Volkswagen Cars 2000-05

2.0L L4 - U/K 8

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Trouble Code: P1630



Acceleration Pedal Position Sensor 1 Signal Too Low

Possible Causes:



Ground between engine and chassis may be broken
 
Throttle position sensor may have failed
 
Accelerator Pedal Position Sensor 2 has failed
 
Throttle position sensor wiring may have shorted
 
Faulty voltage supply
 
ECM has failed
 

Trouble Code: P1631



Acceleration Pedal Position Sensor 1 Signal Too High

Possible Causes:



Ground between engine and chassis may be broken
 
Throttle position sensor may have failed
 
Accelerator Pedal Position Sensor 2 has failed
 
Throttle position sensor wiring may have shorted
 
Faulty voltage supply
 
ECM has failed
 

Trouble Code: P1633



Acceleration Pedal Position Sensor 2 Signal Too Low

Possible Causes:



Ground between engine and chassis may be broken
 
Throttle position sensor may have failed
 
Accelerator Pedal Position Sensor 2 has failed
 
Throttle position sensor wiring may have shorted
 
Faulty voltage supply
 
ECM has failed
 

Trouble Code: P1634



Acceleration Pedal Position Sensor 2 Signal Too High

Possible Causes:



Ground between engine and chassis may be broken
 
Throttle position sensor may have failed
 
Accelerator Pedal Position Sensor 2 has failed
 
Throttle position sensor wiring may have shorted
 
Faulty voltage supply
 
ECM has failed
 

Trouble Code: P1635



Data BUS Powertrain Missing Message From Central A/C Control

Possible Causes:



Check the Terminal resistance for CAN-bus
 
Data-Bus wires have short
 
Data-Bus components are malfunctioning
 
ECM has failed
 

Trouble Code: P1639



Accelerator Pedal Position Sensor 1+2 Range/Performance

Possible Causes:



Ground between engine and chassis may be broken
 
Throttle position sensor may have failed
 
Accelerator Pedal Position Sensor 2 has failed
 
Throttle position sensor wiring may have shorted
 
Faulty voltage supply
 
ECM has failed
 

Trouble Code: P1640



Internal Control Module (EEPROM) Error

Possible Causes:



Engine Control Module (ECM) has failed
 
Voltage supply for Engine Control Module (ECM) has shorted
 

Trouble Code: P1647



Please Check Coding of the ECUs in the Data Bus Powertrain

Possible Causes:



Engine Control Module (ECM) has failed
 
Voltage supply for Engine Control Module (ECM) has shorted
 

Trouble Code: P1648



Data Bus Powertrain Malfunction

Possible Causes:



Ground between engine and chassis may be broken
 
Throttle position sensor may have failed
 
Accelerator Pedal Position Sensor 2 has failed
 
Throttle position sensor wiring may have shorted
 
Faulty voltage supply
 
ECM has failed
 

Trouble Code: P1649



Data Bus Powertrain Missing Message from ABS Control Module

Possible Causes:



Ground between engine and chassis may be broken
 
Throttle position sensor may have failed
 
Accelerator Pedal Position Sensor 2 has failed
 
Throttle position sensor wiring may have shorted
 
Faulty voltage supply
 
Check the Terminal resistance for CAN-bus
 
Data-Bus wires have short
 
Data-Bus components are malfunctioning
 
ECM has failed
 

Trouble Code: P1650



Data Bus Powertrain Missing Message from Instrument Panel ECU

Possible Causes:



Ground between engine and chassis may be broken
 
Faulty voltage supply
 
ECM has failed
 

Trouble Code: P1778



Solenoid EV7 Electrical Malfunction

Possible Causes:



Valve body solenoid valve has a short
 
The TCM has failed
 
ECM has failed
 

Trouble Code: P1823



Pressure Control Solenoid 3 Electrical

Possible Causes:



