Transmission Control Module --, AQ450-8A (8 SPEED) 09P2, 2024 MY

WARNING: This page is about a different car, the 2024 Audi A4 Quattro. However, it is still accessible from the selected car via links, so may be relevant.

Component / System	DTC / DTC Description	Monitor Strategy Description	Malfunction Criteria	Threshold Value	Secondary Parameters	Enable Conditions	Monitor Time Length	MIL Illum. US
Shift Solenoid
S1	P0973 - Shift Solenoid "A" Control Circuit Low	Conduction check in ON/OFF solenoid.	Each correspondence solenoid port signal is OFF.	Wrong output signal for more than 100 ms	Ignition Voltage ATCU commands each solenoid.	ON >= 9.0 V and <= 17.0V ON	100ms 5 times	2 DCY
S1	P0974 - Shift Solenoid "A" Control Circuit High		Each correspondence solenoid port signal is ON.	Wrong output signal for more than 100 ms	Ignition Voltage ATCU commands each solenoid.	ON >= 9.0 V and <= 17.0V OFF
Pressure Control Solenoid
SLT	P0748 - Pressure Control Solenoid "A" Electrical	Linear solenoid feedback current stuck check	The difference between target current for each linear solenoid and feedback current from each linear solenoid is greater than a calibrated value.	1) Sum of difference of two current >20000 mA or 2) Absolute of difference of two current > 50 mA for more than 1000 m sec	Input AD value Ignition Voltage Main Solenoid Switch SLC1, SLC2, SLC3, SLC4, SLB1, SLT	< 1333 mA ON > 10.5 V ON No fault	1) 3 times 2) 2000 m sec	2 DCY
SL5	P0778 - Pressure Control Solenoid "B" Electrical
SL1	P0798 - Pressure Control Solenoid "C" Electrical
SL2	P2716 - Pressure Control Solenoid "D" Electrical
SL3	P2725 - Pressure Control Solenoid "E" Electrical
SL4	P2734 - Pressure Control Solenoid "F" Electrical
SLU	P2759 - Torque Converter Clutch Pressure Control Solenoid Control Circuit Electrical
SLT	P0963 - Pressure Control Solenoid "A" Control Circuit High	Input AD value check in every Linear solenoid.	Feedback current of linear solenoid is greater than calculated value.	Feedback current > 1333 mA (AD value > 1000) for more than 100 ms	Ignition Voltage	ON >= 9.0 V and <= 17.0 V	100 ms 5 times
SL5	P0777 - Pressure Control Solenoid "B" Stuck On
SL1	P0797 - Pressure Control Solenoid "C" Stuck On
SL2	P2715 - Pressure Control Solenoid "D" Stuck On
SL3	P2724 - Pressure Control Solenoid "E" Stuck On
SL4	P2733 - Pressure Control Solenoid "F" Stuck On
SLU	P2758 - Torque Converter Clutch Pressure Control Solenoid Control Circuit Stuck On
SLT	P0962 - Pressure Control Solenoid "A" Control Circuit Low		Feedback current of linear solenoid is smaller than calculated value.	Feedback current < 23 mA (AD value < 15) for more than 100 ms	Ignition Voltage	ON >= 9.0 V and <= 17.0 V	100 ms 5 times
SL5	P0776 - Pressure Control Solenoid "B" Performance/Stuck Off
SL1	P0796 - Pressure Control Solenoid "C" Performance/Stuck Off
SL2	P2714 - Pressure Control Solenoid "D" Performance/Stuck Off
SL3	P2723 - Pressure Control Solenoid "E" Performance/Stuck Off
SL4	P2732 - Pressure Control Solenoid "F" Performance/Stuck Off
SLU	P2757 - Torque Converter Clutch Pressure Control Solenoid Control Circuit Performance/Stuck Off
Speed sensor
Output speed sensor	P19AB - Output Speed Sensor Intermittent/Circuit Low	Electrical check	Voltage of each speed sensor is lower than calibrated value.	Voltage < 0.206 Volt (AD value < 45) for more than 100 ms	Ignition Voltage	ON >= 9.0 V and <= 17.0 V	100 ms 5 times	2 DCY
	P077D - Output Shaft Speed Sensor Circuit High	Electrical check	Voltage of each speed sensor is greater than calibrated value.	Voltage > 2.727 Volt (AD value > 545) for more than 100 ms	Ignition Voltage	ON >= 9.0 V and <= 17.0 V	100 ms 5 times
