Volkswagen Workshop Service and Repair Manuals

Fault table   Note t  The fault table is listed in ascending order, according to the 5 digit V.A.G fault code on the left. t  So-called P codes, e.g. P0118, are also output. These P codes have no significance at present, and will only be applied in future self-diagnosis systems. t  Explanations on the fault types (e.g. “open circuit/short-circuit to earth”): → Fault readerV.A.G 1551 operating instructions. t  If components are indicated as faulty: First check the wiring and connectors to these components as well as the system earth connections according to current flow diagram. Only when no fault can be located here should the component be renewed. This is particularly relevant if faults are output as “sporadic” (SP). t  The fault memory must be cleared after rectifying existing faults → Chapter. Output on the fault reader -V.A.G 1551- printer, e.g. 16502  P0118 035 Coolant temperature sender -G62- Signal too large Sporadic fault   Note t  16502 = Fault code t  P0118 = Additional Fault code t  035 = Fault type as a number t  Coolant temperature sender -G62- = faulty current path or fault location t  Signal too high = Fault type as text t  Sporadic faults = Faults that are not always present e.g. loose contact

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
00668
Vehicle voltage terminal 30
	Implausible signal	t  Terminal 30 voltage supply relay -J317- defective t  Relay sticks (sporadically)	t  Engine will not start t  Various running problems including engine will not start	–  Check voltage supply for diesel direct injection system control unit -J248- → Chapter
00741
Brake pedal monitor
	Implausible signal	t  Defective brake light switch -F- t  Defective brake pedal switch -F47-	t  Glow period warning lamp flashes t  Brake light defective	–  Checking signal from brake light switch -F- and brake pedal switch -F47- → Chapter.

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
01044
Control unit incorrectly coded
		t  Invalid control unit coding	t  Glow period warning lamp flashes	–  Code control unit → Chapter
01117
Load signal for alternator terminal DF
	Implausible signal	t  Alternator defective t  Voltage regulator defective t  Wiring open circuit	t  Engine preheating not functioning	–  Check alternator: → Current flow diagrams, Electrical fault finding and Fitting locations

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
01193
Low heat output relay -J359-
	Open circuit/short to earth	t  Wire open circuit or wire has short to earth t  Low heat output relay -J359- defective	t  Engine preheating not functioning	–  Checking low heat output relay -J359- → Chapter, Final control diagnosis
01194
High heat output relay -J360-
		t  Open circuit or line short-circuit t  High heat output relay -J360- defective	t  Engine preheating not functioning	–  Checking high heat output relay -J360- → Chapter, Final control diagnosis

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
01282
Variable intake manifold flap change-over valve -N239-
	Short to positive	t  Wire has short to positive t  Variable intake manifold flap change-over valve -N239- defective/jammed in open direction	t  Cold starting problems t  Cold idling problems t  Hard load changes t  Idling problems	–  Checking variable intake manifold flap change-over valve -N239- → Chapter, Final control diagnosis
	Open circuit/short to earth	t  Wire open circuit or wire has short to earth t  Defective variable intake manifold flap change-over valve -N239-

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
16500 P0116
Coolant temperature sender -G62-
	Implausible signal	t  Defective coolant temperature sender -G62- t  Coolant thermostat defective	t  Black smoke when starting t  Glow period is always approx. 20 seconds	–  Check coolant temperature sender -G62- → Chapter –  Checking coolant thermostat → Engine mechanical system; Rep. Gr.19
16705 P0321
Engine speed sender -G28-
	Implausible signal	t  Defective engine speed sender -G28- t  Gap speed sender/sender wheel too large t  Metal particles on engine speed sender -G28- or retainer loose	t  Engine will not start t  Engine stalls t  Glow period warning lamp flashes t  Rev. counter no display	–  Check engine speed sender -G28- → Chapter

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
16706 P0322
Engine speed sender -G28-
	No signal	t  Open circuit or line short-circuit t  Defective engine speed sender -G28-	t  Engine will not start t  Engine stalls t  Glow period warning lamp flashes t  Rev. counter no display	–  Check engine speed sender -G28- → Chapter
16885 P0501
Vehicle speed signal
	Implausible signal	t  No signal from speedometer sender -G22- t  Dash panel insert defective	t  Speedometer display not OK. t  Vehicle jerks when changing gear	–  Checking speed signal → Chapter
16955 P0571
Brake light switch -F-
	Implausible signal	t  Defective brake light switch -F- t  Defective brake pedal switch -F47-	t  Glow period warning lamp flashes t  Brake light defective	–  Checking -F- and brake pedal switch -F47- → Chapter

