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PSA Group
🟢 Low
PSA Group
P0123
PSA P0123 Throttle/Pedal Position Sensor/Switch A Circuit High Input
The P0123 fault on your PSA Group indicates a PSA P0123 Throttle/Pedal Position Sensor/Switch A Circuit High Input. Excessive voltage detected in the circuit, which usually points to a short-to-power or a failing component with excessive internal resistance.
Brand
PSA Group
Fault Code
P0123
Severity
🟢 Low
Models
Peugeot 207/208/3008/5008, Citroën C3/C4/C5, DS3/DS5
🛠️ Diagnostic Overview
Difficulty Level
🛠️🛠️🛠️
Hard (Advanced)
Estimated Time
⏱️ 3-6 Hours
🧰 Required Tools
- ✓ Digital Multimeter
- ✓ Socket Wrench & Hand Tools
- ✓ Smoke Leak Detector / Vacuum Gauge
- ✓ Electrical Contact Cleaner Spray
⚠️ Possible Causes
- • Vacuum leaks in the intake system
- • Dirty sensor elements (oil/carbon)
- • Frayed wires due to engine vibration.
🔧 Recommended Fixes
- → Perform a full diagnostic scan and check live data. Inspect the wiring for Psa-specific corrosion issues. Replace the component with a genuine OEM part.
🚗 Commonly Affected Vehicles
🏭 PSA Group – Other Common Fault Codes
U0100
PSA U0100 Lost Communication With ECM/PCM A
🚨 Critical
B1000
PSA B1000 Airbag Control Module Fault
🟡 Medium
P2293
PSA P2293 Fuel Pressure Regulator 2 Performance
🔴 High
P2279
PSA P2279 Intake Air System Leak
🟡 Medium
P219A
PSA P219A Bank 1 Air-Fuel Ratio Imbalance
🟡 Medium
P2181
PSA P2181 Cooling System Performance
🟡 Medium
P2096
PSA P2096 Post Catalyst Fuel Trim System Too Lean
🟡 Medium
P2015
PSA P2015 Intake Manifold Runner Position Sensor Circuit Range
🔴 High
P1101
PSA P1101 MAF Sensor Out of Self Test Range
🟡 Medium
P0741
PSA P0741 Torque Converter Clutch Circuit Performance
🟡 Medium
P0700
PSA P0700 Transmission Control System Malfunction
🚨 Critical
P0600
PSA P0600 Serial Communication Link Malfunction
🟡 Medium
P0507
PSA P0507 Idle Control System RPM Higher Than Expected
🟡 Medium
P0500
PSA P0500 Vehicle Speed Sensor Malfunction
🟡 Medium
P0456
PSA P0456 EVAP System Leak Detected (very small leak)
🟡 Medium
P0455
PSA P0455 EVAP System Leak Detected (large leak)
🟡 Medium
P0442
PSA P0442 EVAP System Leak Detected (small leak)
🟡 Medium
P0441
PSA P0441 Evaporative Emission System Incorrect Purge Flow
🟡 Medium
P0430
PSA P0430 Catalyst System Efficiency Below Threshold Bank 2
🟡 Medium
P0420
PSA P0420 Catalyst System Efficiency Below Threshold
🟡 Medium
P0400
PSA P0400 Exhaust Gas Recirculation Flow Malfunction
🟡 Medium
P0335
PSA P0335 Crankshaft Position Sensor A Circuit Malfunction
🔴 High
P0325
PSA P0325 Knock Sensor 1 Circuit Malfunction
🟡 Medium
P0304
PSA P0304 Cylinder 4 Misfire Detected
🟡 Medium
P0303
PSA P0303 Cylinder 3 Misfire Detected
🟡 Medium
P0302
PSA P0302 Cylinder 2 Misfire Detected
🟡 Medium
P0301
PSA P0301 Cylinder 1 Misfire Detected
🔴 High
P0300
PSA P0300 Random/Multiple Cylinder Misfire Detected
🚨 Critical
P0299
PSA P0299 Turbocharger Underboost Condition
