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DCDC Converter Control Module (DCDC) --, 2024 MY

WARNING: This page is about a different car, the 2024 Audi S6 and 2024 Audi A6 Quattro. However, it is still accessible from the selected car via links, so may be relevant.
Monitor / System DTC / DTC Description Monitor Strategy Description Malfunction Criteria Threshold Value Secondary Parameters Enable Condition Monitoring Time Length MIL Illum.
Micro controller supply Voltage Sensor U_Terminal 30 P0A08 - DC/DC Converter Status Circuit Short to ground Measured voltage < 1.0 [V] Terminal 30 ON   100 ms continuous Immediately
Out of range low Measured voltage < 3.0 [V] Terminal 30 ON   100 ms continuous Immediately
Out of range high Measured voltage > 32.0 [V] Terminal 30 ON   100 ms continuous Immediately
P0A94 - DC/DC Converter "A" Performance Rationality low : Plausible check with other sensor measurement US1_1 Input voltage difference between measurements at main micro controller and safety micro controller < -1.0 [V] Safety switch S1 Functional Safety (FUSI) Closed Enabled   100 ms continuous 2 DCY
Rationality high : Plausible check with other sensor measurement US1_1 Input voltage difference between measurements at main micro controller and safety micro controller > 1.0 [V] Safety switch S1 Functional Safety (FUSI) Closed Enabled   100 ms continuous 2 DCY
48V supply Voltage Sensor U_Terminal 40 Short to ground Measured voltage < 1.0 [V] Safety switch S1 Functional Safety (FUSI) Closed Enabled   100 ms continuous 2 DCY
Out of range low Measured voltage < 3.0 [V] Safety switch S1 Functional Safety (FUSI) Closed Enabled   100 ms continuous 2 DCY
Out of range high Measured voltage > 63.0 [V] Terminal 30 ON   100 ms continuous 2 DCY
Other rationality : Plausible check with modelled value Differential voltage between measured and modelled value < -30 > 30 [V] [V] I_Terminal 30 Terminal 30_Voltage ≥ 8 > 9 [A] [V] 100 ms continuous 2 DCY
Safety switch 1_1 input supply Voltage Sensor U_Safety switch1_1 Short to ground Measured voltage < 1.0 [V] Safety switch S1 Functional Safety (FUSI) Closed Enabled   100 ms continuous 2 DCY
Out of range low Measured voltage < 3.0 [V] Safety switch S1 Functional Safety (FUSI) Closed Enabled   100 ms continuous 2 DCY
Out of range high Measured voltage > 32.0 [V] Terminal 30 ON   100 ms continuous 2 DCY
Rationality low : Plausible check with other sensor measurement US1_2 Input voltage difference between measurements at Safety switch S1_1 and Safety switch S1_2 < -1.0 [V] Terminal 30 ON   100 ms continuous 2 DCY
Rationality high : Plausible check with other sensor measurement US1_2 Input voltage difference between measurements at Safety switch S1_1 and Safety switch S1_2 > 1.0 [V] Terminal 30 ON   100 ms continuous 2 DCY
Safety switch1_2 input supply Voltage Sensor U_Safety switch1_2 Short to ground Measured voltage < 1.0 [V] Safety switch S1 Functional Safety (FUSI) Closed Enabled   100 ms continuous 2 DCY
Out of range low Measured voltage < 3.0 [V] Safety switch S1 Functional Safety (FUSI) Closed Enabled   100 ms continuous 2 DCY
Out of range high Measured voltage > 32.0 [V] Terminal 30 ON   100 ms continuous 2 DCY
Rationality low : Plausible check with other sensor measurement US1_3 Input voltage difference between measurements at Safety switch S1_2 and Safety switch S1_3 < -1.0 [V] Terminal 30 ON   100 ms continuous 2 DCY
Rationality high : Plausible check with other sensor measurement US1_3 Input voltage difference between measurements at Safety switch S1_2 and Safety switch S1_3 > 1.0 [V] Terminal 30 ON   100 ms continuous 2 DCY
Safety switch1_3 input supply Voltage Sensor U_Safety switch1_3 Short to ground Measured voltage < 1.0 [V] Safety switch S1 Functional Safety (FUSI) Closed Enabled   100 ms continuous 2 DCY