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
16989 P0605
Control unit defective		t  Control unit internally defective	t  Various running problems t  Engine stops	–  Renew diesel direct injection system control unit -J248- → Chapter
17568 P1160
Intake manifold temperature sender -G72-
	Short to earth	t  Wiring short to earth t  Defective intake manifold temperature sender -G72-	t  Goes to preset value of 136.8 °C	–  Check intake manifold temperature sender -G72- → Chapter
17569 P1161
Intake manifold temperature sender -G72-
	Open circuit/short to positive	t  Wiring open circuit or wiring short to positive t  Defective intake manifold temperature sender -G72-	t  Goes to preset value of 136.8 °C	–  Check intake manifold temperature sender -G72- → Chapter

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
17570 P1162
Fuel temperature sender -G81-
	Short to earth	t  Wiring short to earth t  Fuel temperature sender -G81- defective	t  Goes to preset value of -5.4°C t  Increased exhaust emissions	–  Check fuel temperature sender -G81- → Chapter
17571 P1163
Fuel temperature sender -G81-
	Open circuit/short to positive	t  Wiring open circuit or wiring short to positive t  Fuel temperature sender -G81- defective	t  Goes to preset value of -5.4°C t  Increased exhaust emissions	–  Check fuel temperature sender -G81- → Chapter

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
17653 P1245
Needle lift sender -G80-
	Short to earth	t  Wiring short to earth t  Needle lift sender -G80- defective	t  Glow period warning lamp flashes t  Engine runs rough t  Reduced performance t  Increased exhaust emissions	–  Checking needle lift sender -G80- → Chapter
17654 P1246
Needle lift sender -G80-
	Implausible signal	t  Shortage of fuel t  Air in fuel system t  Injection line to injector with needle lift sender -G80- not OK. t  Needle lift sender -G80- defective	t  Glow period warning lamp flashes t  Engine runs rough t  Reduced performance t  Increased exhaust emissions	–  Checking needle lift sender -G80- → Chapter

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
17655 P1247
Needle lift sender -G80-
	Open circuit/short to positive	t  Wiring open circuit or wiring short to positive t  Needle lift sender -G80- defective	t  Glow period warning lamp flashes t  Engine runs rough t  Reduced performance t  Increased exhaust emissions	–  Checking needle lift sender -G80- → Chapter
17656 P1248
Injection commencement regulation
	Control difference	t  Fuel tank empty t  Fuel supply not OK., lack of fuel t  Start of delivery not OK. t  Defective commencement of injection valve -N108- t  Needle lift sender -G80- defective	t  Engine runs rough t  Reduced performance t  Increased exhaust emissions t  Poor cold starting	–  Fuel filter or fuel line blocked –  Checking and adjusting commencement of injection → Chapter –  Check commencement of injection valve -N108- → Chapter, Final control diagnosis –  Checking needle lift sender -G80- → Chapter

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
17659 P1251
Commencement of injection valve -N108-
	Short to positive	t  Wire has short to positive	t  Engine knocks when idling, because commencement of injection is constantly “advanced”	–  Check commencement of injection valve -N108- → Chapter, Final control diagnosis
17660 P1252
Commencement of injection valve -N108-
	Open circuit/short to earth	t  Wiring open circuit t  Defective commencement of injection valve -N108-	t  Engine knocks when idling, because commencement of injection is constantly “advanced”	–  Check commencement of injection valve -N108- → Chapter, Final control diagnosis
		t  Wiring short to earth	t  Poor performance, because commencement of injection is constantly “retarded”

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
17663 P1255
Coolant temperature sender -G62-
	Short to earth	t  Wiring short to earth t  Defective coolant temperature sender -G62-	t  Black smoke when starting t  Glow plugs always operate for about 20 seconds	–  Check coolant temperature sender -G62- → Chapter
17664 P1256
Coolant temperature sender -G62-
	Open circuit/short to positive	t  Wiring open circuit or wiring short to positive t  Defective coolant temperature sender -G62-	t  Black smoke when starting t  Glow plugs always operate for about 20 seconds	–  Check coolant temperature sender -G62- → Chapter

