P1299

Code

CITROEN P — Powertrain

Injector 4 control malfunction

Brand: CITROEN

Type: P — Powertrain

Views: UK: 1 EN: 5 RU: 5

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or short in injector 4 wiring (connector, harness, or pin)
Corroded or poorly seated injector connector
Faulty injector (coil open, shorted, or mechanically stuck)
Blown fuse or failed power supply/relay for injectors
Poor ground or high-resistance ground connection
Faulty ECU injector driver (internal short or open)

Symptoms

Check Engine light (MIL) illuminated
Rough idle or misfire, especially cylinder 4
Loss of power or uneven acceleration
Increased fuel consumption and possible smoke (diesel)
Possible hard starting or stalling

What to check

Read and record freeze-frame and live data with a scan tool; note status (continuous/pending)
Check related codes (misfire P03xx, injector circuit P0204) and stored data
Visually inspect injector 4 connector and wiring for corrosion, damage, or water
Check injector supply fuse and relay for proper operation
Measure injector 4 coil resistance with meter and compare to manufacturer spec
Back-probe injector connector to verify supply voltage (battery) and ECU switching signal while cranking

Signal parameters

Injector supply: approx. battery voltage (11–14 V) present at the + injector terminal with ignition ON
Injector driver output: low-side switching to ground; pulse voltage ~0 V when ON, open-circuit (near battery voltage) when OFF
Typical injector coil resistance: check factory spec; many petrol injectors 2–16 Ω (verify exact value for engine)
Pulse width: variable with engine load (milliseconds); present during cranking and running
Oscilloscope pattern: clean square pulses with stable rise/fall; noisy or clipped waveform indicates driver or wiring fault

Diagnostic algorithm

Connect a capable scan tool, read all codes, freeze-frame data and pending status. Note engine conditions when code set.
Visually inspect the injector 4 connector and wiring for damage, corrosion, poor seating, or water intrusion. Repair any obvious faults.
With connector connected, back-probe the supply pin for injector 4. Verify battery voltage with ignition ON. If missing, check injector fuse/relay and supply wiring.
Back-probe the injector driver pin while cranking or commanding injector ON from the tool. Confirm switching to ground (pulsing). If no switching, check ECU driver output wiring continuity to ECU.
Remove connector and measure injector coil resistance at the injector terminals. Compare to spec. An open or shorted injector indicates replacement.
Wiggle test the harness and connector while monitoring the signal or engine behavior to detect intermittent faults.
If resistance and supply are good but no driver signal, inspect continuity from injector connector to ECU and check ECU ground(s). Repair wiring as needed.
If wiring and supply are good but the injector still fails when commanded, swap injector 4 with another cylinder's injector. If the code/symptom moves with the injector, replace the injector. If it stays on cylinder 4, suspect wiring or ECU.
If tests point to ECU driver failure (no switching output but wiring/grounds OK), consult manufacturer service info before replacing ECU — check for TSBs or reprogramming.
After repair, clear codes and road-test to confirm the fault does not return; re-check for related misfire codes or drivability issues.

Likely causes

Damaged or corroded connector at injector 4
Injector 4 coil resistance out of specification (open or short)
Wiring harness fault between injector and ECU (open/short to power or ground)
Faulty injector driver transistor in ECU (less common)

Fault status

⚠️ Status

Manufacturer-specific code P1299: Injector 4 control malfunction detected by ECM. Indicates abnormal behavior in injector 4 control circuit or the injector itself.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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Code

P1299

DODGE P — Powertrain

Vacuum Leak Found (IAC Fully Seated)

Brand: DODGE

Type: P — Powertrain

Views: UK: 22 EN: 52 RU: 27

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or short in injector 4 wiring (connector, harness, or pin)
Corroded or poorly seated injector connector
Faulty injector (coil open, shorted, or mechanically stuck)
Blown fuse or failed power supply/relay for injectors
Poor ground or high-resistance ground connection
Faulty ECU injector driver (internal short or open)

Symptoms

Check Engine light (MIL) illuminated
Rough idle or misfire, especially cylinder 4
Loss of power or uneven acceleration
Increased fuel consumption and possible smoke (diesel)
Possible hard starting or stalling

What to check

Read and record freeze-frame and live data with a scan tool; note status (continuous/pending)
Check related codes (misfire P03xx, injector circuit P0204) and stored data
Visually inspect injector 4 connector and wiring for corrosion, damage, or water
Check injector supply fuse and relay for proper operation
Measure injector 4 coil resistance with meter and compare to manufacturer spec
Back-probe injector connector to verify supply voltage (battery) and ECU switching signal while cranking

Signal parameters

Injector supply: approx. battery voltage (11–14 V) present at the + injector terminal with ignition ON
Injector driver output: low-side switching to ground; pulse voltage ~0 V when ON, open-circuit (near battery voltage) when OFF
Typical injector coil resistance: check factory spec; many petrol injectors 2–16 Ω (verify exact value for engine)
Pulse width: variable with engine load (milliseconds); present during cranking and running
Oscilloscope pattern: clean square pulses with stable rise/fall; noisy or clipped waveform indicates driver or wiring fault

Diagnostic algorithm

Connect a capable scan tool, read all codes, freeze-frame data and pending status. Note engine conditions when code set.
Visually inspect the injector 4 connector and wiring for damage, corrosion, poor seating, or water intrusion. Repair any obvious faults.
With connector connected, back-probe the supply pin for injector 4. Verify battery voltage with ignition ON. If missing, check injector fuse/relay and supply wiring.
Back-probe the injector driver pin while cranking or commanding injector ON from the tool. Confirm switching to ground (pulsing). If no switching, check ECU driver output wiring continuity to ECU.
Remove connector and measure injector coil resistance at the injector terminals. Compare to spec. An open or shorted injector indicates replacement.
Wiggle test the harness and connector while monitoring the signal or engine behavior to detect intermittent faults.
If resistance and supply are good but no driver signal, inspect continuity from injector connector to ECU and check ECU ground(s). Repair wiring as needed.
If wiring and supply are good but the injector still fails when commanded, swap injector 4 with another cylinder's injector. If the code/symptom moves with the injector, replace the injector. If it stays on cylinder 4, suspect wiring or ECU.
If tests point to ECU driver failure (no switching output but wiring/grounds OK), consult manufacturer service info before replacing ECU — check for TSBs or reprogramming.
After repair, clear codes and road-test to confirm the fault does not return; re-check for related misfire codes or drivability issues.

