Code
P0362
Generic
P — Powertrain
Ignition Coil L Primary Control Circuit/Open
Views:
UK: 17
EN: 16
RU: 17
AI status
Completed
Completed
100%
Causes
- Open or short in the ignition coil primary wiring (connector, harness, chafing)
- Corroded or loose coil connector or terminal
- Failed ignition coil (internal open primary winding or internal short)
- Faulty PCM/ignition driver transistor
- Poor battery or chassis ground at coil or PCM
- Water intrusion or contamination at coil/connector
Symptoms
- Check Engine Light (MIL) illuminated
- Misfire on the cylinder served by coil L, rough idle
- Reduced engine power, hesitation or stumbling
- Increased fuel consumption and emissions
- Possible difficulty starting or stalling
- Misfire-related vibrations under load or at idle
What to check
- Scan tool: confirm P0362 is current, review freeze frame and misfire counts
- Visually inspect coil L connector, wiring harness and nearby components for damage, corrosion or moisture
- Check for related DTCs (other coil circuits or misfire codes P030x)
- Verify battery voltage and engine grounds
- Backprobe coil connector to check for 12V supply and ground/driver signal
- Measure coil primary and secondary resistance with a multimeter
Signal parameters
- Nominal coil primary resistance (typical range): 0.3–3.0 ohms (varies by coil design)
- Nominal coil secondary resistance (typical range): 5 kΩ–20 kΩ (varies by coil design)
- Coil supply: battery voltage (~11–14.5 V with engine on) present at the power feed pin with key ON
- Control signal: PCM should switch the coil primary to ground (pulsed) during cranking/running — waveform: pulsed ground at dwell frequency
- Open-circuit condition: infinite ohms on primary or no pulsed signal from PCM
- Short-to-ground: near 0 ohms to ground on the power feed when PCM not commanding
Diagnostic algorithm
- Verify the code and note freeze-frame data with a scan tool. Clear codes and attempt to reproduce.
- Perform a visual inspection of coil L connector, pins and wiring for corrosion, bent pins, heat damage or water intrusion. Repair any obvious damage.
- Check vehicle battery voltage and engine/chassis grounds. Repair poor grounds or low battery condition.
- With ignition OFF, disconnect coil L and measure primary resistance across the coil primary terminals. Compare to manufacturer spec (if unknown, compare to other coils on engine). Replace coil if primary is open or out of spec.
- Check for power at the coil power feed terminal with key ON (should see battery voltage). If there is no power, trace and repair the feed circuit (fuse, relay, wiring).
- Backprobe the coil control/driver pin with ignition ON and cranking; observe with a multimeter or ideally an oscilloscope. Expect pulsed grounding by the PCM. If no pulses, suspect wiring or PCM driver.
- Check wiring continuity between coil connector and PCM pin; check for shorts to ground or to battery. Repair any breaks or shorts.
- Swap coil L with a known-good coil from another cylinder (if practical) and see if the code follows the coil. If code moves with coil, replace coil.
- If wiring and coil are good but no driver signal is present, test/replace PCM or inspect PCM grounds and connectors. Refer to manufacturer procedures before replacing PCM.
- After repairs, clear codes and road test. Re-scan to confirm the fault is resolved and monitor for recurrence.
Likely causes
- Disconnected or corroded coil connector/wiring
- Bad ignition coil primary winding (open)
- Short to ground or to battery voltage in coil feed/return circuit
- Faulty PCM ignition driver (less common)
- Intermittent fault from damaged harness or moisture
Fault status
Status
Ignition Coil L primary control circuit indicates open or abnormal condition — PCM not seeing expected coil primary switching. Possible wiring, coil, or PCM driver fault.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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Code
P0362
GWM
P — Powertrain
- Malfunction in the primary / secondary circuit of the ignition coil L
Views:
UK: 1
EN: 2
RU: 3
AI status
Completed
Completed
100%
Causes
- Open or short in the ignition coil primary wiring (connector, harness, chafing)
- Corroded or loose coil connector or terminal
- Failed ignition coil (internal open primary winding or internal short)
- Faulty PCM/ignition driver transistor
- Poor battery or chassis ground at coil or PCM
- Water intrusion or contamination at coil/connector
Symptoms
- Check Engine Light (MIL) illuminated
- Misfire on the cylinder served by coil L, rough idle
- Reduced engine power, hesitation or stumbling
- Increased fuel consumption and emissions
- Possible difficulty starting or stalling
- Misfire-related vibrations under load or at idle
What to check
- Scan tool: confirm P0362 is current, review freeze frame and misfire counts
- Visually inspect coil L connector, wiring harness and nearby components for damage, corrosion or moisture
- Check for related DTCs (other coil circuits or misfire codes P030x)
- Verify battery voltage and engine grounds
- Backprobe coil connector to check for 12V supply and ground/driver signal
- Measure coil primary and secondary resistance with a multimeter
Signal parameters
- Nominal coil primary resistance (typical range): 0.3–3.0 ohms (varies by coil design)
- Nominal coil secondary resistance (typical range): 5 kΩ–20 kΩ (varies by coil design)
- Coil supply: battery voltage (~11–14.5 V with engine on) present at the power feed pin with key ON
- Control signal: PCM should switch the coil primary to ground (pulsed) during cranking/running — waveform: pulsed ground at dwell frequency
- Open-circuit condition: infinite ohms on primary or no pulsed signal from PCM
- Short-to-ground: near 0 ohms to ground on the power feed when PCM not commanding
Diagnostic algorithm
- Verify the code and note freeze-frame data with a scan tool. Clear codes and attempt to reproduce.
