Come discuss the technical ins and outs of the 2010, 2011, 2012, 2013, 2014, & 2015 3rd Generation Toyota Prius and the Hybrid Synergy Drive System. Thu, 11 Jun 2026 03:20:15 +0000 Thu, 11 Jun 2026 03:20:15 +0000 PriusChat https://priuschat.com/forum/gen-3-prius-technical-discussion.94/ Wed, 10 Jun 2026 14:37:55 +0000 https://priuschat.com/threads/cq3-charging-tips-problems-and-question.248807/ https://priuschat.com/threads/cq3-charging-tips-problems-and-question.248807/ invalid@example.com (Seymour1) Seymour1
I took my old bus bars and soldered the charger wires onto them and attached each bus bar to the screw studs on the modules. And, I soldered the swivel...

CQ3 charging tips, problems and question]]> 6 Tue, 09 Jun 2026 05:29:36 +0000 https://priuschat.com/threads/fuel-pump-issues.260275/ https://priuschat.com/threads/fuel-pump-issues.260275/ invalid@example.com (PaulMarshall) PaulMarshall
It never went above 2 pips after complete fill up.

40 or 50 miles later 1 pip.

Then another 40 or 50 miles 1 pips starts flashing....

Wife's in the 2021 prius following me and I'm on the phone with her saying "well this could be interesting when car finally thinks it out of gas".

Made...

Fuel pump issues]]> 5 Mon, 08 Jun 2026 06:48:14 +0000 https://priuschat.com/threads/libsu-redesigning-the-battery-support-unit-to-support-lithium.249158/ https://priuschat.com/threads/libsu-redesigning-the-battery-support-unit-to-support-lithium.249158/ invalid@example.com (mudder) mudder 1: I apologize in advance for any incorrect vernacular specific to the Prius. I'm a (passionate) G1 Honda Insight owner, who prior to today had never been inside a Gen3 Prius. Prior to last night I'd never even studied the wiring diagram... so I'm bound to get some terms wrong.

2: I designed and sell a replacement computer that allows the G1 Honda Insight to safely use modern lithium traction batteries. My long term vision is to eventually offer a similar computer for...

LiBSU - Redesigning the "Battery Support Unit" to Support Lithium]]> 128 Fri, 05 Jun 2026 20:55:57 +0000 https://priuschat.com/threads/mechanics-what-are-your-most-common-tools.171048/ https://priuschat.com/threads/mechanics-what-are-your-most-common-tools.171048/ invalid@example.com (PixelRogue) PixelRogue 445 Sat, 30 May 2026 15:23:25 +0000 https://priuschat.com/threads/what-are-the-tools-i-need-to-take-out-the-nut-of-hell-on-the-egr-cooler.251463/ https://priuschat.com/threads/what-are-the-tools-i-need-to-take-out-the-nut-of-hell-on-the-egr-cooler.251463/ invalid@example.com (Mathews) Mathews 4 Thu, 28 May 2026 22:44:36 +0000 https://priuschat.com/threads/battery-change.260172/ https://priuschat.com/threads/battery-change.260172/ invalid@example.com (Swafdal Ahmed) Swafdal Ahmed 3 Mon, 18 May 2026 19:28:04 +0000 https://priuschat.com/threads/hv-cell-load-test-balancing.260061/ https://priuschat.com/threads/hv-cell-load-test-balancing.260061/ invalid@example.com (PriuSocal) PriuSocal
The 1st is this video where the guy uses a Viking 12v Battery tester to test each battery cell under load....

HV Cell Load Test & Balancing]]> Sun, 17 May 2026 13:15:34 +0000 https://priuschat.com/threads/2011-prius-a-c-compressor-not-functioning.181326/ https://priuschat.com/threads/2011-prius-a-c-compressor-not-functioning.181326/ invalid@example.com (KevEng) KevEng
2011 Prius a/c compressor not functioning]]> 22 Wed, 13 May 2026 19:39:19 +0000 https://priuschat.com/threads/head-gasket-replacement-oil-sludge.259916/ https://priuschat.com/threads/head-gasket-replacement-oil-sludge.259916/ invalid@example.com (hwmcclure) hwmcclure
Head gasket replacement, oil sludge]]> 10 Thu, 07 May 2026 17:37:12 +0000 https://priuschat.com/threads/pump-noise.259948/ https://priuschat.com/threads/pump-noise.259948/ invalid@example.com (Dan0) Dan0 It will make this sound when I first get in the car but it's doing it about every 18 seconds driving around town now.
It's a whirring sound, starts out higher pitch and then winds down.

Anyone know what it is and if I should be concerned?
Thanks]]> 3 Tue, 28 Apr 2026 17:08:53 +0000 https://priuschat.com/threads/can-i-bleed-the-stroke-simulator-without-starting-linear-valve-offset.259675/ https://priuschat.com/threads/can-i-bleed-the-stroke-simulator-without-starting-linear-valve-offset.259675/ invalid@example.com (jzs175) jzs175 I replaced only the brake booster pump and now I want to make sure there is no air left in the system. (sometimes I hear sounds near the brake pedal that seem like air in the system).

In Techstream, the only place I found that bleeds this part is Utility - ABS actuator has been replaced. But after that, Techstream wants to run Linear Valve Offset.