Likely causes

Damaged or corroded connector at injector 4
Injector 4 coil resistance out of specification (open or short)
Wiring harness fault between injector and ECU (open/short to power or ground)
Faulty injector driver transistor in ECU (less common)

Fault status

⚠️ Status

Manufacturer-specific code P1299: Injector 4 control malfunction detected by ECM. Indicates abnormal behavior in injector 4 control circuit or the injector itself.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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Code

P1299

DS P — Powertrain

Injector 4 control malfunction

Brand: DS

Type: P — Powertrain

Views: UK: 1 EN: 4 RU: 1

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or short in injector 4 wiring (connector, harness, or pin)
Corroded or poorly seated injector connector
Faulty injector (coil open, shorted, or mechanically stuck)
Blown fuse or failed power supply/relay for injectors
Poor ground or high-resistance ground connection
Faulty ECU injector driver (internal short or open)

Symptoms

Check Engine light (MIL) illuminated
Rough idle or misfire, especially cylinder 4
Loss of power or uneven acceleration
Increased fuel consumption and possible smoke (diesel)
Possible hard starting or stalling

What to check

Read and record freeze-frame and live data with a scan tool; note status (continuous/pending)
Check related codes (misfire P03xx, injector circuit P0204) and stored data
Visually inspect injector 4 connector and wiring for corrosion, damage, or water
Check injector supply fuse and relay for proper operation
Measure injector 4 coil resistance with meter and compare to manufacturer spec
Back-probe injector connector to verify supply voltage (battery) and ECU switching signal while cranking

Signal parameters

Injector supply: approx. battery voltage (11–14 V) present at the + injector terminal with ignition ON
Injector driver output: low-side switching to ground; pulse voltage ~0 V when ON, open-circuit (near battery voltage) when OFF
Typical injector coil resistance: check factory spec; many petrol injectors 2–16 Ω (verify exact value for engine)
Pulse width: variable with engine load (milliseconds); present during cranking and running
Oscilloscope pattern: clean square pulses with stable rise/fall; noisy or clipped waveform indicates driver or wiring fault

Diagnostic algorithm

Connect a capable scan tool, read all codes, freeze-frame data and pending status. Note engine conditions when code set.
Visually inspect the injector 4 connector and wiring for damage, corrosion, poor seating, or water intrusion. Repair any obvious faults.
With connector connected, back-probe the supply pin for injector 4. Verify battery voltage with ignition ON. If missing, check injector fuse/relay and supply wiring.
Back-probe the injector driver pin while cranking or commanding injector ON from the tool. Confirm switching to ground (pulsing). If no switching, check ECU driver output wiring continuity to ECU.
Remove connector and measure injector coil resistance at the injector terminals. Compare to spec. An open or shorted injector indicates replacement.
Wiggle test the harness and connector while monitoring the signal or engine behavior to detect intermittent faults.
If resistance and supply are good but no driver signal, inspect continuity from injector connector to ECU and check ECU ground(s). Repair wiring as needed.
If wiring and supply are good but the injector still fails when commanded, swap injector 4 with another cylinder's injector. If the code/symptom moves with the injector, replace the injector. If it stays on cylinder 4, suspect wiring or ECU.
If tests point to ECU driver failure (no switching output but wiring/grounds OK), consult manufacturer service info before replacing ECU — check for TSBs or reprogramming.
After repair, clear codes and road-test to confirm the fault does not return; re-check for related misfire codes or drivability issues.

Likely causes

Damaged or corroded connector at injector 4
Injector 4 coil resistance out of specification (open or short)
Wiring harness fault between injector and ECU (open/short to power or ground)
Faulty injector driver transistor in ECU (less common)

Fault status

⚠️ Status

Manufacturer-specific code P1299: Injector 4 control malfunction detected by ECM. Indicates abnormal behavior in injector 4 control circuit or the injector itself.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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Code

P1299

FORD P — Powertrain

Cylinder Head Temperature Sensor Detected Engine Overheating Condition

Brand: FORD

Type: P — Powertrain

Views: UK: 16 EN: 40 RU: 22

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or short in injector 4 wiring (connector, harness, or pin)
Corroded or poorly seated injector connector
Faulty injector (coil open, shorted, or mechanically stuck)
Blown fuse or failed power supply/relay for injectors
Poor ground or high-resistance ground connection
Faulty ECU injector driver (internal short or open)

Symptoms

Check Engine light (MIL) illuminated
Rough idle or misfire, especially cylinder 4
Loss of power or uneven acceleration
Increased fuel consumption and possible smoke (diesel)
Possible hard starting or stalling

What to check

Read and record freeze-frame and live data with a scan tool; note status (continuous/pending)
Check related codes (misfire P03xx, injector circuit P0204) and stored data
Visually inspect injector 4 connector and wiring for corrosion, damage, or water
Check injector supply fuse and relay for proper operation
Measure injector 4 coil resistance with meter and compare to manufacturer spec
Back-probe injector connector to verify supply voltage (battery) and ECU switching signal while cranking

Signal parameters

Injector supply: approx. battery voltage (11–14 V) present at the + injector terminal with ignition ON
Injector driver output: low-side switching to ground; pulse voltage ~0 V when ON, open-circuit (near battery voltage) when OFF
Typical injector coil resistance: check factory spec; many petrol injectors 2–16 Ω (verify exact value for engine)
Pulse width: variable with engine load (milliseconds); present during cranking and running
Oscilloscope pattern: clean square pulses with stable rise/fall; noisy or clipped waveform indicates driver or wiring fault