	P0721 - Output Shaft Speed Sensor Circuit Range/Performance	No pulse check	Comparison pulse of input revolution and output revolution	No pulse of output sensor during 57 pulses of input sensor	Ignition	ON	500 ms
					Voltage	>= 9.0 V and <= 17.0 V
					Engine speed	> 400 rpm
					emergency mode	None
					Garage shifting	None
					Time after garage shifting	>= T_GarageFin
					Neutral control	None
					Time after Neutral control	>= T_NConFin
					Shifting	None
					Time after shifting	>= T_ShiftFin
					Range	D, S
					Inhibitor switch	No fault
					Input sensor	No back up condition
					S1, SLC1, SLC2, SLC3, SLC4, S LB1, SLT	No fault
					(Input rev. / defined current gear ratio)	>= 300 rpm
					Output sensor	Not during failure detection or after failure decision for output sensor electrical failure.
Input speed sensor	P19AA - Input/Turbine Speed Sensor Intermittent/Circuit Low	Electrical check	Voltage of each speed sensor is lower than calibrated value.	Voltage < 0.206 Volt (AD value < 45) for more than 100 ms	Ignition Voltage	ON >= 9.0 V and <= 17.0 V	100 ms 5 times
	P07C0 - Input/Turbine Shaft Speed Sensor "A" Circuit High	Electrical check	Voltage of each speed sensor is greater than calibrated value.	Voltage > 2.727 Volt (AD value < 545) for more than 100 ms	Ignition Voltage	ON >= 9.0 V and <= 17.0 V	100 ms 5 times
	P0716 - Input/Turbine Shaft Speed Sensor "A" Circuit Range/Performance	No pulse check	Comparison pulse of input revolution and output revolution	No pulse of input sensor during 6 pulses of output sensor	Ignition	ON	500 ms
					Voltage	>= 9.0 V and <= 17.0 V
					Engine speed	> 400 rpm
					Output sensor	No back up condition
					Output speed	>= 300 rpm
					Input sensor	Not during failure detection or after failure decision for input sensor electrical failure.
Inhibitor switch AQ450-8F
Inhibitor switch	P0706 - Transmission Range Sensor "A" Circuit Range/Performance	A, B, C and PA signal check in every shift lever position.	Detection of wrong combination of the A, B, C and PA signal	Wrong combination for more than 350 ms	Ignition Voltage	ON >= 9.0 V and <= 17.0 V	350 ms	2 DCY
Inhibitor switch	P0709 - Transmission Range Sensor "A" Circuit Intermittent		Detection of no signal of the A, B, C and PA signal	All signals lost
Oil temperature sensor
Oil temperature sensor Stuck	P0710 - Transmission Fluid Temperature Sensor "A" Circuit	Electrical check	Change of the oil temperature is lower than calibrated value	Measurement block shows Value smaller than 30° C and doesn't change this value by 1°C	Ignition	ON	15 min	2 DCY
					Voltage	>= 9.0 V and <= 17.0 V
					oil temp.	-55° C to 200° C
					Engine speed	> 400 rpm
					Range	D, S
Oil temperature sensor High Stuck			Oil temperature is greater than calibrated value.	Measurement block shows Value > 120° C	Ignition Voltage EG coolant temp EG coolant temp. was after EG coolant temp. was	ON >= 9.0 V and <= 17.0 V No fault > 50° C for 10 s <45° C for 10 s	10 ms
Oil temperature sensor GND short	P0712 - Transmission Fluid Temperature Sensor "A" Circuit Low		Voltage of the oil temperature sensor is smaller than calibrated value.	Measurement block shows Value of 200° C	Ignition Voltage Engine speed	ON >= 9.0 V and <= 17.0 V > 400 rpm	5 s
Oil temperature sensor Battery short / open	P0713 - Transmission Fluid Temperature Sensor "A" Circuit High		Voltage of the oil temperature sensor is greater than calibrated value.	Measurement block shows Value of -55° C	Ignition Voltage Engine speed	ON >= 9.0 V and <= 17.0 V > 400 rpm	10 s
Battery Voltage
