Threshold Value

P0420

Catalyst System Efficiency
Below Threshold Bank 1

• Measured OSC / OSC of
borderline catalyst measured
OSC EWMA filter value for
catalyst, < 1.00

P0441

Evaporative Emission System
Incorrect Purge Flow

• Deviation lambda control
< 7.00%
and
• Deviation idle control < 30.00%

P0444

Evaporative Emission System
Purge Control Valve Circuit
Open

Signal voltage > 4.70 - 5.40 V

P0450

Evaporative Emission System
Pressure Sensor/Switch

Signal voltage 0.39 - 0.55 V

P0451

Evaporative Emission System
Pressure Sensor/Switch
Range/Performance

Natural vacuum leak detection
(NVLD) switch position closed

P0452

Evaporative Emission System
Pressure Sensor/Switch Low

Signal voltage < 0.24 V

248

Audi A6/S6 Quick Reference Specification Book

•

September 2013

Error Message

Malfunction Criteria and
Threshold Value

P0453

Evaporative Emission System
Pressure Sensor/Switch High

Signal voltage > 3.0 V

P0456

Evaporative Emission System
Leak Detected (Very Small
Leak)

Natural vacuum leak detection
(NVLD) switch position open

P0458

Evaporative Emission System
Purge Control Valve Circuit
Low

Signal voltage 0.0 - 3.26 V

P0459

Evaporative Emission System
Purge Control Valve Circuit
High

Signal current > 2.20 A

P0461

Fuel Level Sensor "A" Circuit
Range/Performance

Difference between fuel
consumption and fuel level
changes < -12.00; > 12.00 [l]

P0462

Fuel Level Sensor "A" Circuit
Low

• Instument cluster module
signal: short to ground failure
• Instument cluster module
signal: signal range check
failure

P0463

Fuel Level Sensor "A" Circuit
High

Instument cluster module signal:
short to battery / open circuit
failure

Speed and Idle Control
DTC

Error Message

Malfunction Criteria and
Threshold Value

P0501

Vehicle Speed Sensor "A"
Range/Performance

Vehicle speed < 2 km/h

P0506

Idle Air Control System RPM
Lower Than Expected

• Engine speed deviation > 80
RPM
and
• RPM controller torque value ≥
calculated max value
• Integrated deviation of engine
speed low and integrated
deviation of engine speed high
> 2000 RPM

Audi A6/S6 Quick Reference Specification Book

•

September 2013

249

DTC Chart

DTC

DTC

Error Message

Malfunction Criteria and
Threshold Value

P0507

Idle Air Control System RPM
Higher Than Expected

• Engine speed deviation
< -80 RPM
and
• RPM controller torque value ≤
calculated min. value
or
• Integrated number of fuel cut
off transitions ≥ n.a.

P050A

Cold Start Idle Air Control
System Performance

• Integrated deviation of engine
speed low and integrated
deviation of engine speed high
> 2000 RPM
Out of range low:
• Engine speed deviation
˃ 80 RPM
and
• RPM controller torque value
≥ calculated max. value
Out of range high:
• Engine speed deviation
< -80 RPM
and
• RPM controller torque value
≤ calculated max. value
or
• Integrated number of fuel cut
off transitions ≥ n.a.

P050B

Cold Start Ignition Timing
Performance

Difference between commanded
spark timing vs. actual value >
20.00 - 35.00%

P052A

Cold Start "A" Camshaft
Position Timing OverAdvanced Bank 1

Difference between target
position and actual position
> 12.0° CRK

P053F

Cold Start Fuel Pressure
Performance

• Difference between target
pressure vs. actual pressure
< -2.00 MPa
• Difference between target
pressure vs. actual pressure
> 2.00 MPa

250

Audi A6/S6 Quick Reference Specification Book

•

September 2013

Control Module and Output Signals
Error Message

Malfunction Criteria and
Threshold Value

P0606

Control Module Processor

• Internal check failed
• Signal gradient > 7.50 kPa/s
• Signal gradient < -7.50 kPa/s
• Short to battery / open circuit
signal voltage > 4.80 v
• Short to ground signal voltage
< 0.20 v
• Out of range high measured
barometric pressure > 115.00
kPa
• Out of range low measured
barometric pressure < 45.00
kPa
• SPI communications check
Identifier failed

