P1346

Code

BMW P — Powertrain

Misfire During Start Cylinder 3

Brand: BMW

Type: P — Powertrain

Views: UK: 19 EN: 36 RU: 29

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty ignition coil on cylinder 3
Worn or fouled spark plug in cylinder 3
Fuel injector clogged, leaking, or electrically faulty on cylinder 3
Low cylinder compression (mechanical issue: valves, piston rings, head gasket)
Fuel delivery problem (low rail pressure or injector feed issue)
Crank or cam position sensor/timing issue affecting cylinder 3 during start

Symptoms

Rough cranking or rough engine during first seconds after start
Longer cranking or hard starting
Check Engine / malfunction indicator lamp (MIL) illuminated
Possible engine stumble or reduced power immediately after start
Misfire counts or cylinder-specific misfire detected in scan tool data

What to check

Read freeze frame and misfire counters with a capable scan tool (look at cranking RPM and cylinder-specific misfire counts)
Inspect spark plug condition and gap for cylinder 3
Measure coil primary/secondary signals or swap coil with another cylinder to see if fault follows
Swap or activate injector to verify operation or swap injector to see if code follows
Check injector resistance and connector for corrosion or poor contact
Perform a relative compression or cranking compression check on cylinder 3 and compare to others

Signal parameters

Cylinder 3 ignition coil primary voltage during cranking (presence of switching pulses)
Injector pulse width / injector command on cylinder 3 during cranking
Misfire counter / cylinder-specific misfire rate (cranking vs idle)
Crankshaft RPM trace during start (irregular RPM indicates misfire)
Relative compression or cranking compression values for cylinder 3 vs others
Fuel rail pressure during cranking and start (within factory spec)

Diagnostic algorithm

Retrieve all stored codes and freeze-frame data; record misfire counts and conditions (crank RPM, temperature).
Clear codes, attempt to re-create the fault under the same start conditions. Observe live data during cranking (misfire counters, injector duty, coil command).
Visually inspect spark plug, ignition coil boot, and coil electrical connector on cylinder 3 for damage, oil, or corrosion. Replace the spark plug if fouled or aged.
Swap the ignition coil from cylinder 3 with another cylinder. If the misfire follows the coil, replace the coil.
Swap or bench-test the injector from cylinder 3 (listen for click, check resistance, use a noid light or oscilloscope). If the misfire follows the injector, replace or service the injector.
Check wiring and ground continuity for coil and injector circuits (wiggle test with engine cranking). Repair any damaged wires or poor grounds.
Measure fuel rail pressure and verify adequate fuel delivery during cranking/start. Address low pressure (fuel pump, filter, pressure regulator) if out of spec.
Perform a compression or leak-down test on cylinder 3 and compare to other cylinders. If compression is low, inspect for valve issues, head gasket failure, or piston/ring wear.
Verify crank and cam position sensor signals and timing (including VANOS/variable timing if applicable). Correct timing or sensor faults as required.
After repairs, clear codes and verify multiple cold/hot starts to ensure the misfire does not return. If intermittent, capture detailed data or use a scope during cranking.

Likely causes

Ignition coil or spark plug failure on cylinder 3 (most common)
Faulty or clogged fuel injector for cylinder 3
Wiring/connectors to coil or injector (corrosion, loose, broken)
Low compression on cylinder 3 (mechanical) if electrical and fuel checks pass

Fault status

⚠️ Status

Cylinder 3 misfire detected during engine start/cranking. ECM logged a cylinder-specific misfire event for cylinder 3.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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Code

P1346

BUICK P — Powertrain

Intake Camshaft Position (CMP) Sensor System Performance

Brand: BUICK

Type: P — Powertrain

Views: UK: 19 EN: 32 RU: 26

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty ignition coil on cylinder 3
Worn or fouled spark plug in cylinder 3
Fuel injector clogged, leaking, or electrically faulty on cylinder 3
Low cylinder compression (mechanical issue: valves, piston rings, head gasket)
Fuel delivery problem (low rail pressure or injector feed issue)
Crank or cam position sensor/timing issue affecting cylinder 3 during start

Symptoms

Rough cranking or rough engine during first seconds after start
Longer cranking or hard starting
Check Engine / malfunction indicator lamp (MIL) illuminated
Possible engine stumble or reduced power immediately after start
Misfire counts or cylinder-specific misfire detected in scan tool data

What to check

Read freeze frame and misfire counters with a capable scan tool (look at cranking RPM and cylinder-specific misfire counts)
Inspect spark plug condition and gap for cylinder 3
Measure coil primary/secondary signals or swap coil with another cylinder to see if fault follows
Swap or activate injector to verify operation or swap injector to see if code follows
Check injector resistance and connector for corrosion or poor contact
Perform a relative compression or cranking compression check on cylinder 3 and compare to others

Signal parameters

Cylinder 3 ignition coil primary voltage during cranking (presence of switching pulses)
Injector pulse width / injector command on cylinder 3 during cranking
Misfire counter / cylinder-specific misfire rate (cranking vs idle)
Crankshaft RPM trace during start (irregular RPM indicates misfire)
Relative compression or cranking compression values for cylinder 3 vs others
Fuel rail pressure during cranking and start (within factory spec)

Diagnostic algorithm

Retrieve all stored codes and freeze-frame data; record misfire counts and conditions (crank RPM, temperature).
Clear codes, attempt to re-create the fault under the same start conditions. Observe live data during cranking (misfire counters, injector duty, coil command).
Visually inspect spark plug, ignition coil boot, and coil electrical connector on cylinder 3 for damage, oil, or corrosion. Replace the spark plug if fouled or aged.
Swap the ignition coil from cylinder 3 with another cylinder. If the misfire follows the coil, replace the coil.
Swap or bench-test the injector from cylinder 3 (listen for click, check resistance, use a noid light or oscilloscope). If the misfire follows the injector, replace or service the injector.
Check wiring and ground continuity for coil and injector circuits (wiggle test with engine cranking). Repair any damaged wires or poor grounds.
Measure fuel rail pressure and verify adequate fuel delivery during cranking/start. Address low pressure (fuel pump, filter, pressure regulator) if out of spec.
Perform a compression or leak-down test on cylinder 3 and compare to other cylinders. If compression is low, inspect for valve issues, head gasket failure, or piston/ring wear.
Verify crank and cam position sensor signals and timing (including VANOS/variable timing if applicable). Correct timing or sensor faults as required.
After repairs, clear codes and verify multiple cold/hot starts to ensure the misfire does not return. If intermittent, capture detailed data or use a scope during cranking.

Likely causes

Ignition coil or spark plug failure on cylinder 3 (most common)
Faulty or clogged fuel injector for cylinder 3
Wiring/connectors to coil or injector (corrosion, loose, broken)
Low compression on cylinder 3 (mechanical) if electrical and fuel checks pass

Fault status

⚠️ Status

Cylinder 3 misfire detected during engine start/cranking. ECM logged a cylinder-specific misfire event for cylinder 3.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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Code

P1346

CADILLAC P — Powertrain

Intake Camshaft Position (CMP) Sensor System Performance

Brand: CADILLAC

Type: P — Powertrain

Views: UK: 22 EN: 40 RU: 31

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty ignition coil on cylinder 3
Worn or fouled spark plug in cylinder 3
Fuel injector clogged, leaking, or electrically faulty on cylinder 3
Low cylinder compression (mechanical issue: valves, piston rings, head gasket)
Fuel delivery problem (low rail pressure or injector feed issue)
Crank or cam position sensor/timing issue affecting cylinder 3 during start

Symptoms

Rough cranking or rough engine during first seconds after start
Longer cranking or hard starting
Check Engine / malfunction indicator lamp (MIL) illuminated
Possible engine stumble or reduced power immediately after start
Misfire counts or cylinder-specific misfire detected in scan tool data