Battery voltage 1/2ow supply	P0562 - System Voltage Low	Battery voltage check	Detection of low voltage value	Battery voltage < 9 V	Ignition (input speed Engine speed	ON > 400 rpm for 2 s or > 400 rpm for 2 s)	20 s	2 DCY
Microcontroller Hardware
Flash ROM	P0700 - Transmission Control System (MIL Request)	ROM area check	Comparison of stored checksum value and calculated checksum	Two checksum values are not the same.	Ignition	ON	40 s	2 DCY
NvRAM		ROM area check	Comparison of writing data and reading data.	Writing data is different from reading one.	Ignition	ON
Random Access Memory		RAM area check	Comparison of writing data and reading data.	Writing data is different from reading one.	Ignition	ON
Functional Safety
Safety function	P2711 - Unexpected Mechanical Gear Disengagement	To check solenoid state	Check of solenoid state pattern and input torque	to detect braking torque > 1948 Nm	Ignition	ON	700 ms	2 DCY
Wrong gear select detection (by New Gear)	P0613 - TCM Processor	To check target gear	Detection of wrong target gear	target gear < allowed lowest gear	Ignition	ON	150 ms
Wrong gear select detection (by Solenoid Gear)		To check solenoid state	Detection of wrong solenoid state pattern	gear judged from solenoid pattern < allowed lowest gear	Ignition	ON	150 ms
Wrong gear select detection (by suddenly downshift)		To check solenoid state	Detection of suddenly downshift with solenoid state pattern	gear change judged from solenoid pattern in 100 ms < allowed lowest gear	Ignition	ON	100 ms
Wrong gear select detection (by Engine PRM)		To check engine speed	Detection of engine over revolution	engine speed > over revolution value x 1.05	Ignition	ON	150 ms
Non-engagement of the parking lock detection	P07E4 - Unable to Engage Park	To check parking position	Actual position from shift-by-wire actuator compared to target position	Actual position signal is not P or Actual position signal status is not normal	Target position	P	1500 ms
Unintended disengagement of parking lock detection	P288B - Park Lock/Pawl Actuator Circuit Performance	To check parking position	To detect unintended command or unintended actual position (1 or 2)	1; Target position is P and CAN commanded position is not P	1; Target position CAN commanded position	1: P P or Auto P	1; 20 ms
Unintended disengagement of parking lock detection	P288B - Park Lock/Pawl Actuator Circuit Performance			2; Target position is P and Actual position from position switch is not P	2; Target position Actual position	2; P P	2; 200 ms
Wrong direction engagement detection	P0613 - TCM Processor	To check actual position	To detect unintended actual position from position switch (1 or 2)	1; Target position is R and Actual position is D or Target position is N and Actual position is R or D or Target position is D and Actual position is R	1; Target position Actual position or Target position Actual position or Target position Actual position	1; R R N N D D	1; 100 ms
Wrong direction engagement detection				2; Target position is R and Actual position is N or D or Target position is N and Actual position is R or D or Target position is D and Actual position is R or N	none	-	2; 1500 ms
CPU core check		Input Other Rationality check	To detect a CPU processing error	Abnormal CPU processing is detected by using a micro controller function	Ignition	ON	1 Time
ROM check		Input Other Rationality check	To detect an error about the ROM	ROM error is detected by using the micro controller functions and software function.	Ignition	ON	1 Time
RAM data protection		Input Other Rationality check	To check detect about the RAM	ROM error is detected by using the micro controller functions and software functions.	Ignition	ON	1 Time