Diagnostic algorithm

Connect a capable scan tool, read all codes, freeze-frame data and pending status. Note engine conditions when code set.
Visually inspect the injector 4 connector and wiring for damage, corrosion, poor seating, or water intrusion. Repair any obvious faults.
With connector connected, back-probe the supply pin for injector 4. Verify battery voltage with ignition ON. If missing, check injector fuse/relay and supply wiring.
Back-probe the injector driver pin while cranking or commanding injector ON from the tool. Confirm switching to ground (pulsing). If no switching, check ECU driver output wiring continuity to ECU.
Remove connector and measure injector coil resistance at the injector terminals. Compare to spec. An open or shorted injector indicates replacement.
Wiggle test the harness and connector while monitoring the signal or engine behavior to detect intermittent faults.
If resistance and supply are good but no driver signal, inspect continuity from injector connector to ECU and check ECU ground(s). Repair wiring as needed.
If wiring and supply are good but the injector still fails when commanded, swap injector 4 with another cylinder's injector. If the code/symptom moves with the injector, replace the injector. If it stays on cylinder 4, suspect wiring or ECU.
If tests point to ECU driver failure (no switching output but wiring/grounds OK), consult manufacturer service info before replacing ECU — check for TSBs or reprogramming.
After repair, clear codes and road-test to confirm the fault does not return; re-check for related misfire codes or drivability issues.

Likely causes

Damaged or corroded connector at injector 4
Injector 4 coil resistance out of specification (open or short)
Wiring harness fault between injector and ECU (open/short to power or ground)
Faulty injector driver transistor in ECU (less common)

Fault status

⚠️ Status

Manufacturer-specific code P1299: Injector 4 control malfunction detected by ECM. Indicates abnormal behavior in injector 4 control circuit or the injector itself.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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Code

P1299

Generic P — Powertrain

Cylinder Head Overtemperature Protection Active

Brand: Generic

Type: P — Powertrain

Views: UK: 20 EN: 43 RU: 23

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or short in injector 4 wiring (connector, harness, or pin)
Corroded or poorly seated injector connector
Faulty injector (coil open, shorted, or mechanically stuck)
Blown fuse or failed power supply/relay for injectors
Poor ground or high-resistance ground connection
Faulty ECU injector driver (internal short or open)

Symptoms

Check Engine light (MIL) illuminated
Rough idle or misfire, especially cylinder 4
Loss of power or uneven acceleration
Increased fuel consumption and possible smoke (diesel)
Possible hard starting or stalling

What to check

Read and record freeze-frame and live data with a scan tool; note status (continuous/pending)
Check related codes (misfire P03xx, injector circuit P0204) and stored data
Visually inspect injector 4 connector and wiring for corrosion, damage, or water
Check injector supply fuse and relay for proper operation
Measure injector 4 coil resistance with meter and compare to manufacturer spec
Back-probe injector connector to verify supply voltage (battery) and ECU switching signal while cranking

Signal parameters

Injector supply: approx. battery voltage (11–14 V) present at the + injector terminal with ignition ON
Injector driver output: low-side switching to ground; pulse voltage ~0 V when ON, open-circuit (near battery voltage) when OFF
Typical injector coil resistance: check factory spec; many petrol injectors 2–16 Ω (verify exact value for engine)
Pulse width: variable with engine load (milliseconds); present during cranking and running
Oscilloscope pattern: clean square pulses with stable rise/fall; noisy or clipped waveform indicates driver or wiring fault

Diagnostic algorithm

Connect a capable scan tool, read all codes, freeze-frame data and pending status. Note engine conditions when code set.
Visually inspect the injector 4 connector and wiring for damage, corrosion, poor seating, or water intrusion. Repair any obvious faults.
With connector connected, back-probe the supply pin for injector 4. Verify battery voltage with ignition ON. If missing, check injector fuse/relay and supply wiring.
Back-probe the injector driver pin while cranking or commanding injector ON from the tool. Confirm switching to ground (pulsing). If no switching, check ECU driver output wiring continuity to ECU.
Remove connector and measure injector coil resistance at the injector terminals. Compare to spec. An open or shorted injector indicates replacement.
Wiggle test the harness and connector while monitoring the signal or engine behavior to detect intermittent faults.
If resistance and supply are good but no driver signal, inspect continuity from injector connector to ECU and check ECU ground(s). Repair wiring as needed.
If wiring and supply are good but the injector still fails when commanded, swap injector 4 with another cylinder's injector. If the code/symptom moves with the injector, replace the injector. If it stays on cylinder 4, suspect wiring or ECU.
If tests point to ECU driver failure (no switching output but wiring/grounds OK), consult manufacturer service info before replacing ECU — check for TSBs or reprogramming.
After repair, clear codes and road-test to confirm the fault does not return; re-check for related misfire codes or drivability issues.

Likely causes

Damaged or corroded connector at injector 4
Injector 4 coil resistance out of specification (open or short)
Wiring harness fault between injector and ECU (open/short to power or ground)
Faulty injector driver transistor in ECU (less common)

Fault status

⚠️ Status

Manufacturer-specific code P1299: Injector 4 control malfunction detected by ECM. Indicates abnormal behavior in injector 4 control circuit or the injector itself.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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Code

P1299

JEEP P — Powertrain

Vacuum Leak Found (IAC Fully Seated)

Brand: JEEP

Type: P — Powertrain

Views: UK: 20 EN: 44 RU: 23

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or short in injector 4 wiring (connector, harness, or pin)
Corroded or poorly seated injector connector
Faulty injector (coil open, shorted, or mechanically stuck)
Blown fuse or failed power supply/relay for injectors
Poor ground or high-resistance ground connection
Faulty ECU injector driver (internal short or open)

Symptoms

Check Engine light (MIL) illuminated
Rough idle or misfire, especially cylinder 4
Loss of power or uneven acceleration
Increased fuel consumption and possible smoke (diesel)
Possible hard starting or stalling