Solenoid valves in valve body are faulty
 
Solenoid circuit is shorting to ground
 
Solenoid circuit is open
 
TCM has failed or wiring is shorting
 
Check harness connector for contact corrosion or water damage
 
Check resistance of solenoid valves may not be up to specification
 
Wires to Transmission Control Module (TCM) may have ground out or open
 
Transmission Control Module (TCM) has failed
 
ECM has failed
 

Trouble Code: P1828



Pressure Control Solenoid 4 Electrical

Possible Causes:



Solenoid valves in valve body are faulty
 
Solenoid circuit is shorting to ground
 
Solenoid circuit is open
 
TCM has failed or wiring is shorting
 
Check harness connector for contact corrosion or water damage
 
Check resistance of solenoid valves may not be up to specification
 
Wires to Transmission Control Module (TCM) may have ground out or open
 
Transmission Control Module (TCM) has failed
 
ECM has failed
 

Trouble Code: P1850



Data BUS Powertrain Missing Message from Engine Control

Possible Causes:



Check the Terminal resistance for CAN-bus
 
Data-Bus wires have short
 
Data-Bus components are malfunctioning
 
ECM has failed
 

Trouble Code: P1853



Data BUS Powertrain Implausible Message from Brake Control

Possible Causes:



Check the Terminal resistance for CAN-bus
 
Data-Bus wires have short
 
Data-Bus components are malfunctioning
 
ECM has failed
 

Trouble Code: P1854



Data BUS Powertrain Hardware Defective

Possible Causes:



Check the Terminal resistance for CAN-bus
 
Data-Bus wires have short
 
Data-Bus components are malfunctioning
 
ECM has failed
 

Trouble Code: P1855



Data BUS Powertrain Software Version Control

Possible Causes:



Check the Terminal resistance for CAN-bus
 
Data-Bus wires have short
 
Data-Bus components are malfunctioning
 
ECM has failed
 

Trouble Code: P1857



Load Signal Error Message From Engine Control

Possible Causes:



Intake Manifold Runner Position Sensor is faulty
 
Intake system has leaks (false air)
 
Motor for intake flap is faulty
 
Mass Air Flow (MAF) sensor has failed
 
ECM has failed
 

Trouble Code: P1861



Throttle Position Sensor Message from ECM

Possible Causes:



Throttle Position (TP) Sensor has failed
 
Accelerator Pedal Position Sensor 2 has failed
 
ECM has failed
 
Ground (GND) connections between engine and chassis must be OK
 
Engine Control Module (ECM) may not connected
 

Trouble Code: P1866



Data Bus Powertrain Missing Messages

Possible Causes:



Check the Terminal resistance for CAN-bus
 
Data-Bus wires have short
 
Data-Bus components are malfunctioning
 
ECM has failed
 

Trouble Code: P2090



-B- Camshaft Position Control Circuit Low Bank 1

Possible Causes:



Camshaft position control wiring harness connector is damaged or open
 
Camshaft adjustment valve has failed
 
Circuit is open or grounded
 
Assembly is damaged or it has failed (an open circuit)
 
ECM power supply relay has failed
 
ECM has failed
 

Trouble Code: P2091



-B- Camshaft Position Control Circuit High Bank 1

Possible Causes:



Camshaft position control wiring harness connector is damaged or open
 
Camshaft adjustment valve has failed
 
Circuit is open or grounded
 
Assembly is damaged or it has failed (an open circuit)
 
ECM power supply relay has failed
 
ECM has failed
 

Trouble Code: P2096



Post Catalyst Fuel Trim System Too Lean (Bank 1)

Possible Causes:



Oxygen sensor (before catalytic converter) is faulty
 
Oxygen sensor (behind catalytic converter) is faulty
 
Oxygen sensor heater (before catalytic converter) is faulty
 
Oxygen sensor heater (behind catalytic converter) is faulty
 
Check circuits for shorts to each other, ground or power
 
ECM has failed
 

Trouble Code: P2097



Post Catalyst Fuel Trim System Too Rich (Bank 1)