Program flow check		Input Other Rationality for TCM program miscalculation check	To detect TCM program flow problem	Comparison of processing address and pre-defined address.	Ignition	ON	1 Time
Clock monitoring		Input Other Rationality check	To detect an error about the clock	Clock error is detected by using the micro controller function.	Ignition	ON	1 Time
Power supply check		Input Other Rationality check	To detect an failure about the Power supply IC	Power supply IC error is detected	Ignition	ON	1 Time
Safe state shift check		Solenoid state check	To check the Solenoid cut monitor when Solenoid cut drive outputs "ON" signal	Solenoid cut monitor = OFF	Ignition	ON -> OFF	1 Time
Built in Self Test (BIST)		Input Other Rationality check	To detect errors of error detection functions	BIST error is detected by using the micro controller function.	Ignition	ON	1 Time
CAN
Bus off	U0001 - High Speed CAN Communication Bus	CAN communication check	Detection of communication error	CAN controller becomes Bus off.	Communication initialization Ignition Voltage	TRUE ON >= 9.0 V and <= 17.0 V	1 Time	2 DCY
ECU no communication (640h)	U0100 - Lost Communication With ECM/PCM "A"	CAN communication check	Detection of communication error	ECU no communication	CAN bus	Active	max. 5000 ms**
ECU no communication (640h)					ignition Voltage	ON >= 9.0 V and <= 17.0 V
ECU no communication (0A7h)		CAN communication check	Detection of communication error	ECU no communication	CAN bus	Active	max. 5000 ms**
ECU no communication (0A7h)					ignition Voltage	ON >= 9.0 V and <= 17.0 V
ECU no communication (0A8h)		CAN communication check	Detection of communication error	ECU no communication	CAN bus	Active	max. 5000 ms**
ECU no communication (0A8h)					ignition on Voltage	> 500 ms >= 9.0 V and <= 17.0 V
ECU no communication (3BEh)		CAN communication check	Detection of communication error	ECU no communication	CAN bus	Active	max. 5000 ms**
ECU no communication (3BEh)					ignition Voltage	ON >= 9.0 V and <= 17.0 V
ECU no communication (121h)		CAN communication check	Detection of communication error	ECU no communication	CAN bus	Active	max. 5000 ms**
ECU no communication (121h)					ignition Voltage	ON >= 9.0 V and <= 17.0 V
ECU no communication (641h)		CAN communication check	Detection of communication error	ECU no communication	CAN bus	Active	max. 5000 ms**
ECU no communication (641h)					ignition Voltage	ON >= 9.0 V and <= 17.0 V
ECU no communication (391h)		CAN communication check	Detection of communication error	ECU no communication	CAN bus	Active	max. 5000 ms**
ECU no communication (391h)					ignition Voltage	ON >= 9.0 V and <= 17.0 V
Shifter No Communication (0B5h)	U0103 - Lost Communication With Gear Shift Control Module "A"	CAN communication check	Detection of communication error	Shifter no communication	CAN bus	Active	max. 5000 ms**
Shifter No Communication (0B5h)					ignition Voltage	ON >= 9.0 V and <= 17.0 V
Shifter No Communication (12DD54BFh)		CAN communication check	Detection of communication error	Shifter no communication	CAN bus	Active	max. 5000 ms**
Shifter No Communication (12DD54BFh)					ignition Voltage	ON >= 9.0 V and <= 17.0 V
BCM No Communication (3C0h	U0140 - Lost Communication With Body Control Module	CAN communication check	Detection of communication error	BCM no communication	CAN bus	Active	max. 5000 ms**
BCM No Communication (3C0h	U0140 - Lost Communication With Body Control Module				ignition Voltage	ON >= 9.0 V and <= 17.0 V