Out of range low Measured voltage < 3.0 [V] Safety switch S1 Functional Safety (FUSI) Closed Enabled   100 ms continuous 2 DCY
Out of range high Measured voltage > 32.0 [V] Terminal 30 ON   100 ms continuous 2 DCY
Rationality low : Plausible check with other sensor measurement US1_4 Input voltage difference between measurements at Safety switch S1_3 and Safety switch S1_4 < -1.0 [V] Terminal 30 ON   100 ms continuous 2 DCY
Rationality high : Plausible check with other sensor measurement US1_4 Input voltage difference between measurements at Safety switch S1_3 and Safety switch S1_4 > 1.0 [V] Terminal 30 ON   100 ms continuous 2 DCY
Safety switch1_4 input supply Voltage Sensor U_Safety switch1_4 Short to ground Measured voltage < 1.0 [V] Safety switch S1 Functional Safety (FUSI) Closed Enabled   100 ms continuous 2 DCY
Out of range low Measured voltage < 3.0 [V] Safety switch S1 Functional Safety (FUSI) Closed Enabled   100 ms continuous 2 DCY
Out of range high Measured voltage > 32.0 [V] Terminal 30 ON   100 ms continuous 2 DCY
Rationality low : Plausible check with other sensor measurement US1_1 Input voltage difference between measurements at Safety switch S1_4 and Safety switch S1_1 < -1.0 [V] Terminal 30 ON   100 ms continuous 2 DCY
Rationality high : Plausible check with other sensor measurement US1_1 Input voltage difference between measurements at Safety switch S1_4 and Safety switch S1_1 > 1.0 [V] Terminal 30 ON   100 ms continuous 2 DCY
11V actuator supply check Voltage Sensor - main uC P0A08 - DC/DC Converter Status Circuit Rationality check : Verification with limit values Measured voltage ≤ 10.5 ≥ 15.0 [V] U_Terminal 30 > 4.5 [V] 100 ms continuous Immediately
11V actuator supply check Voltage Sensor - Safety uC Rationality check : Verification with limit values Measured voltage ≤ 10.5 ≥ 15.0 [V] Safety controller communication U_Terminal 30 ON > 4.5 [-] [V] 100 ms continuous Immediately
Capacitor input voltage U_PUMP_S1 Rationality check : Plausibility check with other sensor measurement Difference between measurements at capacitor and main micro controller Terminal_30 ≤ 8.0 ≥15.0 [V] [V] U_Terminal 30 ≤ U_Pump_S 1 (and) > 4.5 [V] [V] 100 ms continuous Immediately
Short to ground Measured voltage < 1.0 [V] Safety controller communication Active   100 ms continuous Immediately
Out of range low Measured voltage < 3.0 [V] Safety controller communication Active   100 ms continuous Immediately
Out of range high Measured voltage > 32.0 [V] Safety controller communication Active   100 ms continuous Immediately
Safety Microcontroller supply Voltage Sensor US1_safety_uC P0A94 - DC/DC Converter "A" Performance Rationality low : Plausible check with other sensor measurement US1_1 Input voltage difference between measurements at Safety micro controller and Safety switch S1_1 < -1.0 [V] Safety switch S1 Safety controller communication Closed Active   100 ms continuous 2 DCY
Rationality high : Plausible check with other sensor measurement US1_1 Input voltage difference between measurements at Safety micro controller and Safety switch S1_1 > 1.0 [V] Safety switch S1 Safety controller communication Closed Active   100 ms continuous 2 DCY
Temperature Sensor absolute value t1°C converted value t1 digits P0A08 - DC/DC Converter Status Circuit Other Rationality - Erratic intermittent contact check by temperature rate of change Calculated rate of change of measured temperature t1 with time > 2.0 [°C / s] Terminal 30 ON   100 ms continuous Immediately
Out of range low Measured temperature < 200 [Digit s] Terminal 30 ON   100 ms continuous Immediately
Out of range high Measured temperature > 4090 [Digit s] Terminal 30 ON   100 ms continuous Immediately
P0A94 - DC/DC Converter "A" Performance Rationality low : Plausible check with other sensor measurement Temperature difference between measurements at sensor t1 and t2 < -400 [Digit s] Terminal 30 ON   100 ms continuous 2 DCY
