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Generic OBD-II code references — Page 46.

Read the source definition and confirm the exact vehicle, reporting module and diagnostic procedure.

Generic OBD-II

P2081

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.

EGT sensor 1 changes faster than the monitor permits

Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 2 Sensor 1

Exhaust Gas Temperature Sensor Circuit Intermittent Bank 2 Sensor 1

EGT sensor 2 has insufficient warming response after soak

rapid raw-temperature changes from EGT sensor 2

Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 2 Sensor 2

Exhaust Gas Temperature Sensor Circuit Intermittent Bank 2 Sensor 2

bank-one intake actuator control is low while its high-side driver is on

cam-actuator high input must be read with driver architecture

Why the DEF pump may stop before an open circuit is identified

reductant pump speed fails to follow its command

Separating a DEF pump ground-short report from a pressure fault

pump short-to-power is isolated after the pump is stopped

Reductant valve stuck closed is evaluated over injection strokes

Reductant Injection Valve Stuck Closed Bank 2 Unit 1

Exhaust camshaft actuator circuit low during powered operation

Exhaust camshaft actuator circuit high and the driver-off check

The bank 2 intake cam actuator’s low-circuit check

A bank 2 intake cam driver that remains high when commanded on

Recognizing the bank 2 exhaust cam actuator’s low electrical fault

When the bank 2 exhaust cam actuator driver fails its on-state check

Post-catalyst fuel correction reaches the lean limit

Post-catalyst fuel correction reaches the rich limit

Post-catalyst lean wording and the bank 2 upstream-sensor offset check

Bank 2 rich post-catalyst trim as an upstream lambda-offset diagnosis

Reductant Injection Air Pressure Sensor B Circuit

Reductant Injection Air Pressure Sensor B Circuit Range/Performance

Reductant Injection Air Pressure Sensor B Circuit Low

Reductant Injection Air Pressure Sensor B Circuit High

Reductant Injection Air Pressure Sensor A/B Correlation

Ram DEF-tank heater performance warning and DCU software

reductant purge-driver feedback is wrong while commanded off

reductant pressure-reduction performance needs its own test state

low purge-valve feedback is evaluated with the driver off

purge-driver feedback remains high during the on command

Reductant Purge Control Valve A Stuck Open

Reductant Purge Control Valve A Stuck Closed

Reductant Injection Air Pressure Control Valve Circuit/Open

Reductant Injection Air Pressure Control Valve Performance

Reductant Injection Air Pressure Control Valve Circuit Low

Reductant Injection Air Pressure Control Valve Circuit High

Reductant Injection Air Pressure Control Valve Stuck Open

Reductant Injection Air Pressure Control Valve Stuck Closed

Reductant Metering Unit Temperature Sensor Circuit

Reductant Metering Unit Temperature Sensor Circuit Range/Performance

Reductant Metering Unit Temperature Sensor Circuit Low

Reductant Metering Unit Temperature Sensor Circuit High

Reductant Metering Unit Temperature Sensor Circuit Intermittent/Erratic

Reductant Heater Coolant Control Valve Circuit/Open

Reductant Heater Coolant Control Valve Performance/Stuck Open

Reductant Heater Coolant Control Valve Circuit Low

Reductant Heater Coolant Control Valve Circuit High

metering-unit heater conductance is checked during heating

Reductant Metering Unit Heater Control Circuit Performance

the metering-unit heater's low-conductance start check

high metering-heater conductance is not high tank temperature

How the first DEF tank heater is checked for an open circuit

When DEF tank heater power or calculated resistance misses its target

heater 1 ground-short classification uses an off-state test

Understanding a high-circuit failure on DEF tank heater 1

Why an open DEF line-heater circuit is distinct from a tank-heater fault

line-heater performance checks resistance and delivered power

Reading a DEF line-heater low-circuit diagnosis correctly

A DEF line-heater short-to-power report and its diagnostic shutdown

heater C maps to the second tank heater in this system

Checking the second DEF tank heater’s resistance and power performance

Locating the meaning of a low circuit on the second DEF tank heater

heater 3 short-to-power is confirmed with heating switched off

Reductant Heater D Control Circuit/Open

Reductant Heater D Control Circuit Performance

Reductant Heater D Control Circuit Low

Reductant Heater D Control Circuit High

Reductant Control Module Requested MIL Illumination

Reductant Injection Air Pressure Leakage

The exhaust fuel injector’s open check uses different driver states

aftertreatment injector performance is judged through exhaust heat

A low aftertreatment-injector circuit result has separate recovery logic

A high exhaust injector circuit can be reported through on-state overcurrent

Exhaust Aftertreatment Fuel Injector A Stuck Open

Exhaust Aftertreatment Fuel Injector A Stuck Closed