Powertrain, generic · Hybrid propulsion

P0C26 Electric/Auxiliary Transmission Fluid Pump A Motor Current

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0C26 is the general motor current fault of auxiliary pump A: the current drawn does not match what the commanded operating point should need, without clearly being too low or too high. No manufacturer documents this exact code publicly. Its siblings show what is monitored: Ford stores P0C27, current too low, on 2014-16 Fusion and 2015-16 Edge with the 6F35 start-stop transmission when air enters the pump supply tube, and GM sets P0C28 on the Volt and ELR when any phase exceeds 35 A. CARB requires such components to be checked for rationality. A general current code therefore points to aeration, low fluid, a binding pump or current sensing errors. The pump may be switched off and auto-stop blocked; P0C27 and P0C28 are the specific variants.

Likely causes

Low or aerated transmission fluid at the pump intake
Pump binding or contaminated, changing the motor load
Current sensing in the pump driver implausible
Outdated control software of the pump or controlling module

Symptoms

  • MIL or transmission warning
  • Harsh engagement after an auto-stop
  • Start-stop deactivated

Repair estimate

DifficultyHardWorkshop job
Parts and labour€80–1,500
Time0.5–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

aux trans pump a motor

Related codes

P0C27P0C28P0C2AP2797

References: law.cornell.edu, static.nhtsa.gov, gsi.ext.gm.com.