P0556 · Manufacturer communications

RAM · 2026-07-22

Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle exhibit/set SYMPTOM: one or more of the following Diagnostic Trouble Codes (DTCs): ● P0420 - Catalyst System Efficiency Below Threshold Bank 1. ● P0430 - Catalyst System Efficiency Below Threshold Bank 2. ● P0556 - Brake Booster Pressure Sensor Circuit Performance. ● P0340 - Cam Position Sensor Circuit - Bank 1 Intake. ● P0345 - Cam Position Sensor Circuit - Bank 2 Intake. ● P0365 - Cam Position Sensor Circuit - Bank 1 Exhaust. ● P0390 - Cam Position Sensor Circuit - Bank 2 Exhaust. Customers may experience one or more of the following: ● Vehicle fails emissions inspection testing. ● Fuel odor during frequent stop and re-start driving, during high…

AUDI · 2026-02-04

This bulletin provides information when the MIL is on; DTC P258B00 or P055600.

AUDI · 2023-12-13

This bulletin provides information for when the MIL Is illuminated; DTC P258B00 or P055600.

RAM · 2022-05-26

Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find that one or more of the following DTCs have been set: P0556 - Brake Booster Pressure Sensor Circuit Performance. P0340 - Cam Position Sensor Circuit - Bank 1 Intake. P0345 - Cam Position Sensor Circuit - Bank 2 Intake. P0365 - Cam Position Sensor Circuit - Bank 1 Exhaust. P0390 - Cam Position Sensor Circuit - Bank 2 Exhaust. Customer may describe the following:Fuel odor during frequent stop and re-start driving, during high ambient temps. The following software enhancements are also available: OBD calibration turned off DTC U0463 - Fuel…

RAM · 2022-05-25

Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find the following Diagnostic Trouble Code (DTC) has been set:P0556 - Brake Booster Pressure Sensor Circuit Performance. Customer may describe the following:Fuel odor during frequent stop and re-start driving, during high ambient temps.

RAM · 2022-05-19

Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find the following Diagnostic Trouble Code (DTC) have been set: P0556 - Brake Booster Pressure Sensor Circuit Performance. Customer may describe the following: Fuel odor during frequent stop and re-start driving, during high ambient temps.

RAM · 2022-05-17

Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find the following Diagnostic Trouble Code (DTC) has been set: P0556 - Brake Booster Pressure Sensor Circuit Performance.

VOLKSWAGEN · 2021-01-14

Customer states MIL-on with P0556 Customer states MIL-on with P2421 Customer states MIL-on with Misfire code Customer states clutch pedal makes noise No crank, no start Customer states no voice output during calls / micro phone inoperative Customer states fuel odor/leak in the rear part of the vehicle (without a punctured fuel tank, hoses or pipes) or difficulty fueling fuel tank or fuel coming back up filler neck

VOLKSWAGEN · 2021-01-04

Customer states MIL-on with P0556 Customer states MIL-on with P2421 Customer states MIL-on with Misfire code Customer states clutch pedal makes noise No crank, no start Customer states no voice output during calls / micro phone inoperative Customer states fuel odor/leak in the rear part of the vehicle (without a punctured fuel tank, hoses or pipes) or difficulty fueling fuel tank or fuel coming back up filler neck

VOLKSWAGEN · 2020-12-10

Customer states MIL-on with P0556 Customer states MIL-on with P2421 Customer states MIL-on with Misfire code Customer states clutch pedal makes noise No crank, no start Customer states no voice output during calls / micro phone inoperative Customer states seat memory inoperative Customer states fuel odor/leak in the rear part of the vehicle (without a punctured fuel tank, hoses or pipes) or difficulty fueling fuel tank or fuel coming back up filler neck

VOLKSWAGEN · 2020-12-01

Customer states MIL-on with P0556 Customer states MIL-on with P2421 Customer states MIL-on with Misfire code Customer states clutch pedal makes noise No crank, no start Customer states seat memory inoperative Customer states fuel odor/leak in the rear part of the vehicle (without a punctured fuel tank, hoses or pipes) or difficulty fueling fuel tank or fuel coming back up filler neck

