Powertrain, generic (extended)

P276C Electric/Auxiliary Transmission Fluid Pump B Motor Supply Voltage Circuit High

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

P276C flags an excessive voltage on the motor supply of auxiliary pump B. Either the circuit is shorted to another powered line, the pump module measures wrongly, or the vehicle charging system itself overshoots. No manufacturer documents P276C publicly. Audi's bulletin 34-17-25 identifies pump B on its 0CJ, 0CK and 0CL dual-clutch units as the gear oil pump V553 and lists the low-voltage sibling P276B for it; P0B0B is the matching high code for pump A. CARB requires actuators to be watched for out-of-range electrical values. An overvoltage can overheat the pump electronics, so many modules switch the pump off. Before replacing parts, measure the charging voltage at running engine and inspect the supply wiring for chafing.

Likely causes

Charging system voltage too high
Supply wire shorted to another powered circuit
Faulty measurement in the pump control electronics

Symptoms

  • Transmission warning lamp
  • Pump switched off, stop-start unavailable
  • Other overvoltage codes if charging is at fault

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–1,200
Time0.5–4 h

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

Parts involved

aux trans pump bsupply circuitcharging system

Related codes

P276AP276BP276DP0B0B

References: law.cornell.edu, static.nhtsa.gov.