What to check

Read and record freeze-frame and live data with a scan tool; note status (continuous/pending)
Check related codes (misfire P03xx, injector circuit P0204) and stored data
Visually inspect injector 4 connector and wiring for corrosion, damage, or water
Check injector supply fuse and relay for proper operation
Measure injector 4 coil resistance with meter and compare to manufacturer spec
Back-probe injector connector to verify supply voltage (battery) and ECU switching signal while cranking

Signal parameters

Injector supply: approx. battery voltage (11–14 V) present at the + injector terminal with ignition ON
Injector driver output: low-side switching to ground; pulse voltage ~0 V when ON, open-circuit (near battery voltage) when OFF
Typical injector coil resistance: check factory spec; many petrol injectors 2–16 Ω (verify exact value for engine)
Pulse width: variable with engine load (milliseconds); present during cranking and running
Oscilloscope pattern: clean square pulses with stable rise/fall; noisy or clipped waveform indicates driver or wiring fault

Diagnostic algorithm

Connect a capable scan tool, read all codes, freeze-frame data and pending status. Note engine conditions when code set.
Visually inspect the injector 4 connector and wiring for damage, corrosion, poor seating, or water intrusion. Repair any obvious faults.
With connector connected, back-probe the supply pin for injector 4. Verify battery voltage with ignition ON. If missing, check injector fuse/relay and supply wiring.
Back-probe the injector driver pin while cranking or commanding injector ON from the tool. Confirm switching to ground (pulsing). If no switching, check ECU driver output wiring continuity to ECU.
Remove connector and measure injector coil resistance at the injector terminals. Compare to spec. An open or shorted injector indicates replacement.
Wiggle test the harness and connector while monitoring the signal or engine behavior to detect intermittent faults.
If resistance and supply are good but no driver signal, inspect continuity from injector connector to ECU and check ECU ground(s). Repair wiring as needed.
If wiring and supply are good but the injector still fails when commanded, swap injector 4 with another cylinder's injector. If the code/symptom moves with the injector, replace the injector. If it stays on cylinder 4, suspect wiring or ECU.
If tests point to ECU driver failure (no switching output but wiring/grounds OK), consult manufacturer service info before replacing ECU — check for TSBs or reprogramming.
After repair, clear codes and road-test to confirm the fault does not return; re-check for related misfire codes or drivability issues.

Likely causes

Damaged or corroded connector at injector 4
Injector 4 coil resistance out of specification (open or short)
Wiring harness fault between injector and ECU (open/short to power or ground)
Faulty injector driver transistor in ECU (less common)

Fault status

⚠️ Status

Manufacturer-specific code P1299: Injector 4 control malfunction detected by ECM. Indicates abnormal behavior in injector 4 control circuit or the injector itself.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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Code

P1299

LAND ROVER P — Powertrain

Cylinder head protection failure

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 8 EN: 14 RU: 9

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or short in injector 4 wiring (connector, harness, or pin)
Corroded or poorly seated injector connector
Faulty injector (coil open, shorted, or mechanically stuck)
Blown fuse or failed power supply/relay for injectors
Poor ground or high-resistance ground connection
Faulty ECU injector driver (internal short or open)

Symptoms

Check Engine light (MIL) illuminated
Rough idle or misfire, especially cylinder 4
Loss of power or uneven acceleration
Increased fuel consumption and possible smoke (diesel)
Possible hard starting or stalling

What to check

Read and record freeze-frame and live data with a scan tool; note status (continuous/pending)
Check related codes (misfire P03xx, injector circuit P0204) and stored data
Visually inspect injector 4 connector and wiring for corrosion, damage, or water
Check injector supply fuse and relay for proper operation
Measure injector 4 coil resistance with meter and compare to manufacturer spec
Back-probe injector connector to verify supply voltage (battery) and ECU switching signal while cranking

Signal parameters

Injector supply: approx. battery voltage (11–14 V) present at the + injector terminal with ignition ON
Injector driver output: low-side switching to ground; pulse voltage ~0 V when ON, open-circuit (near battery voltage) when OFF
Typical injector coil resistance: check factory spec; many petrol injectors 2–16 Ω (verify exact value for engine)
Pulse width: variable with engine load (milliseconds); present during cranking and running
Oscilloscope pattern: clean square pulses with stable rise/fall; noisy or clipped waveform indicates driver or wiring fault

Diagnostic algorithm

Connect a capable scan tool, read all codes, freeze-frame data and pending status. Note engine conditions when code set.
Visually inspect the injector 4 connector and wiring for damage, corrosion, poor seating, or water intrusion. Repair any obvious faults.
With connector connected, back-probe the supply pin for injector 4. Verify battery voltage with ignition ON. If missing, check injector fuse/relay and supply wiring.
Back-probe the injector driver pin while cranking or commanding injector ON from the tool. Confirm switching to ground (pulsing). If no switching, check ECU driver output wiring continuity to ECU.
Remove connector and measure injector coil resistance at the injector terminals. Compare to spec. An open or shorted injector indicates replacement.
Wiggle test the harness and connector while monitoring the signal or engine behavior to detect intermittent faults.
If resistance and supply are good but no driver signal, inspect continuity from injector connector to ECU and check ECU ground(s). Repair wiring as needed.
If wiring and supply are good but the injector still fails when commanded, swap injector 4 with another cylinder's injector. If the code/symptom moves with the injector, replace the injector. If it stays on cylinder 4, suspect wiring or ECU.
If tests point to ECU driver failure (no switching output but wiring/grounds OK), consult manufacturer service info before replacing ECU — check for TSBs or reprogramming.
After repair, clear codes and road-test to confirm the fault does not return; re-check for related misfire codes or drivability issues.

