Push Button Start Works Sometimes: How to Diagnose Intermittent No-Start Problems

People searching for push button start works sometimes: how to diagnose intermittent no-start problems are usually not looking for a generic product description. They want to know whether the upgrade will work on their specific older car or truck, what can go wrong, and how to avoid turning a convenience upgrade into an electrical troubleshooting project.

This EFHIPS guide focuses on that exact search intent. The goal is to help you identify the vehicle-side requirements first, then decide whether push button start, PKE, keyless entry or remote start actually solves the problem you have.

Record the Exact Failure

Separate dead controller, dash-on/no-crank, crank-no-start and starts-then-dies symptoms. Intermittent problems become easier when each failure is classified.

Measure Voltage During the Failure

A poor ground or high-resistance power connection may appear normal with no load. Measure at the controller while the failure is happening, not later when the car works again.

Inspect Movement and Vibration

Loose connectors and unsupported splices can react to steering-column movement, temperature and vibration. Gently inspect harness routing without creating new faults.

Brake Input Can Be Intermittent

A marginal brake-switch connection can make the start button appear unreliable. Confirm the input directly at the module during both successful and failed attempts.

Watch Security Indicators

If the failed start coincides with unusual security-light behavior, investigate immobilizer authorization before replacing relays.

Keep a Failure Log

Record outside temperature, battery voltage, hot/cold engine, dashboard behavior, security light, lock/unlock behavior and whether remote start worked. Patterns often appear quickly.

Final Thoughts

Intermittent electrical problems become easier when each failure is treated as data. Capture the system state at the moment it fails and compare it with a successful start.

Before You Change Any Wiring

Confirm the vehicle starts reliably in factory configuration.
Use a digital multimeter to verify critical circuits on the actual vehicle.
Identify the factory immobilizer or anti-theft system.
Document any old alarms, remote starters or repaired wiring already under the dash.
Keep new wiring away from pedals, steering components, airbags, sharp brackets and heat.

Safety: Vehicle wiring differs by year, trim, engine and market. Do not treat an online color chart as proof. If you cannot confidently identify the circuit and its behavior, use a qualified automotive electrical installer.