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VAG Group
🔴 High
VAG Group
P1556
VAG P1556 Charge Pressure Control: Negative Deviation
The P1556 fault on your VAG Group indicates a VAG P1556 Charge Pressure Control: Negative Deviation. Your VAG Group has registered an anomaly during a diagnostic self-test, indicating the system is struggling to reach its target operating range.
Brand
VAG Group
Fault Code
P1556
Severity
🔴 High
Models
Golf, Passat, A4, A6, Octavia, Leon, Ibiza
🛠️ Diagnostic Overview
Difficulty Level
🛠️🛠️
Medium (Moderate)
Estimated Time
⏱️ 1-2 Hours
🧰 Required Tools
- ✓ Digital Multimeter
- ✓ Socket Wrench & Hand Tools
- ✓ Smoke Leak Detector / Vacuum Gauge
⚠️ Possible Causes
- • Vacuum leak or failed N75 valve. Common issue on Vag vehicles.
🔧 Recommended Fixes
- → Perform a detailed visual inspection of the wiring harness
- → Check for relevant technical service bulletins (TSB) for this VAG Group model
- → Verify sensor resistance values against factory specifications
- → Clear the DTC memory and perform a test drive to verify the fix
🔴 This is a high-priority fault. Have the vehicle inspected by a qualified technician as soon as possible.
🚗 Commonly Affected Vehicles
🏭 VAG Group – Other Common Fault Codes
00287
VAG 00287 ABS Wheel Speed Sensor Right Front (G45)
🔴 High
01217
VAG 01217 DSG Mechatronic Valve Fault
🚨 Critical
16684
VAG 16684 Random/Multiple Cylinder Misfire Detected
🔴 High
17964
VAG 17964 Charge Pressure Control: Negative Deviation
🔴 High
P2563
VAG P2563 Turbo Boost Position Sensor Implausible
🟡 Medium
P0401
VAG P0401 Exhaust Gas Recirculation (EGR) Flow Insufficient
🟡 Medium
P0087
VAG P0087 Fuel Rail/System Pressure - Too Low
🔴 High
P2015
VAG P2015 Intake Manifold Flap Position Sensor Implausible
🔴 High
P0299
VAG P0299 Turbocharger Underboost Condition
🚨 Critical
P1128
VAG P1128 Long Term Fuel Trim Bank 1: System Too Lean
🔴 High
17544
Long Term Fuel Trim Too Lean Bank 1 (AIR System)
🟡 Medium
18010
Power Supply Terminal 30 Voltage Too Low
🔴 High
16684
Random Misfire – 1.4 TSI Timing Chain
🔴 High
00287
ABS Speed Sensor Front Right G45 Signal Implausible
🔴 High
000772
Haldex Coupling: Oil Pump Motor Fault (4Motion)
🔴 High
01217
DSG / S-tronic: Mechatronic Unit Adaptation Fault
🟡 Medium
01316
No Communication with ABS Control Module
🟡 Medium
19456
High Voltage Battery Malfunction (Golf GTE/e-tron)
🟡 Medium
P1603
VAG VAG Internal Control Module Self-Test Error
🔴 High
P1570
VAG VAG Engine Control Module Blocked by Immobilizer
🚨 Critical
P1297
VAG VAG Pressure Drop between Turbo and Throttle Valve
🟡 Medium
P0441
VAG VAG EVAP System Incorrect Purge Flow
🟡 Medium
P0011
VAG VAG Camshaft Timing Over-Advanced (Bank 1)
🔴 High
P1176
VAG VAG O2 Correction Behind Catalyst (Bank 1) Limit Attained
🟡 Medium
P0234
VAG VAG Turbocharger Overboost Condition (Negative Deviation)
🚨 Critical
P0403
VAG VAG EGR Valve (N18) Malfunction
🟡 Medium
P2181
VAG VAG Cooling System Performance Fault
🔴 High
P0087
VAG VAG Fuel Rail/System Pressure Too Low
🚨 Critical
P1602
VAG P1602 Power Supply Terminal 30: Voltage too Low