Likely causes

Damaged or corroded connector at injector 4
Injector 4 coil resistance out of specification (open or short)
Wiring harness fault between injector and ECU (open/short to power or ground)
Faulty injector driver transistor in ECU (less common)

Fault status

⚠️ Status

Manufacturer-specific code P1299: Injector 4 control malfunction detected by ECM. Indicates abnormal behavior in injector 4 control circuit or the injector itself.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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Code

P1299

LINCOLN P — Powertrain

Cylinder Head Temperature Sensor Detected Engine Overheating Condition

Brand: LINCOLN

Type: P — Powertrain

Views: UK: 18 EN: 43 RU: 24

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or short in injector 4 wiring (connector, harness, or pin)
Corroded or poorly seated injector connector
Faulty injector (coil open, shorted, or mechanically stuck)
Blown fuse or failed power supply/relay for injectors
Poor ground or high-resistance ground connection
Faulty ECU injector driver (internal short or open)

Symptoms

Check Engine light (MIL) illuminated
Rough idle or misfire, especially cylinder 4
Loss of power or uneven acceleration
Increased fuel consumption and possible smoke (diesel)
Possible hard starting or stalling

What to check

Read and record freeze-frame and live data with a scan tool; note status (continuous/pending)
Check related codes (misfire P03xx, injector circuit P0204) and stored data
Visually inspect injector 4 connector and wiring for corrosion, damage, or water
Check injector supply fuse and relay for proper operation
Measure injector 4 coil resistance with meter and compare to manufacturer spec
Back-probe injector connector to verify supply voltage (battery) and ECU switching signal while cranking

Signal parameters

Injector supply: approx. battery voltage (11–14 V) present at the + injector terminal with ignition ON
Injector driver output: low-side switching to ground; pulse voltage ~0 V when ON, open-circuit (near battery voltage) when OFF
Typical injector coil resistance: check factory spec; many petrol injectors 2–16 Ω (verify exact value for engine)
Pulse width: variable with engine load (milliseconds); present during cranking and running
Oscilloscope pattern: clean square pulses with stable rise/fall; noisy or clipped waveform indicates driver or wiring fault

Diagnostic algorithm

Connect a capable scan tool, read all codes, freeze-frame data and pending status. Note engine conditions when code set.
Visually inspect the injector 4 connector and wiring for damage, corrosion, poor seating, or water intrusion. Repair any obvious faults.
With connector connected, back-probe the supply pin for injector 4. Verify battery voltage with ignition ON. If missing, check injector fuse/relay and supply wiring.
Back-probe the injector driver pin while cranking or commanding injector ON from the tool. Confirm switching to ground (pulsing). If no switching, check ECU driver output wiring continuity to ECU.
Remove connector and measure injector coil resistance at the injector terminals. Compare to spec. An open or shorted injector indicates replacement.
Wiggle test the harness and connector while monitoring the signal or engine behavior to detect intermittent faults.
If resistance and supply are good but no driver signal, inspect continuity from injector connector to ECU and check ECU ground(s). Repair wiring as needed.
If wiring and supply are good but the injector still fails when commanded, swap injector 4 with another cylinder's injector. If the code/symptom moves with the injector, replace the injector. If it stays on cylinder 4, suspect wiring or ECU.
If tests point to ECU driver failure (no switching output but wiring/grounds OK), consult manufacturer service info before replacing ECU — check for TSBs or reprogramming.
After repair, clear codes and road-test to confirm the fault does not return; re-check for related misfire codes or drivability issues.

Likely causes

Damaged or corroded connector at injector 4
Injector 4 coil resistance out of specification (open or short)
Wiring harness fault between injector and ECU (open/short to power or ground)
Faulty injector driver transistor in ECU (less common)

Fault status

⚠️ Status

Manufacturer-specific code P1299: Injector 4 control malfunction detected by ECM. Indicates abnormal behavior in injector 4 control circuit or the injector itself.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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Code

P1299

MERCURY P — Powertrain

Cylinder Head Temperature Sensor Detected Engine Overheating Condition

Brand: MERCURY

Type: P — Powertrain

Views: UK: 18 EN: 43 RU: 24

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or short in injector 4 wiring (connector, harness, or pin)
Corroded or poorly seated injector connector
Faulty injector (coil open, shorted, or mechanically stuck)
Blown fuse or failed power supply/relay for injectors
Poor ground or high-resistance ground connection
Faulty ECU injector driver (internal short or open)

Symptoms

Check Engine light (MIL) illuminated
Rough idle or misfire, especially cylinder 4
Loss of power or uneven acceleration
Increased fuel consumption and possible smoke (diesel)
Possible hard starting or stalling

What to check

Read and record freeze-frame and live data with a scan tool; note status (continuous/pending)
Check related codes (misfire P03xx, injector circuit P0204) and stored data
Visually inspect injector 4 connector and wiring for corrosion, damage, or water
Check injector supply fuse and relay for proper operation
Measure injector 4 coil resistance with meter and compare to manufacturer spec
Back-probe injector connector to verify supply voltage (battery) and ECU switching signal while cranking

Signal parameters

Injector supply: approx. battery voltage (11–14 V) present at the + injector terminal with ignition ON
Injector driver output: low-side switching to ground; pulse voltage ~0 V when ON, open-circuit (near battery voltage) when OFF
Typical injector coil resistance: check factory spec; many petrol injectors 2–16 Ω (verify exact value for engine)
Pulse width: variable with engine load (milliseconds); present during cranking and running
Oscilloscope pattern: clean square pulses with stable rise/fall; noisy or clipped waveform indicates driver or wiring fault

Diagnostic algorithm

Connect a capable scan tool, read all codes, freeze-frame data and pending status. Note engine conditions when code set.
Visually inspect the injector 4 connector and wiring for damage, corrosion, poor seating, or water intrusion. Repair any obvious faults.
With connector connected, back-probe the supply pin for injector 4. Verify battery voltage with ignition ON. If missing, check injector fuse/relay and supply wiring.
Back-probe the injector driver pin while cranking or commanding injector ON from the tool. Confirm switching to ground (pulsing). If no switching, check ECU driver output wiring continuity to ECU.
Remove connector and measure injector coil resistance at the injector terminals. Compare to spec. An open or shorted injector indicates replacement.
Wiggle test the harness and connector while monitoring the signal or engine behavior to detect intermittent faults.
If resistance and supply are good but no driver signal, inspect continuity from injector connector to ECU and check ECU ground(s). Repair wiring as needed.
If wiring and supply are good but the injector still fails when commanded, swap injector 4 with another cylinder's injector. If the code/symptom moves with the injector, replace the injector. If it stays on cylinder 4, suspect wiring or ECU.
If tests point to ECU driver failure (no switching output but wiring/grounds OK), consult manufacturer service info before replacing ECU — check for TSBs or reprogramming.
After repair, clear codes and road-test to confirm the fault does not return; re-check for related misfire codes or drivability issues.