VOLKSWAGEN · 2020-11-20

Customer states MIL-on with P0556 "Customer states MIL-on with P11A1/P11A2/P11A3/P11A4/P11A5/P11A6/P11A7/P11A8/ P11A9/P11AA/P11AB/P11AC/P11AD/P11AE/P11AF/P11B0" Customer states MIL-on with P2421 Customer states MIL-on, HPFP mounting bolts loose/broken Customer states MIL-on with Misfire code Customer states clutch pedal makes noise No crank, no start Customer states seat memory inoperative Customer states fuel odor/leak in the rear part of the vehicle (without a punctured fuel tank, hoses or pipes) or difficulty fueling fuel tank or fuel coming back up filler neck

VOLKSWAGEN · 2020-11-12

Customer states MIL-on with P0556 "Customer states MIL-on with P11A1/P11A2/P11A3/P11A4/P11A5/P11A6/P11A7/P11A8/ P11A9/P11AA/P11AB/P11AC/P11AD/P11AE/P11AF/P11B0" Customer states MIL-on with P0463 P2068 Customer states MIL-on, HPFP mounting bolts loose/broken Customer states MIL-on with Misfire code Customer states clutch pedal makes noise No crank, no start Customer states seat memory inoperative Customer states fuel odor/leak in the rear part of the vehicle (without a punctured fuel tank, hoses or pipes) or difficulty fueling fuel tank or fuel coming back up filler neck

VOLKSWAGEN · 2020-10-21

Customer states MIL-on with P0556 "Customer states MIL-on with P11A1/P11A2/P11A3/P11A4/P11A5/P11A6/P11A7/P11A8/ P11A9/P11AA/P11AB/P11AC/P11AD/P11AE/P11AF/P11B0" Customer states rattle noise from under vehicle Customer states MIL-on with P0463 P2068 Customer states MIL-on, HPFP mounting bolts loose/broken Customer states MIL-on with Misfire code Customer states clutch pedal makes noise No crank, no start Customer states seat memory inoperative

VOLKSWAGEN · 2020-10-19

Customer states oil leak from the engine Customer states MIL-on with P0556 "Customer states MIL-on with P11A1/P11A2/P11A3/P11A4/P11A5/P11A6/P11A7/P11A8/ P11A9/P11AA/P11AB/P11AC/P11AD/P11AE/P11AF/P11B0" Customer states rattle noise from under vehicle Customer states MIL-on with P0463 P2068 Customer states MIL-on, HPFP mounting bolts loose/broken Customer states clutch pedal makes noise No crank, no start Customer states seat memory inoperative

VOLKSWAGEN · 2020-10-14

Customer states oil leak from the engine Customer states MIL-on with P0556 "Customer states MIL-on with P11A1/P11A2/P11A3/P11A4/P11A5/P11A6/P11A7/P11A8/ P11A9/P11AA/P11AB/P11AC/P11AD/P11AE/P11AF/P11B0" Customer states rattle noise from under vehicle Customer states MIL-on with P0463 P2068 Customer states MIL-on, HPFP mounting bolts loose/broken Customer states clutch pedal makes noise No crank, no start Customer states seat memory inoperative Customer states both headlights are cracked

VOLKSWAGEN · 2020-10-01

Customer states oil leak from the engine Customer states MIL-on with P0556 MIL-on P04F0 and/or P0441 Customer states MIL-on with P0111 "Customer states MIL-on with P11A1/P11A2/P11A3/P11A4/P11A5/P11A6/P11A7/P11A8/ P11A9/P11AA/P11AB/P11AC/P11AD/P11AE/P11AF/P11B0" Customer states rattle noise from under vehicle Customer states MIL-on with P0463 P2068 Customer states MIL-on, HPFP mounting bolts loose/broken Customer states clutch pedal makes noise No crank, no start Customer states both headlights are cracked

