2018-2025 Toyota Misfire DTCs in Cold Temperatures TSB

Some 2018-2025 Toyota Avalon, Camry, Corolla, Corolla Cross, and RAV4 vehicles may experience the Malfunction Indicator Lamp (MIL) illuminating on the dashboard. This condition is typically accompanied by specific misfire Diagnostic Trouble Codes (DTCs) and occurs during cold soak startup, specifically when engine coolant temperatures are between 14°F and 41°F. This technical service bulletin, T-SB-0010-24 Rev1, provides a detailed repair procedure for this issue.

This bulletin is a revision, updated on February 21, 2024 (Rev1). The revision notice, dated December 17, 2024, indicates that applicability has been updated to include 2019–2025 model year Corolla, 2022–2025 model year Corolla Cross, and 2025 model year RAV4 vehicles. Additionally, the Introduction, Warranty Information, Parts Information, Required Tools & Equipment, and Repair Procedure sections have all been updated. Any previous printed versions of this bulletin should be discarded.

Symptoms

Owners of affected vehicles, including those experiencing a Toyota Camry misfire DTC, may observe the Malfunction Indicator Lamp (MIL) turning on. This warning light indicates a potential problem with the engine or emissions system. The condition is specifically linked to cold weather operation, occurring after a cold soak start when the engine coolant is between 14°F (-10°C) and 41°F (5°C).

Fault Codes / DTCs

The "MIL ON" condition will be accompanied by one or more of the following Diagnostic Trouble Codes (DTCs):

Code	Description
P030027	Random/Multiple Cylinder Misfire Detected (Emission) Signal Rate of Change Above Threshold
P030000	Random/Multiple Cylinder Misfire Detected
P030100	Cylinder 1 Misfire Detected
P030200	Cylinder 2 Misfire Detected
P030300	Cylinder 3 Misfire Detected
P030400	Cylinder 4 Misfire Detected

Diagnosis and Trigger Conditions

Diagnosing this issue involves a series of checks to confirm the specific conditions outlined in the bulletin. The primary trigger for this issue is a cold soak startup with engine coolant temperatures ranging from 14°F (-10°C) to 41°F (5°C).

1. Confirm Condition: Technicians will first confirm that the "MIL ON" condition is present and that one or more of the listed misfire DTCs (P030027, P030000, P030100, P030200, P030300, P030400) are stored. If these conditions are not met, the bulletin does not apply, and further diagnosis should follow the applicable Repair Manual.
2. Verify Coolant Temperature: Using freeze frame data, it must be confirmed that the "MIL ON" occurred when engine coolant temperatures were between 14°F and 41°F. If the temperature condition is not met, this bulletin is not applicable.
3. Check Compression: Engine compression must be confirmed to be within specifications. Technicians will refer to the Toyota Technical Information System (TIS) for the applicable model and model year Repair Manual, performing "ONLY step 11" of the engine compression check. If compression is not within specifications, this bulletin does not apply.
4. Inspect Ignition System: The spark plugs and ignition coils must be confirmed to be functioning properly. This involves referring to the TIS Repair Manual for the specific model and year. If proper ignition is not exhibited, the bulletin does not apply.
5. Verify Injector Resistance: The resistance values for both direct and port injectors must be within specifications. Technicians will consult the TIS Repair Manual for detailed inspection procedures. If resistance values are out of specification, this bulletin does not apply.
6. Inspect Fuel System: A thorough inspection of the fuel system is required to ensure it is within specifications, again referencing the TIS Repair Manual. If the fuel system is not within specification, this bulletin does not apply.

Repair Procedure Summary

The core of the repair for the Toyota Camry misfire DTC and other affected models involves replacing all exhaust side hydraulic lash adjusters. This is a complex procedure requiring significant engine disassembly, and technicians must follow detailed steps outlined in the TIS Repair Manuals for each specific model and model year.

