Product categories

Opel Vectra – Two-Digit Codes

ECU Faults

Code Fault Description
12 Start of memory readout instruction
14 Coolant temperature sensor – voltage too low
15 Coolant temperature sensor – voltage too high
21 Throttle position sensor – voltage too high
22 Throttle position sensor – voltage too low
24 Distance sensor – no signal
33 Manifold pressure sensor – voltage too high
34 Manifold pressure sensor – voltage too low
35 Stepper motor – incorrect number of steps
42 No ignition signal pulses
47 Exhaust gas recirculation (EGR) valve
51 Control unit memory – fault
55 Control unit
62 Evaporative emissions circuit
63 EST-A wire (2/3) – voltage too low

Ignition System Errors

Code Fault Description
IGNITION SYSTEM – MOTRONIC
13 Lambda sensor – no variable voltage signal
14 Coolant temperature sensor – voltage too low
15 Coolant temperature sensor – voltage too high
48 Supply voltage too low
49 Supply voltage too high
65 Idle potentiometer – voltage too low
66 Idle potentiometer – voltage too high
73 Air flow meter – voltage too low
74 Air flow meter – voltage too high
75 Gear switch – voltage too low
ML4.1 SYSTEM until August 1989
35 Idle regulator – missing or incorrect idle speed regulation
44 Lambda sensor – mixture too lean
45 Lambda sensor – mixture too rich
46 Engine oil temperature sensor – voltage too low
47 Engine oil temperature sensor – voltage too high
51 Control unit memory – PROM failure
67 Throttle position sensor – idle switch does not open
69 Intake air temperature sensor – voltage too low
71 Intake air temperature sensor – voltage too high
72 Throttle position sensor – full load switch does not open
M1.5 SYSTEM from September 1989
16 Knock sensor – no voltage changes
18 Knock sensor – no signal for evaluation
19 Inductive sensor – incorrect engine speed signal
21 Throttle position sensor – voltage too high
22 Throttle position sensor – voltage too low
25 Injectors 1 and 2 – voltage too high
26 Injectors 3 and 4 – voltage too high
31 Inductive sensor – no engine speed signal
38 Lambda sensor – regulation voltage too high
39 Lambda sensor – regulation voltage too low
52 Engine warning light output – voltage too high
53 Fuel pump relay output – voltage too low
54 Fuel pump relay output – voltage too high
55 Control unit failure
56 Idle regulation output – voltage too high
57 Idle regulation output – voltage too low
61 Tank venting output – voltage too low
62 Tank venting output – voltage too high
81 Injectors 1 and 2 – voltage too low
82 Injectors 3 and 4 – voltage too low
93 HALL sensor – voltage too low
94 HALL sensor – voltage too high

Automatic Transmission Fault Codes

Code Fault Description
15 Coolant temperature sensor – short to ground
17 Solenoid valve MV 1 – short to ground
21 Load signal
22 Load signal
24 Output shaft speed sensor – faulty
25 Solenoid valve MV 1
26 Solenoid valve MV 2 – short to ground
28 Solenoid valve MV 2
29 Solenoid valve MV 3 – short to ground
31 Engine speed – no signal
32 Solenoid valve MV 4 – short to ground
33 Solenoid valve MV 4
36 Solenoid valve MV 3
38 Input signal sensor for transmission
41 Too large difference between input and output shaft speeds
47 Reverse gear lockout system – malfunction
48 Battery voltage too high
49 Battery voltage too low
56 Transmission does not engage 4th gear
67 Transmission oil temperature – no signal
75 Connection to engine – faulty
77 “Kick-down” switch – throttle position sensor
78 Creep time control

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