VOLKSWAGEN · 2020-09-21

Customer states oil leak from the engine Customer states MIL-on with P0556 MIL-on P04F0 and/or P0441 Customer states oil leak from the engine Customer states MIL-on with P0111 "Customer states MIL-on with P11A1/P11A2/P11A3/P11A4/P11A5/P11A6/P11A7/P11A8/ P11A9/P11AA/P11AB/P11AC/P11AD/P11AE/P11AF/P11B0" Customer states rattle noise from under vehicle Customer states MIL-on with P0463 P2068 Customer states MIL-on, HPFP mounting bolts loose/broken Customer states clutch pedal makes noise No crank, no start Customer states both headlights are cracked

VOLKSWAGEN · 2020-09-16

Customer states MIL-on with P0496 Customer states oil leak from the engine Customer states MIL-on with P0556 MIL-on P04F0 and/or P0441 Customer states oil leak from the engine Customer states MIL-on with P0111 "Customer states MIL-on with P11A1/P11A2/P11A3/P11A4/P11A5/P11A6/P11A7/P11A8/ P11A9/P11AA/P11AB/P11AC/P11AD/P11AE/P11AF/P11B0" Customer states rattle noise from under vehicle Customer states MIL-on with P0463 P2068 Customer states MIL-on, HPFP mounting bolts loose/broken Customer states clutch pedal makes noise No crank, no start Customer states both headlights are cracked

JEEP · 2020-08-25

Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the Powertrain Control Module (PCM) with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find that one of the following DTCs have been set:P1D83 - Implausible Engine Oil Temperature Signal Received. P0556 - Brake Booster Pressure Sensor Circuit Performance. U0428 - Implausible Data Received From Steering Angle Sensor Module. U1504 - Implausible Message Data Length Received From Steering Angle Sensor. C0501 - Left Front Wheel Speed Sensor Range/Performance. C0507 - Right Front Wheel Speed Sensor Range/Performance. C050D - Left Rear Wheel Speed Sensor Range/Performance. C0513 - Right Rear Wheel Speed Sensor…

JEEP · 2020-08-25

Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the Powertrain Control Module (PCM) with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find that one of the following DTCs have been set:P1D83 - Implausible Engine Oil Temperature Signal Received. P0556 - Brake Booster Pressure Sensor Circuit Performance. U0428 - Implausible Data Received From Steering Angle Sensor Module. U1504 - Implausible Message Data Length Received From Steering Angle Sensor. C0501 - Left Front Wheel Speed Sensor Range/Performance. C0507 - Right Front Wheel Speed Sensor Range/Performance. C050D - Left Rear Wheel Speed Sensor Range/Performance. C0513 - Right Rear Wheel Speed Sensor…

DODGE, JEEP · 2020-05-27

Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more of the following DTCs have been set:P06EF - Engine Restart Performance(3.0L and 3.6L Only). P0556 - Brake Booster Pressure Sensor Circuit Performance. P040B - Exhaust Gas Recirculation Temperature Sensor 1 Circuit Performance(3.6L Only). U1424 - Implausible Engine Torque Signal Received(2017 MY Only). P2681 - Engine Coolant Bypass Valve Control Circuit Open(3.6L Only). P2299 - Brake Pedal Position/Accelerator Pedal Position Incompatible. B23C3 - Stop/Start Disable Switch 1/2 Correlation(3.0L and 3.6L Only). The following DTCs…

VOLKSWAGEN · 2019-11-22

Customer states MIL-on with P1429 and/or P0556 Customer states MIL-on with P0133 Customer states MIL-on, HPFP mounting bolts loose/broken Customer states front window(s) noisy during operation Customer states side mirror glass is cracked or has wind noise from housing Customer states the parking brake will not disengage or parking brake error/warning light in MFI faults C100C01, C100C07, C100C29 in the ABS module No crank, no start Customer states radio reads "Outside of operating temperature range. Switching Infotainment system off" Customer states the airbag light is on