Rationality high : Plausible check with other sensor measurement Temperature difference between measurements at sensor t1 and t2 >400 [Digit s] Terminal 30 ON   100 ms continuous 2 DCY
Temperature Sensor absolute value t2°C converted value t2 digits P0A08 - DC/DC Converter Status Circuit Other Rationality - Erratic intermittent contact check using rate of change temperature Calculated rate of change of temperature measurement t2 with time > 2.0 [°C / s] Terminal 30 ON   100 ms continuous Immediately
Out of range low Measured temperature < 200 [Digit s] Terminal 30 ON   100 ms continuous Immediately
Out of range high Measured temperature > 4090 [Digit s] Terminal 30 ON   100 ms continuous Immediately
P0A94 - DC/DC Converter "A" Performance Rationality low : Plausible check with other sensor measurement Temperature difference between measurements at sensor t2 and t3 < -400 [Digit s] Terminal 30 ON   100 ms continuous 2 DCY
Rationaility high : Plausible check with other sensor measurement Temperature difference between measurements at sensor t2 and t3 >400 [Digit s] Terminal 30 ON   100 ms continuous 2 DCY
Temperature Sensor absolute value t3°C converted value t3 digits P0A08 - DC/DC Converter Status Circuit Other Rationality - Erratic intermittent contact check using rate of change temperature Calculated rate of change of temperature measurement t3 with time > 2.0 [°C / s] Terminal 30 ON   100 ms continuous Immediately
Out of range low Measured temperature < 200 [Digit s] Terminal 30 ON   100 ms continuous Immediately
Out of range high Measured temperature > 4090 [Digit s] Terminal 30 ON   100 ms continuous Immediately
P0A94 - DC/DC Converter "A" Performance Rationality low : Plausible check with other sensor measurement Temperature difference between measurements at sensor t3 and t4 < -400 [Digit s] Terminal 30 ON   100 ms continuous 2 DCY
Rationality high : Plausible check with other sensor measurement Temperature difference between measurements at sensor t3 and t4 >400 [Digit s] Terminal 30 ON   100 ms continuous 2 DCY
Temperature Sensor absolute value t4°C converted value t4 digits P0A08 - DC/DC Converter Status Circuit Other Rationality - Erratic intermittent contact check using rate of change temperature Calculated rate of change of temperature measurement t4 with time > 2.0 [°C / s] Terminal 30 ON   100 ms continuous Immediately
Out of range low Measured temperature < 200 [Digit s] Terminal 30 ON   100 ms continuous Immediately
Out of range high Measured temperature > 4090 [Digit s] Terminal 30 ON   100 ms continuous Immediately
P0A94 - DC/DC Converter "A" Performance Rationality low : Plausible check with other sensor measurement Temperature difference between measurements at sensor t4 and t1 < -400 [Digit s] Terminal 30 ON   100 ms continuous 2 DCY
Rationality high : Plausible check with other sensor measurement Temperature difference between measurements at sensor t4 and t1 >400 [Digit s] Terminal 30 ON   100 ms continuous 2 DCY
Current Sensor Phase_1 Iph.1 P0A08 - DC/DC Converter Status Circuit Short to ground Measured Current_Phase 1 < -44 [A] Terminal 30 ON   100 ms continuous Immediately
Short to battery Measured Current_Phase 1 > 47.5 [A] Terminal 30 ON   100 ms continuous Immediately
Out of range low Measured Current_Phase 1 < -41 [A] Terminal 30 ON   100 ms continuous Immediately
Out of range high Measured Current_Phase 1 > 44.5 [A] Terminal 30 ON   100 ms continuous Immediately
Rationality low : Plausible check with other sensor measurement Iph.2 Current difference between measurements at phase 1 and 2 < -2.5 [A] Terminal 30 ON   100 ms continuous Immediately
Rationality high : Plausible check with other sensor measurement Iph.2 Current difference between measurements at phase 1 and 2 > 2.5 [A] Terminal 30 ON   100 ms continuous Immediately