What to check

Read freeze frame and misfire counters with a capable scan tool (look at cranking RPM and cylinder-specific misfire counts)
Inspect spark plug condition and gap for cylinder 3
Measure coil primary/secondary signals or swap coil with another cylinder to see if fault follows
Swap or activate injector to verify operation or swap injector to see if code follows
Check injector resistance and connector for corrosion or poor contact
Perform a relative compression or cranking compression check on cylinder 3 and compare to others

Signal parameters

Cylinder 3 ignition coil primary voltage during cranking (presence of switching pulses)
Injector pulse width / injector command on cylinder 3 during cranking
Misfire counter / cylinder-specific misfire rate (cranking vs idle)
Crankshaft RPM trace during start (irregular RPM indicates misfire)
Relative compression or cranking compression values for cylinder 3 vs others
Fuel rail pressure during cranking and start (within factory spec)

Diagnostic algorithm

Retrieve all stored codes and freeze-frame data; record misfire counts and conditions (crank RPM, temperature).
Clear codes, attempt to re-create the fault under the same start conditions. Observe live data during cranking (misfire counters, injector duty, coil command).
Visually inspect spark plug, ignition coil boot, and coil electrical connector on cylinder 3 for damage, oil, or corrosion. Replace the spark plug if fouled or aged.
Swap the ignition coil from cylinder 3 with another cylinder. If the misfire follows the coil, replace the coil.
Swap or bench-test the injector from cylinder 3 (listen for click, check resistance, use a noid light or oscilloscope). If the misfire follows the injector, replace or service the injector.
Check wiring and ground continuity for coil and injector circuits (wiggle test with engine cranking). Repair any damaged wires or poor grounds.
Measure fuel rail pressure and verify adequate fuel delivery during cranking/start. Address low pressure (fuel pump, filter, pressure regulator) if out of spec.
Perform a compression or leak-down test on cylinder 3 and compare to other cylinders. If compression is low, inspect for valve issues, head gasket failure, or piston/ring wear.
Verify crank and cam position sensor signals and timing (including VANOS/variable timing if applicable). Correct timing or sensor faults as required.
After repairs, clear codes and verify multiple cold/hot starts to ensure the misfire does not return. If intermittent, capture detailed data or use a scope during cranking.

Likely causes

Ignition coil or spark plug failure on cylinder 3 (most common)
Faulty or clogged fuel injector for cylinder 3
Wiring/connectors to coil or injector (corrosion, loose, broken)
Low compression on cylinder 3 (mechanical) if electrical and fuel checks pass

Fault status

⚠️ Status

Cylinder 3 misfire detected during engine start/cranking. ECM logged a cylinder-specific misfire event for cylinder 3.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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Code

P1346

CHEVROLET P — Powertrain

Intake Camshaft Position (CMP) Sensor System Performance

Brand: CHEVROLET

Type: P — Powertrain

Views: UK: 20 EN: 32 RU: 27

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty ignition coil on cylinder 3
Worn or fouled spark plug in cylinder 3
Fuel injector clogged, leaking, or electrically faulty on cylinder 3
Low cylinder compression (mechanical issue: valves, piston rings, head gasket)
Fuel delivery problem (low rail pressure or injector feed issue)
Crank or cam position sensor/timing issue affecting cylinder 3 during start

Symptoms

Rough cranking or rough engine during first seconds after start
Longer cranking or hard starting
Check Engine / malfunction indicator lamp (MIL) illuminated
Possible engine stumble or reduced power immediately after start
Misfire counts or cylinder-specific misfire detected in scan tool data

What to check

Read freeze frame and misfire counters with a capable scan tool (look at cranking RPM and cylinder-specific misfire counts)
Inspect spark plug condition and gap for cylinder 3
Measure coil primary/secondary signals or swap coil with another cylinder to see if fault follows
Swap or activate injector to verify operation or swap injector to see if code follows
Check injector resistance and connector for corrosion or poor contact
Perform a relative compression or cranking compression check on cylinder 3 and compare to others

Signal parameters

Cylinder 3 ignition coil primary voltage during cranking (presence of switching pulses)
Injector pulse width / injector command on cylinder 3 during cranking
Misfire counter / cylinder-specific misfire rate (cranking vs idle)
Crankshaft RPM trace during start (irregular RPM indicates misfire)
Relative compression or cranking compression values for cylinder 3 vs others
Fuel rail pressure during cranking and start (within factory spec)

Diagnostic algorithm

Retrieve all stored codes and freeze-frame data; record misfire counts and conditions (crank RPM, temperature).
Clear codes, attempt to re-create the fault under the same start conditions. Observe live data during cranking (misfire counters, injector duty, coil command).
Visually inspect spark plug, ignition coil boot, and coil electrical connector on cylinder 3 for damage, oil, or corrosion. Replace the spark plug if fouled or aged.
Swap the ignition coil from cylinder 3 with another cylinder. If the misfire follows the coil, replace the coil.
Swap or bench-test the injector from cylinder 3 (listen for click, check resistance, use a noid light or oscilloscope). If the misfire follows the injector, replace or service the injector.
Check wiring and ground continuity for coil and injector circuits (wiggle test with engine cranking). Repair any damaged wires or poor grounds.
Measure fuel rail pressure and verify adequate fuel delivery during cranking/start. Address low pressure (fuel pump, filter, pressure regulator) if out of spec.
Perform a compression or leak-down test on cylinder 3 and compare to other cylinders. If compression is low, inspect for valve issues, head gasket failure, or piston/ring wear.
Verify crank and cam position sensor signals and timing (including VANOS/variable timing if applicable). Correct timing or sensor faults as required.
After repairs, clear codes and verify multiple cold/hot starts to ensure the misfire does not return. If intermittent, capture detailed data or use a scope during cranking.

Likely causes

Ignition coil or spark plug failure on cylinder 3 (most common)
Faulty or clogged fuel injector for cylinder 3
Wiring/connectors to coil or injector (corrosion, loose, broken)
Low compression on cylinder 3 (mechanical) if electrical and fuel checks pass

Fault status

⚠️ Status

Cylinder 3 misfire detected during engine start/cranking. ECM logged a cylinder-specific misfire event for cylinder 3.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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Code

P1346

CHRYSLER P — Powertrain

Intake Camshaft Position (CMP) Sensor System Performance

Brand: CHRYSLER

Type: P — Powertrain

Views: UK: 22 EN: 34 RU: 29

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty ignition coil on cylinder 3
Worn or fouled spark plug in cylinder 3
Fuel injector clogged, leaking, or electrically faulty on cylinder 3
Low cylinder compression (mechanical issue: valves, piston rings, head gasket)
Fuel delivery problem (low rail pressure or injector feed issue)
Crank or cam position sensor/timing issue affecting cylinder 3 during start

Symptoms

Rough cranking or rough engine during first seconds after start
Longer cranking or hard starting
Check Engine / malfunction indicator lamp (MIL) illuminated
Possible engine stumble or reduced power immediately after start
Misfire counts or cylinder-specific misfire detected in scan tool data

What to check

Read freeze frame and misfire counters with a capable scan tool (look at cranking RPM and cylinder-specific misfire counts)
Inspect spark plug condition and gap for cylinder 3
Measure coil primary/secondary signals or swap coil with another cylinder to see if fault follows
Swap or activate injector to verify operation or swap injector to see if code follows
Check injector resistance and connector for corrosion or poor contact
Perform a relative compression or cranking compression check on cylinder 3 and compare to others

Signal parameters

Cylinder 3 ignition coil primary voltage during cranking (presence of switching pulses)
Injector pulse width / injector command on cylinder 3 during cranking
Misfire counter / cylinder-specific misfire rate (cranking vs idle)
Crankshaft RPM trace during start (irregular RPM indicates misfire)
Relative compression or cranking compression values for cylinder 3 vs others
Fuel rail pressure during cranking and start (within factory spec)