VOLKSWAGEN · 2019-11-18

Customer states MIL-on with P1429 and/or P0556 Customer states MIL-on with P0133 Customer states MIL-on, HPFP mounting bolts loose/broken Customer states front window(s) noisy during operation Customer states side mirror glass is cracked or has wind noise from housing Customer states the parking brake will not disengage or parking brake error/warning light in MFI faults C100C01, C100C07, C100C29 in the ABS module Customer states radio reads "Outside of operating temperature range. Switching Infotainment system off" Customer states the airbag light is on

VOLKSWAGEN · 2019-11-06

Customer states MIL-on with P1429 and/or P0556 Customer states MIL-on with P0133 Customer states MIL-on, HPFP mounting bolts loose/broken Customer states MIL-on P0496 Customer states front window(s) noisy during operation Customer states side mirror glass is cracked or has wind noise from housing Customer states the parking brake will not disengage or parking brake error/warning light in MFI faults C100C01, C100C07, C100C29 in the ABS odule Customer states radio reads "Outside of operating temperature range. Switching Infotainment system off" Customer states the airbag light is on

VOLKSWAGEN · 2019-11-04

Customer states MIL-on with P1429 and/or P0556 Customer states MIL-on with P0133 Customer states MIL-on, HPFP mounting bolts loose/broken Customer states MIL-on P0496 Customer states front window(s) noisy during operation A/C compressor leaking Customer states side mirror glass is cracked or has wind noise from housing Customer states the rear lift gate has rust or corrosion Customer states the parking brake will not disengage or parking brake error/warning light in MFI faults C100C01, C100C07, C100C29 in the ABS module Customer states MIL-on U019900 and/or U020000 in the ECM) Customer states the airbag light is on

VOLKSWAGEN · 2019-10-31

Customer states MIL-on with P1429 and/or P0556 Customer states MIL-on with P0133 Customer states MIL-on, HPFP mounting bolts loose/broken Customer states front window(s) noisy during operation A/C compressor leaking Customer states the rear lift gate has rust or corrosion Customer states the parking brake will not disengage or parking brake error/warning light in MFI faults C100C01, C100C07, C100C29 in the ABS module Customer states MIL-on U019900 and/or U020000 in the ECM) Customer states the airbag light is on

VOLKSWAGEN · 2019-10-28

Customer states MIL-on with P1429 and/or P0556 Customer states MIL-on with P0133 Customer states MIL-on with P050A Customer states front window(s) noisy during operation A/C compressor leaking Customer states the rear lift gate has rust or corrosion Customer states the parking brake will not disengage or parking brake error/warning light in MFI faults C100C01, C100C07, C100C29 in the ABS module Customer states MIL-on U019900 and/or U020000 in the ECM) Customer states the airbag light is on

VOLKSWAGEN · 2019-10-23

Customer states MIL-on with P1429 and/or P0556 Customer states MIL-on with P0133 Customer states MIL-on with P0496 Customer states MIL-on with P050A Customer states MIL-on with P0116 Customer states front window(s) noisy during operation A/C compressor leaking Customer states the rear lift gate has rust or corrosion Customer states the parking brake will not disengage or parking brake error/warning light in MFI faults C100C01, C100C07, C100C29 in the ABS module Customer states MIL-on U019900 and/or U020000 in the ECM) Customer states the airbag light is on

VOLKSWAGEN · 2019-10-21

Customer states MIL-on with P1429 and/or P0556 Customer states MIL-on with P0133 Customer states MIL-on with P0496 Customer states MIL-on with P050A Customer states MIL-on with P0116 Customer states the rear lift gate has rust or corrosion Customer states "door warning light" on dash and/or locks, mirrors or window functions inoperative A/C compressor leaking Customer states front window(s) noisy during operation Customer states the parking brake will not disengage or parking brake error/warning light in MFI faults C100C01, C100C07, C100C29 in the ABS module Customer states MIL-on U019900 and/or U020000 in the ECM)