P0606 on GMC vehicles An internal processor fault in the engine control module

A model year is listed because the code is named in its own record — a bulletin filed against it, or an owner’s complaint about it — not because every one of these vehicles sets it. Counts are documents in NHTSA’s files, not failure rates.

Owners’ own words, scrubbed of anything identifying. Unverified reports filed with NHTSA — what was said, not a finding that it was true.

Bulletins and campaigns GMC filed with NHTSA whose summary names P0606. Quote the document number at the service desk — it is a diagnosis the maker has already written down.

• PIT5946 Service bulletin
  2022-10-04 · Structure
• This Preliminary information communicates a diagnostic tip on how to resolve a issue with the Body Control Module setting DTC: P0606 and turning on a Check Engine Lamp.
• PIT6347 Service bulletin
  2025-02-25 · Service Brakes
• This Preliminary information communicates an issue with ABS SES MIL / Service Brake System / Service StabiliTrak / BSCM DTC P0606 P0562 and engineering is currently investigating.
• PIT6347A Service bulletin
  2025-03-11 · Service Brakes
• This Preliminary information communicates an issue with ABS SES MIL / Service Brake System / Service StabiliTrak / BSCM DTC P0606 P0562 and dealers to perform additional battery and connection testing.
• PIT5946B Service bulletin
  2023-01-26 · Structure
• This Preliminary information communicates a diagnostic tip on how to resolve a issue with the Body Control Module setting DTC: P0606 and turning on a Check Engine Lamp.
• PIT5946C Service bulletin
  2023-02-02 · Structure
• This Preliminary information communicates a diagnostic tip on how to resolve a issue with the Body Control Module setting DTC: P0606 and turning on a Check Engine Lamp.
• PIT5634 Service bulletin
  2018-10-01 · Service Brakes
• This Preliminary information communicates and issue with acustomer concern of a SES MIL, Reduced Engine Power, Service Brake System, and/orSpeed Limited message,a lack of brake assist making the brake pedal hard andDTCP0606. These issues can be caused by a low voltage conditions, but the EBCM incorrectly sets a DTC P0606 for aControl Module Processor Performance error. If the SI diagnostics are fo
• PIT5634 Service bulletin
  2018-11-14 · Service Brakes, Hydraulic
• This Preliminary information communicates and issue with a customer concern of a SES MIL, Reduced Engine Power, Service Brake System, and/or Speed Limited message, a lack of brake assist making the brake pedal hard and DTC P0606.  These issues can be caused by a low voltage conditions, but the EBCM incorrectly sets a DTC P0606 for a Control Module Processor Performance error.  If the SI diagnostic
• PIT5728 Service bulletin
  2019-12-20 · Electrical System
• This Preliminary information communicates an issue with DTC P0606 and C0021 setting after completing campaign N192268090 and it provides information about using and maintaining proper battery voltage while programming the BSCM.
• 24-NA-005 Service bulletin
  2024-01-10 · Electrical System
• This technical bulletin provides repair information to correct a customer concern of Headlamps Flashing and/or DTC P0606 Set in Lighting Control Module.
• 24-NA-050 Service bulletin
  2024-03-11 · Service Brakes, Hydraulic
• This technical bulletin provides repair information to correct a customer concern of Silverado and Sierra Setting DTC P0606 and either DTC P0562 or P0563.
• 24-NA-050 Service bulletin
  2024-06-29 · Electrical System
• This technical bulletin provides repair information to correct a customer concern of Silverado and Sierra Setting DTC P0606 and either DTC P0562 or P0563.
• PIT6347B Service bulletin
  2026-03-26 · Unknown Or Other
• This Preliminary information communicates an issue with ABS SES MIL / Service Brake System / Service StabiliTrak / BSCM DTC P0606 P0562 and dealers to perform additional battery and connection testing.

A stored code names the test that failed, never the part that caused it. The record above is what GMC and its owners have filed about it; the code’s page across every make has the whole file.