Diagnostic algorithm

Retrieve all stored codes and freeze-frame data; record misfire counts and conditions (crank RPM, temperature).
Clear codes, attempt to re-create the fault under the same start conditions. Observe live data during cranking (misfire counters, injector duty, coil command).
Visually inspect spark plug, ignition coil boot, and coil electrical connector on cylinder 3 for damage, oil, or corrosion. Replace the spark plug if fouled or aged.
Swap the ignition coil from cylinder 3 with another cylinder. If the misfire follows the coil, replace the coil.
Swap or bench-test the injector from cylinder 3 (listen for click, check resistance, use a noid light or oscilloscope). If the misfire follows the injector, replace or service the injector.
Check wiring and ground continuity for coil and injector circuits (wiggle test with engine cranking). Repair any damaged wires or poor grounds.
Measure fuel rail pressure and verify adequate fuel delivery during cranking/start. Address low pressure (fuel pump, filter, pressure regulator) if out of spec.
Perform a compression or leak-down test on cylinder 3 and compare to other cylinders. If compression is low, inspect for valve issues, head gasket failure, or piston/ring wear.
Verify crank and cam position sensor signals and timing (including VANOS/variable timing if applicable). Correct timing or sensor faults as required.
After repairs, clear codes and verify multiple cold/hot starts to ensure the misfire does not return. If intermittent, capture detailed data or use a scope during cranking.

Likely causes

Ignition coil or spark plug failure on cylinder 3 (most common)
Faulty or clogged fuel injector for cylinder 3
Wiring/connectors to coil or injector (corrosion, loose, broken)
Low compression on cylinder 3 (mechanical) if electrical and fuel checks pass

Fault status

⚠️ Status

Cylinder 3 misfire detected during engine start/cranking. ECM logged a cylinder-specific misfire event for cylinder 3.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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Code

P1346

DAEWOO P — Powertrain

#6 ION CIRCUIT

Brand: DAEWOO

Type: P — Powertrain

Views: UK: 2 EN: 5 RU: 5

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty ignition coil on cylinder 3
Worn or fouled spark plug in cylinder 3
Fuel injector clogged, leaking, or electrically faulty on cylinder 3
Low cylinder compression (mechanical issue: valves, piston rings, head gasket)
Fuel delivery problem (low rail pressure or injector feed issue)
Crank or cam position sensor/timing issue affecting cylinder 3 during start

Symptoms

Rough cranking or rough engine during first seconds after start
Longer cranking or hard starting
Check Engine / malfunction indicator lamp (MIL) illuminated
Possible engine stumble or reduced power immediately after start
Misfire counts or cylinder-specific misfire detected in scan tool data

What to check

Read freeze frame and misfire counters with a capable scan tool (look at cranking RPM and cylinder-specific misfire counts)
Inspect spark plug condition and gap for cylinder 3
Measure coil primary/secondary signals or swap coil with another cylinder to see if fault follows
Swap or activate injector to verify operation or swap injector to see if code follows
Check injector resistance and connector for corrosion or poor contact
Perform a relative compression or cranking compression check on cylinder 3 and compare to others

Signal parameters

Cylinder 3 ignition coil primary voltage during cranking (presence of switching pulses)
Injector pulse width / injector command on cylinder 3 during cranking
Misfire counter / cylinder-specific misfire rate (cranking vs idle)
Crankshaft RPM trace during start (irregular RPM indicates misfire)
Relative compression or cranking compression values for cylinder 3 vs others
Fuel rail pressure during cranking and start (within factory spec)

Diagnostic algorithm

Retrieve all stored codes and freeze-frame data; record misfire counts and conditions (crank RPM, temperature).
Clear codes, attempt to re-create the fault under the same start conditions. Observe live data during cranking (misfire counters, injector duty, coil command).
Visually inspect spark plug, ignition coil boot, and coil electrical connector on cylinder 3 for damage, oil, or corrosion. Replace the spark plug if fouled or aged.
Swap the ignition coil from cylinder 3 with another cylinder. If the misfire follows the coil, replace the coil.
Swap or bench-test the injector from cylinder 3 (listen for click, check resistance, use a noid light or oscilloscope). If the misfire follows the injector, replace or service the injector.
Check wiring and ground continuity for coil and injector circuits (wiggle test with engine cranking). Repair any damaged wires or poor grounds.
Measure fuel rail pressure and verify adequate fuel delivery during cranking/start. Address low pressure (fuel pump, filter, pressure regulator) if out of spec.
Perform a compression or leak-down test on cylinder 3 and compare to other cylinders. If compression is low, inspect for valve issues, head gasket failure, or piston/ring wear.
Verify crank and cam position sensor signals and timing (including VANOS/variable timing if applicable). Correct timing or sensor faults as required.
After repairs, clear codes and verify multiple cold/hot starts to ensure the misfire does not return. If intermittent, capture detailed data or use a scope during cranking.

Likely causes

Ignition coil or spark plug failure on cylinder 3 (most common)
Faulty or clogged fuel injector for cylinder 3
Wiring/connectors to coil or injector (corrosion, loose, broken)
Low compression on cylinder 3 (mechanical) if electrical and fuel checks pass

Fault status

⚠️ Status

Cylinder 3 misfire detected during engine start/cranking. ECM logged a cylinder-specific misfire event for cylinder 3.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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Code

P1346

DAIHATSU P — Powertrain

VVT control (valve timing fail)

Brand: DAIHATSU

Type: P — Powertrain

Views: UK: 4 EN: 7 RU: 3

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty ignition coil on cylinder 3
Worn or fouled spark plug in cylinder 3
Fuel injector clogged, leaking, or electrically faulty on cylinder 3
Low cylinder compression (mechanical issue: valves, piston rings, head gasket)
Fuel delivery problem (low rail pressure or injector feed issue)
Crank or cam position sensor/timing issue affecting cylinder 3 during start

Symptoms

Rough cranking or rough engine during first seconds after start
Longer cranking or hard starting
Check Engine / malfunction indicator lamp (MIL) illuminated
Possible engine stumble or reduced power immediately after start
Misfire counts or cylinder-specific misfire detected in scan tool data

What to check

Read freeze frame and misfire counters with a capable scan tool (look at cranking RPM and cylinder-specific misfire counts)
Inspect spark plug condition and gap for cylinder 3
Measure coil primary/secondary signals or swap coil with another cylinder to see if fault follows
Swap or activate injector to verify operation or swap injector to see if code follows
Check injector resistance and connector for corrosion or poor contact
Perform a relative compression or cranking compression check on cylinder 3 and compare to others

Signal parameters

Cylinder 3 ignition coil primary voltage during cranking (presence of switching pulses)
Injector pulse width / injector command on cylinder 3 during cranking
Misfire counter / cylinder-specific misfire rate (cranking vs idle)
Crankshaft RPM trace during start (irregular RPM indicates misfire)
Relative compression or cranking compression values for cylinder 3 vs others
Fuel rail pressure during cranking and start (within factory spec)

Diagnostic algorithm

Retrieve all stored codes and freeze-frame data; record misfire counts and conditions (crank RPM, temperature).
Clear codes, attempt to re-create the fault under the same start conditions. Observe live data during cranking (misfire counters, injector duty, coil command).
Visually inspect spark plug, ignition coil boot, and coil electrical connector on cylinder 3 for damage, oil, or corrosion. Replace the spark plug if fouled or aged.
Swap the ignition coil from cylinder 3 with another cylinder. If the misfire follows the coil, replace the coil.
Swap or bench-test the injector from cylinder 3 (listen for click, check resistance, use a noid light or oscilloscope). If the misfire follows the injector, replace or service the injector.
Check wiring and ground continuity for coil and injector circuits (wiggle test with engine cranking). Repair any damaged wires or poor grounds.
Measure fuel rail pressure and verify adequate fuel delivery during cranking/start. Address low pressure (fuel pump, filter, pressure regulator) if out of spec.
Perform a compression or leak-down test on cylinder 3 and compare to other cylinders. If compression is low, inspect for valve issues, head gasket failure, or piston/ring wear.
Verify crank and cam position sensor signals and timing (including VANOS/variable timing if applicable). Correct timing or sensor faults as required.
After repairs, clear codes and verify multiple cold/hot starts to ensure the misfire does not return. If intermittent, capture detailed data or use a scope during cranking.