Likely causes

Damaged or corroded connector at injector 4
Injector 4 coil resistance out of specification (open or short)
Wiring harness fault between injector and ECU (open/short to power or ground)
Faulty injector driver transistor in ECU (less common)

Fault status

⚠️ Status

Manufacturer-specific code P1299: Injector 4 control malfunction detected by ECM. Indicates abnormal behavior in injector 4 control circuit or the injector itself.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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Code

P1299

Other P — Powertrain

Cylinder Head Overtemperature Protection Active

Brand: Other

Type: P — Powertrain

Views: UK: 21 EN: 47 RU: 29

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or short in injector 4 wiring (connector, harness, or pin)
Corroded or poorly seated injector connector
Faulty injector (coil open, shorted, or mechanically stuck)
Blown fuse or failed power supply/relay for injectors
Poor ground or high-resistance ground connection
Faulty ECU injector driver (internal short or open)

Symptoms

Check Engine light (MIL) illuminated
Rough idle or misfire, especially cylinder 4
Loss of power or uneven acceleration
Increased fuel consumption and possible smoke (diesel)
Possible hard starting or stalling

What to check

Read and record freeze-frame and live data with a scan tool; note status (continuous/pending)
Check related codes (misfire P03xx, injector circuit P0204) and stored data
Visually inspect injector 4 connector and wiring for corrosion, damage, or water
Check injector supply fuse and relay for proper operation
Measure injector 4 coil resistance with meter and compare to manufacturer spec
Back-probe injector connector to verify supply voltage (battery) and ECU switching signal while cranking

Signal parameters

Injector supply: approx. battery voltage (11–14 V) present at the + injector terminal with ignition ON
Injector driver output: low-side switching to ground; pulse voltage ~0 V when ON, open-circuit (near battery voltage) when OFF
Typical injector coil resistance: check factory spec; many petrol injectors 2–16 Ω (verify exact value for engine)
Pulse width: variable with engine load (milliseconds); present during cranking and running
Oscilloscope pattern: clean square pulses with stable rise/fall; noisy or clipped waveform indicates driver or wiring fault

Diagnostic algorithm

Connect a capable scan tool, read all codes, freeze-frame data and pending status. Note engine conditions when code set.
Visually inspect the injector 4 connector and wiring for damage, corrosion, poor seating, or water intrusion. Repair any obvious faults.
With connector connected, back-probe the supply pin for injector 4. Verify battery voltage with ignition ON. If missing, check injector fuse/relay and supply wiring.
Back-probe the injector driver pin while cranking or commanding injector ON from the tool. Confirm switching to ground (pulsing). If no switching, check ECU driver output wiring continuity to ECU.
Remove connector and measure injector coil resistance at the injector terminals. Compare to spec. An open or shorted injector indicates replacement.
Wiggle test the harness and connector while monitoring the signal or engine behavior to detect intermittent faults.
If resistance and supply are good but no driver signal, inspect continuity from injector connector to ECU and check ECU ground(s). Repair wiring as needed.
If wiring and supply are good but the injector still fails when commanded, swap injector 4 with another cylinder's injector. If the code/symptom moves with the injector, replace the injector. If it stays on cylinder 4, suspect wiring or ECU.
If tests point to ECU driver failure (no switching output but wiring/grounds OK), consult manufacturer service info before replacing ECU — check for TSBs or reprogramming.
After repair, clear codes and road-test to confirm the fault does not return; re-check for related misfire codes or drivability issues.

Likely causes

Damaged or corroded connector at injector 4
Injector 4 coil resistance out of specification (open or short)
Wiring harness fault between injector and ECU (open/short to power or ground)
Faulty injector driver transistor in ECU (less common)

Fault status

⚠️ Status

Manufacturer-specific code P1299: Injector 4 control malfunction detected by ECM. Indicates abnormal behavior in injector 4 control circuit or the injector itself.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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Code

P1299

PEUGEOT P — Powertrain

Injector 4 control malfunction

Brand: PEUGEOT

Type: P — Powertrain

Views: UK: 1 EN: 4 RU: 1

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or short in injector 4 wiring (connector, harness, or pin)
Corroded or poorly seated injector connector
Faulty injector (coil open, shorted, or mechanically stuck)
Blown fuse or failed power supply/relay for injectors
Poor ground or high-resistance ground connection
Faulty ECU injector driver (internal short or open)

Symptoms

Check Engine light (MIL) illuminated
Rough idle or misfire, especially cylinder 4
Loss of power or uneven acceleration
Increased fuel consumption and possible smoke (diesel)
Possible hard starting or stalling

What to check

Read and record freeze-frame and live data with a scan tool; note status (continuous/pending)
Check related codes (misfire P03xx, injector circuit P0204) and stored data
Visually inspect injector 4 connector and wiring for corrosion, damage, or water
Check injector supply fuse and relay for proper operation
Measure injector 4 coil resistance with meter and compare to manufacturer spec
Back-probe injector connector to verify supply voltage (battery) and ECU switching signal while cranking

Signal parameters

Injector supply: approx. battery voltage (11–14 V) present at the + injector terminal with ignition ON
Injector driver output: low-side switching to ground; pulse voltage ~0 V when ON, open-circuit (near battery voltage) when OFF
Typical injector coil resistance: check factory spec; many petrol injectors 2–16 Ω (verify exact value for engine)
Pulse width: variable with engine load (milliseconds); present during cranking and running
Oscilloscope pattern: clean square pulses with stable rise/fall; noisy or clipped waveform indicates driver or wiring fault

