NHTSA ID Number: 10203512
Manufacturer Communication Number: QRSB Audi
A8 A8L
TSB/Document Date: 2021-11-15
Summary
Quick reference specification book.
Cylinder 3 Glow Plug Control
Circuit Low
• Glow current ≥ 70 A
P067A
Cylinder 4 Glow Plug Control
Circuit Low
• Glow current ≥ 70 A
P067B
Cylinder 4 Glow Plug Control
Circuit High
Error message from Glow
Control Unit
P067C
Cylinder 5 Glow Plug Control
Circuit Low
• Glow current ≥ 70 A
P067D
Cylinder 5 Glow Plug Control
Circuit High
Error message from Glow
Control Unit
P067E
Cylinder 6 Glow Plug Control
Circuit Low
• Glow current ≥ 70 A
P067F
Cylinder 6 Glow Plug Control
Circuit High
Error message from Glow
Control Unit
Audi A8/A8L/S8 Quick Reference Specification Book • September 2013 355
DTC Chart
DTC
DTC
Error Message
Malfunction Criteria and
Threshold Value
P0671
Cylinder 1 Glow Plug Circuit
Glow current ≤ 2.19 A
P0672
Cylinder 2 Glow Plug Circuit
Glow current ≤ 2.19 A
P0673
Cylinder 3 Glow Plug Circuit
Glow current ≤ 2.19 A
P0674
Cylinder 4 Glow Plug Circuit
Glow current ≤ 2.19 A
P0675
Cylinder 5 Glow Plug Circuit
Glow current ≤ 2.19 A
P0676
Cylinder 6 Glow Plug Circuit
Glow current ≤ 2.19 A
P0683
Glow Plug Control Module to
PCM Communication Circuit
LIN message no feedback
P0697
Sensor Reference Voltage "C"
Circuit Open
Voltage supply < 4.7 V or
> 5.3 V
U0001
High Speed CAN
Communication Bus
CAN message = no feedback
U0002
High Speed CAN
Communication Bus
Performance
Global time out receiving no
message
U0028
Vehicle Communication Bus A
CAN message = no feedback
U0029
Vehicle Communication Bus A
Performance
Global time out receiving no
message
U010E
CAN Communication Error
No Reducing Agent Metering
System Control Module -J880messages received.
U0101
Lost Communication with TCM No TCM messages received.
U0106
Lost Communication with
Glow Plug Control Module
No message received
U0121
Lost Communication with AntiLock Brake System (ABS)
Control Module
No CAN messages received
from ABS module
U0140
CAN communication with
Body Control Module
No CAN messages from BCM
U0146
Lost Communication with
Gateway "A"
CAN messages from Gateway
= no message.
U0155
Lost Communication With
Instrument Panel Cluster
(IPC) Control Module
No CAN messages received
from Instrument cluster
U02A3
CAN Communication with PM
Sensor
No CAN Message [-]
U0302
Software Incompatibility with
Transmission Control Module
Auto trans messages received
from ECM
356 Audi A8/A8L/S8 Quick Reference Specification Book • September 2013
Error Message
Malfunction Criteria and
Threshold Value
U0307
Software Incompatibility With
Glow Plug Control Module
Error bit = set
U0323
CAN: Instrument cluster Audi
only
Ambient temperature value
module not encoded for
ambient temp sensor, 00h
U040F
Invalid Data Received From
Reducing Agent Control
Module
Error bit = set
U0402
Invalid Data Received From
Transmission Control Module
Wrong TCM messages
received
U0407
Invalid Data Received From
Glow Plug Control Module
Implausible messages
received
U0415
Invalid Data Received From
Anti-Lock Brake System
Control Module
• Error bit = set
• Implausible data from ABS
or
• Speed sensor signal =
655.35 km/h
U0423
Invalid Data Received From
Instrument Panel Cluster
Control Module
Error message sent from
instrument cluster = invalid
data
U0447
Invalid Data Received From
Gateway "A"
Implausible message from
gateway
U04A4
NOx Sensor Communication
Check / Signal Range Check
Communication error
U1006
NOx Sensor 1 (Front) No
Communication
No messages from NOx
sensor 1 module
U1024
Communications Bus Fault
Error bit set
U1034
NOx Sensor 1 (Front)
Implausible signal
Data from NOx sensor 1
module implausible
U10C1
NOx Sensor 2 (Rear)
Implausible Signal
Data from NOx sensor 2
module implausible
U10C2
NOx Sensor 2 (Rear) No
Communication
No messages from NOx
sensor 2 module
U140C
Reductant Control Module
Supply Voltage Too Low
Supply voltage < 8.5 V