Likely causes

Ignition coil or spark plug failure on cylinder 3 (most common)
Faulty or clogged fuel injector for cylinder 3
Wiring/connectors to coil or injector (corrosion, loose, broken)
Low compression on cylinder 3 (mechanical) if electrical and fuel checks pass

Fault status

⚠️ Status

Cylinder 3 misfire detected during engine start/cranking. ECM logged a cylinder-specific misfire event for cylinder 3.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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Code

P1346

GEO P — Powertrain

Intake Camshaft Position System Performance

Brand: GEO

Type: P — Powertrain

Views: UK: 18 EN: 39 RU: 27

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty ignition coil on cylinder 3
Worn or fouled spark plug in cylinder 3
Fuel injector clogged, leaking, or electrically faulty on cylinder 3
Low cylinder compression (mechanical issue: valves, piston rings, head gasket)
Fuel delivery problem (low rail pressure or injector feed issue)
Crank or cam position sensor/timing issue affecting cylinder 3 during start

Symptoms

Rough cranking or rough engine during first seconds after start
Longer cranking or hard starting
Check Engine / malfunction indicator lamp (MIL) illuminated
Possible engine stumble or reduced power immediately after start
Misfire counts or cylinder-specific misfire detected in scan tool data

What to check

Read freeze frame and misfire counters with a capable scan tool (look at cranking RPM and cylinder-specific misfire counts)
Inspect spark plug condition and gap for cylinder 3
Measure coil primary/secondary signals or swap coil with another cylinder to see if fault follows
Swap or activate injector to verify operation or swap injector to see if code follows
Check injector resistance and connector for corrosion or poor contact
Perform a relative compression or cranking compression check on cylinder 3 and compare to others

Signal parameters

Cylinder 3 ignition coil primary voltage during cranking (presence of switching pulses)
Injector pulse width / injector command on cylinder 3 during cranking
Misfire counter / cylinder-specific misfire rate (cranking vs idle)
Crankshaft RPM trace during start (irregular RPM indicates misfire)
Relative compression or cranking compression values for cylinder 3 vs others
Fuel rail pressure during cranking and start (within factory spec)

Diagnostic algorithm

Retrieve all stored codes and freeze-frame data; record misfire counts and conditions (crank RPM, temperature).
Clear codes, attempt to re-create the fault under the same start conditions. Observe live data during cranking (misfire counters, injector duty, coil command).
Visually inspect spark plug, ignition coil boot, and coil electrical connector on cylinder 3 for damage, oil, or corrosion. Replace the spark plug if fouled or aged.
Swap the ignition coil from cylinder 3 with another cylinder. If the misfire follows the coil, replace the coil.
Swap or bench-test the injector from cylinder 3 (listen for click, check resistance, use a noid light or oscilloscope). If the misfire follows the injector, replace or service the injector.
Check wiring and ground continuity for coil and injector circuits (wiggle test with engine cranking). Repair any damaged wires or poor grounds.
Measure fuel rail pressure and verify adequate fuel delivery during cranking/start. Address low pressure (fuel pump, filter, pressure regulator) if out of spec.
Perform a compression or leak-down test on cylinder 3 and compare to other cylinders. If compression is low, inspect for valve issues, head gasket failure, or piston/ring wear.
Verify crank and cam position sensor signals and timing (including VANOS/variable timing if applicable). Correct timing or sensor faults as required.
After repairs, clear codes and verify multiple cold/hot starts to ensure the misfire does not return. If intermittent, capture detailed data or use a scope during cranking.

Likely causes

Ignition coil or spark plug failure on cylinder 3 (most common)
Faulty or clogged fuel injector for cylinder 3
Wiring/connectors to coil or injector (corrosion, loose, broken)
Low compression on cylinder 3 (mechanical) if electrical and fuel checks pass

Fault status

⚠️ Status

Cylinder 3 misfire detected during engine start/cranking. ECM logged a cylinder-specific misfire event for cylinder 3.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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Code

P1346

GM P — Powertrain

Intake Camshaft Position (CMP) Sensor System Performance

Brand: GM

Type: P — Powertrain

Views: UK: 17 EN: 41 RU: 28

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty ignition coil on cylinder 3
Worn or fouled spark plug in cylinder 3
Fuel injector clogged, leaking, or electrically faulty on cylinder 3
Low cylinder compression (mechanical issue: valves, piston rings, head gasket)
Fuel delivery problem (low rail pressure or injector feed issue)
Crank or cam position sensor/timing issue affecting cylinder 3 during start

Symptoms

Rough cranking or rough engine during first seconds after start
Longer cranking or hard starting
Check Engine / malfunction indicator lamp (MIL) illuminated
Possible engine stumble or reduced power immediately after start
Misfire counts or cylinder-specific misfire detected in scan tool data

What to check

Read freeze frame and misfire counters with a capable scan tool (look at cranking RPM and cylinder-specific misfire counts)
Inspect spark plug condition and gap for cylinder 3
Measure coil primary/secondary signals or swap coil with another cylinder to see if fault follows
Swap or activate injector to verify operation or swap injector to see if code follows
Check injector resistance and connector for corrosion or poor contact
Perform a relative compression or cranking compression check on cylinder 3 and compare to others

Signal parameters

Cylinder 3 ignition coil primary voltage during cranking (presence of switching pulses)
Injector pulse width / injector command on cylinder 3 during cranking
Misfire counter / cylinder-specific misfire rate (cranking vs idle)
Crankshaft RPM trace during start (irregular RPM indicates misfire)
Relative compression or cranking compression values for cylinder 3 vs others
Fuel rail pressure during cranking and start (within factory spec)

Diagnostic algorithm

Retrieve all stored codes and freeze-frame data; record misfire counts and conditions (crank RPM, temperature).
Clear codes, attempt to re-create the fault under the same start conditions. Observe live data during cranking (misfire counters, injector duty, coil command).
Visually inspect spark plug, ignition coil boot, and coil electrical connector on cylinder 3 for damage, oil, or corrosion. Replace the spark plug if fouled or aged.
Swap the ignition coil from cylinder 3 with another cylinder. If the misfire follows the coil, replace the coil.
Swap or bench-test the injector from cylinder 3 (listen for click, check resistance, use a noid light or oscilloscope). If the misfire follows the injector, replace or service the injector.
Check wiring and ground continuity for coil and injector circuits (wiggle test with engine cranking). Repair any damaged wires or poor grounds.
Measure fuel rail pressure and verify adequate fuel delivery during cranking/start. Address low pressure (fuel pump, filter, pressure regulator) if out of spec.
Perform a compression or leak-down test on cylinder 3 and compare to other cylinders. If compression is low, inspect for valve issues, head gasket failure, or piston/ring wear.
Verify crank and cam position sensor signals and timing (including VANOS/variable timing if applicable). Correct timing or sensor faults as required.
After repairs, clear codes and verify multiple cold/hot starts to ensure the misfire does not return. If intermittent, capture detailed data or use a scope during cranking.

