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Home / DTC / P0350 — Ignition Coil Primary/Secondary Circuit/Open

P0350 — Ignition Coil Primary/Secondary Circuit/Open

Detailed page for trouble code P0350.

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P0350

Generic P — Powertrain

Ignition Coil Primary/Secondary Circuit/Open

Brand: Generic
Type: P — Powertrain
Views: UK: 19 EN: 32 RU: 41
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or high-resistance wiring in ignition coil primary circuit (broken wire, chafed harness)
  • Corroded/loose connector or poor ground at ignition coil
  • Failed ignition coil (open primary winding or shorted secondary)
  • Faulty ignition coil driver inside ECM/PCM
  • Blown fuse or faulty relay supplying coil power
  • Short to power or short to ground in coil circuit

Symptoms

  • Check Engine (MIL) illuminated
  • Misfire on one or more cylinders or increased misfire counts
  • Hard starting or no-start condition (if coil open)
  • Rough idle and reduced engine power
  • Increased fuel consumption and failed emissions test
  • Intermittent operation if connector/harness is intermittent

What to check

  • Read and record all codes and freeze-frame data with a scan tool; note cylinder number(s) affected
  • Visual inspection of coil(s), connectors, wiring harness for damage, corrosion, oil or water
  • Check related fuses and power/ground circuits for the coils
  • Verify battery voltage at coil power feed with ignition ON
  • Measure coil primary and secondary resistance against manufacturer specs
  • Wiggle-test wiring and connectors while monitoring for changes or code set

Signal parameters

  • Primary supply voltage (key ON/run): ~11–14.5 V (should be near battery voltage)
  • Typical primary resistance (varies by manufacturer): ~0.1–2.0 ohms for low-voltage primaries; some coils higher — consult service data
  • Typical secondary resistance (varies): ~3 k–20 k ohms depending on coil design — consult service data
  • Coil driver switching/dwell: pulse width typically 1–8 ms depending on engine speed/load (varies by vehicle)
  • Expected coil primary waveform: square pulses from ECM/PCM; absence = open or driver fault; distorted waveform = short/high resistance or bad driver

Diagnostic algorithm

  1. Verify the P0350 code and note freeze-frame and related misfire codes (P03xx) with a scan tool.
  2. Perform a visual inspection of ignition coils, harness, connectors, and grounds for damage, corrosion, oil or water intrusion.
  3. Check fuses/relays supplying coil power; restore if blown and re-check for code recurrence.
  4. With ignition OFF, disconnect coil connector and inspect terminals; repair or clean corrosion and re-secure.
  5. Measure coil primary resistance and continuity between coil primary terminal and ground per service specifications. An open or out-of-range reading indicates a bad coil.
  6. Check for battery voltage at the coil power feed with ignition ON. If no voltage, trace supply circuit and repair wiring or relay/fuse.
  7. Back-probe coil driver terminal (primary side) with a multimeter or oscilloscope while cranking/starting to check for switching signal from ECM. No switching but good supply suggests ECM/PCM driver fault; switching present suggests coil fault.
  8. Swap the suspect coil with a known-good coil of the same type (if coils are coil-on-plug or modular) and see if the fault/misfire follows the coil.
  9. If the coil follows the fault, replace the coil. If the fault remains on the same cylinder after swapping, further trace the wiring harness between coil and ECM and test for opens/shorts.
  10. If wiring checks good and coil replacement does not clear the code, test or replace the ECM/PCM per manufacturer procedures.
  11. Clear codes and perform a test drive to confirm repair; monitor live data and misfire counters to ensure proper operation.

