Master Blink Code List

4 Digit Blink Codes:

The following list has been compiled from many blink code tables and lists most of the malfunctions which can be displayed from Electronic Control Units. These blink codes can be displayed using Scan Tools, LED testers, or the Malfunction Indicator Lamp (MIL) on the instrument panel.  Scan Tools such as the VAG 1551 or the VAG 1552 will also display a DTC or Diagnostic Trouble Code. I've listed some 5 digit codes. These are DTC codes read with the scan tools.

See section on Fault Code Reading. (Under Construction)

There are more blink codes in this list than your individual computer knows about. If a 4 Digit Blink Code comes up with your testing check this list for possible faults,  don't worry about the blink codes that are listed but don't come up as possible faults.

0000

No malfunction recognized

Indicated by one pulse of the light every 15 seconds or so

If there is a malfunction or complaint; the malfunction fault is not recognized by On Board Diagnostics

End of Diagnostic Output

1111

Engine Control Module (ECM/ECU)

Transmission Control Module (TCM)

Electrical interferences from outside sources

ECU is malfunctioning

Poor ground connections to the computer

Defective memory circuits in the control unit

Bad checksum in computer chip from a tuner or a tuner’s scrambler

1113

Transmission Solenoid Valve 1

1121

Transmission Solenoid Valve 2

1123

Transmission Solenoid Valve 3

1124

Transmission Mechanical/Hydraulic fault

Defective clutch or valve body

1131

Transmission Solenoid Valve 4

1133

Transmission Solenoid Valve 5

1141

Transmission Solenoid Valve 6

1143

Transmission Solenoid Valve 7

1231

Vehicle Speed Sensor (VSS) (G 68)

No change in signal or mechanical malfunction

Open circuit or short circuit from vehicle speed sensor

1314

Multi-Function Switch (F 125)

1323

Kickdown switch (F 8)

1332

Trans-program switch (E 122)

1333

Transmission oil temp sender (G93)

2111

Engine speed sensor (G 28)

No change in signal or mechanical malfunction

Mounting base of G28 loose

Distance from G28 to ring gear greater than 3/64 inch

Broken teeth on flywheel ring gear

G28 RPM sensor malfunctioning

Open or short circuit

Defective sensor & cables, metal fragments on flywheel teeth

Debris on G28

Connector on G28 swapped with connector on G4.

ECM malfunctioning

2112

Crankshaft Position Sensor (CKP) (G 4)

No change in signal or mechanical malfunction

Sensor is not detecting flywheel pin

Flywheel pin damaged or missing,

Sensor in not installed correctly

Distributor hall sensor out of adjustment

2113

Camshaft Position Sensor (G 40)

No change in signal

Open circuit or short circuit to positive

Signal to positive

Short circuit to ground

Signal to ground

Mechanical malfunction, hall sender defective

Faulty basic setting, or distributor alignment

Cambelt has jumped a tooth

If 1551/1552 Shows sporadic disregard

2114

Hall Sensor (G 40)

Hall sensor not at reference mark

2121

Closed throttle position switch (CTP) (F 60)

Usually Part of Idle/Full Throttle Switch Assembly

Throttle body sticking

Floor mat presses on accelerator pedal

Throttle cable adjustment

Switch stuck open or closed

Internal solder connections poor or broken or contacts contaminated

Wiring broken or shorted

Moisture in throttle body connector

2122

Engine speed signal missing

2123

Full Throttle Switch

Part of Idle/Full Throttle Switch Assembly

Switch stuck open or closed

Internal solder connections poor or broken or contacts contaminated

Wiring broken or shorted

2131

Brake Light Switch

Open circuit

2141

First Knock Regulation (00535)

Second Knock Regulation (00536)

00577 Cyl 1

00578 Cyl 2

No change in signal

Maximum control limit exceeded

ECU cannot control excessive knock

Timing has been retarded to maximum

Low boost on 20V

Excessive boost, Fuel octane too low, Compression to high

2142

Knock Sensor (KS) #1 (G 61)

Open or short circuit, Defective sensor

Check sensor and wiring

Symptom: Timing retarded, High fuel consumption, power loss, Boost pressure not attained

2143

Dual knock sensor engines

Knock sensor II

00579 Cyl 3

00580 Cyl 4

00581 Cyl 5

00582 Cyl 6

#2, (Cylinders 3, 4, 5)

Excessive knock, timing is being retarded by maximum amount 7.8 degrees.

