P006C — Absolute collector pressure - pressure correlation at the input of turbocompressor

Diagnostic algorithm

1. Read and record all stored DTCs and freeze frame data. Clear codes and perform test drive to re-create fault while monitoring live data.
2. With scan tool, monitor MAP (intake) and turbo inlet pressure sensor parameters simultaneously. Note values at idle, during slow throttle application, and at full load.
3. Visually inspect all charge-air plumbing (hoses, clamps, intercooler, connections) and perform a smoke or pressure test of the boost system to find leaks.
4. Inspect sensor connectors and wiring harness for damage, corrosion, or poor connections. Wiggle wires while monitoring live data for intermittent changes.
5. Verify sensor supply/reference voltage and ground at the sensor connector. Measure sensor output voltage while varying engine speed/load and confirm it moves smoothly and within expected range.
6. If sensor wiring and supply are good but readings are incorrect, bench-test or replace the suspect sensor(s) (MAP or turbo inlet pressure sensor) and re-check.
7. Check turbocharger operation: inspect actuator linkage/solenoid function, check for stuck wastegate, and inspect turbo for mechanical damage or excessive play.
8. After repairs, clear codes and perform functional test under load to confirm correct correlation and that P006C does not return.
9. If fault persists after components replaced and boost system verified, consider ECU module diagnostics or software update per manufacturer guidance.