Code
P0361
Generic
P — Powertrain
Ignition Coil K Primary Control Circuit/Open
Views:
UK: 15
EN: 20
RU: 14
AI status
Completed
Completed
100%
Causes
- Open or high-resistance wiring in the coil primary circuit
- Disconnected, corroded or damaged coil connector
- Failed ignition coil (primary winding or internal driver)
- Faulty ignition control module / coil driver in PCM/ECM
- Blown fuse or faulty power/ground supply to coil bank
- Short to battery voltage or short to ground in the circuit
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Rough idle or engine misfire on the affected cylinder
- Reduced engine power, hesitation or stumble under load
- Poor fuel economy
- Possible no-start if multiple coil circuits fail
- Stored misfire or coil circuit-related DTCs
What to check
- Read freeze frame and live data with a scan tool; note which cylinder is coil 'K' on this vehicle.
- Visually inspect coil pack, connector, harness, and ECM connector for damage, corrosion, or loose pins.
- Check ignition/ECU fuses and ignition relay for continuity and proper supply voltage.
- Perform a wiggle test while monitoring live data for intermittent changes.
- Measure battery voltage at coil power terminal with key ON and while cranking.
- Measure primary coil resistance (specs vary by vehicle) and compare to known good value.
Signal parameters
- Primary coil resistance (typical range): ~0.2–2.0 ohm (varies by design) — consult OEM spec
- Secondary coil resistance (typical reference): ~5 k–20 k ohm (varies) — consult OEM spec
- Supply voltage to coil power terminal: ~12 V with key ON/cranking
- Primary waveform: switching pulses from PCM, 0–12 V (or ground switching), with dwell typically 1–5 ms depending on engine speed and ECU strategy
- No primary current or open circuit indication when PCM commands the coil is the trigger condition for P0361
Diagnostic algorithm
- Safety: work with ignition off, battery disconnected for connector/continuity work. Follow vehicle-specific procedures.
- Retrieve and record freeze frame & related codes (misfire codes may also be present). Clear codes and attempt to reproduce.
- Identify which cylinder/coil is labeled 'K' for this vehicle (service manual).
- Visually inspect coil, connector, wiring and PCM connector for damage, corrosion or bent pins.
- Verify battery voltage at coil power pin with key ON. Check ground at coil ground/engine ground.
- Remove coil connector and measure primary coil resistance across the primary pins. Compare to spec. If open or out of range, replace coil.
- Check continuity between coil primary control pin and PCM driver pin. Measure resistance; look for open/high resistance or short to B+/-.
- Check for short to battery voltage on the control wire (would show battery voltage when coil should be off) and for short to ground (low resistance to ground).
- If wiring and supply are good, swap coils with an identical known-good coil. If the code follows the coil, replace the coil.
- If the code remains on the same cylinder after swapping coils, inspect/repair wiring or replace ECM if testing confirms a faulty driver (confirm with scope or manufacturer procedures).
- After repairs, clear codes and road test; verify the code does not return and engine runs normally.
Likely causes
- Broken wire or poor pin connection at the coil connector
- Faulty ignition coil at cylinder corresponding to coil 'K' (coil pack or COP)
- Open or shorted trace/pin between coil and PCM
- Bad PCM driver (less common after wiring and coil are verified)
- Blown ignition fuse or relay feeding the coil bank
Fault status
Status
PCM detected open/abnormal condition in ignition coil K primary control circuit (no expected primary current/voltage when commanded). MIL on.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P0361
GWM
P — Powertrain
- Malfunction in the ignition coil primary / secondary circuit K
Views:
UK: 0
EN: 0
RU: 1
AI status
Completed
Completed
100%
Causes
- Open or high-resistance wiring in the coil primary circuit
- Disconnected, corroded or damaged coil connector
- Failed ignition coil (primary winding or internal driver)
- Faulty ignition control module / coil driver in PCM/ECM
- Blown fuse or faulty power/ground supply to coil bank
- Short to battery voltage or short to ground in the circuit
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Rough idle or engine misfire on the affected cylinder
- Reduced engine power, hesitation or stumble under load
- Poor fuel economy
- Possible no-start if multiple coil circuits fail
- Stored misfire or coil circuit-related DTCs
What to check
- Read freeze frame and live data with a scan tool; note which cylinder is coil 'K' on this vehicle.
- Visually inspect coil pack, connector, harness, and ECM connector for damage, corrosion, or loose pins.
- Check ignition/ECU fuses and ignition relay for continuity and proper supply voltage.
- Perform a wiggle test while monitoring live data for intermittent changes.
- Measure battery voltage at coil power terminal with key ON and while cranking.
- Measure primary coil resistance (specs vary by vehicle) and compare to known good value.
Signal parameters
- Primary coil resistance (typical range): ~0.2–2.0 ohm (varies by design) — consult OEM spec
- Secondary coil resistance (typical reference): ~5 k–20 k ohm (varies) — consult OEM spec
- Supply voltage to coil power terminal: ~12 V with key ON/cranking
- Primary waveform: switching pulses from PCM, 0–12 V (or ground switching), with dwell typically 1–5 ms depending on engine speed and ECU strategy
- No primary current or open circuit indication when PCM commands the coil is the trigger condition for P0361
Diagnostic algorithm
- Safety: work with ignition off, battery disconnected for connector/continuity work. Follow vehicle-specific procedures.