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
17762 P1354
Modulating piston movement sender -G149-
	Electrical fault in current circuit	t  Injection pump defective t  Open circuit or line short-circuit	t  Glow period warning lamp flashes t  Various running problems t  Engine stops	–  Checking modulating piston movement sender -G149- → Chapter
17795 P1387
Control unit defective		t  Control unit internally defective	t  Various running problems t  Engine stops	–  Renew diesel direct injection system control unit -J248- → Chapter
17810 P1402
Exhaust gas recirculation valve -N18-
	Short to positive	t  Wire has short to positive	t  No exhaust gas recirculation	–  Check exhaust gas recirculation valve -N18- → Chapter, final control diagnosis

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
17849 P1441
Exhaust gas recirculation valve -N18-
	Open circuit/short to earth	t  Wiring open circuit t  Exhaust gas recirculation valve -N18- defective	t  No exhaust gas recirculation	–  Check exhaust gas recirculation valve -N18- → Chapter, final control diagnosis
		t  Wiring short to earth	t  Too much exhaust gas recirculation t  Reduced output, black smoke
17911 P1503
Load signal for alternator terminal DF
	Implausible signal	t  Alternator defective t  Voltage regulator defective t  Wiring open circuit	t  Engine preheating not functioning	–  Check alternator: → Current flow diagrams, Electrical fault finding and Fitting locations
17945 P1537
Fuel shut-off valve -N109-
	Malfunction	t  Defective, leaking or blocked fuel shut-off valve -N109-	t  Reduced performance t  Engine stops	–  Check fuel shut-off valve -N109- → Chapter, Final control diagnosis

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
17946 P1538
Fuel shut-off valve -N109-
	Open circuit/short to earth	t  Wire open circuit or wire has short to earth t  Defective fuel shut-off valve -N109-	t  Reduced performance t  Engine stops	–  Check fuel shut-off valve -N109- → Chapter, Final control diagnosis
17948 P1540
Vehicle speed signal
	Signal too large	t  Road speed more than 260 km/h t  Dash panel insert defective	t  Speedometer display not OK. t  Vehicle jerks when changing gear	–  Checking speed signal → Chapter

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
17969 P1561
Metering adjuster -N146-
	Control difference	t  Injection pump defective t  Open circuit or line short-circuit	t  Glow period warning lamp flashes t  Various running problems t  Engine stops	–  Check metering adjuster -N146- → Chapter
17970 P1562
Metering adjuster -N146-
	Upper stop value	–  Upper stop value reached –  Defective/blocked metering adjuster -N146-	–  Reduced performance –  Jerking	–  Check metering adjuster -N146- → Chapter
17971 P1563
Metering adjuster -N146-
	Lower stop value	–  Lower stop value reached –  Defective/blocked metering adjuster -N146-	–  Black smoke –  Rough idling	–  Check metering adjuster -N146- → Chapter

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
17978 P1570
Engine control unit locked		t  Start attempted with an unauthorised key t  Attempted manipulation t  Short circuit in communication wire t  Incorrect coding t  Fault in system for immobilizer t  Immobilizer control unit defective/missing t  Engine control unit renewed but has not been adapted to immobilizer.	t  Engine starts briefly and then stops again t  Glow period warning lamp flashes	–  Adapt engine control unit to electronic immobilizer → Chapter. –  Checking electronic immobilizer: → Electrical system; Rep. Gr.96

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
18008 P1600
Voltage supply terminal 15
	Voltage too low	t  No current supply when ignition is on (terminal 15)	t  Various running problems including engine will not start	–  Check voltage supply for diesel direct injection system control unit -J248- → Chapter
18009 P1601
Voltage supply relay - terminal 30 -J317-		t  Terminal 30 voltage supply relay -J317- defective t  Relay sticks (sporadically)	t  Engine will not start t  Various running problems including engine will not start	–  Check voltage supply for diesel direct injection system control unit -J248- → Chapter
18017 P1609
Crash shut-off triggered		t  Airbag triggered		→ Body self-diagnosis; Rep. Gr.01

