Code
P1359
CITROEN
P — Powertrain
Ignition coil 3 control short circuit to positive
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AI status
Completed
Completed
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Causes
- Damaged or chafed wiring harness allowing the control wire to contact a battery positive feed or other fused 12 V circuit
- Corroded, pushed‑out or damaged coil connector making unintended contact with positive voltage
- Failed ignition coil with internal short to battery positive
- Incorrect previous repair or aftermarket wiring tapped into the coil control circuit
- Blown or miswired fuse/relay that routes battery positive to the wrong pin
- ECM/PCM driver transistor or internal circuitry fault creating a positive feed on the driver output
Symptoms
- Check Engine Light (MIL) illuminated
- Misfire on cylinder 3 (rough idle, vibration)
- Loss of power, hesitation or stumbling under load
- Possible reduced fuel economy
- Engine may not start if coil driver circuit is stuck or ECM disables injector
What to check
- Read and record freeze frame data and live PIDs. Note engine conditions when code set.
- Visually inspect coil #3, connector and wiring for heat damage, corrosion, melted insulation, pin damage or foreign wires contacting the connector.
- Check for related codes (misfire, injector, ECM) and freeze frame data for cylinder 3.
- Backprobe coil #3 control pin with a digital multimeter (DMM) and/or oscilloscope while cranking and running to observe voltage and switching behavior.
- Measure continuity between the control pin and battery positive with ignition OFF to detect short; measure resistance to ground/ECM as appropriate.
- Swap coil #3 with another known good coil (if coils are identical and plug‑and‑play) to see if code follows the coil.
Signal parameters
- Expected: Coil control typically is a low‑side (ground) switched output from the ECU. When not firing the driver may be near battery voltage; when firing it is pulled to near 0 V (pulsed).
- Expected dynamic: pulsed switching at ignition timing frequency (0 V pulses) — amplitude swing ~0–12 V depending on design.
- Faulty condition: constant ~12 V on the control pin, no switching pulses, or voltage spikes/overvoltage present.
- Primary coil resistance and waveform values vary by model — consult vehicle service manual for exact coil primary resistance and oscilloscope patterns.
Diagnostic algorithm
- Retrieve codes and freeze frame. Note conditions (RPM, load, temp) when P1359 set.
- Visually inspect coil #3, connector, and wiring harness for damage, melted insulation, corrosion, pin pushing or foreign wiring contacting +12 V circuits.
- With ignition ON (engine OFF), measure voltage at the coil #3 connector power pin and control pin. Expect battery voltage at power supply pin; control pin should not be a permanent solid 12 V when ECM is commanding—verify service manual expected behavior.
- Start engine or crank while backprobing the control pin. Use an oscilloscope if available: look for switching pulses (0 V pulses) when firing. If the control pin remains at ~12 V with no pulses, suspect a short to positive or driver fault.
- Disconnect coil #3 connector and measure resistance/continuity between the control pin and battery positive to confirm a short path. Also check continuity to other circuits that might be imparting 12 V.
- Swap ignition coil #3 with another cylinder’s coil (if coils are identical) and clear codes. If the code moves to the other cylinder, the coil is likely faulty. If the code stays on cylinder 3, the issue is wiring or ECM.
- If wiring damage is found, repair broken insulation, replace damaged connector pins, and protect harness routing away from heat sources and moving parts.
- If wiring and coil test good but control pin still tied to 12 V, follow factory ECM/PCM testing procedures — test or replace ECM only after all wiring and coil possibilities are exhausted.
- After repairs, clear codes and road test. Verify code does not return and misfire condition is resolved.
Likely causes
- Wiring or connector damage at coil #3 (most common)
- Ignition coil #3 internal fault
- Short to 12 V caused by nearby damaged harness or accessory wiring
- Faulty ECM driver (less common, after wiring/coils checked)
Fault status
Status
ECU reports ignition coil 3 control circuit shorted to positive (P1359). The coil control line is seeing battery voltage or overvoltage instead of the expected switching signal.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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