Took 05 Prius in yesterday of 120K mile check up. Today was driving and began to lose power. VSC light, ck engine light, battery Main light came on; triangle with exclamation point came on; would not accelerate. Pulled to side turned off, waited a minute and restarted. Ck engine light stayed on, and then red triangle with exclamation point came back on as did the VSC light. Got it to the dealer and they ran diagnostics. These codes came up: B2799, B1421, B1471, B1200, B1207, P3000, P2103, POA82 and C2318. They said they would have to do additional diagnostics to pinpoint what was wrong. They said it could just be a "glitch," and they could clear the codes and I could drive it to see if it happened again. I'm going to drive it tomorrow, but does anyone know what might be going on. Was supposed to take a trip this weekend, but am worried that I might get stranded in the middle of nowhere.
I do not think you should take a road trip with the car in this condition. 1. DTC C2318 is interesting because the transmission control ECU is reporting low voltage on the 12V bus. If your 12V battery is original equipment, it would be a great idea to replace that first. 2. DTC P0A82 means that the traction battery temperature is greater than it should be. Maybe you have a clogged air inlet (near the right-side rear door) or maybe the battery fan is not working. 3. The other interesting code is DTC P2103 which means the throttle control motor is drawing excessive current. Maybe the throttle needs to be cleaned or maybe the motor needs to be replaced. I think you should at minimum address #1 and #2 and have the throttle body interior and throttle plate cleaned. Then clear the codes and see if you still have a problem with the throttle control motor. If so, then you'll need to figure out why it is drawing excessive current, which may require motor replacement.
Thank you so much. I'll check into each of those. The tech also said one side of the battery was hotter than the other. Not sure if that adds any pertinent info.
I am assuming that you are talking about one side of the traction battery being hotter than the other; and given that info it is clear that the traction battery cooling is impaired. That definitely should be fixed before you go on your road trip. Good luck.
Once again, thank you for taking the time to address my problem. When I take the car back, I will be able to speak with some sense! You're very kind. I'll post when I get a result!
B2799 = Engine Immobiliser System Malfunction B1421 = Solar Sensor Circuit B1471 = A/C Inverter High Voltage Power Resource System Malfunction B1200 = MPX Body ECU Stop B1207 = Smart ECU Stop P3000 = Battery ECU reporting error P2103 = Throttle Actuator Control Motor Circuit High P0A82 = Hybrid Battery Pack Cooling Fan 1 Performance or Stuck OFF C2318 = Low Voltage Error (Power Supply Malfunction) Bit of a rag-bag. B1421 can occur if an active check for problems is carried out in a relatively dark place, and may be a false reading. Loss of power is probably due to P2103, whose fail-safe operation is to fix the throttle opening angle at not-quite-closed and the engine's speed is controlled by cutting the fuel. It's recorded when very high current is drawn by the throttle motor - more than 10 amps. Very high current draw could pull down the 12V system bus voltage. I'd check the throttle motor for a short circuit, then see if the other problems still occur. The hot battery could simply be due to the amount of electric-only driving, and the cooling fan not running effectively due to weak 12V system voltage (though very weak system voltage should trigger P0A84). Or, you could have had a latent problem with battery cooling all along, but you don't normally stress the electrical system in your driving so the fan wasn't needed until now.
Thank you very much for your input. The car drove fine today with but couldn't get in to get it worked on. I am leary of taking it on an extended trip without having some of these things checked, so it looks like I'll be spending money on diesel for the F250! I guess better safe than sorry. Thank you again for taking the time to address my problems. I so appreciate the experience you're willing to share.