Likely causes

  • Faulty ignition coil or coil pack
  • Open or disconnected coil primary lead or corroded connector
  • Low battery/supply voltage or blown fuse to coil circuit
  • Poor ground at engine harness or coil mounting point
  • PCM driver failure (less common)

Fault status

⚠️ Status
Ignition coil primary/secondary circuit fault detected — open/short or driver issue. Inspect coil, wiring, connectors and ECM driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

P0351 P0352 P0353 P0354 P0355 P0356
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Code

P0350

GWM P — Powertrain

- Ignition Coil Primary / Secondary Circuit Malfunction

Brand: GWM
Type: P — Powertrain
Views: UK: 7 EN: 15 RU: 12
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or high-resistance wiring in ignition coil primary circuit (broken wire, chafed harness)
  • Corroded/loose connector or poor ground at ignition coil
  • Failed ignition coil (open primary winding or shorted secondary)
  • Faulty ignition coil driver inside ECM/PCM
  • Blown fuse or faulty relay supplying coil power
  • Short to power or short to ground in coil circuit

Symptoms

  • Check Engine (MIL) illuminated
  • Misfire on one or more cylinders or increased misfire counts
  • Hard starting or no-start condition (if coil open)
  • Rough idle and reduced engine power
  • Increased fuel consumption and failed emissions test
  • Intermittent operation if connector/harness is intermittent

What to check

  • Read and record all codes and freeze-frame data with a scan tool; note cylinder number(s) affected
  • Visual inspection of coil(s), connectors, wiring harness for damage, corrosion, oil or water
  • Check related fuses and power/ground circuits for the coils
  • Verify battery voltage at coil power feed with ignition ON
  • Measure coil primary and secondary resistance against manufacturer specs
  • Wiggle-test wiring and connectors while monitoring for changes or code set

Signal parameters

  • Primary supply voltage (key ON/run): ~11–14.5 V (should be near battery voltage)
  • Typical primary resistance (varies by manufacturer): ~0.1–2.0 ohms for low-voltage primaries; some coils higher — consult service data
  • Typical secondary resistance (varies): ~3 k–20 k ohms depending on coil design — consult service data
  • Coil driver switching/dwell: pulse width typically 1–8 ms depending on engine speed/load (varies by vehicle)
  • Expected coil primary waveform: square pulses from ECM/PCM; absence = open or driver fault; distorted waveform = short/high resistance or bad driver

Diagnostic algorithm

  1. Verify the P0350 code and note freeze-frame and related misfire codes (P03xx) with a scan tool.
  2. Perform a visual inspection of ignition coils, harness, connectors, and grounds for damage, corrosion, oil or water intrusion.
  3. Check fuses/relays supplying coil power; restore if blown and re-check for code recurrence.
  4. With ignition OFF, disconnect coil connector and inspect terminals; repair or clean corrosion and re-secure.
  5. Measure coil primary resistance and continuity between coil primary terminal and ground per service specifications. An open or out-of-range reading indicates a bad coil.
  6. Check for battery voltage at the coil power feed with ignition ON. If no voltage, trace supply circuit and repair wiring or relay/fuse.
  7. Back-probe coil driver terminal (primary side) with a multimeter or oscilloscope while cranking/starting to check for switching signal from ECM. No switching but good supply suggests ECM/PCM driver fault; switching present suggests coil fault.
  8. Swap the suspect coil with a known-good coil of the same type (if coils are coil-on-plug or modular) and see if the fault/misfire follows the coil.
  9. If the coil follows the fault, replace the coil. If the fault remains on the same cylinder after swapping, further trace the wiring harness between coil and ECM and test for opens/shorts.
  10. If wiring checks good and coil replacement does not clear the code, test or replace the ECM/PCM per manufacturer procedures.
  11. Clear codes and perform a test drive to confirm repair; monitor live data and misfire counters to ensure proper operation.