Likely causes

Ignition coil or spark plug failure on cylinder 3 (most common)
Faulty or clogged fuel injector for cylinder 3
Wiring/connectors to coil or injector (corrosion, loose, broken)
Low compression on cylinder 3 (mechanical) if electrical and fuel checks pass

Fault status

⚠️ Status

Cylinder 3 misfire detected during engine start/cranking. ECM logged a cylinder-specific misfire event for cylinder 3.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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Code

P1346

GMC P — Powertrain

Intake Camshaft Position (CMP) Sensor System Performance

Brand: GMC

Type: P — Powertrain

Views: UK: 21 EN: 39 RU: 30

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty ignition coil on cylinder 3
Worn or fouled spark plug in cylinder 3
Fuel injector clogged, leaking, or electrically faulty on cylinder 3
Low cylinder compression (mechanical issue: valves, piston rings, head gasket)
Fuel delivery problem (low rail pressure or injector feed issue)
Crank or cam position sensor/timing issue affecting cylinder 3 during start

Symptoms

Rough cranking or rough engine during first seconds after start
Longer cranking or hard starting
Check Engine / malfunction indicator lamp (MIL) illuminated
Possible engine stumble or reduced power immediately after start
Misfire counts or cylinder-specific misfire detected in scan tool data

What to check

Read freeze frame and misfire counters with a capable scan tool (look at cranking RPM and cylinder-specific misfire counts)
Inspect spark plug condition and gap for cylinder 3
Measure coil primary/secondary signals or swap coil with another cylinder to see if fault follows
Swap or activate injector to verify operation or swap injector to see if code follows
Check injector resistance and connector for corrosion or poor contact
Perform a relative compression or cranking compression check on cylinder 3 and compare to others

Signal parameters

Cylinder 3 ignition coil primary voltage during cranking (presence of switching pulses)
Injector pulse width / injector command on cylinder 3 during cranking
Misfire counter / cylinder-specific misfire rate (cranking vs idle)
Crankshaft RPM trace during start (irregular RPM indicates misfire)
Relative compression or cranking compression values for cylinder 3 vs others
Fuel rail pressure during cranking and start (within factory spec)

Diagnostic algorithm

Retrieve all stored codes and freeze-frame data; record misfire counts and conditions (crank RPM, temperature).
Clear codes, attempt to re-create the fault under the same start conditions. Observe live data during cranking (misfire counters, injector duty, coil command).
Visually inspect spark plug, ignition coil boot, and coil electrical connector on cylinder 3 for damage, oil, or corrosion. Replace the spark plug if fouled or aged.
Swap the ignition coil from cylinder 3 with another cylinder. If the misfire follows the coil, replace the coil.
Swap or bench-test the injector from cylinder 3 (listen for click, check resistance, use a noid light or oscilloscope). If the misfire follows the injector, replace or service the injector.
Check wiring and ground continuity for coil and injector circuits (wiggle test with engine cranking). Repair any damaged wires or poor grounds.
Measure fuel rail pressure and verify adequate fuel delivery during cranking/start. Address low pressure (fuel pump, filter, pressure regulator) if out of spec.
Perform a compression or leak-down test on cylinder 3 and compare to other cylinders. If compression is low, inspect for valve issues, head gasket failure, or piston/ring wear.
Verify crank and cam position sensor signals and timing (including VANOS/variable timing if applicable). Correct timing or sensor faults as required.
After repairs, clear codes and verify multiple cold/hot starts to ensure the misfire does not return. If intermittent, capture detailed data or use a scope during cranking.

Likely causes

Ignition coil or spark plug failure on cylinder 3 (most common)
Faulty or clogged fuel injector for cylinder 3
Wiring/connectors to coil or injector (corrosion, loose, broken)
Low compression on cylinder 3 (mechanical) if electrical and fuel checks pass

Fault status

⚠️ Status

Cylinder 3 misfire detected during engine start/cranking. ECM logged a cylinder-specific misfire event for cylinder 3.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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Code

P1346

HUMMER P — Powertrain

Intake Camshaft Position [CMP] Sensor System Performance

Brand: HUMMER

Type: P — Powertrain

Views: UK: 9 EN: 16 RU: 16

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty ignition coil on cylinder 3
Worn or fouled spark plug in cylinder 3
Fuel injector clogged, leaking, or electrically faulty on cylinder 3
Low cylinder compression (mechanical issue: valves, piston rings, head gasket)
Fuel delivery problem (low rail pressure or injector feed issue)
Crank or cam position sensor/timing issue affecting cylinder 3 during start

Symptoms

Rough cranking or rough engine during first seconds after start
Longer cranking or hard starting
Check Engine / malfunction indicator lamp (MIL) illuminated
Possible engine stumble or reduced power immediately after start
Misfire counts or cylinder-specific misfire detected in scan tool data

What to check

Read freeze frame and misfire counters with a capable scan tool (look at cranking RPM and cylinder-specific misfire counts)
Inspect spark plug condition and gap for cylinder 3
Measure coil primary/secondary signals or swap coil with another cylinder to see if fault follows
Swap or activate injector to verify operation or swap injector to see if code follows
Check injector resistance and connector for corrosion or poor contact
Perform a relative compression or cranking compression check on cylinder 3 and compare to others

Signal parameters

Cylinder 3 ignition coil primary voltage during cranking (presence of switching pulses)
Injector pulse width / injector command on cylinder 3 during cranking
Misfire counter / cylinder-specific misfire rate (cranking vs idle)
Crankshaft RPM trace during start (irregular RPM indicates misfire)
Relative compression or cranking compression values for cylinder 3 vs others
Fuel rail pressure during cranking and start (within factory spec)

Diagnostic algorithm

Retrieve all stored codes and freeze-frame data; record misfire counts and conditions (crank RPM, temperature).
Clear codes, attempt to re-create the fault under the same start conditions. Observe live data during cranking (misfire counters, injector duty, coil command).
Visually inspect spark plug, ignition coil boot, and coil electrical connector on cylinder 3 for damage, oil, or corrosion. Replace the spark plug if fouled or aged.
Swap the ignition coil from cylinder 3 with another cylinder. If the misfire follows the coil, replace the coil.
Swap or bench-test the injector from cylinder 3 (listen for click, check resistance, use a noid light or oscilloscope). If the misfire follows the injector, replace or service the injector.
Check wiring and ground continuity for coil and injector circuits (wiggle test with engine cranking). Repair any damaged wires or poor grounds.
Measure fuel rail pressure and verify adequate fuel delivery during cranking/start. Address low pressure (fuel pump, filter, pressure regulator) if out of spec.
Perform a compression or leak-down test on cylinder 3 and compare to other cylinders. If compression is low, inspect for valve issues, head gasket failure, or piston/ring wear.
Verify crank and cam position sensor signals and timing (including VANOS/variable timing if applicable). Correct timing or sensor faults as required.
After repairs, clear codes and verify multiple cold/hot starts to ensure the misfire does not return. If intermittent, capture detailed data or use a scope during cranking.

Likely causes

Ignition coil or spark plug failure on cylinder 3 (most common)
Faulty or clogged fuel injector for cylinder 3
Wiring/connectors to coil or injector (corrosion, loose, broken)
Low compression on cylinder 3 (mechanical) if electrical and fuel checks pass

Fault status

⚠️ Status

Cylinder 3 misfire detected during engine start/cranking. ECM logged a cylinder-specific misfire event for cylinder 3.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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Code

P1346

LAND ROVER P — Powertrain

Circuit B of the fuel level sensor

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 7 EN: 15 RU: 16

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty ignition coil on cylinder 3
Worn or fouled spark plug in cylinder 3
Fuel injector clogged, leaking, or electrically faulty on cylinder 3
Low cylinder compression (mechanical issue: valves, piston rings, head gasket)
Fuel delivery problem (low rail pressure or injector feed issue)
Crank or cam position sensor/timing issue affecting cylinder 3 during start

Symptoms

Rough cranking or rough engine during first seconds after start
Longer cranking or hard starting
Check Engine / malfunction indicator lamp (MIL) illuminated
Possible engine stumble or reduced power immediately after start
Misfire counts or cylinder-specific misfire detected in scan tool data

