P0C2B code meaning
Electric/Auxiliary Transmission Fluid Pump Control Module Feedback Signal
Powertrain system Generic code P0Cxx codes Check engine light
What P0C2B means
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.
P0C2B at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairAfter a drive cycle
Symptoms of P0C2B
- MIL after two drive cycles
- Bumps, lulls or surges around auto-stops
Common causes of P0C2B
- Most likelyWiring or terminal tension fault between hybrid controller and pump control module
- PossibleEarly pump control module (GM date code 089-11 or older)
- Less likelyKey held in crank for a long time during a no-start
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Aux trans pump control moduleWiring harnessTCM
What each part of P0C2B means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| C | Area: hybrid propulsion. |
| 2B | The exact fault in that area. |
What to do next
- Note P0C2B and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0C2B
What does P0C2B mean?
P0C2B means "Electric/Auxiliary Transmission Fluid Pump Control Module Feedback Signal". P0C2B concerns the status signal the auxiliary pump control module sends back to the controlling module. It is a generic code, so it means the same on every make.
Is it safe to drive with P0C2B?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P0C2B fail an emissions test?
Yes, it can. P0C2B is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0C2B to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P0C2B clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.