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 the car's computer has noticed that the spark plug in cylinder 8 is not sparking for long enough. It's like if a sparkler went out too quickly.
The engine control module (ECM) monitors the duration of the spark in each cylinder. If the spark duration for cylinder 8 is shorter than expected, this code is triggered.
P1308 indicates that the ignition spark duration for cylinder 8 is shorter than the expected time frame. This can affect the engine's performance and efficiency, as the spark is crucial for igniting the air-fuel mixture in the cylinder.
• Engine misfire
• Rough idling
• Reduced fuel efficiency
• Faulty spark plug
• Defective ignition coil
• Wiring issues in the ignition system
ECM: Engine Control Module
Ignition Coil: A component that transforms the battery's voltage to a higher voltage to create a spark.
• Check the spark plug in cylinder 8 for wear or damage.
• Inspect the ignition coil for cylinder 8.
• Examine the wiring and connections related to the ignition system.
• Replace the spark plug in cylinder 8.
• Replace the ignition coil for cylinder 8.
• Repair or replace damaged wiring.
• Spark plug socket
• Multimeter
• Diagnostic scanner
$100 - $300
Moderate
• Ford F-150
• Chevrolet Silverado
• Dodge Ram
• Regularly replace spark plugs as per maintenance schedule.
• Inspect ignition system components periodically.
• Ensure good quality fuel is used.
Engine Performance
• Do not ignore this issue as it can lead to further engine damage.
• Consult with a professional mechanic if unsure about the repair.
Check with the vehicle manufacturer for warranty coverage on ignition system components.
This code has been reported in vehicles with high mileage or those that have not had regular ignition system maintenance.
Moderate – Addressing this issue promptly can prevent further engine damage.
Driving with a misfiring engine can lead to increased emissions and may not comply with local environmental regulations.
• Engine at operating temperature
• Vehicle at idle
Cylinder 8 is typically located at the rear of the engine on the passenger side in V8 engines.
Q: Can I drive with a P1308 code?
A: It's not recommended to drive for long with this code, as it can lead to engine damage.
Q: How can I prevent this code from appearing?
A: Regular maintenance of the ignition system, including timely replacement of spark plugs and ignition coils, can help prevent this issue.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
View on Amazon
Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
View on Amazon
Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.
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.
View options on Amazon
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.