Opel/Vauxhall Fault Codes (Bosch Motronic 2.8)

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Note: This page may contain community-sourced information and/or data from manufacturer manuals. Descriptions, probable causes, and default actions can vary by year or ECU calibration and may include inaccuracies. Always verify using official manufacturer documentation or trusted service information.
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C20LET (Engine) — Bosch Motronic 2.7 / 2.8 Workshop list • Opel

Code	Description	Info
12	Start of diagnosis (blink preamble)	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
13	Oxygen sensor — No voltage change (open circuit)	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
14	Coolant temperature sensor — Voltage low	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
15	Coolant temperature sensor — Voltage high	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
16	Knock sensor circuit — No knock signal detected	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
18	Knock control module — Defective (replace unit)	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
19	Inductive pulse pick-up (crank sensor) — Incorrect engine speed signal	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
21	Throttle position sensor — Voltage high	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
22	Throttle position sensor — Voltage low	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
23	Knock control module — Defective (replace unit)	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
25	Injector valve cyl 1 — Voltage too high	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
26	Injector valve cyl 2 — Voltage too high	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
27	Injector valve cyl 3 — Voltage too high	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
28	Injector valve cyl 4 — Voltage too high	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
31	Inductive pulse pick-up — No engine speed signal	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
38	Oxygen sensor circuit — Voltage too low (lean)	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
39	Oxygen sensor circuit — Voltage too high (rich)	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
41	Recognition “–1 at gear” — Voltage too low	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
42	Recognition “–1 at gear” — Voltage too high	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
48	Alternator circuit — Voltage too low	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
49	Alternator circuit — Voltage too high	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
52	Engine telltales (final stage) — Voltage too high	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
55	Control unit defective — Replace ECU	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
56	Idle air control (final stage) — Voltage too high	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
57	Idle air control (final stage) — Voltage too low	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
61	Tank vent valve (final stage) — Voltage too low	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
62	Tank vent valve (final stage) — Voltage too high	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
69	Intake air temperature sensor — Voltage too low	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
71	Intake air temperature sensor — Voltage too high	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
73	Mass air flow meter — Voltage too low	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
74	Mass air flow meter — Voltage too high	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
75	Torque control — Voltage too low	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
82	Injector valve cyl 2 — Voltage too low	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
83	Injector valve cyl 3 — Voltage too low	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
84	Injector valve cyl 4 — Voltage too low	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
93	Hall sensor — Voltage too low	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
94	Hall sensor — Voltage too high	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
95	Hot start valve — Voltage too low	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
96	Hot start valve — Voltage too high	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
113	Charge control sensor — Standard tolerance too large	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
114	Charge control sensor — Idle range tolerance too large	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
115	Charge control sensor — Full-load range tolerance too large	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
116	Charge control sensor — Charge pressure too high	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
117	Charge pressure bypass valve — Voltage too low	↗ Source: Opel C20LET — Motronic 2.7 / 2.8
118	Charge pressure bypass valve — Voltage too high	↗ Source: Opel C20LET — Motronic 2.7 / 2.8

Four-Wheel Drive System (Transfer Box) Workshop list • Opel

Code	Description	Info
12	Start of diagnosis (blink preamble)	↗ Source: Opel 4×4 Transfer Box
15	Transfer box oil temperature sensor — Circuit interruption (open)	↗ Source: Opel 4×4 Transfer Box
31	Engine speed signal — Failure/incorrect (inductive pickup)	↗ Source: Opel 4×4 Transfer Box
32	Pressure switch — High pressure with 4×4 OFF	↗ Source: Opel 4×4 Transfer Box
33	Solenoid valve — Circuit interruption / voltage high	↗ Source: Opel 4×4 Transfer Box
34	Solenoid valve — Short to earth / voltage low	↗ Source: Opel 4×4 Transfer Box
37	Brake lamp switch — Continuous braking / logic fault	↗ Source: Opel 4×4 Transfer Box
39	ABS control unit — No front wheel speed signal (sensor/circuit)	↗ Source: Opel 4×4 Transfer Box
55	4×4 ECU — Internal fault (replace ECU)	↗ Source: Opel 4×4 Transfer Box
71	Brake lamp switch — Circuit interruption (voltage high)	↗ Source: Opel 4×4 Transfer Box
72	Brake lamp switch — Short to earth (voltage low)	↗ Source: Opel 4×4 Transfer Box
73	Brake lamp switch — Stop without braking (logic)	↗ Source: Opel 4×4 Transfer Box
74	Pressure switch — Low pressure with 4×4 ON	↗ Source: Opel 4×4 Transfer Box
75	Transfer box oil temperature — Voltage low / over-temperature	↗ Source: Opel 4×4 Transfer Box

