Volkswagen Cars 2000-05

2.0L L4 - U/K 10

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Trouble Code: P3081



Engine Temperature Too Low

Possible Causes:



Engine hasn-t completely warmed up
 
Radiator malfunction
 
Thermostat malfunction
 
ECM failure
 

Trouble Code: P3096



Internal Control Module Memory, Check Sum Error

Possible Causes:



Battery terminal corrosion, or loose battery connection
 
Connection to the ECM interrupted, or the circuit has been opened
 
Reprogramming error has occurred
 
ECM has failed and needs replacement.
 
Voltage supply for Engine Control Module (ECM) is faulty
 

Trouble Code: P3097



Internal Control Module Memory, Check Sum Error

Possible Causes:



Battery terminal corrosion, or loose battery connection
 
Connection to the ECM interrupted, or the circuit has been opened
 
Reprogramming error has occurred
 
ECM has failed and needs replacement.
 
Voltage supply for Engine Control Module (ECM) is faulty
 

Trouble Code: P3211



Exhaust (Bank 1 Sensor 1) Heater Return Connection

Possible Causes:



Check activation of Recirculation Pump Relay
 
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
 

Trouble Code: P3255



O2 Sensor Before Catalytic Converter (Bank 1), Heating Circuit Regulation at Upper Impact

Possible Causes:



Check activation of Recirculation Pump Relay
 
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
 

Trouble Code: P3056



O2 Sensor Before Catalytic Converter (Bank 1), Heating Circuit Regulation at Lower Impact

Possible Causes:



Check activation of Recirculation Pump Relay
 
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
 

Trouble Code: P3266



Internal Resistance (Bank 1, Sensor 1) Too Large

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
 
Circuit wiring has a short to power or ground
 
Engine Component Power Supply Relay is faulty
 
E-box fuses for oxygen sensor are faulty
 
Leaks present in the exhaust manifold or exhaust pipes
 
HO2S signal wire and ground wire crossed in connector
 
HO2S element is fuel contaminated or has failed
 
ECM has failed
 

Trouble Code: U0001



High Speed CAN Communication Bus

Possible Causes:



ECM has failed
 
CAN data bus wires have short circuited to each other
 

Trouble Code: U0101



Lost Communication With TCM

Possible Causes:



ECM has failed
 
Terminal resistance for CAN-bus are faulty
 
Can data bus wires have short circuited to each other
 
TCM has failed
 

Trouble Code: U0103



Lost Communication With Gear Shift Module

Possible Causes:



ECM has failed
 
Terminal resistance for CAN-bus are faulty
 
Can data bus wires have short circuited to each other
 
The gear shift module has failed
 

Trouble Code: U0121



Lost Communication With Anti-Lock Brake System (ABS) Control Module

Possible Causes:



ECM has failed
 
Terminal resistance for CAN-bus are faulty
 
Can data bus wires have short circuited to each other
 
There is a fault with the ABS control module
 

Trouble Code: U0155



Lost Communication With Instrument Cluster

Possible Causes:



ECM has failed
 
Terminal resistance for CAN-bus are faulty
 
Can data bus wires have short circuited to each other
 

Trouble Code: U0302



Software Incompatibility with Transmission Control Module

Possible Causes:



ECM or TCM has failed or is not properly coded
 
Terminal resistance for CAN-bus are faulty
 
Can data bus wires have short circuited to each other
 

Trouble Code: U0315



Software Incompatibility with Anti-Lock Brake System Control Module

Possible Causes:



ECM has failed
 
Terminal resistance for CAN-bus are faulty
 
Can data bus wires have short circuited to each other
 
The AB S control module has failed
 

Trouble Code: U0402



Invalid Data Received From Transmission Control Module

Possible Causes:



ECM or TCM has failed
 
Terminal resistance for CAN-bus are faulty
 
Can data bus wires have short circuited to each other
 

Trouble Code: U0404



Invalid Data Received From Gear Shift Control Module

Possible Causes:



ECM has failed
 
Terminal resistance for CAN-bus are faulty
 
Can data bus wires have short circuited to each other
 
Gear shift control module has failed
 

Trouble Code: U0415



Software Incompatibility with Anti-Lock Brake System Control Module

Possible Causes:



ECM has failed
 
Terminal resistance for CAN-bus are faulty
 
Can data bus wires have short circuited to each other
 
The ABS control module has failed
 

Trouble Code: P0100



Mass Air Flow Circuit Range/Performance Conditions

Possible Causes:



Mass air flow (MAF) sensor has failed or is damaged
 
MAF sensor signal circuit is open, shorted to ground or to B+
 
ECM has failed
 

Trouble Code: P0101



Mass or Volume Air Flow Circ. Range/Performance Conditions

Possible Causes:



Mass air flow (MAF) sensor has failed or is damaged
 
ECM has failed
 
Signal and ground wires of Mass Air Flow (MAF) sensor has short circuited
 

Trouble Code: P0121



TP Sensor Signal Range/Performance

Possible Causes:



Throttle plate is binding, dirty or sticking
 
Throttle valve is damaged or dirty
 
Throttle valve control module is faulty
 
TP sensor signal circuit open (inspect wiring & connector)
 
TP sensor ground circuit open (inspect wiring & connector)
 
TP sensor and/or control module is damaged or has failed
 
MAF sensor signal is damaged, has failed or a short is present
 

Trouble Code: P0128



Intake Air Temperature Sensor 2 Circuit High Input

Possible Causes:



Check the operation of the thermostat (it may be stuck open)
 
ECT sensor or CHT sensor is out-of-calibration, or has failed
 
Inspect for low coolant level or an incorrect coolant mixture
 

Trouble Code: P0181



Engine Fuel Temperature Sensor -A- Circuit Range/Performance

Possible Causes:



EFT sensor connector is damaged or shorted
 
EFT sensor VREF circuit is open or shorted to ground
 
EFT sensor circuit is shorted to chassis or to sensor ground
 
EFT sensor is damaged or it has failed
 
ECM has failed
 

Trouble Code: P0182



Engine Fuel Temperature Sensor -A- Circuit Low Input

Possible Causes:



EFT sensor connector is damaged or shorted
 
EFT sensor VREF circuit is open or shorted to ground
 
EFT sensor circuit is shorted to chassis or to sensor ground
 
EFT sensor is damaged or it has failed
 
ECM has failed
 

Trouble Code: P0183



Engine Fuel Temperature Sensor -A- Circuit High Input

Possible Causes:



EFT sensor connector is damaged, loose or open
 
EFT sensor signal circuit is open or it is shorted to VREF (5v)
 
EFT sensor is damaged or it has failed
 
ECM has failed
 

Trouble Code: P0200



Injector Circuit Open

Possible Causes:



Injector connector is damaged, open or shorted
 
Injector control circuit is open, shorted to ground or to power
 
ECM has failed (the injector driver circuit may be damaged)
 

Trouble Code: P0225



Throttle Position Sensor -C- Signal Voltage Supply

Possible Causes:



Throttle body is damaged
 
Throttle linkage is binding or sticking
 
ETC TP Sensor -C- signal circuit to the ECM is open
 
ETC TP Sensor -C- ground circuit is open
 
ETC TP Sensor -C- is damaged or it has failed
 

Trouble Code: P0226



Throttle Position Sensor -C- Signal Performance

Possible Causes:



Throttle body is damaged
 
Throttle linkage is binding or sticking
 
ETC TP Sensor -C- signal circuit to the ECM is open
 
ETC TP Sensor -C- ground circuit is open
 
ETC TP Sensor -C- is damaged or it has failed
 

Trouble Code: P0228



Throttle Position Sensor -C- Circuit High Input

Possible Causes:



ETC TP Sensor -C- connector is damaged or open
 
ETC TP Sensor -C- signal circuit is open
 
ETC TP Sensor -C- signal circuit is shorted to VREF (5v)
 
ETC TP Sensor -C- is damaged or it has failed
 

Trouble Code: P0231



Fuel Pump Secondary Circuit Low

Possible Causes:



FP or FSV circuit is open or shorted
 
Fuel pump relay VPWR circuit open
 
Fuel pump relay is damaged or has failed
 
Fuel pressure sensor has failed
 
Fuel pump control module is faulty
 
ECM has failed
 

Trouble Code: P0232



Fuel Pump Secondary Circuit High

Possible Causes:



FP or FSV circuit is open or shorted
 
Fuel pump relay VPWR circuit open
 
Fuel pump relay is damaged or has failed
 
Fuel pressure sensor has failed
 
Fuel pump control module is faulty
 
ECM has failed
 

Trouble Code: P0263



Cylinder 1 Contribution/Balance

Possible Causes:



Check activation of valve for pump/injector
 
ECM has failed
 
Fuel pump relay has failed
 
Fuel injectors may have malfunctioned
 

Trouble Code: P0266



Cylinder 2 Contribution/Balance

Possible Causes:



Check activation of valve for pump/injector
 
ECM has failed
 
Fuel pump relay has failed
 
Fuel injectors may have malfunctioned
 

Trouble Code: P0269



Cylinder 3 Contribution/Balance

Possible Causes:



Check activation of valve for pump/injector
 
ECM has failed
 
Fuel pump relay has failed
 
Fuel injectors may have malfunctioned
 

Trouble Code: P0272



Cylinder 4 Contribution/Balance

Possible Causes:



Check activation of valve for pump/injector
 
ECM has failed
 
Fuel pump relay has failed
 
Fuel injectors may have malfunctioned
 

Trouble Code: P0300



Random Misfire Detected

Possible Causes:



Base engine mechanical fault that affects two or more cylinders
 
Fuel metering fault that affects two or more cylinders
 
Fuel pressure too low or too high, fuel supply contaminated
 
EVAP system problem or the EVAP canister is fuel saturated
 
EGR valve is stuck open or the PCV system has a vacuum leak
 
Ignition system fault (coil, plugs) affecting two or more cylinders
 
MAF sensor contamination (it can cause a very lean condition)
 
Vehicle driven while very low on fuel (less than 1/8 of a tank)
 

Trouble Code: P0401



Exhaust Gas Recirculation Malfunction (ESM System)

Possible Causes:



EGR valve hoses are damaged, leaking or restricted
 
EGR vacuum regulator solenoid valve has failed or is dirty
 
EGR valve source hoses loose or connected wrong
 
Potentiometer for the EGR is faulty
 
EGR valve connector is damaged, loose or shorted
 
EGR valve is damaged or it has failed
 
ECM has failed
 

Trouble Code: P0402



EGR Flow At Idle Speed Detected (ESM System)

Possible Causes:



EGR valve hoses are damaged, leaking or restricted
 
EGR vacuum regulator solenoid valve has failed or is dirty
 
EGR valve source hoses loose or connected wrong
 
Potentiometer for the EGR is faulty
 
EGR valve connector is damaged, loose or shorted
 
EGR valve is damaged or it has failed
 
ECM has failed
 

Trouble Code: P0403



EGR Solenoid Circuit Malfunction

Possible Causes:



EGR valve hoses are damaged, leaking or restricted
 
EGR vacuum regulator solenoid valve has failed or is dirty
 
EGR valve source hoses loose or connected wrong
 
Potentiometer for the EGR is faulty
 
EGR valve connector is damaged, loose or shorted
 
EGR valve is damaged or it has failed
 
ECM has failed
 

Trouble Code: P0404



EGR Control Circuit Range/Performance

Possible Causes:



EGR valve hoses are damaged, leaking or restricted
 
EGR vacuum regulator solenoid valve has failed or is dirty
 
EGR valve source hoses loose or connected wrong
 
Potentiometer for the EGR is faulty
 
EGR valve connector is damaged, loose or shorted
 
EGR valve is damaged or it has failed
 
ECM has failed
 

Trouble Code: P0607



Control Module Performance

Possible Causes:



Clear the trouble codes and then check for this trouble code. If it resets, the ECM has failed and needs replacement.
 
Remember to check for signs of Aftermarket Performance Products installation before replacing the ECM.
 

 
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