P062B

Internal Control Module Fuel
Injector Control Performance

SPI communications check
Identifier failure

P0634

PCM/ECM/TCM Internal
Temperature "A" Too High

Power stage temperature
> 150° C

P0638

Throttle Actuator Control
Range/Performance Bank 1

Rationality check open
movement:
• Time to open over reference
point > 0.6 Sec.
• Reference point -1.5%
• Time to close below reference
point > 0.3 Sec
• Reference point 1.0%
Rationality check closed
movement
• Time to close to reference
point > 0.6 Sec
• Reference point 2.88%
Signal range check at
mechanical stop low
• TPS 1 signal voltage
< 0.40 ˃ 0.80 V
• TPS 2 signal voltage < 4.20 4.60 V

P0641

Sensor Reference Voltage "A"
Circuit/Open

Signal voltage deviation
> ± 0.3 V

P0651

Sensor Reference Voltage "B"
Circuit/Open

Signal voltage deviation
> ± 0.3 V

P0657

Actuator Supply Voltage "A"
Circuit/Open

Signal voltage > 4.4 - 5.6 V

Audi A6/S6 Quick Reference Specification Book

•

September 2013

251

DTC Chart

DTC

DTC

Error Message

Malfunction Criteria and
Threshold Value

P0658

Actuator Supply Voltage "A"
Circuit Low

Signal voltage < 2.15 - 3.25 V

P0659

Actuator Supply Voltage "A"
Circuit High

Signal current > 1.10 A

P0697

Sensor Reference Voltage "C"
Circuit/Open

Signal voltage deviation
> ± 0.3 V

U0001

High Speed CAN
Communication Bus

CAN message, no feedback

U0002

High Speed CAN
Communication Bus
Performance

Global time out receiving no
message

U0101

Lost Communication with TCM Received CAN message no
message

U0121

Lost Communication With
Anti-Lock Brake System
(ABS) Control Module

Received CAN message no
message

U0146

Lost Communication With
Gateway "A"

Received CAN message no
message

U0302

Software Incompatibility with
Transmission Control Module

Received AT vehicle data TCM
signal

U0323

Software Incompatibility With
Instrument Panel Control
Module

AAT value (module not encoded
for AAT sensor)
FDh [-]

U0402

Invalid Data Received From
TCM

Received data implausible
message

U0415

Invalid Data Received From
Anti-Lock Brake System
(ABS) Control Module

• Received data implausible
message
• Speed sensor signal:
initialisation error 407.296 mph
• Speed sensor signal: low
voltage error 407.290 mph
• Speed sensor signal: sensor
error 407.303 mph

U0422

Invalid Data Received From
Body Control Module

AAT value (initialization) FDh [-]

U0423

Invalid Data Received From
Instrument Panel Cluster
Control Module

Received data implausible
message

U0447

Invalid Data Received From
Gateway "A"

Received data implausible
message

U1103

Production Mode Active

Production mode active

252

Audi A6/S6 Quick Reference Specification Book

•

September 2013

Fuel and Air Ratios Control Module
Error Message

Malfunction Criteria and
Threshold Value

P12A1

Rationality Check
Inappropriately Low

• Pressure control activity
> 0.25 MPa
and
• Fuel trim activity < 0.80
• Difference between target
pressure vs. actual pressure
-16.38 - 16.38 MPa

P12A2

Rationality Check
Inappropriately High

• Pressure control activity
< -0.20 MPa
and
• Fuel trim activity > 1.64 [-]
• Difference between target
pressure vs. actual pressure
-16.38 - 16.38 MPa

P12A4

Functional Check: Stuck
Closed

• Pressure control activity
< -10.00 mPa
• Fuel trim activity 0.85 - 1.15 [-]
• Difference between
commanded spark timing vs.
actual value < -16.38 mPa

P13EA Cold Start Ignition Timing
Performance Off Idle

Part load
• Difference between
commanded spark timing and
actual value > 20.00 - 45.00%

P150A

Engine Off Timer Performance Comparison of engine off time
from instrument cluster control
unit with engine after run time.
• Difference between engine off
time and ECM after run time
< -12.0 Sec.
Comparison of engine off time
from instrument cluster control
unit with engine after run time
• Difference between engine off
time and ECM after run time
> 12.0 Sec.

P169A

Loading Mode Active

Transport mode active

P2101

Throttle Actuator "A" Control
Motor Circuit Range/
Performance

• Duty cycle >80%
and
• ECM power stage, no failure
• Deviation throttle valve angles
vs. calculated value 4.0 50.0%

Audi A6/S6 Quick Reference Specification Book

•