- Retrieve and record freeze frame & related codes (misfire codes may also be present). Clear codes and attempt to reproduce.
- Identify which cylinder/coil is labeled 'K' for this vehicle (service manual).
- Visually inspect coil, connector, wiring and PCM connector for damage, corrosion or bent pins.
- Verify battery voltage at coil power pin with key ON. Check ground at coil ground/engine ground.
- Remove coil connector and measure primary coil resistance across the primary pins. Compare to spec. If open or out of range, replace coil.
- Check continuity between coil primary control pin and PCM driver pin. Measure resistance; look for open/high resistance or short to B+/-.
- Check for short to battery voltage on the control wire (would show battery voltage when coil should be off) and for short to ground (low resistance to ground).
- If wiring and supply are good, swap coils with an identical known-good coil. If the code follows the coil, replace the coil.
- If the code remains on the same cylinder after swapping coils, inspect/repair wiring or replace ECM if testing confirms a faulty driver (confirm with scope or manufacturer procedures).
- After repairs, clear codes and road test; verify the code does not return and engine runs normally.
Likely causes
- Broken wire or poor pin connection at the coil connector
- Faulty ignition coil at cylinder corresponding to coil 'K' (coil pack or COP)
- Open or shorted trace/pin between coil and PCM
- Bad PCM driver (less common after wiring and coil are verified)
- Blown ignition fuse or relay feeding the coil bank
Fault status
Status
PCM detected open/abnormal condition in ignition coil K primary control circuit (no expected primary current/voltage when commanded). MIL on.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P0361
HUMMER
P — Powertrain
Ignition Coil K Primary/Secondary Circuit Malfunction
Views:
UK: 5
EN: 6
RU: 7
AI status
Completed
Completed
100%
Causes
- Open or high-resistance wiring in the coil primary circuit
- Disconnected, corroded or damaged coil connector
- Failed ignition coil (primary winding or internal driver)
- Faulty ignition control module / coil driver in PCM/ECM
- Blown fuse or faulty power/ground supply to coil bank
- Short to battery voltage or short to ground in the circuit
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Rough idle or engine misfire on the affected cylinder
- Reduced engine power, hesitation or stumble under load
- Poor fuel economy
- Possible no-start if multiple coil circuits fail
- Stored misfire or coil circuit-related DTCs
What to check
- Read freeze frame and live data with a scan tool; note which cylinder is coil 'K' on this vehicle.
- Visually inspect coil pack, connector, harness, and ECM connector for damage, corrosion, or loose pins.
- Check ignition/ECU fuses and ignition relay for continuity and proper supply voltage.
- Perform a wiggle test while monitoring live data for intermittent changes.
- Measure battery voltage at coil power terminal with key ON and while cranking.
- Measure primary coil resistance (specs vary by vehicle) and compare to known good value.
Signal parameters
- Primary coil resistance (typical range): ~0.2–2.0 ohm (varies by design) — consult OEM spec
- Secondary coil resistance (typical reference): ~5 k–20 k ohm (varies) — consult OEM spec
- Supply voltage to coil power terminal: ~12 V with key ON/cranking
- Primary waveform: switching pulses from PCM, 0–12 V (or ground switching), with dwell typically 1–5 ms depending on engine speed and ECU strategy
- No primary current or open circuit indication when PCM commands the coil is the trigger condition for P0361
Diagnostic algorithm
- Safety: work with ignition off, battery disconnected for connector/continuity work. Follow vehicle-specific procedures.
- Retrieve and record freeze frame & related codes (misfire codes may also be present). Clear codes and attempt to reproduce.
- Identify which cylinder/coil is labeled 'K' for this vehicle (service manual).
- Visually inspect coil, connector, wiring and PCM connector for damage, corrosion or bent pins.
- Verify battery voltage at coil power pin with key ON. Check ground at coil ground/engine ground.
- Remove coil connector and measure primary coil resistance across the primary pins. Compare to spec. If open or out of range, replace coil.
- Check continuity between coil primary control pin and PCM driver pin. Measure resistance; look for open/high resistance or short to B+/-.
- Check for short to battery voltage on the control wire (would show battery voltage when coil should be off) and for short to ground (low resistance to ground).
- If wiring and supply are good, swap coils with an identical known-good coil. If the code follows the coil, replace the coil.
- If the code remains on the same cylinder after swapping coils, inspect/repair wiring or replace ECM if testing confirms a faulty driver (confirm with scope or manufacturer procedures).
- After repairs, clear codes and road test; verify the code does not return and engine runs normally.
Likely causes
- Broken wire or poor pin connection at the coil connector
- Faulty ignition coil at cylinder corresponding to coil 'K' (coil pack or COP)
- Open or shorted trace/pin between coil and PCM
- Bad PCM driver (less common after wiring and coil are verified)
- Blown ignition fuse or relay feeding the coil bank
Fault status
Status
PCM detected open/abnormal condition in ignition coil K primary control circuit (no expected primary current/voltage when commanded). MIL on.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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+100 karma for a short comment :)
Was this AI description helpful?
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👍 Like
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