Likely causes

  • Faulty ignition coil or coil pack
  • Open or disconnected coil primary lead or corroded connector
  • Low battery/supply voltage or blown fuse to coil circuit
  • Poor ground at engine harness or coil mounting point
  • PCM driver failure (less common)

Fault status

⚠️ Status
Ignition coil primary/secondary circuit fault detected — open/short or driver issue. Inspect coil, wiring, connectors and ECM driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

P0351 P0352 P0353 P0354 P0355 P0356
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P0350

HUMMER P — Powertrain

Ignition Coil Primary/Secondary Circuit Malfunction

Brand: HUMMER
Type: P — Powertrain
Views: UK: 12 EN: 24 RU: 30
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or high-resistance wiring in ignition coil primary circuit (broken wire, chafed harness)
  • Corroded/loose connector or poor ground at ignition coil
  • Failed ignition coil (open primary winding or shorted secondary)
  • Faulty ignition coil driver inside ECM/PCM
  • Blown fuse or faulty relay supplying coil power
  • Short to power or short to ground in coil circuit

Symptoms

  • Check Engine (MIL) illuminated
  • Misfire on one or more cylinders or increased misfire counts
  • Hard starting or no-start condition (if coil open)
  • Rough idle and reduced engine power
  • Increased fuel consumption and failed emissions test
  • Intermittent operation if connector/harness is intermittent

What to check

  • Read and record all codes and freeze-frame data with a scan tool; note cylinder number(s) affected
  • Visual inspection of coil(s), connectors, wiring harness for damage, corrosion, oil or water
  • Check related fuses and power/ground circuits for the coils
  • Verify battery voltage at coil power feed with ignition ON
  • Measure coil primary and secondary resistance against manufacturer specs
  • Wiggle-test wiring and connectors while monitoring for changes or code set

Signal parameters

  • Primary supply voltage (key ON/run): ~11–14.5 V (should be near battery voltage)
  • Typical primary resistance (varies by manufacturer): ~0.1–2.0 ohms for low-voltage primaries; some coils higher — consult service data
  • Typical secondary resistance (varies): ~3 k–20 k ohms depending on coil design — consult service data
  • Coil driver switching/dwell: pulse width typically 1–8 ms depending on engine speed/load (varies by vehicle)
  • Expected coil primary waveform: square pulses from ECM/PCM; absence = open or driver fault; distorted waveform = short/high resistance or bad driver

Diagnostic algorithm

  1. Verify the P0350 code and note freeze-frame and related misfire codes (P03xx) with a scan tool.
  2. Perform a visual inspection of ignition coils, harness, connectors, and grounds for damage, corrosion, oil or water intrusion.
  3. Check fuses/relays supplying coil power; restore if blown and re-check for code recurrence.
  4. With ignition OFF, disconnect coil connector and inspect terminals; repair or clean corrosion and re-secure.
  5. Measure coil primary resistance and continuity between coil primary terminal and ground per service specifications. An open or out-of-range reading indicates a bad coil.
  6. Check for battery voltage at the coil power feed with ignition ON. If no voltage, trace supply circuit and repair wiring or relay/fuse.
  7. Back-probe coil driver terminal (primary side) with a multimeter or oscilloscope while cranking/starting to check for switching signal from ECM. No switching but good supply suggests ECM/PCM driver fault; switching present suggests coil fault.
  8. Swap the suspect coil with a known-good coil of the same type (if coils are coil-on-plug or modular) and see if the fault/misfire follows the coil.
  9. If the coil follows the fault, replace the coil. If the fault remains on the same cylinder after swapping, further trace the wiring harness between coil and ECM and test for opens/shorts.
  10. If wiring checks good and coil replacement does not clear the code, test or replace the ECM/PCM per manufacturer procedures.
  11. Clear codes and perform a test drive to confirm repair; monitor live data and misfire counters to ensure proper operation.

Likely causes

  • Faulty ignition coil or coil pack
  • Open or disconnected coil primary lead or corroded connector
  • Low battery/supply voltage or blown fuse to coil circuit
  • Poor ground at engine harness or coil mounting point
  • PCM driver failure (less common)

Fault status

⚠️ Status
Ignition coil primary/secondary circuit fault detected — open/short or driver issue. Inspect coil, wiring, connectors and ECM driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

P0351 P0352 P0353 P0354 P0355 P0356
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HUMMER 2010 Hummer H3T Base

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Hummer H3T Base Years: 2010 Manual in English Sections: 37,425 AI chunks: 37,425
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HUMMER · Hummer H3T Base · 2010
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Code