Diagnostic algorithm

Connect a capable scan tool, read all codes, freeze-frame data and pending status. Note engine conditions when code set.
Visually inspect the injector 4 connector and wiring for damage, corrosion, poor seating, or water intrusion. Repair any obvious faults.
With connector connected, back-probe the supply pin for injector 4. Verify battery voltage with ignition ON. If missing, check injector fuse/relay and supply wiring.
Back-probe the injector driver pin while cranking or commanding injector ON from the tool. Confirm switching to ground (pulsing). If no switching, check ECU driver output wiring continuity to ECU.
Remove connector and measure injector coil resistance at the injector terminals. Compare to spec. An open or shorted injector indicates replacement.
Wiggle test the harness and connector while monitoring the signal or engine behavior to detect intermittent faults.
If resistance and supply are good but no driver signal, inspect continuity from injector connector to ECU and check ECU ground(s). Repair wiring as needed.
If wiring and supply are good but the injector still fails when commanded, swap injector 4 with another cylinder's injector. If the code/symptom moves with the injector, replace the injector. If it stays on cylinder 4, suspect wiring or ECU.
If tests point to ECU driver failure (no switching output but wiring/grounds OK), consult manufacturer service info before replacing ECU — check for TSBs or reprogramming.
After repair, clear codes and road-test to confirm the fault does not return; re-check for related misfire codes or drivability issues.

Likely causes

Damaged or corroded connector at injector 4
Injector 4 coil resistance out of specification (open or short)
Wiring harness fault between injector and ECU (open/short to power or ground)
Faulty injector driver transistor in ECU (less common)

Fault status

⚠️ Status

Manufacturer-specific code P1299: Injector 4 control malfunction detected by ECM. Indicates abnormal behavior in injector 4 control circuit or the injector itself.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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Code

P1299

PLYMOUTH P — Powertrain

Vacuum Leak Found IAC Fully Seated

Brand: PLYMOUTH

Type: P — Powertrain

Views: UK: 18 EN: 42 RU: 28

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or short in injector 4 wiring (connector, harness, or pin)
Corroded or poorly seated injector connector
Faulty injector (coil open, shorted, or mechanically stuck)
Blown fuse or failed power supply/relay for injectors
Poor ground or high-resistance ground connection
Faulty ECU injector driver (internal short or open)

Symptoms

Check Engine light (MIL) illuminated
Rough idle or misfire, especially cylinder 4
Loss of power or uneven acceleration
Increased fuel consumption and possible smoke (diesel)
Possible hard starting or stalling

What to check

Read and record freeze-frame and live data with a scan tool; note status (continuous/pending)
Check related codes (misfire P03xx, injector circuit P0204) and stored data
Visually inspect injector 4 connector and wiring for corrosion, damage, or water
Check injector supply fuse and relay for proper operation
Measure injector 4 coil resistance with meter and compare to manufacturer spec
Back-probe injector connector to verify supply voltage (battery) and ECU switching signal while cranking

Signal parameters

Injector supply: approx. battery voltage (11–14 V) present at the + injector terminal with ignition ON
Injector driver output: low-side switching to ground; pulse voltage ~0 V when ON, open-circuit (near battery voltage) when OFF
Typical injector coil resistance: check factory spec; many petrol injectors 2–16 Ω (verify exact value for engine)
Pulse width: variable with engine load (milliseconds); present during cranking and running
Oscilloscope pattern: clean square pulses with stable rise/fall; noisy or clipped waveform indicates driver or wiring fault

Diagnostic algorithm

Connect a capable scan tool, read all codes, freeze-frame data and pending status. Note engine conditions when code set.
Visually inspect the injector 4 connector and wiring for damage, corrosion, poor seating, or water intrusion. Repair any obvious faults.
With connector connected, back-probe the supply pin for injector 4. Verify battery voltage with ignition ON. If missing, check injector fuse/relay and supply wiring.
Back-probe the injector driver pin while cranking or commanding injector ON from the tool. Confirm switching to ground (pulsing). If no switching, check ECU driver output wiring continuity to ECU.
Remove connector and measure injector coil resistance at the injector terminals. Compare to spec. An open or shorted injector indicates replacement.
Wiggle test the harness and connector while monitoring the signal or engine behavior to detect intermittent faults.
If resistance and supply are good but no driver signal, inspect continuity from injector connector to ECU and check ECU ground(s). Repair wiring as needed.
If wiring and supply are good but the injector still fails when commanded, swap injector 4 with another cylinder's injector. If the code/symptom moves with the injector, replace the injector. If it stays on cylinder 4, suspect wiring or ECU.
If tests point to ECU driver failure (no switching output but wiring/grounds OK), consult manufacturer service info before replacing ECU — check for TSBs or reprogramming.
After repair, clear codes and road-test to confirm the fault does not return; re-check for related misfire codes or drivability issues.

Likely causes

Damaged or corroded connector at injector 4
Injector 4 coil resistance out of specification (open or short)
Wiring harness fault between injector and ECU (open/short to power or ground)
Faulty injector driver transistor in ECU (less common)

Fault status

⚠️ Status

Manufacturer-specific code P1299: Injector 4 control malfunction detected by ECM. Indicates abnormal behavior in injector 4 control circuit or the injector itself.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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Code

P1299

PONTIAC P — Powertrain

Vacuum Leak Found IAC Fully Seated

Brand: PONTIAC

Type: P — Powertrain

Views: UK: 23 EN: 51 RU: 28

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or short in injector 4 wiring (connector, harness, or pin)
Corroded or poorly seated injector connector
Faulty injector (coil open, shorted, or mechanically stuck)
Blown fuse or failed power supply/relay for injectors
Poor ground or high-resistance ground connection
Faulty ECU injector driver (internal short or open)

Symptoms

Check Engine light (MIL) illuminated
Rough idle or misfire, especially cylinder 4
Loss of power or uneven acceleration
Increased fuel consumption and possible smoke (diesel)
Possible hard starting or stalling

