Code
P1362
CADILLAC
P — Powertrain
IC Cylinder 2 Not Toggling After Enable
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring to the cylinder 2 coil or injector driver
- Poor connector pin contact, corrosion, or pushed-out terminal at coil/injector or PCM harness
- Failed ignition coil or failed fuel injector on cylinder 2
- Faulty driver inside the PCM or intermittent PCM connection/ground
- Cylinder deactivation (active fuel management) solenoid/valve or oil control valve stuck or not responding (if equipped)
- Low battery/low system voltage or blown fuse/relay feeding the driver circuit
Symptoms
- Check Engine Light (MIL) illuminated
- Possible rough idle or misfire, often localized to cylinder 2 (may set P0302 as well)
- Loss of power or reduced drivability under load
- Possible intermittent starts or stalling in severe cases
What to check
- Read and record all stored codes and freeze frame data with a scan tool; note related codes (P0302, P0352, P0202, manufacturer-specific codes)
- Verify battery voltage with engine cranking and at idle (should be near battery voltage, typically >12V)
- Visually inspect connectors and wiring at cylinder 2 coil/injector, PCM and related grounds for damage, corrosion, or pushed-out terminals
- Confirm whether the vehicle is equipped with cylinder deactivation / AFM and inspect its solenoid/OY control valve if present
- Use a scan tool to command the coil/injector driver (attempt to actuate) and monitor response/feedback in live data
- If available, capture primary ignition waveform or injector drive signal with an oscilloscope while commanding the output
Signal parameters
- Command signal: PCM toggles driver between near 0 V and battery voltage; should show pulsed switching when commanded
- Coil primary typical behavior: switching waveform on primary circuit when fired (exact amplitude and shape vehicle-specific)
- Injector drive typical: pulse to ground or to battery (vehicle-specific); pulse width corresponds to fuel command
- Resistance references (vehicle-specific): injector high-impedance ~12–16 Ω or low-impedance ~2–5 Ω; coil primary low-ohm values often
Diagnostic algorithm
- Retrieve all codes and freeze frame data. Note vehicle history and related DTCs. Clear codes and attempt to reproduce under the same conditions.
- Verify battery/charging system health (voltage and cranking). Low voltage can cause driver non-response.
- Perform visual inspection of the cylinder 2 coil/injector connector, wiring harness, and PCM connector. Repair any damaged wiring or corroded terminals.
- With ignition ON (engine off) and appropriate safety precautions, backprobe the cylinder 2 driver connector. Command the driver from a scan tool while observing voltage. If no command present, suspect PCM or wiring upstream.
- If command is present but the component does not respond, check component continuity and resistance against service values. Swap the coil/injector with a known good cylinder to see if the fault follows the component.
- If component follows, replace the faulty coil or injector. If component does not follow and no command is present, trace wiring continuity from the component to the PCM and check grounds and related fuses/relays.
- Use an oscilloscope to capture the primary ignition waveform or injector drive when commanded to confirm proper switching and timing. Compare to known-good waveforms or specifications.
- If wiring and the component check OK but no driver command is present and harness is good, consider PCM driver failure or software/corruption—verify software level and perform PCM reflash/update per service information before replacing the PCM.
- After repairs, clear codes and road test to verify the fault does not return. Re-scan for stored or pending codes.
Likely causes
- Wiring connector corrosion or loose terminal at cylinder 2 coil/injector
- Failed ignition coil on cylinder 2
- Faulty cylinder deactivation solenoid or oil control valve (if vehicle has cylinder deactivation)
- Damaged/shorted harness between PCM and cylinder 2 driver
- PCM driver failure (less common)
Fault status
Status
PCM commanded cylinder 2 control but no toggle/response detected. Fault set and MIL illuminated.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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