🔴 High
P1557
VAG P1557 Charge Pressure Control: Positive Deviation
🔴 High
17964
VAG 17964 Charge Pressure Control: Negative Deviation
🔴 High
16684
VAG 16684 Random/Multiple Cylinder Misfire Detected
🔴 High
00283
VAG 00283 ABS Wheel Speed Sensor: Front Left (G47)
🔴 High
01217
VAG 01217 Side Airbag Igniter; Driver Side (N199)
🔴 High
00575
VAG 00575 Intake Manifold Pressure
🔴 High
01314
VAG 01314 Engine Control Module: No Communications
🔴 High
00778
VAG 00778 Steering Angle Sensor (G85)
🔴 High
P0032
VAG P0032 HO2S Heater Control Circuit High (Bank 1 Sensor 1)
🔴 High
P0037
VAG P0037 HO2S Heater Control Circuit Low (Bank 1 Sensor 2)
🚨 Critical
P0038
VAG P0038 HO2S Heater Control Circuit High (Bank 1 Sensor 2)
🚨 Critical
P0051
VAG P0051 HO2S Heater Control Circuit Low (Bank 2 Sensor 1)
🟡 Medium
P0057
VAG P0057 HO2S Heater Control Circuit Low (Bank 2 Sensor 2)
🚨 Critical
P0058
VAG P0058 HO2S Heater Control Circuit High (Bank 2 Sensor 2)
🔴 High
P0103
VAG P0103 Mass or Volume Air Flow Circuit High Input
🚨 Critical
P0107
VAG P0107 Manifold Absolute Pressure/Barometric Pressure Circuit Low Input
🚨 Critical
P0108
VAG P0108 Manifold Absolute Pressure/Barometric Pressure Circuit High Input
🔴 High
P0112
VAG P0112 Intake Air Temperature Circuit Low Input
🟢 Low
P0117
VAG P0117 Engine Coolant Temperature Circuit Low Input
🚨 Critical
P0118
VAG P0118 Engine Coolant Temperature Circuit High Input
🟡 Medium
P0122
VAG P0122 Throttle/Pedal Position Sensor/Switch A Circuit Low Input
🚨 Critical
P0123
VAG P0123 Throttle/Pedal Position Sensor/Switch A Circuit High Input
🟡 Medium
P0125
VAG P0125 Insufficient Coolant Temperature for Closed Loop Fuel Control
🔴 High
P0131
VAG P0131 O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)
🟡 Medium
P0132
VAG P0132 O2 Sensor Circuit High Voltage (Bank 1 Sensor 1)
🟡 Medium
P0134
VAG P0134 O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
🟡 Medium
P0137
VAG P0137 O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)
🟡 Medium
P0138
VAG P0138 O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)
🚨 Critical
P0151
VAG P0151 O2 Sensor Circuit Low Voltage (Bank 2 Sensor 1)
🚨 Critical
P0152
VAG P0152 O2 Sensor Circuit High Voltage (Bank 2 Sensor 1)
🚨 Critical
P0157
VAG P0157 O2 Sensor Circuit Low Voltage (Bank 2 Sensor 2)
🟢 Low
P0158
VAG P0158 O2 Sensor Circuit High Voltage (Bank 2 Sensor 2)
🟡 Medium
P0200
VAG P0200 Injector Circuit Malfunction
🟢 Low
P0231
VAG P0231 Fuel Pump Secondary Circuit Low
🟡 Medium
P0232
VAG P0232 Fuel Pump Secondary Circuit High
🟢 Low
P0327
VAG P0327 Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)
🟡 Medium
P0328
VAG P0328 Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)
🔴 High
P0332
VAG P0332 Knock Sensor 2 Circuit Low Input (Bank 2)
🟢 Low
P0333
VAG P0333 Knock Sensor 2 Circuit High Input (Bank 2)
🟡 Medium
P0440
VAG P0440 Evaporative Emission Control System Malfunction
🔴 High
P0443
VAG P0443 Evaporative Emission System Purge Control Valve Circuit
🟢 Low
P0446
VAG P0446 Evaporative Emission System Vent Control Circuit Malfunction
