Maruti Suzuki Wagon R ECM Price, Part Numbers

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Maruti Suzuki Wagon R ECM Price, Part Numbers, Problems and Replacement Guide (2010–2025)

Maruti Suzuki Wagon R ECM Complete Information

The ECM (Engine Control Module) is the main computer of the Maruti Suzuki Wagon R. It controls fuel injection, ignition timing, fuel pump operation, idle speed, sensors, emission systems, and overall engine performance.

A faulty ECM can cause starting problems, fuel pump failure, immobilizer errors, engine misfiring, communication issues, and Check Engine Light problems.

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ECM Full Form

ECM = Engine Control Module

Also known as:

• ECU (Engine Control Unit)

• Engine Computer

• Engine Management System (EMS)

• Powertrain Control Module (PCM)

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Wagon R Models Covered

This guide covers:

Wagon R 2010–2018

• Wagon R 1.0

• K10B Engine

• Petrol

• LPG

• CNG

Wagon R 2019–2025

• K10B Engine

• K10C DualJet Engine

• K12N Engine

• Petrol

• CNG

• Manual

• AMT

The second-generation Wagon R launched in 2010 with the K10B engine, while the third-generation Wagon R arrived in 2019 with updated engine options.

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Maruti Suzuki Wagon R Used ECM Price

Used ECM prices depend on:

• Model year

• Engine type

• ECM manufacturer

• Immobilizer compatibility

• Part number condition

Used ECM Price

• ₹4,000 to ₹6,000 INR

Average market price:

• ₹5,000 INR

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Maruti Suzuki Wagon R New ECM Price

New ECM Price

• ₹8,000 to ₹11,000 INR

Some newer variants may cost more depending on:

• Engine type

• Software version

• CNG compatibility

• Availability

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Common Wagon R ECM Part Numbers

The following ECM part numbers are commonly found in Wagon R vehicles.

Older Wagon R (2010–2018)

• 33920M76M00

• 33920M76M10

• 33920M76M20

• 33920M76M30

Wagon R K10B Models

• 33920M67L00

• 33920M67L10

• 33920M67L20

Wagon R K10C DualJet Models

• 33920M79F20

• 33920M79F40

Wagon R K12N Models

• 33920M80T00

• 33920M80T10

Important:

Always match:

• Original part number

• Engine type

• Petrol or CNG variant

• Manual or AMT transmission

before purchasing an ECM.

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Common Symptoms of a Faulty ECM

Engine Cranking But Not Starting

Symptoms

• Starter motor operates normally

• Engine cranks

• Vehicle does not start

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Check Engine Light Not Coming ON

Symptoms

• Ignition ON

• Check Engine Light does not illuminate

This often indicates ECM power or internal failure.

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Fuel Pump Not Working

Symptoms

• No fuel pump sound

• No fuel pressure

• Engine cranks but does not start

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Engine Misfiring

Symptoms

• Rough idle

• Poor acceleration

• Engine vibration

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Engine Missing Under Load

Symptoms

• Power loss

• Hesitation

• Jerking while driving

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Immobilizer Error

Symptoms

• Security light flashing

• Engine starts and stalls

• No-start condition

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Scanner Cannot Communicate With ECM

Symptoms

• No communication message

• Multiple network faults

• Live data unavailable

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How To Confirm ECM Failure

Before replacing the ECM, check:

ECM Fuse

Inspect all engine control fuses.

Main Relay

Verify proper operation.

Battery Voltage

Low voltage can cause ECM communication failure.

Ground Circuit

Poor grounding can create false ECM symptoms.

Wiring Harness

Inspect for:

• Water damage

• Corrosion

• Loose connectors

• Broken wires

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Can a Used ECM Be Installed?

Yes.

However, some Wagon R models require:

• Immobilizer matching

• Key programming

• ECU coding

• ECM adaptation

after installation.

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Common Causes of ECM Failure

• Battery reverse polarity

• Water entering ECM

• Alternator overcharging

• Wiring short circuit

• Improper jump-starting

• Connector corrosion

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How To Increase ECM Life

• Maintain battery health

• Repair charging system faults quickly

• Keep ECM connectors dry

• Avoid reverse battery connection

• Use proper jump-start procedures

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Conclusion

The Maruti Suzuki Wagon R ECM (Engine Control Module) controls fuel injection, ignition timing, fuel pump operation, emissions systems, and engine management. A faulty ECM can cause engine cranking but not starting, fuel pump failure, immobilizer problems, engine misfiring, and communication faults.

The average used Wagon R ECM price ranges from ₹4,000 to ₹6,000 INR, while a new ECM generally costs between ₹8,000 and ₹11,000 INR. Before replacing the ECM, always verify the exact part number, engine type, and immobilizer compatibility to ensure a successful repair.

• Model year
• K10B / K10C / K12M / K12N engine
• Petrol or CNG
• Manual or AMT
• Emission standard (BS3, BS4, BS6)

Even Maruti's parts catalog contains hundreds of ECU/ECM variants.

However, here is a practical workshop reference list of commonly seen Wagon R ECM part numbers:

Wagon R Model	Engine	Common ECM Part Numbers
Wagon R 2010-2013	K10B	33920M67K40, 33920M67K41
Wagon R 2013-2018	K10B	33920M67LC1, 33920M67LE, 33920M67L00
Wagon R CNG	K10B CNG	33950M76M10, 33950M77PB0
Wagon R 2019-2021	K10B	33920M67LA2
Wagon R 1.2	K12M	33920M79F00, 33920M79F10
Wagon R 2022-2025	K10C  DualJet	33920M79F20, 33920M79F40
Wagon R 2022-2025	K12N DualJet	33920M80T00, 33920M80T10