What to check

Read freeze frame and misfire counters with a capable scan tool (look at cranking RPM and cylinder-specific misfire counts)
Inspect spark plug condition and gap for cylinder 3
Measure coil primary/secondary signals or swap coil with another cylinder to see if fault follows
Swap or activate injector to verify operation or swap injector to see if code follows
Check injector resistance and connector for corrosion or poor contact
Perform a relative compression or cranking compression check on cylinder 3 and compare to others

Signal parameters

Cylinder 3 ignition coil primary voltage during cranking (presence of switching pulses)
Injector pulse width / injector command on cylinder 3 during cranking
Misfire counter / cylinder-specific misfire rate (cranking vs idle)
Crankshaft RPM trace during start (irregular RPM indicates misfire)
Relative compression or cranking compression values for cylinder 3 vs others
Fuel rail pressure during cranking and start (within factory spec)

Diagnostic algorithm

Retrieve all stored codes and freeze-frame data; record misfire counts and conditions (crank RPM, temperature).
Clear codes, attempt to re-create the fault under the same start conditions. Observe live data during cranking (misfire counters, injector duty, coil command).
Visually inspect spark plug, ignition coil boot, and coil electrical connector on cylinder 3 for damage, oil, or corrosion. Replace the spark plug if fouled or aged.
Swap the ignition coil from cylinder 3 with another cylinder. If the misfire follows the coil, replace the coil.
Swap or bench-test the injector from cylinder 3 (listen for click, check resistance, use a noid light or oscilloscope). If the misfire follows the injector, replace or service the injector.
Check wiring and ground continuity for coil and injector circuits (wiggle test with engine cranking). Repair any damaged wires or poor grounds.
Measure fuel rail pressure and verify adequate fuel delivery during cranking/start. Address low pressure (fuel pump, filter, pressure regulator) if out of spec.
Perform a compression or leak-down test on cylinder 3 and compare to other cylinders. If compression is low, inspect for valve issues, head gasket failure, or piston/ring wear.
Verify crank and cam position sensor signals and timing (including VANOS/variable timing if applicable). Correct timing or sensor faults as required.
After repairs, clear codes and verify multiple cold/hot starts to ensure the misfire does not return. If intermittent, capture detailed data or use a scope during cranking.

Likely causes

Ignition coil or spark plug failure on cylinder 3 (most common)
Faulty or clogged fuel injector for cylinder 3
Wiring/connectors to coil or injector (corrosion, loose, broken)
Low compression on cylinder 3 (mechanical) if electrical and fuel checks pass

Fault status

⚠️ Status

Cylinder 3 misfire detected during engine start/cranking. ECM logged a cylinder-specific misfire event for cylinder 3.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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Code

P1346

LEXUS P — Powertrain

VVT Sensor Range Performance Problem Bank 1

Brand: LEXUS

Type: P — Powertrain

Views: UK: 24 EN: 53 RU: 31

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty ignition coil on cylinder 3
Worn or fouled spark plug in cylinder 3
Fuel injector clogged, leaking, or electrically faulty on cylinder 3
Low cylinder compression (mechanical issue: valves, piston rings, head gasket)
Fuel delivery problem (low rail pressure or injector feed issue)
Crank or cam position sensor/timing issue affecting cylinder 3 during start

Symptoms

Rough cranking or rough engine during first seconds after start
Longer cranking or hard starting
Check Engine / malfunction indicator lamp (MIL) illuminated
Possible engine stumble or reduced power immediately after start
Misfire counts or cylinder-specific misfire detected in scan tool data

What to check

Read freeze frame and misfire counters with a capable scan tool (look at cranking RPM and cylinder-specific misfire counts)
Inspect spark plug condition and gap for cylinder 3
Measure coil primary/secondary signals or swap coil with another cylinder to see if fault follows
Swap or activate injector to verify operation or swap injector to see if code follows
Check injector resistance and connector for corrosion or poor contact
Perform a relative compression or cranking compression check on cylinder 3 and compare to others

Signal parameters

Cylinder 3 ignition coil primary voltage during cranking (presence of switching pulses)
Injector pulse width / injector command on cylinder 3 during cranking
Misfire counter / cylinder-specific misfire rate (cranking vs idle)
Crankshaft RPM trace during start (irregular RPM indicates misfire)
Relative compression or cranking compression values for cylinder 3 vs others
Fuel rail pressure during cranking and start (within factory spec)

Diagnostic algorithm

Retrieve all stored codes and freeze-frame data; record misfire counts and conditions (crank RPM, temperature).
Clear codes, attempt to re-create the fault under the same start conditions. Observe live data during cranking (misfire counters, injector duty, coil command).
Visually inspect spark plug, ignition coil boot, and coil electrical connector on cylinder 3 for damage, oil, or corrosion. Replace the spark plug if fouled or aged.
Swap the ignition coil from cylinder 3 with another cylinder. If the misfire follows the coil, replace the coil.
Swap or bench-test the injector from cylinder 3 (listen for click, check resistance, use a noid light or oscilloscope). If the misfire follows the injector, replace or service the injector.
Check wiring and ground continuity for coil and injector circuits (wiggle test with engine cranking). Repair any damaged wires or poor grounds.
Measure fuel rail pressure and verify adequate fuel delivery during cranking/start. Address low pressure (fuel pump, filter, pressure regulator) if out of spec.
Perform a compression or leak-down test on cylinder 3 and compare to other cylinders. If compression is low, inspect for valve issues, head gasket failure, or piston/ring wear.
Verify crank and cam position sensor signals and timing (including VANOS/variable timing if applicable). Correct timing or sensor faults as required.
After repairs, clear codes and verify multiple cold/hot starts to ensure the misfire does not return. If intermittent, capture detailed data or use a scope during cranking.

Likely causes

Ignition coil or spark plug failure on cylinder 3 (most common)
Faulty or clogged fuel injector for cylinder 3
Wiring/connectors to coil or injector (corrosion, loose, broken)
Low compression on cylinder 3 (mechanical) if electrical and fuel checks pass

Fault status

⚠️ Status

Cylinder 3 misfire detected during engine start/cranking. ECM logged a cylinder-specific misfire event for cylinder 3.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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Code

P1346

OLDSMOBILE P — Powertrain

Intake Camshaft Position CMP Sensor System Performance

Brand: OLDSMOBILE

Type: P — Powertrain

Views: UK: 20 EN: 32 RU: 27

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty ignition coil on cylinder 3
Worn or fouled spark plug in cylinder 3
Fuel injector clogged, leaking, or electrically faulty on cylinder 3
Low cylinder compression (mechanical issue: valves, piston rings, head gasket)
Fuel delivery problem (low rail pressure or injector feed issue)
Crank or cam position sensor/timing issue affecting cylinder 3 during start

Symptoms

Rough cranking or rough engine during first seconds after start
Longer cranking or hard starting
Check Engine / malfunction indicator lamp (MIL) illuminated
Possible engine stumble or reduced power immediately after start
Misfire counts or cylinder-specific misfire detected in scan tool data

What to check

Read freeze frame and misfire counters with a capable scan tool (look at cranking RPM and cylinder-specific misfire counts)
Inspect spark plug condition and gap for cylinder 3
Measure coil primary/secondary signals or swap coil with another cylinder to see if fault follows
Swap or activate injector to verify operation or swap injector to see if code follows
Check injector resistance and connector for corrosion or poor contact
Perform a relative compression or cranking compression check on cylinder 3 and compare to others

Signal parameters

Cylinder 3 ignition coil primary voltage during cranking (presence of switching pulses)
Injector pulse width / injector command on cylinder 3 during cranking
Misfire counter / cylinder-specific misfire rate (cranking vs idle)
Crankshaft RPM trace during start (irregular RPM indicates misfire)
Relative compression or cranking compression values for cylinder 3 vs others
Fuel rail pressure during cranking and start (within factory spec)