🚨 Critical
P0234
PSA P0234 Turbocharger Overboost Condition
🚨 Critical
P0175
PSA P0175 System Too Rich Bank 2
🟡 Medium
P0174
PSA P0174 System Too Lean Bank 2
🔴 High
P0172
PSA P0172 System Too Rich Bank 1
🟡 Medium
P0171
PSA P0171 System Too Lean Bank 1
🔴 High
P0141
PSA P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
🟡 Medium
P0135
PSA P0135 O2 Sensor Heater Circuit Malfunction
🟡 Medium
P0133
PSA P0133 O2 Sensor Circuit Slow Response
🟡 Medium
P0130
PSA P0130 O2 Sensor Circuit Malfunction
🔴 High
P0128
PSA P0128 Coolant Thermostat Malfunction
🟡 Medium
P0113
PSA P0113 Intake Air Temperature Circuit High Input
🟡 Medium
P0102
PSA P0102 Mass Air Flow Circuit Low Input
🟡 Medium
P0101
PSA P0101 Mass Air Flow Sensor Circuit Range/Performance
🟡 Medium
P0088
PSA P0088 Fuel Rail/System Pressure - Too High
🟡 Medium
P0016
PSA P0016 Crankshaft Position - Camshaft Position Correlation
🚨 Critical
P0012
PSA P0012 A Camshaft Position Timing Over-Retarded
🟡 Medium
P0011
PSA P0011 A Camshaft Position Timing Over-Advanced
🟡 Medium
P0010
PSA P0010 A Camshaft Position Actuator Circuit
🟡 Medium
P0340
CMP Sensor Signal Fault (TU/EW Petrol Engines)
🔴 High
U1213
BSI Internal Fault / Communication Failure
🔴 High
P0401
EGR Insufficient Flow (HDi DV4/DV6/DW10 Diesel)
🟡 Medium
P2187
System Too Lean at Idle (THP 1.6 Prince Engine)
🟡 Medium
P0087
Fuel Pressure Too Low (HDi Common Rail Diesel)
🔴 High
P2002
DPF (FAP) Efficiency Below Threshold (HDi Diesel)
🔴 High
P1336
Crankshaft Position Sensor Adaptation Required
🔴 High
P1336
PSA P1336 Crank/Cam Adaptation Fault
🔴 High
P0420
PSA P0420 Catalyst Downstream Aging
🔴 High
P0087
PSA P0087 High Pressure Fuel Rail Low
🔴 High
P1434
PSA P1434 Additive System Fault
🔴 High
P1435
PSA P1435 Additive System Level Error
🔴 High
P0299
PSA P0299 HDi Underboost
🔴 High
P0171
PSA P0171 PureTech Lean Mixture
🔴 High
P0100
PSA P0100 MAF Signal Incoherent
🔴 High
BSI-01
PSA BSI-01 BSI Supply Error
🔴 High
P1160
PSA P1160 Intake Air Leak
🔴 High
P0032
PSA P0032 HO2S Heater Control Circuit High (Bank 1 Sensor 1)
🚨 Critical
P0037
PSA P0037 HO2S Heater Control Circuit Low (Bank 1 Sensor 2)
🚨 Critical
P0038
PSA P0038 HO2S Heater Control Circuit High (Bank 1 Sensor 2)
🚨 Critical
P0051
PSA P0051 HO2S Heater Control Circuit Low (Bank 2 Sensor 1)
🔴 High
P0057
PSA P0057 HO2S Heater Control Circuit Low (Bank 2 Sensor 2)
🟡 Medium
P0058
PSA P0058 HO2S Heater Control Circuit High (Bank 2 Sensor 2)
🟢 Low
P0103
PSA P0103 Mass or Volume Air Flow Circuit High Input
🚨 Critical
P0107
PSA P0107 Manifold Absolute Pressure/Barometric Pressure Circuit Low Input
🟡 Medium
P0108
PSA P0108 Manifold Absolute Pressure/Barometric Pressure Circuit High Input
🔴 High
P0112
PSA P0112 Intake Air Temperature Circuit Low Input
🟡 Medium
P0117
PSA P0117 Engine Coolant Temperature Circuit Low Input
🚨 Critical
P0118
PSA P0118 Engine Coolant Temperature Circuit High Input
🟡 Medium
P0122
PSA P0122 Throttle/Pedal Position Sensor/Switch A Circuit Low Input