Motronic 2.8 (C25XE) Workshop list • Bosch/Opel

Code	Description	Info
13	Oxygen/Lambda/O2 sensor — No change in voltage / open circuit	↗ Notes Check O2 sensor wiring and heater circuit. Source: Bosch Motronic 2.8 fault chart — Calibra V6 C25XE
14	Coolant Temperature Sensor (CTS) — Low voltage	↗ Source: Bosch Motronic 2.8 — C25XE
15	Coolant Temperature Sensor (CTS) — High voltage	↗ Source: Bosch Motronic 2.8 — C25XE
16	Knock sensor 1 (front bank) — No change in voltage (wiring/sensor)	↗ Source: Bosch Motronic 2.8 — C25XE
17	Knock sensor 2 (rear bank) — No change in voltage (wiring/sensor)	↗ Source: Bosch Motronic 2.8 — C25XE
18	Knock sensor fault in ECU — Internal knock processing problem	↗ Source: Bosch Motronic 2.8 — C25XE
19	RPM signal (crankshaft sensor) — Incorrect signal from inductive pickup	↗ Source: Bosch Motronic 2.8 — C25XE
21	Throttle Position Sensor — High voltage	↗ Source: Bosch Motronic 2.8 — C25XE
22	Throttle Position Sensor — Low voltage	↗ Source: Bosch Motronic 2.8 — C25XE
25	Injector valve 1 — High voltage	↗ Source: Bosch Motronic 2.8 — C25XE
26	Injector valve 2 — High voltage	↗ Source: Bosch Motronic 2.8 — C25XE
27	Injector valve 3 — High voltage	↗ Source: Bosch Motronic 2.8 — C25XE
28	Injector valve 4 — High voltage	↗ Source: Bosch Motronic 2.8 — C25XE
29	Injector valve 5 — High voltage	↗ Source: Bosch Motronic 2.8 — C25XE
31	Engine RPM (crank) — No signal (try reading codes with engine running)	↗ Source: Bosch Motronic 2.8 — C25XE
32	Injector valve 6 — High voltage	↗ Source: Bosch Motronic 2.8 — C25XE
38	Oxygen sensor — Voltage low (lean mixture detected)	↗ Source: Bosch Motronic 2.8 — C25XE
39	Oxygen sensor — Voltage high (rich mixture detected)	↗ Source: Bosch Motronic 2.8 — C25XE
44	Oxygen sensor — Lean exhaust	↗ Source: Bosch Motronic 2.8 — C25XE
45	Oxygen sensor — Rich exhaust	↗ Source: Bosch Motronic 2.8 — C25XE
46	Secondary Air Pump — Low voltage	↗ Source: Bosch Motronic 2.8 — C25XE
47	Secondary Air Pump — High voltage	↗ Source: Bosch Motronic 2.8 — C25XE
48	Battery voltage — Low voltage	↗ Source: Bosch Motronic 2.8 — C25XE
49	Battery voltage — High voltage	↗ Source: Bosch Motronic 2.8 — C25XE
52	Check Engine Light — High voltage	↗ Source: Bosch Motronic 2.8 — C25XE
53	Fuel pump relay — Low voltage	↗ Source: Bosch Motronic 2.8 — C25XE
54	Fuel pump relay — High voltage	↗ Source: Bosch Motronic 2.8 — C25XE
55	ECU fault — Renew ECU (internal fault)	↗ Source: Bosch Motronic 2.8 — C25XE
56	Idle Speed Control Valve (ISCV) — Low voltage	↗ Source: Bosch Motronic 2.8 — C25XE
57	Idle Speed Control Valve (ISCV) — High voltage	↗ Source: Bosch Motronic 2.8 — C25XE
61	Fuel Tank Vent Valve (FTVV) — Low voltage	↗ Source: Bosch Motronic 2.8 — C25XE
62	Fuel Tank Vent Valve (FTVV) — High voltage	↗ Source: Bosch Motronic 2.8 — C25XE
69	Intake air temperature — Low voltage	↗ Source: Bosch Motronic 2.8 — C25XE
71	Intake air temperature — High voltage	↗ Source: Bosch Motronic 2.8 — C25XE
73	Mass Air Flow (MAF) — Low voltage	↗ Source: Bosch Motronic 2.8 — C25XE
74	Mass Air Flow (MAF) — High voltage	↗ Source: Bosch Motronic 2.8 — C25XE
75	Transmission switch Torque Control — Automatic transmission only	↗ Source: Bosch Motronic 2.8 — C25XE
76	Continuous Torque Control — Automatic transmission only	↗ Source: Bosch Motronic 2.8 — C25XE
79	Full load inhibit (Traction Control) — Incorrect ignition/injector cut-off / voltage low	↗ Source: Bosch Motronic 2.8 — C25XE
81	Injector valve 1 — Low voltage	↗ Source: Bosch Motronic 2.8 — C25XE
82	Injector valve 2 — Low voltage	↗ Source: Bosch Motronic 2.8 — C25XE
83	Injector valve 3 — Low voltage	↗ Source: Bosch Motronic 2.8 — C25XE
84	Injector valve 4 — Low voltage	↗ Source: Bosch Motronic 2.8 — C25XE
85	Injector valve 5 — Low voltage	↗ Source: Bosch Motronic 2.8 — C25XE
86	Injector valve 6 — Low voltage	↗ Source: Bosch Motronic 2.8 — C25XE
87	Air Conditioning (A/C) cut-off relay — Low voltage	↗ Source: Bosch Motronic 2.8 — C25XE
88	Air Conditioning (A/C) cut-off relay — High voltage	↗ Source: Bosch Motronic 2.8 — C25XE
93	Hall Effect Switch (Camshaft Angle Sensor) — Low voltage	↗ Source: Bosch Motronic 2.8 — C25XE
94	Hall Effect Switch (Camshaft Angle Sensor) — High voltage	↗ Source: Bosch Motronic 2.8 — C25XE
97	Ignition/Injection cut-off (Traction Control) — High voltage	↗ Source: Bosch Motronic 2.8 — C25XE
143	Immobiliser function in ECU — No or incorrect signal	↗ Source: Bosch Motronic 2.8 — C25XE
144	Immobiliser — No signal received	↗ Source: Bosch Motronic 2.8 — C25XE
145	Immobiliser — Incorrect signal received (faulty unit or wiring)	↗ Source: Bosch Motronic 2.8 — C25XE

Notes