Fuel octane too low, Excessive Compression, excessive boost

2144

Knock Sensor (KS) II (G 66)

Open or short circuit,

Defective sensor or wiring

Symptom: Timing retarded, High fuel consumption, power loss, Boost pressure not attained

2212

Throttle Position (TP) Sensor (G 69)

Open circuit short to positive in sensor

Short to ground in sensor or wires between sensor and computer

Signal outside tolerance range

Signal too high from computer malfunction

Signal too low from dampness and/or corrosion at sensor connector

Impossible signal

2214

RPM exceeds maximum programmed

Engine has exceeded rev limit due to improper shifting

Example 7440 on AAN & 3B engines or 6793 for ABH engine

2221

Manifold Pressure Sensing

Hose to ECU detached, leaking, pinched, or plugged

Pressure is too low, too high, or not correct for mass of air metered.

Symptom: Loss of Power

2222

Manifold Absolute Pressure Sensor (G 71)

Located in the ECU

Hose between intake manifold and ECM open, pinched, plugged or bent

Fluid separator in the hose between manifold and ECM full of fluid

Wastegate valve malfunctioning

Wastegate frequency valve malfunctioning

Pressure sensor in the ECM is malfunctioning

Turbocharger in malfunctioning

Repair or replace ECU

2223

Barometric Pressure Sensor ( F 96)

2224

Over boost condition (1989-91 200TQ, 1989-91 200T)

UK MB engine.

Boost pressure exceeded 1.6 bar for MC, 1.8 bar for MB

Waste gate or pressure hose, Waste Gate Solenoid/hose problem

2231

Idle speed regulation

Idle Air Control valve (N 71) binds when closed

Mass Air Flow Sensor (G 70) offset

Resistance at terminal connector of (N 71)

Idle Air Control valve (N 71) binds when open

Air leak between Mass Air Flow Sensor (G 70) and Idle Air Control valve (N 71)

2234

Supply voltage to ECM

Greater than 16 volts

Lower than 6 volts

Defective battery

Battery discharged

Alternator malfunctioning

Engine was started with two batteries in series

Poor Ground for ECM

Current drain with ignition off

2242

CO Fuel Trim Potentiometer (G74)

2312

Engine Coolant Temperature (ECT) Sensor (G 62)

Open circuit to ECM

Short to ground

Moisture in (G 62) connector

Resistance between sensor and ECM

Malfunctioning sensor

(G 62) input circuit in ECM malfunctioning

Symptom: Cold starting difficulties at low temperatures, Poor idle and acceleration during warm up

2314

Engine/Transmission electrical connection

Signal to negative

Open circuit

Short between valve wires

2322

Inlet Air Temp (IAT) Sensor (G 42)

Short circuit to ground

Open circuit between (G 42) and ECM

Malfunctioning sensor

(G 42) input circuit in ECM malfunctioning

Symptom: Slight power loss, Increase in fuel consumption

2324

Mass Air Flow (MAF) Sensor (G 70)

Signal too low

Signal too high

Engine Control Module (ECM) defective

2341

Heated Oxygen Sensor (OS2) (G 39)

Maximum control limit exceeded

Fuel tank less than 2.5 gallons reducing fuel pressure

2342

Heated Oxygen Sensor

Defective Sensor or Wiring to sensor defective

Resistance Heater in probe faulty

Symptom: Emissions not within specifications

2411

EGR Temperature Sensor (00585)

Exhaust Gas Recirculation (EGR) (00586)

2413

Mixture Adaptation

Exceeded or Undershot adaptation limit (multiplicative)

Exceeded or Undershot adaptation limit (additive)

4312

Exhaust Gas Recirculation valve (N 18)

4314

Selector lever lock solenoid (N 110)

4332

Ignition output

00609 output 1

00610 output 2

00611 output 3

4333

Intake Manifold Changeover Valve (N156)

4343

Evaporative Emission (EVAP) Canister Purge Valve (N 80)

Signal to positive

Signal to negative

4434

Oxygen Sensor probe heating

4411

Fuel Injector Cyl 1 or 1 & 5

4412

Fuel Injector Cyl 2 or 2 & 7

4413

Fuel Injector Cyl 3 or 3 & 6

4414

Fuel Injector Cyl 4 or 4 & 8

4421

Fuel Injector Cyl 5

4422

Fuel Injector Cyl 6

4431

Idle Air Control (IAC) valve (N71)

Air leak in intake air system

2nd stage of Throttle Body does not close

4442

Wastegate Bypass Regulator Valve (N 75)

4444

No Faults have been recorded in the ECU's memory.

This does not mean that there may not be a problem

Just that the computer is unaware of the problem.

INTENDED ACCELERATION ^®

© Copyright 1997-2000 by Ned Ritchie