Possible Causes:



Oxygen sensor (before catalytic converter) is faulty
 
Oxygen sensor (behind catalytic converter) is faulty
 
Oxygen sensor heater (before catalytic converter) is faulty
 
Oxygen sensor heater (behind catalytic converter) is faulty
 
Check circuits for shorts to each other, ground or power
 
ECM has failed
 

Trouble Code: P2101



Throttle Actuator Control Motor Range/Performance

Possible Causes:



TACM wiring harness connector is damaged or open
 
TACM wiring may be crossed in the wire harness assembly
 
TACM (motor) circuit is open, or TACM assembly is damaged (possible open circuit)
 
TACM or the Throttle Valve is dirty
 
Throttle Position sensor has failed
 
ECM has failed
 

Trouble Code: P2106



Throttle Actuator Control System - Forced Limited Power Conditions

Possible Causes:



TACM wiring harness connector is damaged or open
 
TACM wiring may be crossed in the wire harness assembly
 
TACM (motor) circuit is open, or TACM assembly is damaged (possible open circuit)
 
TACM or the Throttle Valve is dirty
 
Throttle Position sensor has failed
 
ECM has failed
 

Trouble Code: P2122



Accelerator Pedal Position Sensor -D- Circuit Low Input

Possible Causes:



Ground between engine and chassis may be broken
 
Throttle position sensor may have failed
 
Accelerator Pedal Position Sensor has failed
 
Throttle position sensor wiring may have shorted
 
Throttle position sensor has failed
 
Faulty voltage supply
 
ECM has failed
 

Trouble Code: P2123



Accelerator Pedal Position Sensor -D- Circuit High Input

Possible Causes:



Ground between engine and chassis may be broken
 
Throttle position sensor may have failed
 
Accelerator Pedal Position Sensor has failed
 
Throttle position sensor wiring may have shorted
 
Throttle position sensor has failed
 
Faulty voltage supply
 
ECM has failed
 

Trouble Code: P2127



Accelerator Pedal Position Sensor -E- Circuit Low Input

Possible Causes:



Ground between engine and chassis may be broken
 
Throttle position sensor may have failed
 
Accelerator Pedal Position Sensor has failed
 
Throttle position sensor wiring may have shorted
 
Throttle position sensor has failed
 
Faulty voltage supply
 
ECM has failed
 

Trouble Code: P2128



Accelerator Pedal Position Sensor -E- Circuit High Input

Possible Causes:



Ground between engine and chassis may be broken
 
Throttle position sensor may have failed
 
Accelerator Pedal Position Sensor has failed
 
Throttle position sensor wiring may have shorted
 
Throttle position sensor has failed
 
Faulty voltage supply
 
ECM has failed
 

Trouble Code: P2133



Accelerator Pedal Position Sensor -F- Circuit High Input

Possible Causes:



Ground between engine and chassis may be broken
 
Throttle position sensor may have failed
 
Accelerator Pedal Position Sensor has failed
 
Throttle position sensor wiring may have shorted
 
Throttle position sensor has failed
 
Faulty voltage supply
 
ECM has failed
 

Trouble Code: P2138



Throttle Position Sensor D/E Voltage Correlation

Possible Causes:



ETC TP sensor connector is damaged or shorted
 
ETC TP sensor circuits shorted together in the wire harness
 
ETC TP sensor signal circuit is shorted to VREF (5v)
 
ETC TP sensor is damaged or the ECM has failed
 

Trouble Code: P2177



System Too Lean Off Idle Bank 1

Possible Causes:



Intake Manifold Runner Position Sensor has failed
 
Intake system has leaks (false air)
 