ECU Message Counter Error (0A7h)	U0401 - Invalid Data Received From ECM/PCM "A"	CAN receive data check	ECU signal data freeze	Data counter not updated	CAN bus ignition Voltage	Active ON >= 9.0 V and <= 17.0 V	max. 5000 ms**
ECU Message Counter Error (0A8h)		CAN receive data check	ECU signal data freeze	Data counter not updated	CAN bus ignition Voltage	Active ON >= 9.0 V and <= 17.0 V	max. 5000 ms**
ECU Message Counter Error (641h)		CAN receive data check	ECU signal data freeze	Data counter not updated	CAN bus ignition Voltage	Active ON >= 9.0 V and <= 17.0 V	max. 5000 ms**
Shifter Message Counter Error (0B5h)	U0404 - Invalid Data Received From Gear Shift Control Module "A"	CAN receive data check	Shifter signal data freeze	Data counter not updated	CAN bus ignition Voltage	Active ON >= 9.0 V and <= 17.0 V	max. 5000 ms**
BCM Message Counter Error (3C0h)	U0422 - Invalid Data Received From Body Control Module	CAN receive data check	BCM signal data freeze	Data counter not updated	CAN bus ignition Voltage	Active ON >= 9.0 V and <= 17.0 V	max. 5000 ms**
ECU Check sum (0A7h)	U0401 - Invalid Data Received From ECM/PCM "A"	CAN receive data check	ECU signal check sum error	Wrong check sum value in a message	CAN bus ignition Voltage	Active ON >= 9.0 V and <= 17.0 V	max. 5000 ms**
ECU Check sum (0A8h)		CAN receive data check	ECU signal check sum error	Wrong check sum value in a message	CAN bus ignition Voltage	Active ON >= 9.0 V and <= 17.0 V	max. 5000 ms**	2 DCY
ECU Check sum (641h)		CAN receive data check	ECU signal check sum error	Wrong check sum value in a message	CAN bus ignition Voltage	Active ON >= 9.0 V and <= 17.0 V	max. 5000 ms**
Shifter Check sum (0B5h)	U0404 - Invalid Data Received From Gear Shift Control Module "A"	CAN receive data check	Shifter signal check sum error	Wrong check sum value in a message	CAN bus ignition Voltage	Active ON >= 9.0 V and <= 17.0 V	max. 5000 ms**
BCM Check sum (3C0h)	U0422 - Invalid Data Received From Body Control Module	CAN receive data check	BCM signal check sum error	Wrong check sum value in a message	CAN bus ignition Voltage	Active ON >= 9.0 V and <= 17.0 V	max. 5000 ms**
Accelerator pedal	U0401 - Invalid Data Received From ECM/PCM "A"	CAN receive data check	Detection of error signal	0xFF	CAN bus ignition Voltage	Active ON >= 9.0 V and <= 17.0 V	250 ms
ECU wrong level	U0301 - Software Incompatibility With ECM/PCM	CAN receive data check	Detection of error signal	Transmission coding is manual transmission code (0Fh) Or Q7: Max torque is not same as one in ATCU Touareg: MO_Code is not same as one in ATCU or MO_Leistung is not same as one in ATCU
Longitudinal G sensor malfunction check	C0062 - Longitudinal Acceleration Sensor	CAN receive data check	Comparison of CAN ax signals to TCU calculated value	1. To calculate signal difference of >11, 3% 2. To receive invalid G sensor Qbit	CAN bus Brake communication ignition	Active Active ON	11.5 km
CAN Shift Lever
Variante CAN invalid failure	U0304 - Software Incompatibility With Gear Shift Control Module "A"	CAN receive data check	Detection of unintentional shifter type information	not 0x000 and not 0x07	CAN bus Shift lever communication ignition Voltage	Active Active ON >= 9.0 V and <= 17.0 V	260 ms	2 DCY
WH_Fahrstufe CAN invalid failur	P085D - Gear Shift Control Module "A" Performance	CAN receive data check	Detection of error signal	0x0F	CAN bus Shift lever communication ignition Voltage	Active Active ON >= 9.0 V and <= 17.0 V	260 ms
WH Fehler Sensor mehrfach CAN invalid failure	P0919 - Gear Shift Position Control Error	CAN receive data check	Detection of error signal	0x01	CAN bus Shift lever communication ignition Voltage	Active Active ON >= 9.0 V and <= 17.0 V	1000 ms 5 times