P0350

LAND ROVER P — Powertrain

Malfunction of the primary circuit of the ignition coil

Brand: LAND ROVER
Type: P — Powertrain
Views: UK: 8 EN: 20 RU: 21
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Page language: EN

Causes

  • Open or high-resistance wiring in ignition coil primary circuit (broken wire, chafed harness)
  • Corroded/loose connector or poor ground at ignition coil
  • Failed ignition coil (open primary winding or shorted secondary)
  • Faulty ignition coil driver inside ECM/PCM
  • Blown fuse or faulty relay supplying coil power
  • Short to power or short to ground in coil circuit

Symptoms

  • Check Engine (MIL) illuminated
  • Misfire on one or more cylinders or increased misfire counts
  • Hard starting or no-start condition (if coil open)
  • Rough idle and reduced engine power
  • Increased fuel consumption and failed emissions test
  • Intermittent operation if connector/harness is intermittent

What to check

  • Read and record all codes and freeze-frame data with a scan tool; note cylinder number(s) affected
  • Visual inspection of coil(s), connectors, wiring harness for damage, corrosion, oil or water
  • Check related fuses and power/ground circuits for the coils
  • Verify battery voltage at coil power feed with ignition ON
  • Measure coil primary and secondary resistance against manufacturer specs
  • Wiggle-test wiring and connectors while monitoring for changes or code set

Signal parameters

  • Primary supply voltage (key ON/run): ~11–14.5 V (should be near battery voltage)
  • Typical primary resistance (varies by manufacturer): ~0.1–2.0 ohms for low-voltage primaries; some coils higher — consult service data
  • Typical secondary resistance (varies): ~3 k–20 k ohms depending on coil design — consult service data
  • Coil driver switching/dwell: pulse width typically 1–8 ms depending on engine speed/load (varies by vehicle)
  • Expected coil primary waveform: square pulses from ECM/PCM; absence = open or driver fault; distorted waveform = short/high resistance or bad driver

Diagnostic algorithm

  1. Verify the P0350 code and note freeze-frame and related misfire codes (P03xx) with a scan tool.
  2. Perform a visual inspection of ignition coils, harness, connectors, and grounds for damage, corrosion, oil or water intrusion.
  3. Check fuses/relays supplying coil power; restore if blown and re-check for code recurrence.
  4. With ignition OFF, disconnect coil connector and inspect terminals; repair or clean corrosion and re-secure.
  5. Measure coil primary resistance and continuity between coil primary terminal and ground per service specifications. An open or out-of-range reading indicates a bad coil.
  6. Check for battery voltage at the coil power feed with ignition ON. If no voltage, trace supply circuit and repair wiring or relay/fuse.
  7. Back-probe coil driver terminal (primary side) with a multimeter or oscilloscope while cranking/starting to check for switching signal from ECM. No switching but good supply suggests ECM/PCM driver fault; switching present suggests coil fault.
  8. Swap the suspect coil with a known-good coil of the same type (if coils are coil-on-plug or modular) and see if the fault/misfire follows the coil.
  9. If the coil follows the fault, replace the coil. If the fault remains on the same cylinder after swapping, further trace the wiring harness between coil and ECM and test for opens/shorts.
  10. If wiring checks good and coil replacement does not clear the code, test or replace the ECM/PCM per manufacturer procedures.
  11. Clear codes and perform a test drive to confirm repair; monitor live data and misfire counters to ensure proper operation.

Likely causes

  • Faulty ignition coil or coil pack
  • Open or disconnected coil primary lead or corroded connector
  • Low battery/supply voltage or blown fuse to coil circuit
  • Poor ground at engine harness or coil mounting point
  • PCM driver failure (less common)

Fault status

⚠️ Status
Ignition coil primary/secondary circuit fault detected — open/short or driver issue. Inspect coil, wiring, connectors and ECM driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

P0351 P0352 P0353 P0354 P0355 P0356
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