Motor for intake flap is faulty
 
Oxygen sensor (before catalytic converter) is faulty
 
Oxygen sensor (behind catalytic converter) is faulty
 
Oxygen sensor heater (before catalytic converter) is faulty
 
Oxygen sensor heater (behind catalytic converter) is faulty
 
Check circuits for shorts to each other, ground or power
 
Fuel Injector(s) may have failed
 
ECM has failed
 

Trouble Code: P2178



System Too Rich Off Idle Bank 1

Possible Causes:



Intake Manifold Runner Position Sensor has failed
 
Intake system has leaks (false air)
 
Motor for intake flap is faulty
 
Oxygen sensor (before catalytic converter) is faulty
 
Oxygen sensor (behind catalytic converter) is faulty
 
Oxygen sensor heater (before catalytic converter) is faulty
 
Oxygen sensor heater (behind catalytic converter) is faulty
 
Check circuits for shorts to each other, ground or power
 
Fuel Injector(s) may have failed
 
ECM has failed
 

Trouble Code: P2181



Cooling System Performance Malfunction

Possible Causes:



ECT sensor has failed
 
ECT Sensor (on Radiator) has failed
 
ECT sensor signal circuit is open (inspect wiring & connector)
 
ECT sensor signal circuit is shorted
 
Cooling system malfunction, or the thermostat is stuck
 
Engine not operating at normal operating temperature
 
EOT sensor is damaged or it has failed
 

Trouble Code: P2184



Engine Coolant Temperature Sensor 2 Circuit Low

Possible Causes:



ECT sensor has failed
 
ECT Sensor (on Radiator) has failed
 
ECT sensor signal circuit is open (inspect wiring & connector)
 
ECT sensor signal circuit is shorted
 
Cooling system malfunction, or the thermostat is stuck
 
Engine not operating at normal operating temperature
 
EOT sensor is damaged or it has failed
 

Trouble Code: P2185



Engine Coolant Temperature Sensor 2 Circuit High

Possible Causes:



ECT sensor has failed
 
ECT Sensor (on Radiator) has failed
 
ECT sensor signal circuit is open (inspect wiring & connector)
 
ECT sensor signal circuit is shorted
 
Cooling system malfunction, or the thermostat is stuck
 
Engine not operating at normal operating temperature
 
EOT sensor is damaged or it has failed
 

Trouble Code: P2187



System Too Lean On Idle Bank 1

Possible Causes:



Evaporative Emission (EVAP) canister purge regulator valve is faulty
 
Exhaust system components are damaged
 
Fuel injectors are faulty
 
Fuel pressure regulator and residual pressure have failed
 
Fuel Pump (FP) in fuel tank is faulty
 
Intake system has leaks (false air)
 
Secondary Air Injection (AIR) system has an improper seal
 
Intake Manifold Runner Position Sensor has failed
 
Motor for intake flap is faulty
 
Oxygen sensor (before catalytic converter) is faulty
 
Oxygen sensor (behind catalytic converter) is faulty
 
Oxygen sensor heater (before catalytic converter) is faulty
 
Oxygen sensor heater (behind catalytic converter) is faulty
 
Check circuits for shorts to each other, ground or power
 
ECM has failed
 

Trouble Code: P2188



System Too Rich On Idle Bank 1

Possible Causes:



Evaporative Emission (EVAP) canister purge regulator valve is faulty
 
Exhaust system components are damaged
 
Fuel injectors are faulty
 
Fuel pressure regulator and residual pressure have failed
 
Fuel Pump (FP) in fuel tank is faulty
 
Intake system has leaks (false air)
 
Secondary Air Injection (AIR) system has an improper seal
 
Intake Manifold Runner Position Sensor has failed
 
Motor for intake flap is faulty
 
Oxygen sensor (before catalytic converter) is faulty
 
Oxygen sensor (behind catalytic converter) is faulty
 
Oxygen sensor heater (before catalytic converter) is faulty
 
Oxygen sensor heater (behind catalytic converter) is faulty
 
Check circuits for shorts to each other, ground or power
 
ECM has failed
 

 
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