U140D
Reductant Control Module
Supply Voltage Too High
Supply voltage > 16.5 V
U140E
Reductant Control Module
Function Restriction Due to
Insufficient Voltage
Supply voltage < 9 V
Audi A8/A8L/S8 Quick Reference Specification Book • September 2013 357
DTC Chart
DTC
DTC
U140F
Error Message
Reductant Control Module
Function Restriction Due to
Excessive Voltage
Malfunction Criteria and
Threshold Value
Supply voltage > 16 V
Fuel and Air Ratios Control Module
DTC
Error Message
Malfunction Criteria and
Threshold Value
P1103
ECM: Production Mode
Production mode = Active
P1419
Exhaust Gas Recirculation
Cooler Switch-over Valve 2
Short circuit to Voltage
Diagnostic signal from power
stage > 1.5 A
P146D
Reducing Agent Tank Heater
Short Circuit to Voltage
Signal voltage > 3.27 V
P146F
Heater 2 for Reducing Agent
Short Circuit to Voltage
Signal voltage > 4.70 V
P148F
Exhaust Gas Recirculation
Cooler Switch-Over Valve 2
Electrical Malfunction
Diagnostic signal from power
stage < 2.97 V
P1499
Exhaust Gas Recirculation
Cooler Switch-Over Valve 2
Open Circuit/Short Circuit to
Ground
Diagnostic signal from power
stage > 4.5 V
P150A
Engine Off Time Performance
ECM time - IPC time > 12 Sec.
P21CA
Sensor supply voltage < 1 V
Reducing Agent Metering
System Control Module -J880detects short circuit of heater
supply voltage to B+
P21CC
Reducing Agent Metering
Sensor supply voltage > 7 V
System Control Module -J880detects short circuit of heater
supply voltage to ground
P21C7
Reducing Agent Metering
Supply voltage during
System Control Module -J880- activation > 7 V
detects short circuit to ground
on main relay
P21C9
Reducing Agent Metering
Supply voltage during
System Control Module -J880- activation < 1 V
detects short circuit to B+ on
main relay
P2100
Throttle Actuator Control
Motor Circuit/Open
Signal from power stage > 3.26
V and < 5.40 V
358 Audi A8/A8L/S8 Quick Reference Specification Book • September 2013
Error Message
Malfunction Criteria and
Threshold Value
P2101
Throttle Actuator Control
Motor Circuit Range/
Performance
Signal = no change
P2102
Throttle Actuator Control
Motor Circuit Low
Signal from power stage
≤ 3.26 V
P2122
Pedal Position Sensor D
Circuit Low Input
Signal voltage < 0.646 V
P2123
Pedal Position Sensor D
Circuit High Input
Signal voltage > 4.889 V
P2127
Pedal Position Sensor E
Circuit Low Input
Signal voltage < 0.276 V
P2128
Pedal Position Sensor E
Circuit High Input
Signal voltage > 2.644 V
P2138
Pedal Position Sensor D/E
Circuit Voltage Correlation
Signal voltage sensor 1 vs.
sensor 2 > 143 - 260 mV
P214E
Reducing Agent Metering
Current Over-Temperature
System Control Module -J880- diagnostic signal from output
Internal Temperature Too High driver
• Power stage temperature
> 140° C
P214F
Reducing Agent Metering
System Control Module -J880Internal Pump Temperature
Too High
P2146
Fuel Injector Group "A" Supply Diagnostic signal from power
Voltage Circuit Open
stage = internal signal
P2149/
P2152
Fuel Injector Group "C" Supply Diagnostic signal from power
Voltage Circuit/Open
stage = internal signal
P2181
Engine Coolant Temperature
Sensor On Radiator Outlet
Circuit Rationality Check
Deviation between target and
measured ECT value < -7.5 K
P2183
Engine Coolant Temperature
Sensor On Radiator Outlet
Circuit Cross Check
ECT on radiator outlet vs IAT
or AAT or FTS at start up
> 35 K
P2184
Engine Coolant Temperature
Sensor 2 Circuit Low
Signal voltage < 162 mV
P2185
Engine Coolant Temperature
Sensor 2 Circuit High
Signal voltage > 3255 mV
Current Over-Temperature
diagnostic signal from output
driver
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TSB/Document ID: QRSB Audi A8 A8L
Replacement Service Bulletin Number:
MFR Communication Date: 2013-09-01
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL
MFR Component System:
MFR Component Subsystem:
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