Shift-by-Wire Actuator Functional
Not-engage of the parking lock (by N.S.S.W)	P07E4 - Unable to Engage Park	Actual position from position switch compared to target position	Actual position from position switch does not show P	Actual position is not P	ignition Voltage Target position Emergency release	ON >= 9.0 V and <= 17.0 V P for 1200 ms off	1500 ms	2 DCY
Not-release of the parking lock (by EP_Position)	P07E6 - Stuck in Park	Actual position from shift-by- wire actuator compared to target position	Actual position from shift-by-wire actuator does not change to other than P	Actual position from CAN signal is P	Target position	not P	1500 ms
Not-release of the parking lock (by N.S.S.W)	P07E6 - Stuck in Park	Actual position from position switch compared to target position	Actual position from position switch does not change to other than P	Actual position from position switch is P	Target position	not P	1500 ms
Wrong Engagement Range (by N.S.S.W)	P288B - Park Lock/Pawl Actuator Circuit Performance	Actual position from shift-by- wire actuator compared to target position	Actual position from position switch does not follow target position R/N/D	Actual position is mismatched against target position	ignition Voltage Target position Actual position from position switch Emergency release	ON >= 9.0 V and <= 17.0V R or N or D not P off	1500 ms
Not-engage of the parking lock (by ABS)	C060E - Left Park Brake Actuator Performance/Stuck Off	Vehicle movement even though parking lock is engaged	Actual position from shift-by-wire actuator shows P, but vehicle is moving/rolling	speed >= 2 kph for 200 ms or distance >= 35 cm	ignition Voltage Target position Actual position from shift-by- wire actuator	ON >= 9.0 V and <= 17.0 V P P	200 ms (for speed) or continuous (for distance)
Functional lock up control
Lock up control	P0741 - Torque Converter Clutch Circuit Performance/Stuck Off	OFF stuck check.	Comparison of engine rpm and input rpm	Engine rpm - input rpm > -100 rpm for 2 s (hybrid only) Engine rpm - input rpm > 100 rpm for 2s	Ignition	ON	2 s 6 times	2 DCY
					Voltage	>= 9.0 V and <= 17.0 V
					Engine speed	> 400 rpm < 4000 rpm
					Shift Lever	D or S
					Time after above shift lever condition	>= 8000 ms
					Estimated engine torque	>= 0 Nm
					Revolution sensor	No back up condition
					SLU target current	>= 1000 mA
					Time after above SLU target current condition	>= Time_SLU_Full
					Common parameter (see footnote)	common condition (see footnote)
Gear ratio error
1st gear	P0731 - Gear 1 Incorrect Ratio	Input and output rpm signal check. Separate error memory for each gear.	Comparison of indicated slip and actual slip with stored values	1. abs (input rev. - output rev. x other gear ratio) < GErev 1 for 500 ms or 2. abs (input rev. - output rev. x expected gear ratio) > GE rev 2 for 1s	Ignition	ON	500 ms or 1 s 5 times cumulative	2 DCY
					Voltage	>= 9.0 V and <= 17.0 V
					Engine speed	> 400 rpm
2nd gear	P0732 - Gear 2 Incorrect Ratio				Output rev.	> 60 rpm
3rd gear	P0733 - Gear 3 Incorrect Ratio				Shift Lever	D or S
4th gear	P0734 - Gear 4 Incorrect Ratio				Revolution sensor	No back up condition
5th gear	P0735 - Gear 5 Incorrect Ratio				Common parameter (see footnote)	common condition (see footnote)
6th gear	P0729 - Gear 6 Incorrect Ratio
7th gear	P076F - Gear 7 Incorrect Ratio
8th gear	P07D9 - Gear 8 Incorrect Ratio
Production Mode
Production Mode active	U1103 - Production Mode Active	Communication check	Activation of a special mode during production process	active	Shift lever Total mileage	Park below threshold value	continuous	2 DCY