Can I press EXIT when Techstream asks to start the valve calibration, and will that end the procedure safely without...

Can I bleed the stroke simulator without starting Linear Valve Offset?]]> 9 Sun, 26 Apr 2026 13:28:36 +0000 https://priuschat.com/threads/head-gasket-swap-questions.259702/ https://priuschat.com/threads/head-gasket-swap-questions.259702/ invalid@example.com (andreimontreal) andreimontreal Amayama for a gasket kit and the overhaul vs grind kit is less expensive. Doesn't make sense - apparently they're both Toyota. From what I know Amayama is all genuine parts, right? Based on other parts, they might be Daihatsu parts (still Toyota, but "cheaper") - but it's not stated there.

Rebuild videos often have Felt Pro - are those better than...

Head Gasket Swap - Questions]]> 6 Sat, 25 Apr 2026 12:55:11 +0000 https://priuschat.com/threads/brake-pad-replacement.259808/ https://priuschat.com/threads/brake-pad-replacement.259808/ invalid@example.com (jxl278) jxl278
I put the recommended maintenance below from both places:

Thanks!...

Brake pad replacement?]]> 6 Mon, 20 Apr 2026 13:24:19 +0000 https://priuschat.com/threads/steering-column-rattling-noise.238328/ https://priuschat.com/threads/steering-column-rattling-noise.238328/ invalid@example.com (Bob Tme) Bob Tme
Hi - I'm new to the Forum but looking for help please! I have a 2015 Gen 3 Base Model Prius w/ 25,000 miles.

The car has developed an annoying hard rattle when driving on bumpy (think cobblestoned) streets at any speed. It sounds to me like it is metal-to-metal but unsure. However on smooth roads there is not any sounds made remotely similar to this rattle. The car has never been in an accident and has been well maintained.

This is what I have done so...

Steering Column Rattling Noise]]> 9 Mon, 20 Apr 2026 13:15:45 +0000 https://priuschat.com/threads/gen-3-persona-steering-rattle-solved.255497/ https://priuschat.com/threads/gen-3-persona-steering-rattle-solved.255497/ invalid@example.com (Personality) Personality
Secondarily, Avalons, Camrys, some Lexus, and certainly Gen 4 Prii can be found on videos, but Gen 3 harder, until I found this one brilliant man below:

The procedure is not for the faint...

Gen 3 Persona steering rattle solved.]]> 2 Sun, 19 Apr 2026 23:23:48 +0000 https://priuschat.com/threads/power-steering-damper.232914/ https://priuschat.com/threads/power-steering-damper.232914/ invalid@example.com (abubin) abubin
However, I cannot find any video or guide on this for Gen 3 Prii.

Anyone have a guide or video on how to get this replaced? Thanks!


View attachment 225851]]> 13 Sun, 19 Apr 2026 01:33:39 +0000 https://priuschat.com/threads/mando-struts-for-gen-3-prius.236970/ https://priuschat.com/threads/mando-struts-for-gen-3-prius.236970/ invalid@example.com (Michael Wood) Michael Wood
I decided to give Mando a try on my 2015 Prius. I bought the struts (complete assemblies - spring, strut, mount, bellows) at Rockauto for $129 each. About 1/3 less expensive than KYB.

They were packaged up nice. Both fit and finish were perfect. I weighed the complete assemblies of both the new...

Mando Struts for Gen 3 Prius]]> 14 Thu, 16 Apr 2026 05:01:14 +0000 https://priuschat.com/threads/replacing-hybrid-battery-on-my-2014-toyota-prius.259707/ https://priuschat.com/threads/replacing-hybrid-battery-on-my-2014-toyota-prius.259707/ invalid@example.com (Nick D) Nick D I have already removed my hybrid battery from the car and am bringing it with me to the dealership tomorrow. I plan on swapping out the battery in the parking lot and bringing necessary tools. Are there any existing posts explaining how to do the swap with an oem one that I can follow that anyone knows of? Everything I could find is relating to aftermarket batteries. Thanks in advance!]]> 1 Sun, 05 Apr 2026 00:36:16 +0000 https://priuschat.com/threads/spark-plug-gap-lets-think-about-this.212718/ https://priuschat.com/threads/spark-plug-gap-lets-think-about-this.212718/ invalid@example.com (Nor'easter) Nor'easter
The factory gap on these is pretty big at 0.044" or so, and this leads to a dumb question from a long time shade tree wrench and new-to-Prius guy...

Given the incidence of cold start misfires on this engine, why aren't we running these plugs at something like 0.032 - 0.035"? Anyone got a good reason not to do this?]]> 30 Sat, 04 Apr 2026 15:52:28 +0000 https://priuschat.com/threads/compression-leak-down-test-advise.248231/ https://priuschat.com/threads/compression-leak-down-test-advise.248231/ invalid@example.com (bobby515) bobby515 thinking guy's could be correct. have a defective egr, valve..broke. inside. have an oem comming.
driven the car 10k since last june. no code's no oil or coolant loss.
thinking the rumble on take off could be the head gasket.
test equiment i have .
cam scope coming today.
head leakdown tester coming today...
had regular compression tester.
i still think it's the EGR..car has alot of power 202k on it.
poor mileage..was getting 50 now for awhile 37..off and on it's good...

Compression leak down test advise]]> 15