Malfunction Criteria and
Threshold Value

P0420

Catalyst System Efficiency
Below Threshold Bank 1

Amplitude ratio O2S < 1

P0441

EVAP System Incorrect Purge
Flow

• Deviation lambda control
< 2.00 to 7.00%
and
• Deviation idle control < 30.00%

P0442

EVAP System Leak Detected
(small leak)

Time for pressure drop < 1.60 to
1.80 Sec.

P0444

EVAP System Purge Control
Valve “A” Circuit Open

Signal voltage> 4.70 to 5.40 V

P0455

EVAP System Leak Detected
(large leak)

Time for pressure drop < 1.00
Sec.

P0456

EVAP System Leak Detected
(very small leak)

Pressure Check:
• Time for pressure drop < 5.0 to
6.5 Sec.

P0458

EVAP System Purge Control
Valve “A” Circuit Low

Signal voltage, 0.00 to 3.26 V

P0459

EVAP System Purge Control
Valve “A” Circuit High

Signal current, > 2.20 A

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Speed and Idle Control
Error Message

Malfunction Criteria and
Threshold Value

P0501

Vehicle Speed Sensor “A”
Circuit Range/Performance

Vehicle speed < 2 MPH

P0503

Vehicle Speed Sensor “A”
Circuit Intermittent/Erratic/
High

Vehicle speed >200.0 km/h

P0506

Idle Air Control System RPM
Lower Than Expected

• Engine speed deviation
< -80 RPM
and
• RPM controller torque value
≥ calculated max. value
or
• Integrated deviation of engine
speed low and integrated
deviation of engine speed high
> 2000.0 RPM

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

Plausibilty Check:
• 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 min. value

P050B

Cold Start Ignition Timing
Performance

Difference between commanded
spark timing vs. actual value
> 18.00%

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October 2013

155

DTC Chart

DTC

DTC

Error Message

Malfunction Criteria and
Threshold Value

P052A

Cold Start “A” Camshaft
Position Timing OverAdvanced Bank 1

Difference between target
position and actual position
> 6.0° CRK

P053F

Cold Start High Fuel Pressure
Performance

• Difference between target
pressure vs. actual pressure
< -1.50 MPa
or
• Difference between target
pressure vs. actual pressure
> 1.50 MPa

Control Module and Output Signals
DTC

Error Message

Malfunction Criteria and
Threshold Value

P0601

Internal Control Module
Memory Check Sum Error

Internal check sum, incorrect

P0604

Internal Control Module
Random Access Memory
(RAM) Error

Write ability check, failed

P0605

Internal Control Module Read
Only Memory (ROM) Error

Checksum incorrect

P0606

Control Module Processor

Module internal check failure.

P062B

Internal Control Module Fuel
Injector Control Performance

SPI communications check
Identifier failure

P0638

Throttle Actuator Control
Range/Performance Bank 1

Rationality check:
• Time to close to reference
point > 0.56 Sec.
and
• Reference point 2.88%
Signal range check:
• Duty cycle > 80%
and
• ECM power stage, no failure
• TPS 1 signal voltage < 0.40;
> 0.80 V
or
• TPS 2 signal voltage < 4.20;
> 4.60V

P0641

Sensor Reference Voltage “A”
Circuit/Open

Signal voltage deviation
> +/- 0.30 V

P0642

Sensor Reference Voltage “A”
Circuit Low

Signal voltage, < 4.6 to 5 V

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October 2013

Error Message

Malfunction Criteria and
Threshold Value

P0643

Sensor Reference Voltage “A”
Circuit High

5 V supply voltage > 5 to 5.4 V

P0651

Sensor Reference Voltage “B”
Circuit/Open

Signal voltage deviation
> +/- 0.30 V

P0652

Sensor Reference Voltage “B”
Circuit Low

Signal voltage, < 4.6-5 V

P0653

Sensor Reference Voltage “B”
Circuit High

5 V supply voltage > 5 to 5.4 V

P0657

Actuator Supply Voltage A
Circuit/Open

Signal voltage > 4.4 - 5.6 V

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

P0685

ECM/PCM Power Relay
Control Circuit/Open

• Signal voltage 2.6 - 3.7 V
• Sense circuit voltage < 6 V

P0686

ECM/PCM Power Relay
Control Circuit Low

• Signal voltage 2.6 - 3.7 V
• Sense circuit voltage > 6 V

P0687

ECM/PCM Power Relay
Control Circuit High

• Signal current > 1.4 - 0.7 A
• Sense circuit voltage < 6 V

P0688

ECM/PCM Power Relay
Sense Circuit

• Sense voltage < 3.0 V
• Sense voltage > 3.0 V

P0697

Sensor Reference Voltage “C”
Circuit/Open

Signal voltage deviation
> +/- 0.30 V

P0698

Sensor Reference Voltage “C”
Circuit Low

Signal voltage < 4.6 - 5.0 V

P0699

Sensor Reference Voltage “C”
Circuit High

5V supply voltage > 5.0 5.4 V

U0001

High Speed CAN
Communication Bus

CAN message, no feedback

U0002

High Speed CAN
Communication Bus
Performance

Global time out-receiving no
message

U0100

Lost Communication With
ECM/PCM “A”

• Failure of all CAN engine
messages, time out more than
> 490 mSec.
• Failure of all CAN engine
messages, but not all CAN
messages, time out more than
> 1010 mSec.

Audi TT Quick Reference Specification Book

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October 2013

DTC Chart

DTC

157

DTC

Error Message

Malfunction Criteria and
Threshold Value

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”

CAN communication with
gateway, time-out

U0155

Lost Communication With
Instrument Panel Cluster
(IPC) Control Module

Received CAN message - no
message

U0302

Software Incompatibility with
Transmission Control Module

TCM signal received AT vehicle
data

U0323

Software Incompatibility With
Instrument Panel Control
Module

AAT value (module not encoded
for AAT sensor) 0.00 h

U0402

Invalid Data Received From
TCM

Received data implausible
message

U0404

Invalid Data Received From
Gear Shift Control Module “A”

• If the value of message
counter is permanent,
constant, or change exceeds a
threshold, increment an event
counter
• Maximum change of message
counter > 5

U0415

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

• Received data implausible
message
• Speed sensor signal 203.0
MPH
• Speed sensor signal 203.0
MPH
• Initialisation error
• Vehicle speed 202.00 MPH

U0422

Invalid Data Received From
Body Control Module

Ambient temp. value
(initialization), Audi, 01h

U0423

Invalid Data Received From
Instrument Panel Cluster
Control Module

• AAT value (initialization) 1.0 h
• Received data implausible
message

U0447

Invalid Data Received From
Gateway “A”

CAN message incorrect

U1030

LIN Communication

LIN message, incorrect

U102F

LIN Communication

Time out

U102E

LIN Communication

Not active

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Fuel and Air Ratios Control Module
Error Message

Malfunction Criteria and
Threshold Value

P1114

O2 Sensor Heater Circuit