🟢 Low
P0451
VAG P0451 Evaporative Emission System Pressure Sensor Range/Performance
🟡 Medium
P0452
VAG P0452 Evaporative Emission System Pressure Sensor Low Input
🟢 Low
P0453
VAG P0453 Evaporative Emission System Pressure Sensor High Input
🚨 Critical
P0462
VAG P0462 Fuel Level Sensor Circuit Low Input
🚨 Critical
P0463
VAG P0463 Fuel Level Sensor Circuit High Input
🚨 Critical
P0502
VAG P0502 Vehicle Speed Sensor Circuit Low Input
🔴 High
P0503
VAG P0503 Vehicle Speed Sensor Intermittent/Erratic/High
🟡 Medium
P0505
VAG P0505 Idle Control System Malfunction
🟡 Medium
P0506
VAG P0506 Idle Control System RPM Lower Than Expected
🟡 Medium
P0507
VAG P0507 Idle Control System RPM Higher Than Expected
🟡 Medium
P0562
VAG P0562 System Voltage Low
🔴 High
P0563
VAG P0563 System Voltage High
🔴 High
P0601
VAG P0601 Internal Control Module Memory Check Sum Error
🟡 Medium
P0603
VAG P0603 Internal Control Module Keep Alive Memory (KAM) Error
🔴 High
P0604
VAG P0604 Internal Control Module Random Access Memory (RAM) Error
🔴 High
P0605
VAG P0605 Internal Control Module Read Only Memory (ROM) Error
🚨 Critical
P0606
VAG P0606 ECM/PCM Processor Fault
🟢 Low
P0705
VAG P0705 Transmission Range Sensor Circuit Malfunction (PRNDL Input)
🔴 High
P0706
VAG P0706 Transmission Range Sensor Circuit Range/Performance
🟡 Medium
P0715
VAG P0715 Input/Turbine Speed Sensor Circuit Malfunction
🚨 Critical
P0720
VAG P0720 Output Speed Sensor Circuit Malfunction
🔴 High
P0722
VAG P0722 Output Speed Sensor No Signal
🔴 High
P0731
VAG P0731 Gear 1 Incorrect Ratio
🟡 Medium
P0732
VAG P0732 Gear 2 Incorrect Ratio
🔴 High
P0733
VAG P0733 Gear 3 Incorrect Ratio
🚨 Critical
P0734
VAG P0734 Gear 4 Incorrect Ratio
🟡 Medium
P0740
VAG P0740 Torque Converter Clutch Circuit Malfunction
🔴 High
P0741
VAG P0741 Torque Converter Clutch Circuit Performance or Stuck Off
🟡 Medium
P0750
VAG P0750 Shift Solenoid A Malfunction
🟢 Low
P0751
VAG P0751 Shift Solenoid A Performance or Stuck Off
🟢 Low
P0753
VAG P0753 Shift Solenoid A Electrical
🟢 Low
P0805
VAG P0805 Clutch Position Sensor Circuit Malfunction
🚨 Critical
P0810
VAG P0810 Clutch Position Control Error
🟢 Low
P1135
VAG P1135 Air/Fuel Sensor Heater Circuit Malfunction
🚨 Critical
P1155
VAG P1155 Alternative Fuel Control Module RAM Error
🟡 Medium
P1300
VAG P1300 Igniter Circuit Malfunction
🟡 Medium
P1349
VAG P1349 VVT System Malfunction
🟡 Medium
P1410
VAG P1410 Secondary Air Injection System Control Valve Stuck Open
🟡 Medium
P1500
VAG P1500 Vehicle Speed Sensor Malfunction
🔴 High
P1600
VAG P1600 ECM Battery Back-up Circuit Malfunction
🔴 High
P2101
VAG P2101 Throttle Actuator Control Motor Circuit Range/Performance
🟡 Medium
P2122
VAG P2122 Throttle/Pedal Position Sensor/Switch D Circuit Low Input
🟢 Low
P2123
VAG P2123 Throttle/Pedal Position Sensor/Switch D Circuit High Input
🚨 Critical
P2135
VAG P2135 Throttle/Pedal Position Sensor/Switch A/B Voltage Correlation
🟡 Medium
P2138
VAG P2138 Throttle/Pedal Position Sensor/Switch D/E Voltage Correlation
🔴 High
U0073
VAG U0073 Control Module Communication Bus A Off
🚨 Critical