Honda Civic: PGM-FI Main Relay Hot-Start Failure — Cranks but No Start When Hot
PGM-FI Main Relay Hot-Start Failure — Cranks but No Start When Hot is a common electrical fault on the Honda Civic on the 1995–2000 cars, and we rate it major. Putting it right costs $100 to $350 at New Zealand independent workshop rates. Below is what goes wrong, the symptoms to notice on a test drive, where to look, and what to ask the seller before you hand over any money. It is one of 39 documented faults on the Honda Civic.
- Vehicle
- Honda Civic
- Years
- 1995–2000
- Fuel
- petrol
- System
- Electrical
What you are looking at
No photograph available
What goes wrong
The fuel-injection main relay in these Civics fails with age: its solder joints crack, and when the cabin gets hot the joints open up and cut power to the fuel pump. The car cranks strongly but will not fire after sitting in the summer sun, then starts perfectly once it cools down — which makes the fault easy for a seller to hide at a cool morning viewing. It is one of the best-documented faults on 1990s Hondas, and the fix (a replaced or re-soldered relay) is cheap, but until it is done the car will keep stranding its owner on hot days.
What you would notice
- Cranks strongly but will not fire on a hot day or after parking in the sun
- No two-second fuel-pump whirr from behind the dash when the key is turned to ON
- Starts normally again once the cabin has cooled with the doors open
- Occasional sudden stall in hot traffic that clears after a cool-down
How to check it
Where to look. Relay up behind the dashboard on the driver's side, near the steering column
Ask to view the car after it has been sitting in the sun, and start it several times during the viewing — the fault is triggered by a hot cabin, not a hot engine.
Turn the key to ON (not start) and listen for the two-second whirr of the fuel pump priming behind the dash; silence on a warm day is the classic sign.
If the car has been pre-warmed and starts instantly every time, ask directly whether it has ever refused to start on a hot day.
Ask for the receipt if the seller says the relay was already replaced.
If a workshop inspection is possible: have the main relay's solder joints inspected or the relay swapped as cheap insurance — it lives up behind the dashboard on the driver's side.
What it costs to put right
$100 to $350 at New Zealand independent workshop rates. That is for this job on its own, not for the car.
Ask the seller
- “Has it ever refused to start on a hot day and then started later once it cooled?”
- “Has the main relay ever been re-soldered or replaced?”
Now check the Honda Civic you are actually looking at
Everything above is true of the model, and it is free. What it does not tell you is whether THIS car has been looked after: its odometer history and whether the reading has ever gone backwards, whether there is still money owing on it, whether it has been reported stolen, how many owners it has had and what it is really worth today. That comes from the official records for that plate. Enter the plate for the free details, or get the full history and a market valuation from $13.49.
Where this comes from
- Eric The Car Guy 'Solving Honda No-Start Problems' main relay diagnosis video
- Honda-Tech PGM-FI main relay hot no-start threads
Honda Civic buyer questions
Is pgm-fi main relay hot-start failure — cranks but no start when hot serious on a Honda Civic?
We rate it major and common on the Honda Civic. The fuel-injection main relay in these Civics fails with age: its solder joints crack, and when the cabin gets hot the joints open up and cut power to the fuel pump. The car cranks strongly but will not fire after sitting in the summer sun, then starts perfectly once it cools down — which makes the fault easy for a seller to hide at a cool morning viewing. It is one of the best-documented faults on 1990s Hondas, and the fix (a replaced or re-soldered relay) is cheap, but until it is done the car will keep stranding its owner on hot days.
How much does it cost to fix on a Honda Civic?
$100 to $350 at New Zealand independent workshop rates. That figure is for this job on its own. A car showing the symptoms on this page is usually worth either walking away from or negotiating down by at least the repair figure.
Which Honda Civic years are affected?
Our research records this fault on the 1995–2000 Honda Civic. Build dates move around, especially on imported cars, so treat the range as the years to look hardest at rather than a guarantee either way. The official records tell you the exact build and first registration date for the car in front of you.
How do I check for it before I buy?
Ask to view the car after it has been sitting in the sun, and start it several times during the viewing — the fault is triggered by a hot cabin, not a hot engine. Turn the key to ON (not start) and listen for the two-second whirr of the fuel pump priming behind the dash; silence on a warm day is the classic sign. If the car has been pre-warmed and starts instantly every time, ask directly whether it has ever refused to start on a hot day. Ask for the receipt if the seller says the relay was already replaced. If a workshop inspection is possible: have the main relay's solder joints inspected or the relay swapped as cheap insurance — it lives up behind the dashboard on the driver's side. Look here: Relay up behind the dashboard on the driver's side, near the steering column