Error code

OBD2 P0606

OBD2P0606
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

ECM/PCM Processor.

Severity

severeDriving may be possible but with significant issues such as engine stalling and erratic shifting. It is recommended to address this issue promptly.

Summary

Code P0606 indicates that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected an internal processor malfunction.

Symptoms

  • Multiple and varied engine drivability issues
  • Harsh or erratic automatic transmission shifting
  • Diminished fuel economy
  • Engine stalling or running roughly, especially at idle
  • Hesitation upon acceleration
  • Other system malfunctions (ABS, TCS, IPC, BCM, or TCM)

Common Causes

  • Blown ECM/PCM fuse
  • Bad ECM/PCM power supply relay
  • Defective ECM/PCM module
  • Open or shorted wiring or connectors in the CAN harness
  • Insecure control module ground strap or broken ground wire

Diagnosis

  1. Perform a visual inspection of visible wiring and harnesses related to vehicle controllers.
  2. Check chassis and engine ground junctions for cleanliness and security using a digital volt/ohmmeter (DVOM).
  3. Inspect the ECM/PCM module for signs of water, heat, or collision damage.
  4. Test and replace blown fuses and check relay connectors as recommended by a vehicle information source.

Fixes

  • Replace defective ECM/PCM if diagnosed as faulty. Vehicle match programming may be required.

FAQ

What should I do if my car has P0606?

It's recommended to perform preliminary checks such as inspecting wiring, fuses, and relays. If these are fine, the ECM/PCM may need replacement.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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