What to check

Read and record freeze-frame and live data with a scan tool; note status (continuous/pending)
Check related codes (misfire P03xx, injector circuit P0204) and stored data
Visually inspect injector 4 connector and wiring for corrosion, damage, or water
Check injector supply fuse and relay for proper operation
Measure injector 4 coil resistance with meter and compare to manufacturer spec
Back-probe injector connector to verify supply voltage (battery) and ECU switching signal while cranking

Signal parameters

Injector supply: approx. battery voltage (11–14 V) present at the + injector terminal with ignition ON
Injector driver output: low-side switching to ground; pulse voltage ~0 V when ON, open-circuit (near battery voltage) when OFF
Typical injector coil resistance: check factory spec; many petrol injectors 2–16 Ω (verify exact value for engine)
Pulse width: variable with engine load (milliseconds); present during cranking and running
Oscilloscope pattern: clean square pulses with stable rise/fall; noisy or clipped waveform indicates driver or wiring fault

Diagnostic algorithm

Connect a capable scan tool, read all codes, freeze-frame data and pending status. Note engine conditions when code set.
Visually inspect the injector 4 connector and wiring for damage, corrosion, poor seating, or water intrusion. Repair any obvious faults.
With connector connected, back-probe the supply pin for injector 4. Verify battery voltage with ignition ON. If missing, check injector fuse/relay and supply wiring.
Back-probe the injector driver pin while cranking or commanding injector ON from the tool. Confirm switching to ground (pulsing). If no switching, check ECU driver output wiring continuity to ECU.
Remove connector and measure injector coil resistance at the injector terminals. Compare to spec. An open or shorted injector indicates replacement.
Wiggle test the harness and connector while monitoring the signal or engine behavior to detect intermittent faults.
If resistance and supply are good but no driver signal, inspect continuity from injector connector to ECU and check ECU ground(s). Repair wiring as needed.
If wiring and supply are good but the injector still fails when commanded, swap injector 4 with another cylinder's injector. If the code/symptom moves with the injector, replace the injector. If it stays on cylinder 4, suspect wiring or ECU.
If tests point to ECU driver failure (no switching output but wiring/grounds OK), consult manufacturer service info before replacing ECU — check for TSBs or reprogramming.
After repair, clear codes and road-test to confirm the fault does not return; re-check for related misfire codes or drivability issues.

Likely causes

Damaged or corroded connector at injector 4
Injector 4 coil resistance out of specification (open or short)
Wiring harness fault between injector and ECU (open/short to power or ground)
Faulty injector driver transistor in ECU (less common)

Fault status

⚠️ Status

Manufacturer-specific code P1299: Injector 4 control malfunction detected by ECM. Indicates abnormal behavior in injector 4 control circuit or the injector itself.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

Your experience will help others

+100 karma for a short comment :)

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Code

P1299

RAM P — Powertrain

Vacuum Leak detected (IAC fully seated)

Brand: RAM

Type: P — Powertrain

Views: UK: 1 EN: 4 RU: 1

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or short in injector 4 wiring (connector, harness, or pin)
Corroded or poorly seated injector connector
Faulty injector (coil open, shorted, or mechanically stuck)
Blown fuse or failed power supply/relay for injectors
Poor ground or high-resistance ground connection
Faulty ECU injector driver (internal short or open)

Symptoms

Check Engine light (MIL) illuminated
Rough idle or misfire, especially cylinder 4
Loss of power or uneven acceleration
Increased fuel consumption and possible smoke (diesel)
Possible hard starting or stalling

What to check

Read and record freeze-frame and live data with a scan tool; note status (continuous/pending)
Check related codes (misfire P03xx, injector circuit P0204) and stored data
Visually inspect injector 4 connector and wiring for corrosion, damage, or water
Check injector supply fuse and relay for proper operation
Measure injector 4 coil resistance with meter and compare to manufacturer spec
Back-probe injector connector to verify supply voltage (battery) and ECU switching signal while cranking

Signal parameters

Injector supply: approx. battery voltage (11–14 V) present at the + injector terminal with ignition ON
Injector driver output: low-side switching to ground; pulse voltage ~0 V when ON, open-circuit (near battery voltage) when OFF
Typical injector coil resistance: check factory spec; many petrol injectors 2–16 Ω (verify exact value for engine)
Pulse width: variable with engine load (milliseconds); present during cranking and running
Oscilloscope pattern: clean square pulses with stable rise/fall; noisy or clipped waveform indicates driver or wiring fault

Diagnostic algorithm

Connect a capable scan tool, read all codes, freeze-frame data and pending status. Note engine conditions when code set.
Visually inspect the injector 4 connector and wiring for damage, corrosion, poor seating, or water intrusion. Repair any obvious faults.
With connector connected, back-probe the supply pin for injector 4. Verify battery voltage with ignition ON. If missing, check injector fuse/relay and supply wiring.
Back-probe the injector driver pin while cranking or commanding injector ON from the tool. Confirm switching to ground (pulsing). If no switching, check ECU driver output wiring continuity to ECU.
Remove connector and measure injector coil resistance at the injector terminals. Compare to spec. An open or shorted injector indicates replacement.
Wiggle test the harness and connector while monitoring the signal or engine behavior to detect intermittent faults.
If resistance and supply are good but no driver signal, inspect continuity from injector connector to ECU and check ECU ground(s). Repair wiring as needed.
If wiring and supply are good but the injector still fails when commanded, swap injector 4 with another cylinder's injector. If the code/symptom moves with the injector, replace the injector. If it stays on cylinder 4, suspect wiring or ECU.
If tests point to ECU driver failure (no switching output but wiring/grounds OK), consult manufacturer service info before replacing ECU — check for TSBs or reprogramming.
After repair, clear codes and road-test to confirm the fault does not return; re-check for related misfire codes or drivability issues.

Likely causes

Damaged or corroded connector at injector 4
Injector 4 coil resistance out of specification (open or short)
Wiring harness fault between injector and ECU (open/short to power or ground)
Faulty injector driver transistor in ECU (less common)

Fault status

⚠️ Status

Manufacturer-specific code P1299: Injector 4 control malfunction detected by ECM. Indicates abnormal behavior in injector 4 control circuit or the injector itself.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

Your experience will help others

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