- Perform a visual inspection of coil L connector, pins and wiring for corrosion, bent pins, heat damage or water intrusion. Repair any obvious damage.
- Check vehicle battery voltage and engine/chassis grounds. Repair poor grounds or low battery condition.
- With ignition OFF, disconnect coil L and measure primary resistance across the coil primary terminals. Compare to manufacturer spec (if unknown, compare to other coils on engine). Replace coil if primary is open or out of spec.
- Check for power at the coil power feed terminal with key ON (should see battery voltage). If there is no power, trace and repair the feed circuit (fuse, relay, wiring).
- Backprobe the coil control/driver pin with ignition ON and cranking; observe with a multimeter or ideally an oscilloscope. Expect pulsed grounding by the PCM. If no pulses, suspect wiring or PCM driver.
- Check wiring continuity between coil connector and PCM pin; check for shorts to ground or to battery. Repair any breaks or shorts.
- Swap coil L with a known-good coil from another cylinder (if practical) and see if the code follows the coil. If code moves with coil, replace coil.
- If wiring and coil are good but no driver signal is present, test/replace PCM or inspect PCM grounds and connectors. Refer to manufacturer procedures before replacing PCM.
- After repairs, clear codes and road test. Re-scan to confirm the fault is resolved and monitor for recurrence.
Likely causes
- Disconnected or corroded coil connector/wiring
- Bad ignition coil primary winding (open)
- Short to ground or to battery voltage in coil feed/return circuit
- Faulty PCM ignition driver (less common)
- Intermittent fault from damaged harness or moisture
Fault status
Status
Ignition Coil L primary control circuit indicates open or abnormal condition — PCM not seeing expected coil primary switching. Possible wiring, coil, or PCM driver fault.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
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Code
P0362
HUMMER
P — Powertrain
Ignition Coil L Primary/Secondary Circuit Malfunction
Views:
UK: 4
EN: 11
RU: 7
AI status
Completed
Completed
100%
Causes
- Open or short in the ignition coil primary wiring (connector, harness, chafing)
- Corroded or loose coil connector or terminal
- Failed ignition coil (internal open primary winding or internal short)
- Faulty PCM/ignition driver transistor
- Poor battery or chassis ground at coil or PCM
- Water intrusion or contamination at coil/connector
Symptoms
- Check Engine Light (MIL) illuminated
- Misfire on the cylinder served by coil L, rough idle
- Reduced engine power, hesitation or stumbling
- Increased fuel consumption and emissions
- Possible difficulty starting or stalling
- Misfire-related vibrations under load or at idle
What to check
- Scan tool: confirm P0362 is current, review freeze frame and misfire counts
- Visually inspect coil L connector, wiring harness and nearby components for damage, corrosion or moisture
- Check for related DTCs (other coil circuits or misfire codes P030x)
- Verify battery voltage and engine grounds
- Backprobe coil connector to check for 12V supply and ground/driver signal
- Measure coil primary and secondary resistance with a multimeter
Signal parameters
- Nominal coil primary resistance (typical range): 0.3–3.0 ohms (varies by coil design)
- Nominal coil secondary resistance (typical range): 5 kΩ–20 kΩ (varies by coil design)
- Coil supply: battery voltage (~11–14.5 V with engine on) present at the power feed pin with key ON
- Control signal: PCM should switch the coil primary to ground (pulsed) during cranking/running — waveform: pulsed ground at dwell frequency
- Open-circuit condition: infinite ohms on primary or no pulsed signal from PCM
- Short-to-ground: near 0 ohms to ground on the power feed when PCM not commanding
Diagnostic algorithm
- Verify the code and note freeze-frame data with a scan tool. Clear codes and attempt to reproduce.
- Perform a visual inspection of coil L connector, pins and wiring for corrosion, bent pins, heat damage or water intrusion. Repair any obvious damage.
- Check vehicle battery voltage and engine/chassis grounds. Repair poor grounds or low battery condition.
- With ignition OFF, disconnect coil L and measure primary resistance across the coil primary terminals. Compare to manufacturer spec (if unknown, compare to other coils on engine). Replace coil if primary is open or out of spec.
- Check for power at the coil power feed terminal with key ON (should see battery voltage). If there is no power, trace and repair the feed circuit (fuse, relay, wiring).
- Backprobe the coil control/driver pin with ignition ON and cranking; observe with a multimeter or ideally an oscilloscope. Expect pulsed grounding by the PCM. If no pulses, suspect wiring or PCM driver.
- Check wiring continuity between coil connector and PCM pin; check for shorts to ground or to battery. Repair any breaks or shorts.
- Swap coil L with a known-good coil from another cylinder (if practical) and see if the code follows the coil. If code moves with coil, replace coil.
- If wiring and coil are good but no driver signal is present, test/replace PCM or inspect PCM grounds and connectors. Refer to manufacturer procedures before replacing PCM.
- After repairs, clear codes and road test. Re-scan to confirm the fault is resolved and monitor for recurrence.
Likely causes
- Disconnected or corroded coil connector/wiring
- Bad ignition coil primary winding (open)
- Short to ground or to battery voltage in coil feed/return circuit
- Faulty PCM ignition driver (less common)
- Intermittent fault from damaged harness or moisture
Fault status
Status
Ignition Coil L primary control circuit indicates open or abnormal condition — PCM not seeing expected coil primary switching. Possible wiring, coil, or PCM driver fault.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
Your experience will help others
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Was this AI description helpful?
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