P0C2BElectric/Auxiliary Transmission Fluid Pump Control Module Feedback Signal
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P0C2B concerns the status signal the auxiliary pump control module sends back to the controlling module. GM uses it on the Two-Mode hybrid trucks and SUVs (Tahoe, Yukon, Escalade, Silverado, Sierra, 2ML70): the hybrid controller expects a complete fault status message from the pump controller every 1.5 s; if it is missing or incomplete for 9.75 s with the vehicle in Run or Crank, the code sets as Type B, MIL after two trips. GM preliminary information PIP4751G stresses that P0C2B, with or without P2797, rarely means a bad pump: check the wiring, replace the pump control module if its date code is 089-11 or older, and note that a key held in Crank during a no-start can set it. P0C2C to P0C2E are the specific variants.
- What you may notice
- MIL after two drive cycles
- Bumps, lulls or surges around auto-stops
- Likely causes
- LikelyWiring or terminal tension fault between hybrid controller and pump control module
- PossibleEarly pump control module (GM date code 089-11 or older)
- RareKey held in crank for a long time during a no-start
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.