Volkswagen Cars 2000-05

2.0L L4 - U/K 11

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Trouble Code: P0642



Sensor Reference Voltage -A- Circuit Low

Possible Causes:



Circuit harness connector contacts are corroded or ingressed of water
 
Circuit wires have shorted to each other, to battery or ground
 
Automatic Transmission Hydraulic Pressure Sensor 1 has failed
 
Solenoid valves in valve body are faulty
 
Transmission Control Module (TCM) needs replacing
 
Transmission Input Speed (RPM) Sensor has failed
 
Transmission Output Speed (RPM) Sensor has failed
 

Trouble Code: P0643



Sensor Reference Voltage -A- Circuit High

Possible Causes:



Circuit harness connector contacts are corroded or ingressed of water
 
Circuit wires have shorted to each other, to battery or ground
 
Automatic Transmission Hydraulic Pressure Sensor 1 has failed
 
Solenoid valves in valve body are faulty
 
Transmission Control Module (TCM) needs replacing
 
Transmission Input Speed (RPM) Sensor has failed
 
Transmission Output Speed (RPM) Sensor has failed
 

Trouble Code: P0652



Sensor Reference Voltage -B- Circuit Low

Possible Causes:



Circuit harness connector contacts are corroded or ingressed of water
 
Circuit wires have shorted to each other, to battery or ground
 
Automatic Transmission Hydraulic Pressure Sensor 1 has failed
 
Solenoid valves in valve body are faulty
 
Transmission Control Module (TCM) needs replacing
 
Transmission Input Speed (RPM) Sensor has failed
 
Transmission Output Speed (RPM) Sensor has failed
 

Trouble Code: P0653



Sensor Reference Voltage -B- Circuit High

Possible Causes:



Circuit harness connector contacts are corroded or ingressed of water
 
Circuit wires have shorted to each other, to battery or ground
 
Automatic Transmission Hydraulic Pressure Sensor 1 has failed
 
Solenoid valves in valve body are faulty
 
Transmission Control Module (TCM) needs replacing
 
Transmission Input Speed (RPM) Sensor has failed
 
Transmission Output Speed (RPM) Sensor has failed
 

Trouble Code: P0670



Glow Plug Module Control Circuit

Possible Causes:



Glow plug lamp circuit is open or shorted to ground
 
Glow plug relay control circuit is open or shorted to ground
 
Glow plug relay power circuit is open (test the 12GA fuse link)
 
Glow plug relay is damaged or it has failed
 

Trouble Code: P0671



Cylinder 1 Glow Plug Circuit

Possible Causes:



Glow plug lamp circuit is open or shorted to ground
 
Glow plug relay control circuit is open or shorted to ground
 
Glow plug relay power circuit is open (test the 12GA fuse link)
 
Glow plug relay is damaged or it has failed
 

Trouble Code: P0672



Cylinder 2 Glow Plug Circuit

Possible Causes:



Glow plug lamp circuit is open or shorted to ground
 
Glow plug relay control circuit is open or shorted to ground
 
Glow plug relay power circuit is open (test the 12GA fuse link)
 
Glow plug relay is damaged or it has failed
 

Trouble Code: P0673



Cylinder 3 Glow Plug Circuit

Possible Causes:



Glow plug lamp circuit is open or shorted to ground
 
Glow plug relay control circuit is open or shorted to ground
 
Glow plug relay power circuit is open (test the 12GA fuse link)
 
Glow plug relay is damaged or it has failed
 

Trouble Code: P0674



Cylinder 4 Glow Plug Circuit

Possible Causes:



Glow plug lamp circuit is open or shorted to ground
 
Glow plug relay control circuit is open or shorted to ground
 
Glow plug relay power circuit is open (test the 12GA fuse link)
 
Glow plug relay is damaged or it has failed
 

Trouble Code: P0684



Glow Plug Control Module to PCM Communication Circuit Range/Performance

Possible Causes:



Glow plug lamp circuit is open or shorted to ground
 
Glow plug relay control circuit is open or shorted to ground
 
Glow plug relay power circuit is open (test the 12GA fuse link)
 
Glow plug relay is damaged or it has failed
 

 
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