P1359
FordSpark Output Circuit Malfunction
The engine computer has detected a fault involving the circuit used to control or manage spark generation. Depending on the vehicle and the fault, ignition timing or spark operation may be affected. This code identifies a detected condition; it does not by itself prove that a particular component has failed.
⚠️ Before You Begin (Safety First)
If the engine runs severely rough, loses power, stalls, or the check-engine light flashes, stop driving when it is safe to do so and arrange diagnosis. Continued driving with a severe misfire can cause further damage. If the engine runs normally, have the fault checked soon and avoid demanding driving until it is diagnosed.
Common Symptoms
- The check-engine light may be on, though the vehicle may have no noticeable symptoms.
- Rough running or misfiring may occur if spark operation is disrupted.
- Starting may be difficult or the engine may fail to start if spark control is significantly affected.
- Reduced power, hesitation, or stalling may occur if ignition operation is impaired.
Common Causes
- Damaged, loose, corroded, or poorly connected wiring or connectors in the spark output circuit.
- A fault in an ignition component or control circuit connected to spark output.
- An engine-control problem affecting the circuit's operation.
- An intermittent electrical connection or wiring fault that appears only under certain conditions.
Diagnostic Steps
- Record all diagnostic codes and note any symptoms before clearing codes; related codes can help narrow the diagnosis.
- With the engine off and cool, visually inspect accessible spark-output-circuit wiring and connectors for damage, looseness, corrosion, or signs of rubbing.
- Check whether the issue began after recent electrical or engine work, and confirm that any disturbed connectors are fully seated.
- If the fault returns or the wiring is not visibly damaged, stop replacing parts by guesswork and arrange circuit testing using service information for the exact vehicle.
When to Call a Professional
Check for related codes and review available scan data before replacing parts. Inspect the spark output circuit and its connectors, then use vehicle-specific service information to test circuit continuity and operation. Signal testing may be needed to distinguish a wiring fault from an ignition-control or engine-control problem.
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Commonly Asked Questions
Does P1359 prove that an ignition component needs replacement?
No. It reports a detected spark output circuit malfunction. Wiring, connectors, ignition components, or an engine-control issue may be involved; testing is needed to identify the cause.
Can the vehicle have this code without obvious symptoms?
Yes. A fault can be detected even when the vehicle seems to run normally, particularly if the problem is intermittent.
Is it safe to keep driving?
That depends on how the engine runs. Stop driving if it misfires severely, stalls, loses substantial power, or the check-engine light flashes. If it runs normally, arrange diagnosis soon and avoid hard driving.
Could damaged wiring cause P1359?
Yes. A damaged or poorly connected circuit can interfere with spark output control. Visual inspection is useful, but electrical testing may be required to confirm the fault.
Are the test steps the same for every Ford?
No. Applicability, circuit layout, and test procedures depend on the vehicle's model, year, and engine. Use service information specific to the vehicle.
Browse Available Code Guides
Previous and next available guides in database record order, across makes. Adjacent entries may share a code number and do not necessarily describe related faults.