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- Toyota Corolla 2021 hybrid 1.8
Hello friends,
My car is a 2021 Corolla 1.8 Hybrid with 550,000 km, a heavily used vehicle.
For the past 1.5 months, it has had an unresolved/undetected fault. While driving, the hybrid system shuts down and puts itself into protection mode, then stalls. My tester shows error code P3190 – Low Engine Power. There are no other fault codes, just this one.
There could be many possible causes for this, and we’ve tried them all. First, at my own private Toyota service, we checked every possibility but couldn’t find the issue. Then I took it to the authorized service center, where the following were replaced/checked:
1. HV Battery replaced
2. HV Battery cooling fan replaced
3. HV Battery sensor replaced
4. Fuel pump and filter replaced
5. ECU (engine control unit) replaced
6. EGR and all connected intake manifolds and hoses inspected
7. MAF sensor, air flow, fuel pressure sensors, etc., tested and cleaned
Despite all this, the fault couldn’t be found. Since the costs kept increasing and they couldn’t locate the issue after 2 weeks, I took the car back from the service center.
Later, we noticed on the tester that the ECU was reading the auxiliary (12V) battery voltage as 9V. However, when checked with a voltmeter, the auxiliary battery and the vehicle’s components all showed 12V. At the battery output, on the parts, fuse box, and even the ECU itself, we measured 12V, but the ECU reads 9V.
Because of this, we suspected the inverter and replaced it as well. The car ran smoothly for 100 km but then the fault reappeared. Currently, the wiring and harnesses are being inspected one by one for leaks, cuts, or corrosion.
There’s clearly a faulty condition we are missing, but we just can’t find it.
Sorry for the long explanation, I tried to keep it as short as possible.
If anyone has experienced something similar or has any ideas, I’d appreciate your help.
Thank you.
My car is a 2021 Corolla 1.8 Hybrid with 550,000 km, a heavily used vehicle.
For the past 1.5 months, it has had an unresolved/undetected fault. While driving, the hybrid system shuts down and puts itself into protection mode, then stalls. My tester shows error code P3190 – Low Engine Power. There are no other fault codes, just this one.
There could be many possible causes for this, and we’ve tried them all. First, at my own private Toyota service, we checked every possibility but couldn’t find the issue. Then I took it to the authorized service center, where the following were replaced/checked:
1. HV Battery replaced
2. HV Battery cooling fan replaced
3. HV Battery sensor replaced
4. Fuel pump and filter replaced
5. ECU (engine control unit) replaced
6. EGR and all connected intake manifolds and hoses inspected
7. MAF sensor, air flow, fuel pressure sensors, etc., tested and cleaned
Despite all this, the fault couldn’t be found. Since the costs kept increasing and they couldn’t locate the issue after 2 weeks, I took the car back from the service center.
Later, we noticed on the tester that the ECU was reading the auxiliary (12V) battery voltage as 9V. However, when checked with a voltmeter, the auxiliary battery and the vehicle’s components all showed 12V. At the battery output, on the parts, fuse box, and even the ECU itself, we measured 12V, but the ECU reads 9V.
Because of this, we suspected the inverter and replaced it as well. The car ran smoothly for 100 km but then the fault reappeared. Currently, the wiring and harnesses are being inspected one by one for leaks, cuts, or corrosion.
There’s clearly a faulty condition we are missing, but we just can’t find it.
Sorry for the long explanation, I tried to keep it as short as possible.
If anyone has experienced something similar or has any ideas, I’d appreciate your help.
Thank you.