:
Internal failure of the PCM

Poor battery or charging system condition

Corroded or loose PCM connectors

Damaged wiring harness

Grounding issues

Aftermarket tuning or programming issues

Common Symptoms:
Check Engine Light (CEL) on

Engine stalling or no-start

Poor performance

Inconsistent or erratic shifting (in automatic vehicles)

What to Do:
1Check battery voltage and charging system.

2Inspect all PCM-related wiring and grounds.

3Check PCM connectors for corrosion or loose pins.

4Reset the code and see if it returns.

5f the code persists and other electrical causes are ruled out, the PCM may need reprogramming or replacement.