P1604
8 owner reports and 21 manufacturer filings across 17 model years from Subaru, Toyota.
Where P1604 shows up
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports | Parts |
|---|---|---|---|---|
| 2018 Toyota RAV4 | Electrical System | — | 4 | Battery → |
| 2017 Toyota Highlander | Fuel/Propulsion System | 2 | — | Fuel pump → |
| 2016 Toyota Highlander | Fuel/Propulsion System | 2 | — | Fuel pump → |
| 2018 Toyota Sequoia | Equipment Adaptive/Mobility | 2 | — | |
| 2017 Toyota Sequoia | Equipment Adaptive/Mobility | 2 | — | |
| 2016 Toyota Sequoia | Equipment Adaptive/Mobility | 2 | — | |
| 2019 Toyota Tundra | Engine | 2 | — | |
| 2018 Toyota Tundra | Equipment Adaptive/Mobility | 2 | — | |
| 2017 Toyota Tundra | Equipment Adaptive/Mobility | 2 | — | |
| 2016 Toyota Tundra | Engine | 2 | — | |
| 2020 Subaru Ascent | Engine | 1 | — | |
| 2019 Subaru Ascent | Engine | 1 | — | |
| 2020 Subaru Crosstrek | Engine | — | 1 | |
| 2019 Subaru Crosstrek | Engine | — | 1 | |
| 2016 Toyota Camry | Engine | — | 1 | |
| 2018 Toyota Corolla | Power Train | — | 1 | |
| 2018 Toyota Highlander | Electrical System | 1 | — | Battery → |
A model year appears here because the code is named in its record, not because every one of these vehicles sets it. Counts are mentions in the federal files, not failure rates — nobody publishes the denominator.
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P1604 by make
The same record, one make at a time: the model years, bulletins and owner reports that name P1604 on that maker’s vehicles.
What it gets filed under
What owners said
Source: NHTSA complaint databaseOwners’ own words, one per nameplate, scrubbed of anything identifying. These are unverified reports filed with NHTSA — they are what was said, not a finding that it was true.
An OBD2 scanner was used to diagnose the vehicle, and DTC: P0741, P075B, P1604, P2757, P2820(X4) were retrieved, which were related to the torque converter
After the vehicle was towed to a Subaru Dealership, the service notes stated “DIAGNOSED NO START SCANNED AND FOUND P1604 STARTABILITY MALFUNCTION, AND P0304 CYLINDER 4 MISFIRE, CHECKED FUEL PRESSURE AND FOUND IT WAS WITHIN SPEC, FOUND THE…
3 trouble codes were recorded p1603(engine stall), P1604 startability malfunction, and p1605(rough idling), however they were unable to determine root cause of stalling and refused to keep my car to do further analysis despite the fact…
Each time was simply told "normal operation" or "could not duplicate"...it is intermittent had received a call from my service advisor that they pulled codes showing the following; P1604 - startability malfunction P2610 - ecm/pcm internal…
21 manufacturer filings name P1604. Start with what the maker wrote down.
A code names the test that failed, not the part. A bulletin that names it is often a diagnosis someone has already written down — quote its number at the service desk.
Manufacturer filings that name it
Source: NHTSA manufacturer communicationsService bulletins and campaigns whose filed summary names P1604.
- T-SB-0166-19_Rev Service bulletin2020-01-23 · Engine And Engine Cooling
- TSB: REVISION NOTICE January 23, 2020 Rev1: G1439 The Parts Information, Calibration Information, and Repair Procedure sections have been updated. SUPERSESSION NOTICE The information contained in this bulletin supersedes Service Bulletin No. T-SB-0058-13. Service Bulletin No. T-SB-0058-13 is obsolete and any printed versions should be discarded. Some 2009 ? 2018 model year Sequoia and 2009 ? 2019
- T-SB-0166-19 Service bulletin2019-12-06 · Equipment Adaptive/Mobility
- TSB: SUPERSESSION NOTICE The information contained in this bulletin supersedes Service Bulletin No. T-SB-0058-13. Service Bulletin No. T-SB-0058-13 is obsolete and any printed versions should be discarded. Some 2009 ? 2018 model year Sequoia and 2009 ? 2019 model year Tundra vehicles equipped with a 3UR-FBE engine may exhibit a hard start and/or MIL ON condition with one or more of the following D
- 11-192-19 Service bulletin2019-10-25 · Engine And Engine Cooling
- This bulletin announces availability of reprogramming files to optimize the Engine Control Module (ECM). The new files will address isolated concerns of an extended cranking (hard starting) condition. They will also address a DTC P1604 which may be stored in the ECM memory without illuminating the Check Engine light.
- T-SB-0072-19 Service bulletin2019-06-24 · Electrical System
- TSB: Some 2014 ? 2018 model year Highlander and Highlander Hybrid vehicles may exhibit one or more of the following conditions. ? Various drivability concerns ? Low or no fuel pressure ? Diagnostic Trouble Codes (DTCs) (Including but not limited to P1603, P1604, P1605, P0171, P0300, P0302, P0304, U0100) ? Some 2014 ? 2018 model year Highlander Hybrid vehicles may exhibit DTC P134A. These conditio
- T-TT-0462-17 Service bulletin2017-11-14 · Fuel System, Other — Storage — Tank Assembly — Pressure Relief Devices
- T-TT: Vehicles may experience various drivability concerns. Upon diagnosis, technicians commonly find no or low fuel pressure as well as a variety of DTCs (Commonly P1603, P1604, P1605, P0171, P0300, P0302, P0304, U0100). Technicians find that the cause this condition is corrosion and water in the A43 ECM connector (Fig 1). In several cases, it was found that the source of water was from aftermark
What P1604 means
Source: SAE J2012 / OBD-IIP1604 is a manufacturer-specific code: the second character is a 1, which under the OBD-II standard hands the definition to whoever built the vehicle. The same code can mean one thing on a Ford and something unrelated on a Hyundai. Any site that prints a single definition for it is guessing.
A stored code names the test that failed, never the part that caused it. It is the starting point of a diagnosis, not its conclusion — the same code has several possible causes and the cheap one is not always right.
Common questions about P1604
Source: NHTSA files and the OBD-II standardWhy does this page not define P1604?
Because it cannot be defined honestly. The second character of a trouble code says who owns its meaning, and a 1 or a 3 hands that to the manufacturer. Sites that print one definition for a manufacturer-specific code are showing you one automaker's meaning and hoping it is yours.
Can I keep driving with P1604 stored?
Nobody can answer that from the code alone, and a site that does is guessing. A steady light means a fault was logged and the car should be checked soon; a flashing light means a severe misfire — slow down and get it seen as soon as possible, because severe misfire can quickly damage the catalytic converter. The safe read of this page is the mileage and the components, not permission.
Does a code mean the car is recalled?
No. Recalls are filed by campaign and matched by VIN, and none of them are triggered by a scan tool. If you want to know whether an open recall applies to one specific vehicle, check the VIN at nhtsa.gov/recalls — that is the only source that settles it.
Why do the counts here differ from other sites?
Because these are not estimates. Every number on this page is a count of documents in NHTSA's own files: manufacturer communications that name the code in their filed summary, and owner complaints that name it in the narrative. We do not model, weight or extrapolate them.
Will clearing the code fix it?
Clearing turns the light off and erases the freeze-frame data a technician would have used to work out what happened. If the condition is still there the code returns, usually within a few drive cycles, and the diagnosis now starts from less information than before.