P CODE FAMILY

Powertrain code references — Page 11.

Engine, transmission and powertrain diagnostic references. Exact vehicle and module context still matters.

Generic OBD-II

P03EC

These are code references, not a list of confirmed faults on every vehicle. Read the source and applicability notes, then match the exact vehicle, year, engine and scan report.

Intake profile actuator C needs its own commanded continuity evidence

The third intake profile output is checked for a ground-directed fault

A high intake profile-C circuit result needs the on/off conflict resolved

Unexpected movement on intake profile C must be tied to the absent command

The intake profile-C pin must complete its return sequence

Exhaust profile C is an electrical channel, not a bank-wide diagnosis

A low exhaust profile-C circuit must be judged during its on command

Do not reproduce a high exhaust profile-C fault from a contradictory state note

Exhaust profile-C performance depends on whether movement was requested

B Camshaft Profile Actuator C Control Stuck On Bank 1

B Camshaft Position Actuator Position Sensor C Circuit Bank 1

B Camshaft Position Actuator Position Sensor C Range/Performance Bank 1

B Camshaft Position Actuator Position Sensor C Circuit Low Bank 1

B Camshaft Position Actuator Position Sensor C Circuit High Bank 1

Ignition K Control Signal Circuit/Open

Ignition K Control Signal Circuit Low

Ignition K Control Signal Circuit High

Ignition L Control Signal Circuit/Open

Ignition L Control Signal Circuit Low

Ignition L Control Signal Circuit High

EGR flow is inferred from a controlled MAP response

insufficient high-pressure EGR inferred from an air model

excessive high-pressure EGR detected through an air residual

high-pressure EGR actuator open-load check

high-pressure EGR position does not follow its setpoint

high-pressure EGR SENT feedback below its electrical range

high-pressure EGR position feedback exceeds its upper range

low G212 EGR-position feedback and scoped software notes

high EGR-position feedback does not establish excessive EGR flow

EGR Sensor A Circuit

EGR Temperature Sensor A Circuit

EGR temperature plausibility needs a rise after the qualifying load

EGR temperature sensor A has a low electrical signal

The EGR temperature high-circuit result is a resistance-range finding

An erratic EGR temperature signal is assessed between consecutive samples

EGR temperature comparison after a long soak

Audi's secondary-air rationality monitor uses pressure deviation

Secondary-air flow compared with a pressure-based model

Secondary-air valve circuit feedback versus command

a small current threshold identifies an open secondary-air valve circuit

Audi's air-valve fault is evaluated as a ground-short voltage

AIR System Switching Valve B Circuit

valve B's open-circuit code needs electrical path identification

the CTUA valve-B fault points to a low electrical signal

Secondary-air pump control is an electrical test

AIR System Control B Circuit

EGR Temperature Sensor B Circuit

EGR temperature fails a post-soak response check

low-range EGR temperature feedback depends on sensor type

high-range EGR temperature circuit evidence

erratic EGR temperature changes between samples

AIR valve circuit low during an off command

Catalyst oxygen storage measured through a controlled mixture change

diesel oxidation-catalyst efficiency during regeneration

This catalyst efficiency check depends on an eligible regeneration event

Heated Catalyst Efficiency Below Threshold Bank 1

Heated Catalyst Temperature Below Threshold Bank 1

Catalyst Temperature Sensor Circuit Bank 1 Sensor 1

Catalyst Temperature Sensor Circuit Range/Performance Bank 1 Sensor 1

Catalyst Temperature Sensor Circuit Low Bank 1 Sensor 1

Catalyst Temperature Sensor Circuit High Bank 1 Sensor 1

Catalyst Heater Control Circuit/Open Bank 1

Catalyst Temperature Sensor Circuit Bank 1 Sensor 2

Catalyst Temperature Sensor Circuit Range/Performance Bank 1 Sensor 2

Catalyst Temperature Sensor Circuit Low Bank 1 Sensor 2

Catalyst Temperature Sensor Circuit High Bank 1 Sensor 2

high-pressure EGR remains open after drive removal

EGR stuck closed uses actuator-position evidence rather than flow alone

bank-2 catalyst oxygen-storage assessment

bank 2 warm-up catalyst efficiency and the firmware branch

main catalyst bank 2 efficiency needs exhaust and sensor evidence

Heated Catalyst Efficiency Below Threshold Bank 2

Heated Catalyst Temperature Below Threshold Bank 2

Catalyst Temperature Sensor Circuit Bank 2 Sensor 1

Catalyst Temperature Sensor Circuit Range/Performance Bank 2 Sensor 1

Catalyst Temperature Sensor Circuit Low Bank 2 Sensor 1

Catalyst Temperature Sensor Circuit High Bank 2 Sensor 1

Catalyst Heater Control Circuit/Open Bank 2

Catalyst Temperature Sensor Circuit Bank 2 Sensor 2

Catalyst Temperature Sensor Circuit Range/Performance Bank 2 Sensor 2