🟡 Medium
P0125
PSA P0125 Insufficient Coolant Temperature for Closed Loop Fuel Control
🟡 Medium
P0131
PSA P0131 O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)
🟡 Medium
P0132
PSA P0132 O2 Sensor Circuit High Voltage (Bank 1 Sensor 1)
🚨 Critical
P0134
PSA P0134 O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
🟢 Low
P0137
PSA P0137 O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)
🔴 High
P0138
PSA P0138 O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)
🔴 High
P0151
PSA P0151 O2 Sensor Circuit Low Voltage (Bank 2 Sensor 1)
🟡 Medium
P0152
PSA P0152 O2 Sensor Circuit High Voltage (Bank 2 Sensor 1)
🚨 Critical
P0157
PSA P0157 O2 Sensor Circuit Low Voltage (Bank 2 Sensor 2)
🟢 Low
P0158
PSA P0158 O2 Sensor Circuit High Voltage (Bank 2 Sensor 2)
🟢 Low
P0200
PSA P0200 Injector Circuit Malfunction
🔴 High
P0231
PSA P0231 Fuel Pump Secondary Circuit Low
🟡 Medium
P0232
PSA P0232 Fuel Pump Secondary Circuit High
🚨 Critical
P0327
PSA P0327 Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)
🟡 Medium
P0328
PSA P0328 Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)
🟡 Medium
P0332
PSA P0332 Knock Sensor 2 Circuit Low Input (Bank 2)
🔴 High
P0333
PSA P0333 Knock Sensor 2 Circuit High Input (Bank 2)
🟡 Medium
P0440
PSA P0440 Evaporative Emission Control System Malfunction
🚨 Critical
P0443
PSA P0443 Evaporative Emission System Purge Control Valve Circuit
🟡 Medium
P0446
PSA P0446 Evaporative Emission System Vent Control Circuit Malfunction
🔴 High
P0451
PSA P0451 Evaporative Emission System Pressure Sensor Range/Performance
🟡 Medium
P0452
PSA P0452 Evaporative Emission System Pressure Sensor Low Input
🟢 Low
P0453
PSA P0453 Evaporative Emission System Pressure Sensor High Input
🔴 High
P0462
PSA P0462 Fuel Level Sensor Circuit Low Input
🔴 High
P0463
PSA P0463 Fuel Level Sensor Circuit High Input
🔴 High
P0502
PSA P0502 Vehicle Speed Sensor Circuit Low Input
🟡 Medium
P0503
PSA P0503 Vehicle Speed Sensor Intermittent/Erratic/High
🔴 High
P0505
PSA P0505 Idle Control System Malfunction
🟢 Low
P0506
PSA P0506 Idle Control System RPM Lower Than Expected
🟢 Low
P0562
PSA P0562 System Voltage Low
🚨 Critical
P0563
PSA P0563 System Voltage High
🟡 Medium
P0601
PSA P0601 Internal Control Module Memory Check Sum Error
🚨 Critical
P0603
PSA P0603 Internal Control Module Keep Alive Memory (KAM) Error
🟢 Low
P0604
PSA P0604 Internal Control Module Random Access Memory (RAM) Error
🔴 High
P0605
PSA P0605 Internal Control Module Read Only Memory (ROM) Error
🟢 Low
P0606
PSA P0606 ECM/PCM Processor Fault
🟢 Low
P0705
PSA P0705 Transmission Range Sensor Circuit Malfunction (PRNDL Input)
🟡 Medium
P0706
PSA P0706 Transmission Range Sensor Circuit Range/Performance
🟡 Medium
P0715
PSA P0715 Input/Turbine Speed Sensor Circuit Malfunction
🟢 Low
P0720
PSA P0720 Output Speed Sensor Circuit Malfunction
🟢 Low
P0722
PSA P0722 Output Speed Sensor No Signal
🔴 High
P0731
PSA P0731 Gear 1 Incorrect Ratio
🚨 Critical