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
18020 P1612
Engine control unit incorrectly coded
		t  Invalid control unit coding	t  Glow period warning lamp flashes	–  Code control unit → Chapter
18026 P1618
Glow plug relay -J52-
	Short to positive	t  Wire has short to positive t  Defective glow plug relay -J52-	t  No glow period t  Poor cold starting t  Glow period warning lamp -K29- flashes	–  Check glow plug relay -J52- → Chapter, Final control diagnosis
18027 P1619
Glow plug relay -J52-
	Open circuit/short to earth	t  Wire open circuit or wire has short to earth t  Defective glow plug relay -J52-	t  No glow period t  Poor cold starting t  Glow period warning lamp -K29- flashes	–  Check glow plug relay -J52- → Chapter, Final control diagnosis

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
18039 P1631
Accelerator position sender -G79-
	Signal too large	t  Defective accelerator position sender -G79-	t  Increased idling speed	–  Checking accelerator position sender -G79-: → Engine mechanical system; Rep. Gr.20
18040 P1632
Accelerator position sender -G79-
	Supply voltage	t  Wiring open circuit t  Operating voltage too high or too low	t  Glow period warning lamp flashes t  Increased idling speed	–  Checking accelerator position sender -G79-: → Engine mechanical system; Rep. Gr.20
18044 P1636
Powertrain data bus
	No message from ABS CU	t  Fault in data lines to airbag control unit		–  Check data bus → Chapter

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
18047 P1639
Accelerator position sender -G79- with accelerator position sender 2 -G185- → Note
	Implausible signal	t  Defective accelerator position sender -G79-	t  Increased idling speed	–  Checking accelerator position sender -G79-: → Engine mechanical system; Rep. Gr.20
18048 P1640
Control unit defective		t  Control unit internally defective	t  Various running problems t  Engine stops	–  Renew diesel direct injection system control unit -J248- → Chapter
18050 P1642
Please read out airbag CU fault memory		t  Fault in airbag system	t  Airbag warning lamp lights up	–  Interrogating airbag system fault memory: → Body self-diagnosis; Rep. Gr.01

1)  Incorrect fault text display. Correct display reads: Accelerator position sender -G79-, implausible signal

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
18056 P1648
Powertrain data bus
	Defective	t  Fault in data wire to ABS control unit t  Fault in ABS system	t  Various running problems (gear change jolts, load change jolts) t  No dynamic handling control t  No TCS function t  No EBC function	–  Check data bus → Chapter
18057 P1649
Powertrain data bus
	No message from ABS CU	t  Fault in data wire to ABS control unit	t  No dynamic handling control t  No TCS function t  No EBC function	–  Checking matching resistor for data bus → Chapter
18058 P1650
Powertrain data bus
	No message from instrument cluster	t  Fault in the data lines to instrument cluster		–  Checking matching resistor for data bus → Chapter

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
18065 P1657
Air conditioner input/output
	Short to positive	t  Short-circuit in line connection	t  Vehicle acceleration reduced when air conditioner is switched on	–  Checking AC compressor shut-off function → Chapter, final control diagnosis
18090 P1682
Powertrain data bus
	Implausible message from ABS CU	t  Fault in data wire to ABS control unit	t  No dynamic handling control t  No TCS function t  No EBC function	–  Checking matching resistor for data bus → Chapter

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
19459 P3003
Low heat output relay -J359-
	Short to positive	t  Wiring open circuit t  Short to positive t  Low heat output relay -J359- defective	t  Engine preheating not functioning	–  Checking low heat output relay -J359- → Chapter, Final control diagnosis
19461 P3005
High heat output relay -J360-
	Short to positive	t  Wiring open circuit t  Short to positive t  High heat output relay -J360- defective	t  Engine preheating not functioning	–  Checking high heat output relay -J360- → Chapter, Final control diagnosis

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
19560 P3104
Variable intake manifold flap change-over valve -N239-
	Short to positive	t  Short to positive	t  Harder engine stop jolts	–  Check variable intake manifold flap change-over valve -N239- → Chapter
19561 P3105
Variable intake manifold flap change-over valve -N239-
	Open circuit/short to earth	t  Wiring open circuit t  Variable intake manifold flap change-over valve defective	t  Harder engine stop jolts	–  Check variable intake manifold flap change-over valve -N239- → Chapter