Current Sensor Phase_2 Iph.2 Short to ground Measured Current_Phase 2 < -44 [A] Terminal 30 ON   100 ms continuous Immediately
Short to battery Measured Current_Phase 2 > 47.5 [A] Terminal 30 ON   100 ms continuous Immediately
Out of range low Measured Current_Phase 2 < -41 [A] Terminal 30 ON   100 ms continuous Immediately
Out of range high Measured Current_Phase 2 > 44.5 [A] Terminal 30 ON   100 ms continuous Immediately
Rationality low : Plausible check with other sensor measurement Iph.3 Current difference between measurements at phase 2 and 3 < -2.5 [A] Terminal 30 ON   100 ms continuous Immediately
Rationality high : Plausible check with other sensor measurement Iph.3 Current difference between measurements at > 2.5 [A] Terminal 30 ON   100 ms continuous Immediately
Current Sensor Phase_3 Iph.3 Short to ground Measured Current_Phase 3 < -44 [A] Terminal 30 ON   100 ms continuous Immediately
Short to battery Measured Current_Phase 3 > 47.5 [A] Terminal 30 ON   100 ms continuous Immediately
Out of range low Measured Current_Phase 3 < -41 [A] Terminal 30 ON   100 ms continuous Immediately
Out of range high Measured Current_Phase 3 > 44.5 [A] Terminal 30 ON   100 ms continuous Immediately
Rationality low : Plausible check with other sensor measurement Iph.4 Current difference between measurements at < -2.5 [A] Terminal 30 ON   100 ms continuous Immediately
Rationality high : Plausible check with other sensor measurement Iph.4 Current difference between measurements at > 2.5 [A] Terminal 30 ON   100 ms continuous Immediately
Current Sensor Phase_4 Iph.4 Short to ground Measured Current_Phase 4 < -44 [A] Terminal 30 ON   100 ms continuous Immediately
Short to battery Measured Current_Phase 4 > 47.5 [A] Terminal 30 ON   100 ms continuous Immediately
Out of range low Measured Current_Phase 4 < -41 [A] Terminal 30 ON   100 ms continuous Immediately
Out of range high Measured Current_Phase 4 > 44.5 [A] Terminal 30 ON   100 ms continuous Immediately
Rationality low : Plausible check with other sensor measurement Iph.5 Current difference between measurements at phase 4 and 5 < -2.5 [A] Terminal 30 ON   100 ms continuous Immediately
Rationality high : Plausible check with other sensor measurement Iph.5 Current difference between measurements at phase 4 and 5 > 2.5 [A] Terminal 30 ON   100 ms continuous Immediately
Current Sensor Phase_5 Iph.5 Short to ground Measured Current_Phase 5 < -44 [A] Terminal 30 ON   100 ms continuous Immediately
Short to battery Measured Current_Phase 5 > 47.5 [A] Terminal 30 ON   100 ms continuous Immediately
Out of range low Measured Current_Phase 5 < -41 [A] Terminal 30 ON   100 ms continuous Immediately
Out of range high Measured Current_Phase 5 > 44.5 [A] Terminal 30 ON   100 ms continuous Immediately
Rationality low : Plausible check with other sensor measurement Iph.6 Current difference between measurements at phase 5 and 6 < -2.5 [A] Terminal 30 ON   100 ms continuous Immediately
Rationality high : Plausible check with other sensor measurement Iph.6 Current difference between measurements at phase 5 and 6 > 2.5 [A] Terminal 30 ON   100 ms continuous Immediately
Current Sensor Phase_6 Iph.6 Short to ground Measured Current_Phase 6 < -44 [A] Terminal 30 ON   100 ms continuous Immediately
Short to battery Measured Current_Phase 6 > 47.5 [A] Terminal 30 ON   100 ms continuous Immediately
Out of range low Measured Current_Phase 6 < -41 [A] Terminal 30 ON   100 ms continuous Immediately
Out of range high Measured Current_Phase 6 > 44.5 [A] Terminal 30 ON   100 ms continuous Immediately
Rationality low : Plausible check with other sensor measurement Iph.7 Current difference between measurements at phase 6 and 7 < -2.5 [A] Terminal 30 ON   100 ms continuous Immediately
