Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that when you start the car in the cold, it doesn't have enough power saved up to run smoothly.
The code indicates that during a cold start, the engine control module (ECM) detected that the integrated moment reserve, which helps the engine start smoothly, was not sufficient.
P1559 is triggered when the ECM determines that the calculated integrated moment reserve during a cold start is below the threshold necessary for optimal engine performance. This reserve is crucial for ensuring the engine runs smoothly immediately after starting, especially in cold conditions.
• Rough idle during cold start
• Engine stalling shortly after starting
• Check Engine Light illuminated
• Faulty engine control module (ECM)
• Issues with the fuel system
• Problems with the ignition system
ECM: Engine Control Module, the computer that controls engine functions.
Cold Start: Starting the engine when it is cold, typically after being off for several hours.
• Check for any other related codes.
• Inspect the fuel and ignition systems for faults.
• Test the ECM for proper operation.
• Repair or replace faulty ECM.
• Fix issues in the fuel system such as clogged injectors.
• Address any ignition system problems, like faulty spark plugs.
• OBD-II scanner
• Multimeter
• Fuel pressure gauge
$200 - $800
Moderate
• Volkswagen Passat
• Audi A4
• BMW 3 Series
• Regular maintenance of fuel and ignition systems.
• Ensure timely software updates for ECM.
• Use high-quality fuel.
Engine Performance
• Avoid driving the vehicle until the issue is resolved to prevent further damage.
• Consult with a professional mechanic for a thorough diagnosis.
Check with your vehicle manufacturer; ECM issues may be covered under powertrain warranty.
This code is more common in colder climates where cold start conditions are frequent.
Moderate – Addressing this issue promptly can prevent further engine performance problems.
Ignoring this code may lead to increased emissions and potential safety hazards due to engine stalling.
• Vehicle should be cold (not run for several hours).
• Ambient temperature should be low.
The ECM is typically located in the engine bay or under the dashboard.
Q: Can I drive with a P1559 code?
A: It's not recommended as it may lead to further engine issues and poor performance.
Q: What does 'integrated moment reserve' mean?
A: It refers to the engine's ability to maintain smooth operation during a cold start by having enough power reserve.
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Fitment Required · Vehicle-fitment part
Commonly relevant for misfire, ignition-efficiency, and some drivability-related repairs.
Misfire and ignition-related faults commonly involve spark plugs as part of the repair path.
Check the correct plug type, gap, and engine application for your vehicle.
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Fitment Required · Vehicle-fitment part
Relevant when the fault points toward ignition-coil performance or cylinder-specific ignition issues.
Some ignition faults involve coil performance or cylinder-specific coil problems.
Match the coil to your engine and confirm the failed component before ordering.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.