1. Remove Exhaust Side Hydraulic Lash Adjusters:

   • Remove the Camshaft: The camshaft must first be removed. Technicians will refer to the TIS Repair Manual for the specific model (e.g., 2021-2022 Avalon, 2018-2024 Camry, 2019-2025 Corolla, 2022-2025 Corolla Cross, 2019-2025 RAV4) and the "Engine / Hybrid System – [Engine Type] (Engine Mechanical) – Camshaft – Removal" section.
   • Remove Hydraulic Lash Adjusters: After camshaft removal, the hydraulic lash adjusters are removed. This step also requires referring to the TIS Repair Manual for the specific model and the "Engine / Hybrid System – [Engine Type] (Engine Mechanical) – Engine Unit – Disassembly" section. Crucially, technicians are instructed to perform "ONLY steps 45 and 46" for Avalon, Camry, and Corolla Cross models, and "ONLY steps 41 and 42" for Corolla models (depending on production date).

2. Install New Exhaust Side Hydraulic Lash Adjusters:

   • New exhaust side hydraulic lash adjusters are installed. It is critical to use only the new part numbers listed in this bulletin, not any superseding part numbers. This process involves referring to the TIS Repair Manual for the specific model and the "Engine / Hybrid System – [Engine Type] (Engine Mechanical) – Engine Unit – Reassembly" section. Technicians are instructed to perform specific steps, such as "ONLY steps 26 and 27" for Avalon, early Camry, and RAV4 models, "ONLY steps 27 and 28" for later Camry models, "ONLY steps 21 and 22" or "ONLY steps 22 and 23" for Corolla models, and "ONLY steps 20 and 21" for Corolla Cross models.

3. Reinstall the Camshaft: After the new lash adjusters are in place, the camshaft is reinstalled. This involves referring to the TIS Repair Manual for the specific model and the "Engine / Hybrid System – [Engine Type] (Engine Mechanical) – Camshaft – Installation" section.

4. Final Verification: After the repair is complete, all DTCs must be cleared using a GTS+ diagnostic tool. The vehicle is then tested by performing a Confirmation Driving Pattern at coolant temperatures between 14°F and 41°F to ensure the condition is no longer present. Technicians must refer to the TIS Repair Manual for the specific model and the "SFI System – P030000, P030027, P030085-P030400; Random/Multiple Cylinder Misfire Detected" section, performing "ONLY the Confirmation Driving Pattern steps."

Important Warnings

Do NOT use any part numbers other than those specifically listed in this bulletin. Toyota explicitly states: "ONLY use the NEW part numbers listed and NOT ANY superseding part numbers." Using incorrect parts will not resolve the issue and may void warranty coverage for the repair.

Required Tools or Parts

Only NEW part numbers listed in this bulletin should be used. The following parts are required for the repair:

Part Number (NEW)	Description	Quantity
13750-70020	Adjuster Assy, Valve Lash	8
90301-#####	Ring, O	1
90301-#####	Ring, O (for Cam Timing Control Motor)	1
90301-#####	Ring, O (for Cam Timing Oil Control Solenoid)	1
29343-#####	Ring, O Vacuum Pump, No. 1	1
23224-#####	Gasket, Fuel Pump Spacer	1
11213-#####	Gasket, Cylinder Head Cover	1
11213-#####	Gasket, Cylinder Head Cover, No. 2	6
11159-#####	Gasket, Camshaft Bearing Cap Oil Hole	1

Special tools required for this repair include:

• Techstream ADVi (Part Number: TSADVUNIT)
• Techstream 2.0 (Part Number: TS2UNIT)
• Techstream Lite (Part Number: TSLITEPDLR01)
• Techstream Lite (Green Cable) (Part Number: TSLP2DLR01)

It is essential that the GTS+ Software version 2024.03.004.02 or later is used for diagnostic and programming purposes. Only one Techstream unit is required.

Warranty Information

This repair is covered under the Toyota Powertrain Warranty. This warranty is valid for 60 months or 60,000 miles, whichever occurs first, from the vehicle's original in-service date. Warranty application is strictly limited to the specific condition described in this bulletin, meaning other issues found during diagnosis will not be covered under this specific TSB's warranty claim.

Owner Action

If your 2018-2025 Toyota Avalon, Camry, Corolla, Corolla Cross, or RAV4 is exhibiting a Malfunction Indicator Lamp (MIL) with misfire DTCs during cold starts, especially if you've encountered a "MIL ON" condition with a Toyota Camry misfire DTC, it is recommended to schedule an appointment with an authorized Toyota dealership. The dealership technicians are equipped with the necessary diagnostic tools and have access to the specific repair procedures outlined in T-SB-0010-24 Rev1 to correctly diagnose and resolve this issue under warranty.

NHTSA ID: 11012762