Rationality high : Plausible check with other sensor measurement Iph.7 Current difference between measurements at phase 6 and 7 > 2.5 [A] Terminal 30 ON   100 ms continuous Immediately
Current Sensor Phase_7 Iph.7 Short to ground Measured Current_Phase 7 < -44 [A] Terminal 30 ON   100 ms continuous Immediately
Short to battery Measured Current_Phase 7 > 47.5 [A] Terminal 30 ON   100 ms continuous Immediately
Out of range low Measured Current_Phase 7 < -41 [A] Terminal 30 ON   100 ms continuous Immediately
Out of range high Measured Current_Phase 7 > 44.5 [A] Terminal 30 ON   100 ms continuous Immediately
Rationality low : Plausible check with other sensor measurement Iph.8 Current difference between measurements at phase 7 and 8 < -2.5 [A] Terminal 30 ON   100 ms continuous Immediately
Rationality high : Plausible check with other sensor measurement Iph.8 Current difference between measurements at phase 7 and 8 > 2.5 [A] Terminal 30 ON   100 ms continuous Immediately
Current Sensor Phase_8 Iph.8 Short to ground Measured Current_Phase 8 < -44 [A] Terminal 30 ON   100 ms continuous Immediately
Short to battery Measured Current_Phase 8 > 47.5 [A] Terminal 30 ON   100 ms continuous Immediately
Out of range low Measured Current_Phase 8 < -41 [A] Terminal 30 ON   100 ms continuous Immediately
Out of range high Measured Current_Phase 8 > 44.5 [A] Terminal 30 ON   100 ms continuous Immediately
Rationality low : Plausible check with other sensor measurement Iph.1 Current difference between measurements at phase 8 and 1 < -2.5 [A] Terminal 30 ON   100 ms continuous Immediately
Rationality high : Plausible check with other sensor measurement Iph.1 Current difference between measurements at phase 8 and 1 > 2.5 [A] Terminal 30 ON   100 ms continuous Immediately
Fan Current Sensor I_fan P0A94 - DC/DC Converter "A" Performance Short to ground Measured Current at Fan terminal < 0.015 [A] Fan duty cycle ≥ 60 [%] 100 ms continuous 2 DCY
Short to battery Measured Current at Fan terminal > 1.1 [A] Fan duty cycle ≥ 60 [%] 100 ms continuous 2 DCY
Out of range low Measured Current at Fan terminal < 0.03 [A] Fan duty cycle ≥ 60 [%] 100 ms continuous 2 DCY
Out of range high Measured Current at Fan terminal > 1.0 [A] Fan duty cycle ≥ 60 [%] 100 ms continuous 2 DCY
Rationality low : Plausible check with duty cycle (x) based limit value (y) Measured Current at Fan terminal is evaluated with limit value see sheet fan compensation [mA] Fan duty cycle ≥ 60 [%] 100 ms continuous 2 DCY
Rationality high : Plausible check with duty cycle (x) based limit value (y) Measured Current at Fan terminal is evaluated with limit value see sheet fan compensation [mA] Fan duty cycle ≥ 60 [%] 100 ms continuous 2 DCY
FAN actuator functional check FAN open circuit / not plugged in to circuit Measured current at Fan terminal < 0.015 [A] Terminal 30 ON   100 ms continuous 2 DCY
FAN overload failure Measured current at Fan terminal > 1.2 [A] Terminal 30 ON   100 ms continuous 2 DCY
FAN Blocked condition check by comparing fan terminal current measurement with duty cycle (x) based limit value (y) Calculated fan speed based on current measurement is lower than limit value see sheet fan compensation [1/mi n] Fan duty cycle ≥ 60 [%] 100 ms continuous 2 DCY
FAN Broken condition check by comparing fan terminal current measurement with duty cycle (x) based limit value (y) Calculated fan speed based on current measurement is higher than limit value see sheet fan compensation [1/mi n] Fan duty cycle ≥ 60 [%] 100 ms continuous 2 DCY
Overall System Performance Check P0D32 - DC/DC Converter "A" Over Temperature Measured temperature from all 4 sensors Maximum temperature out of all sensor measurements > 85 [°C] Terminal 30 ON   100 ms continuous Immediately