Diagnostic algorithm

Retrieve all stored codes and freeze-frame data; record misfire counts and conditions (crank RPM, temperature).
Clear codes, attempt to re-create the fault under the same start conditions. Observe live data during cranking (misfire counters, injector duty, coil command).
Visually inspect spark plug, ignition coil boot, and coil electrical connector on cylinder 3 for damage, oil, or corrosion. Replace the spark plug if fouled or aged.
Swap the ignition coil from cylinder 3 with another cylinder. If the misfire follows the coil, replace the coil.
Swap or bench-test the injector from cylinder 3 (listen for click, check resistance, use a noid light or oscilloscope). If the misfire follows the injector, replace or service the injector.
Check wiring and ground continuity for coil and injector circuits (wiggle test with engine cranking). Repair any damaged wires or poor grounds.
Measure fuel rail pressure and verify adequate fuel delivery during cranking/start. Address low pressure (fuel pump, filter, pressure regulator) if out of spec.
Perform a compression or leak-down test on cylinder 3 and compare to other cylinders. If compression is low, inspect for valve issues, head gasket failure, or piston/ring wear.
Verify crank and cam position sensor signals and timing (including VANOS/variable timing if applicable). Correct timing or sensor faults as required.
After repairs, clear codes and verify multiple cold/hot starts to ensure the misfire does not return. If intermittent, capture detailed data or use a scope during cranking.

Likely causes

Ignition coil or spark plug failure on cylinder 3 (most common)
Faulty or clogged fuel injector for cylinder 3
Wiring/connectors to coil or injector (corrosion, loose, broken)
Low compression on cylinder 3 (mechanical) if electrical and fuel checks pass

Fault status

⚠️ Status

Cylinder 3 misfire detected during engine start/cranking. ECM logged a cylinder-specific misfire event for cylinder 3.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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Code

P1346

Other P — Powertrain

Fuel Level Sensor B Circuit Malfunction

Brand: Other

Type: P — Powertrain

Views: UK: 23 EN: 46 RU: 29

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty ignition coil on cylinder 3
Worn or fouled spark plug in cylinder 3
Fuel injector clogged, leaking, or electrically faulty on cylinder 3
Low cylinder compression (mechanical issue: valves, piston rings, head gasket)
Fuel delivery problem (low rail pressure or injector feed issue)
Crank or cam position sensor/timing issue affecting cylinder 3 during start

Symptoms

Rough cranking or rough engine during first seconds after start
Longer cranking or hard starting
Check Engine / malfunction indicator lamp (MIL) illuminated
Possible engine stumble or reduced power immediately after start
Misfire counts or cylinder-specific misfire detected in scan tool data

What to check

Read freeze frame and misfire counters with a capable scan tool (look at cranking RPM and cylinder-specific misfire counts)
Inspect spark plug condition and gap for cylinder 3
Measure coil primary/secondary signals or swap coil with another cylinder to see if fault follows
Swap or activate injector to verify operation or swap injector to see if code follows
Check injector resistance and connector for corrosion or poor contact
Perform a relative compression or cranking compression check on cylinder 3 and compare to others

Signal parameters

Cylinder 3 ignition coil primary voltage during cranking (presence of switching pulses)
Injector pulse width / injector command on cylinder 3 during cranking
Misfire counter / cylinder-specific misfire rate (cranking vs idle)
Crankshaft RPM trace during start (irregular RPM indicates misfire)
Relative compression or cranking compression values for cylinder 3 vs others
Fuel rail pressure during cranking and start (within factory spec)

Diagnostic algorithm

Retrieve all stored codes and freeze-frame data; record misfire counts and conditions (crank RPM, temperature).
Clear codes, attempt to re-create the fault under the same start conditions. Observe live data during cranking (misfire counters, injector duty, coil command).
Visually inspect spark plug, ignition coil boot, and coil electrical connector on cylinder 3 for damage, oil, or corrosion. Replace the spark plug if fouled or aged.
Swap the ignition coil from cylinder 3 with another cylinder. If the misfire follows the coil, replace the coil.
Swap or bench-test the injector from cylinder 3 (listen for click, check resistance, use a noid light or oscilloscope). If the misfire follows the injector, replace or service the injector.
Check wiring and ground continuity for coil and injector circuits (wiggle test with engine cranking). Repair any damaged wires or poor grounds.
Measure fuel rail pressure and verify adequate fuel delivery during cranking/start. Address low pressure (fuel pump, filter, pressure regulator) if out of spec.
Perform a compression or leak-down test on cylinder 3 and compare to other cylinders. If compression is low, inspect for valve issues, head gasket failure, or piston/ring wear.
Verify crank and cam position sensor signals and timing (including VANOS/variable timing if applicable). Correct timing or sensor faults as required.
After repairs, clear codes and verify multiple cold/hot starts to ensure the misfire does not return. If intermittent, capture detailed data or use a scope during cranking.

Likely causes

Ignition coil or spark plug failure on cylinder 3 (most common)
Faulty or clogged fuel injector for cylinder 3
Wiring/connectors to coil or injector (corrosion, loose, broken)
Low compression on cylinder 3 (mechanical) if electrical and fuel checks pass

Fault status

⚠️ Status

Cylinder 3 misfire detected during engine start/cranking. ECM logged a cylinder-specific misfire event for cylinder 3.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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Code

P1346

SATURN P — Powertrain

Intake Camshaft Position CMP Sensor System Performance

Brand: SATURN

Type: P — Powertrain

Views: UK: 19 EN: 33 RU: 26

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty ignition coil on cylinder 3
Worn or fouled spark plug in cylinder 3
Fuel injector clogged, leaking, or electrically faulty on cylinder 3
Low cylinder compression (mechanical issue: valves, piston rings, head gasket)
Fuel delivery problem (low rail pressure or injector feed issue)
Crank or cam position sensor/timing issue affecting cylinder 3 during start

Symptoms

Rough cranking or rough engine during first seconds after start
Longer cranking or hard starting
Check Engine / malfunction indicator lamp (MIL) illuminated
Possible engine stumble or reduced power immediately after start
Misfire counts or cylinder-specific misfire detected in scan tool data

What to check

Read freeze frame and misfire counters with a capable scan tool (look at cranking RPM and cylinder-specific misfire counts)
Inspect spark plug condition and gap for cylinder 3
Measure coil primary/secondary signals or swap coil with another cylinder to see if fault follows
Swap or activate injector to verify operation or swap injector to see if code follows
Check injector resistance and connector for corrosion or poor contact
Perform a relative compression or cranking compression check on cylinder 3 and compare to others

Signal parameters

Cylinder 3 ignition coil primary voltage during cranking (presence of switching pulses)
Injector pulse width / injector command on cylinder 3 during cranking
Misfire counter / cylinder-specific misfire rate (cranking vs idle)
Crankshaft RPM trace during start (irregular RPM indicates misfire)
Relative compression or cranking compression values for cylinder 3 vs others
Fuel rail pressure during cranking and start (within factory spec)

Diagnostic algorithm

Retrieve all stored codes and freeze-frame data; record misfire counts and conditions (crank RPM, temperature).
Clear codes, attempt to re-create the fault under the same start conditions. Observe live data during cranking (misfire counters, injector duty, coil command).
Visually inspect spark plug, ignition coil boot, and coil electrical connector on cylinder 3 for damage, oil, or corrosion. Replace the spark plug if fouled or aged.
Swap the ignition coil from cylinder 3 with another cylinder. If the misfire follows the coil, replace the coil.
Swap or bench-test the injector from cylinder 3 (listen for click, check resistance, use a noid light or oscilloscope). If the misfire follows the injector, replace or service the injector.
Check wiring and ground continuity for coil and injector circuits (wiggle test with engine cranking). Repair any damaged wires or poor grounds.
Measure fuel rail pressure and verify adequate fuel delivery during cranking/start. Address low pressure (fuel pump, filter, pressure regulator) if out of spec.
Perform a compression or leak-down test on cylinder 3 and compare to other cylinders. If compression is low, inspect for valve issues, head gasket failure, or piston/ring wear.
Verify crank and cam position sensor signals and timing (including VANOS/variable timing if applicable). Correct timing or sensor faults as required.
After repairs, clear codes and verify multiple cold/hot starts to ensure the misfire does not return. If intermittent, capture detailed data or use a scope during cranking.

