2018 Honda Clarity Plug-in Hybrid engine problems

“I will first start with our problems/concerns. We had experienced a complete lost power in freeway speed (65 mph) when the battery is depleted, that is when the battery bar goes to zero bar instead of 2 bars usually. I attached a photo from the video I took for your reference. This experience was the engine ramp up and not getting any power while driving on freeway, escpecially obvious during uphill slope. It is a safety hazard where we had to manuver in order avoid traffic since we could not maintain freeway speed. This originally happened around 2022, but we checked with Norm Reeves Honda Cerritos and they told us nothing is wrong and because there was no fault code, nothing they can do. When the Recall service canoaign 24-031 came, we were relieved because we think the problem is going to be fixed. We brought our Honda Clarity to the dealer on 2/3/2025 for the recall and everything was fine (meaning we can drive on HV after our battery is depleted). But around December 2025, my wife experienced the same situation where she couldn’t keep up with the freeway speed after exhausted the electric range of 34 miles. We took it to dealer again on 1/16/2026 and…”

“Since fuel pump recall fix by dealership, “Emission System Problem” started appearing in my car due to the way fuel pump recall was fixed. They already attempted to fix the issue 5 times but unable to provide permanent fix. Honda corporate office also not willing to help. This is a safety issue as when I drive the car, I smell gas and my car is constantly with dealership without permanent fix.”

“Hello, I have received a safety recall notice (23V-858) from Honda back in February and another one in July. I have tried to get them to repair it a few times, but they said they do not have the part yet but should have it sometime in the fall. They are telling me that they are only fixing cars with issues at the moment, which I cannot with 100% certainty say my car has the issue they are talking about. The CSR told me that I would have to pay for diagnostics if they found my car not having the issue in question, which of course I do not want to do. My question is, does Honda not have the duty to fix my car in a timely manner if they have issued a recall for it? I have been waiting for at least 7 months now? That is way too long? Thank you for your attention in this matter [XXX]”

“WHILE I WAS CHECKING THE ENGINE OIL LEVEL, I SMELLED A STRONG GASOLINE ODOR. SINCE THIS PARTICULAR ENGINE HAS A KNOWN OIL DILUTION PROBLEM I HAD OIL ANALYSIS DONE AND THE RESULTS CAME BACK INDICATING THAT THERE IS A SIGNIFICANT LEVEL OF FUEL IN THE OIL WHICH CAN DAMAGE THE INTERNAL COMPONENTS OF THE ENGINE AND EVENTUALLY RESULT IN AN ENGINE FAILURE. I CALLED HONDA CORPORATE OFFICE TO REGISTER THE ISSUE AND ON FEB 24TH, I HAD MY OIL SAMPLED. I RECEIVED THE RESULTS ON MARCH 3RD AND IMMEDIATELY CALLED HONDA THE SAME DAY TO SHARE THE ANALYSIS. I HAVE NOT RECEIVED ANY RECOURSE AS OF YET AND PENDING A RESPONSE.”

“FEW TIMES IT HAS HAPPENED ESPECIALLY IN EXTREME COLD WEATHER, THERE WILL BE LOSS OF POWER/ACCELERATION EVEN THOUGH YOU ARE TRYING TO ACCELERATE THE VEHICLE. WHILE ACCELERATING IT WILL TAKE THE COMMAND ENGINE RPM WILL BE HIGHER BUT VEHICLE IS NOT TAKING UP THE SPEED. EITHER IT WILL STAY TO GO AT LOW SPEED OR SLOWLY IT WILL STARTING TO HALT SITUATION. THIS HAS HAPPENED FEW TIMES(ABOUT 5-6 TIMES). AND IN SUCH SITUATION THERE WILL SOME UNACCEPTABLE NOISE FROM ENGINE. ONE TIME WE WERE AT ABOUT 50MPH SPEED BUT I COULDN'T ACCELERATE (JUST LIKE ABOVE) AND HAD TO STOP THE CAR IN MIDDLE OF HIGHWAY, STOP THE CAR (SHUT THE ENGINE) AND THEN START THE CAR IT STARTED WORKING FINE. THIS HAPPENED MOSTLY WHEN ON GAS AND ESPECIALLY DURING EXTREME COLD WEATHER. WHILE ON FULLY EV MODE IT WORKS FINE, I HAVE NEVER EXPERIENCED THIS PROBLEM.”

“WHILE DRIVING ON THE INTERSTATE THROUGH THE MOUNTAINS, THE CAR WAS ABLE TO KEEP UP WITH TRAFFIC AT THE BOTTOM OF THE MOUNTAIN. HOWEVER, AS I APPROACHED THE SUMMIT, NO MATTER HOW FAR DOWN I PUSHED THE ACCELERATOR PEDAL, THE CAR WOULD NOT INCREASE SPEED. WITH THE PEDAL COMPLETELY FLOORED (PAST THE HYBRID SYSTEM CLICK POINT) THE CAR WOULD STILL NOT PICKUP SPEED, NOR DID IT SOUND LIKE THE ENGINE WAS EVEN TRYING TO REV HIGHER. AS I KEPT APPROACHING THE SUMMIT WITH THE PEDAL FLOORED, THE CAR STARTED TO SLOWLY LOSE SPEED. AS A RESULT, I WAS NOT ABLE TO KEEP WITH TRAFFIC AND HAD TO MOVE TO THE FAR RIGHT LANE. DURING THIS EXPERIENCE, THE CAR WAS OPERATING IN HYBRID MODE WITH ABOUT 10% BATTERY CHARGE SAVED. MY PREVIOUS PHEV NEVER EXPERIENCED THIS TYPE OF BEHAVIOR EVEN THOUGH IT HAD LESS SYSTEM HORSEPOWER AND TORQUE. TO EXPERIENCE THIS WAS DISAPPOINTING. NOT KNOWING IF THE CAR WILL ACTUALLY ACCELERATE WHEN I NEED TO IS HIGHLY DISCONCERTING.”