Code
P1358
DS
P — Powertrain
Ignition coil 1 short circuit to positive
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AI status
Completed
Completed
100%
Causes
- Damaged ignition coil (internal short)
- Shorted wiring or damaged insulation between coil control/driver and battery positive
- Corroded or pushed-out connector pin causing unintended contact with B+
- Poor crimp or after-market repair that ties control conductor to B+
- Blown ignition driver within the ECU (low impedance to B+)
- Faulty power supply fuse/relay or incorrect wiring after recent repairs or engine swaps
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Misfire on cylinder 1 (rough idle, engine vibration)
- Loss of power or poor acceleration
- Difficulty starting or no-start condition
- Possible increased fuel consumption and exhaust smell of unburnt fuel
What to check
- Read stored freeze frame and pending codes; note any related misfire codes (e.g., P0301)
- Visual inspection of coil 1, connector and harness for heat damage, melted insulation, exposed conductors or corrosion
- Check for any service bulletins or recent wiring/engine work
- Verify fuses and relays for ignition/coil supply circuits
- With ignition ON (engine off) measure voltage at coil supply terminal (should be near battery voltage)
- Check continuity and resistance between coil control terminal and battery positive to confirm short
Signal parameters
- Coil supply (B+): ~12 V with ignition ON
- ECU control signal: ground-side switching/pulsed; should not be permanently at B+
- Typical coil primary resistance (varies by design) commonly ~0.3–2 Ω — consult vehicle spec
- Secondary resistance: commonly thousands of ohms (check factory spec)
- Dwell/pulse width varies with RPM/load — control signal should be pulsed by ECU, not continuous B+
Diagnostic algorithm
- Retrieve codes and freeze-frame data. Note related misfire codes or history. 2) Visually inspect coil 1, connector and harness for melted insulation, pin damage, corrosion or signs of water ingress. 3) With ignition OFF, disconnect coil 1 connector and inspect pins for contamination or a pin pushed into contact with the B+ terminal. 4) Check fuses/relays for coil power. With key ON (engine off) measure battery voltage at the coil supply terminal; confirm ignition supply is present only where expected. 5) Measure resistance between the coil control terminal and battery positive. A low or near-zero reading indicates a short to B+. 6) Measure coil primary and secondary resistances and compare to manufacturer specifications. 7) Swap coil 1 with a known-good coil from another cylinder (if compatible). Clear codes and run; if code follows the coil, replace the coil. 8) If code remains on cylinder 1 after swapping, trace wiring from coil connector back to the ECU looking for chafing, pin contact, or incorrect splices; repair any damaged wiring/connector. 9) If wiring and connector check good, verify ECU driver output with an oscilloscope or appropriate test tool. If ECU output is faulty or shorted to B+, consider ECU repair/replacement only after ruling out harness/connectors/coils. 10) After repair, clear codes and road-test to confirm fault does not return.
Likely causes
- Failed coil pack on cylinder 1 with internal primary short to B+
- Damaged harness/insulation at coil connector (pin contact with B+ terminal)
- Incorrectly routed or pinched wiring that contacts a 12V source
- Connector corrosion or water ingress bridging terminals
Fault status
Status
P1358 - Ignition coil 1 short circuit to positive (B+) detected. Check coil 1 and wiring/connector for short to battery.
Repair difficulty: Medium
Diagnostic time: 1.0-2.0 hours
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