Likely causes

Ignition coil or spark plug failure on cylinder 3 (most common)
Faulty or clogged fuel injector for cylinder 3
Wiring/connectors to coil or injector (corrosion, loose, broken)
Low compression on cylinder 3 (mechanical) if electrical and fuel checks pass

Fault status

⚠️ Status

Cylinder 3 misfire detected during engine start/cranking. ECM logged a cylinder-specific misfire event for cylinder 3.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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Code

P1346

SCION P — Powertrain

Variable valve timing system malfunction

Brand: SCION

Type: P — Powertrain

Views: UK: 1 EN: 4 RU: 2

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty ignition coil on cylinder 3
Worn or fouled spark plug in cylinder 3
Fuel injector clogged, leaking, or electrically faulty on cylinder 3
Low cylinder compression (mechanical issue: valves, piston rings, head gasket)
Fuel delivery problem (low rail pressure or injector feed issue)
Crank or cam position sensor/timing issue affecting cylinder 3 during start

Symptoms

Rough cranking or rough engine during first seconds after start
Longer cranking or hard starting
Check Engine / malfunction indicator lamp (MIL) illuminated
Possible engine stumble or reduced power immediately after start
Misfire counts or cylinder-specific misfire detected in scan tool data

What to check

Read freeze frame and misfire counters with a capable scan tool (look at cranking RPM and cylinder-specific misfire counts)
Inspect spark plug condition and gap for cylinder 3
Measure coil primary/secondary signals or swap coil with another cylinder to see if fault follows
Swap or activate injector to verify operation or swap injector to see if code follows
Check injector resistance and connector for corrosion or poor contact
Perform a relative compression or cranking compression check on cylinder 3 and compare to others

Signal parameters

Cylinder 3 ignition coil primary voltage during cranking (presence of switching pulses)
Injector pulse width / injector command on cylinder 3 during cranking
Misfire counter / cylinder-specific misfire rate (cranking vs idle)
Crankshaft RPM trace during start (irregular RPM indicates misfire)
Relative compression or cranking compression values for cylinder 3 vs others
Fuel rail pressure during cranking and start (within factory spec)

Diagnostic algorithm

Retrieve all stored codes and freeze-frame data; record misfire counts and conditions (crank RPM, temperature).
Clear codes, attempt to re-create the fault under the same start conditions. Observe live data during cranking (misfire counters, injector duty, coil command).
Visually inspect spark plug, ignition coil boot, and coil electrical connector on cylinder 3 for damage, oil, or corrosion. Replace the spark plug if fouled or aged.
Swap the ignition coil from cylinder 3 with another cylinder. If the misfire follows the coil, replace the coil.
Swap or bench-test the injector from cylinder 3 (listen for click, check resistance, use a noid light or oscilloscope). If the misfire follows the injector, replace or service the injector.
Check wiring and ground continuity for coil and injector circuits (wiggle test with engine cranking). Repair any damaged wires or poor grounds.
Measure fuel rail pressure and verify adequate fuel delivery during cranking/start. Address low pressure (fuel pump, filter, pressure regulator) if out of spec.
Perform a compression or leak-down test on cylinder 3 and compare to other cylinders. If compression is low, inspect for valve issues, head gasket failure, or piston/ring wear.
Verify crank and cam position sensor signals and timing (including VANOS/variable timing if applicable). Correct timing or sensor faults as required.
After repairs, clear codes and verify multiple cold/hot starts to ensure the misfire does not return. If intermittent, capture detailed data or use a scope during cranking.

Likely causes

Ignition coil or spark plug failure on cylinder 3 (most common)
Faulty or clogged fuel injector for cylinder 3
Wiring/connectors to coil or injector (corrosion, loose, broken)
Low compression on cylinder 3 (mechanical) if electrical and fuel checks pass

Fault status

⚠️ Status

Cylinder 3 misfire detected during engine start/cranking. ECM logged a cylinder-specific misfire event for cylinder 3.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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Code

P1346

VOLKSWAGEN P — Powertrain

Ignition Coil Power Output State 3 Short To B+

Brand: VOLKSWAGEN

Type: P — Powertrain

Views: UK: 17 EN: 31 RU: 25

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty ignition coil on cylinder 3
Worn or fouled spark plug in cylinder 3
Fuel injector clogged, leaking, or electrically faulty on cylinder 3
Low cylinder compression (mechanical issue: valves, piston rings, head gasket)
Fuel delivery problem (low rail pressure or injector feed issue)
Crank or cam position sensor/timing issue affecting cylinder 3 during start

Symptoms

Rough cranking or rough engine during first seconds after start
Longer cranking or hard starting
Check Engine / malfunction indicator lamp (MIL) illuminated
Possible engine stumble or reduced power immediately after start
Misfire counts or cylinder-specific misfire detected in scan tool data

What to check

Read freeze frame and misfire counters with a capable scan tool (look at cranking RPM and cylinder-specific misfire counts)
Inspect spark plug condition and gap for cylinder 3
Measure coil primary/secondary signals or swap coil with another cylinder to see if fault follows
Swap or activate injector to verify operation or swap injector to see if code follows
Check injector resistance and connector for corrosion or poor contact
Perform a relative compression or cranking compression check on cylinder 3 and compare to others

Signal parameters

Cylinder 3 ignition coil primary voltage during cranking (presence of switching pulses)
Injector pulse width / injector command on cylinder 3 during cranking
Misfire counter / cylinder-specific misfire rate (cranking vs idle)
Crankshaft RPM trace during start (irregular RPM indicates misfire)
Relative compression or cranking compression values for cylinder 3 vs others
Fuel rail pressure during cranking and start (within factory spec)

Diagnostic algorithm

Retrieve all stored codes and freeze-frame data; record misfire counts and conditions (crank RPM, temperature).
Clear codes, attempt to re-create the fault under the same start conditions. Observe live data during cranking (misfire counters, injector duty, coil command).
Visually inspect spark plug, ignition coil boot, and coil electrical connector on cylinder 3 for damage, oil, or corrosion. Replace the spark plug if fouled or aged.
Swap the ignition coil from cylinder 3 with another cylinder. If the misfire follows the coil, replace the coil.
Swap or bench-test the injector from cylinder 3 (listen for click, check resistance, use a noid light or oscilloscope). If the misfire follows the injector, replace or service the injector.
Check wiring and ground continuity for coil and injector circuits (wiggle test with engine cranking). Repair any damaged wires or poor grounds.
Measure fuel rail pressure and verify adequate fuel delivery during cranking/start. Address low pressure (fuel pump, filter, pressure regulator) if out of spec.
Perform a compression or leak-down test on cylinder 3 and compare to other cylinders. If compression is low, inspect for valve issues, head gasket failure, or piston/ring wear.
Verify crank and cam position sensor signals and timing (including VANOS/variable timing if applicable). Correct timing or sensor faults as required.
After repairs, clear codes and verify multiple cold/hot starts to ensure the misfire does not return. If intermittent, capture detailed data or use a scope during cranking.

Likely causes

Ignition coil or spark plug failure on cylinder 3 (most common)
Faulty or clogged fuel injector for cylinder 3
Wiring/connectors to coil or injector (corrosion, loose, broken)
Low compression on cylinder 3 (mechanical) if electrical and fuel checks pass

Fault status

⚠️ Status

Cylinder 3 misfire detected during engine start/cranking. ECM logged a cylinder-specific misfire event for cylinder 3.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

Your experience will help others

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