P0A94 - DC/DC Converter "A" Performance Conversion efficiency out of limit Ratio of output power to input power is conversion efficiency. The calculated value is compared with input current (x) based high and low efficiency limit values (y). The input current x is the sum of all 8 current sensor measurements High limit y = +100.1082915x0 -0.005853603x1 -4.57111e-5x2 +1.18206e-7x3 +1.12654e-11x4 ymax =100 Low limit = +78.50336709x0 +0.831397432x1 -0.020975461x2 +0.000268758x3 -1.89771e-6x4 +7.37869e-9x4 -1.47418e-11x5 +1.1789e-14x6 y min =84 [%] I_Terminal 30 U_Terminal 30 DCDC output power ≥ 8 > 9 ≥ 100 [A] [V] [W] 100 ms continuous 2 DCY
P0CA3 - DC/DC Converter Step Up Voltage Performance Terminal 40_Under voltage with shut off detected Measured voltage Terminal 40 < 17 [V] Terminal 40 Precharge ON Completed   100 ms continuous 2 DCY
P0A08 - DC/DC Converter Status Circuit Check if DCDC is non functional in safe state due to Functional Safety Monitor                
U031B - Software Incompatibility With DC/DC Converter Control Module "A" Functional check of applicable OBD software configuration CAN Signal Data set variable : OBD Mode = US_OBD = 1 [-] Terminal 30 OBD_Config_Check ON Possible   100 ms continuous 2 DCY
Micro controller Internal Error P0A08 - DC/DC Converter Status Circuit RAM monitor Number of internal RAM errors > 10 [-] Terminal 30 ON   100 ms continuous Immediately
ROM monitor Number of internal ROM errors > 5 [-] Terminal 30 ON   100 ms continuous Immediately
NVM Monitor Stored and calculated checksum NOT MATCHING [-] Initialization ON   Only during initialization Immediately
WD monitor Number of consecutive WD resets > 5 [-] Initialization ON   Only during initialization Immediately
CAN_RAM monitor Internal error detected at CAN RAM portion TRUE [-] Initialization ON   Only during initialization Immediately
CAN Communication failures U014A - Lost Communication With Battery Energy Control Module "C" Time out check BMS_MV_01 BMS_MV_04 > 0.5 >5 s H_CAN_diagnostics Enabled   100 ms continuous 2 DCY
U0100 - Lost Communication With ECM/PCM "A" Time out check Motor_Code_01 Motor_07 Motor_28 >5 >5 >2 s H_CAN_diagnostics Enabled   100 ms continuous 2 DCY
U0146 - Lost Communication With Serial Data Gateway Module "A" Time out check MVK_01 Klemmen_Status_01 Systeminfo_01 0.5 1.0 5.0 s H_CAN_diagnostics Enabled   100 ms continuous 2 DCY
U014A - Lost Communication With Battery Energy Control Module "C" Invalid value BMS_MV_IstSpannung MV_On BMS_MV_IstModus BMS_MV_IstSpannung MV_On BMS_MVIstModus ERROR ERROR ERROR Init Init Init [-] H_CAN_diagnostics Enabled   100 ms continuous 2 DCY
U0146 - Lost Communication With Serial Data Gateway Module "A" Invalid value MVK_DCDC_Sollmodus_02 ERROR [-] H_CAN_diagnostics Enabled   100 ms continuous 2 DCY
Global time out check no received message observed TIME OUT [-]       100 ms continuous 2 DCY
Bus Off at HCAN   ERROR [-]          
Safety micro controller internal failure P0A08 - DC/DC Converter Status Circuit Safety Controller software version mismatch Communication from safety micro controller Software ID matches with stored values Enabled Not matching [-] Initialization ON   Only during initialization Immediately
Safety controller not working Safety controller communication request Not answered [-] Initialization ON   100 ms continuous Immediately
DCDC Converter control loop monitor Failure occurrence frequency Number of failure occurrences Time window > 5 > 10 [numbers] [minutes] Initialization ON   100 ms continuous Immediately
Precharge function monitor P0A94 - DC/DC Converter "A" Performance Terminal 40_Precharge rationality Voltage difference between target and measured voltage time since precharge start as percentage of target ramp time > 3 > 170 [V] [%] of time Precharge and DCDC_FSM_Precharge_Boost_ Ramp_Active Enabled Enabled   Only during precharge 2 DCY
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