Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA20254RUNNER SR5, 4WDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTENTERTAINMENT SYSTEMSACTIVE NOISE CONTROL SYSTEM (W/ STEREO AMP) - DIAGNOSTIC CODES & CIRCUIT TESTSACTIVE NOISE CONTROL SYSTEM (W/ STEREO COMPONENT AMPLIFIER)DTC U0100-87: LOST COMMUNICATION WITH ECM/PCM "A" MISSING MESSAGE; DTC U0101-87: LOST COMMUNICATION WITH TCM MISSING MESSAGE; DTC U0129-87: LOST COMMUNICATION WITH BRAKE SYSTEM CONTROL MODULE MISSING MESSAGE; DTC U0140-87: LOST COMMUNICATION WITH BODY CONTROL MODULE MISSING MESSAGE; DTC U0164-87: LOST COMMUNICATION WITH HVAC CONTROL MODULE MISSING MESSAGE [12/2024 - ]DESCRIPTION
2025 Toyota 4Runner SR5, 4WD
DTC U0100-87: Lost Communication With ECM/PCM "A" Missing Message; DTC U0101-87: Lost Communication with TCM Missing Message; DTC U0129-87: Lost Communication With Brake System Control Module Missing Message; DTC U0140-87: Lost Communication with Body Control Module Missing Message; DTC U0164-87: Lost Communication with HVAC Control Module Missing Message [12/2024 - ]: Description
2025 Toyota 4Runner SR5, 4WDSECTION Description
These DTCs are stored when a malfunction occurs in the CAN communication circuit.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | DTC Output from | Priority |
|---|---|---|---|---|---|
| U0100-87 | Lost Communication With ECM/PCM "A" Missing Message | When the stereo component equalizer assembly detects a CAN communication malfunction in the ECM for 1 second or more continuously 3 seconds after the ignition switch is turned to ON* | CAN communication system | Active Noise Control | B |
| U0101-87 | Lost Communication with TCM Missing Message | When the stereo component equalizer assembly detects a CAN communication malfunction in the TCM for 1 second or more continuously 3 seconds after the ignition switch is turned to ON* | CAN communication system | Active Noise Control | B |
| U0129-87 | Lost Communication With Brake System Control Module Missing Message | When the stereo component equalizer assembly detects a CAN communication malfunction in the brake system for 1 second or more continuously 3 seconds after the ignition switch is turned to ON* | CAN communication system | Active Noise Control | B |
| U0140-87 | Lost Communication with Body Control Module Missing Message | When the stereo component equalizer assembly detects a CAN communication malfunction in the main body ECU (multiplex network body ECU) for 3 seconds or more continuously 3 seconds after the ignition switch is turned to ON* | CAN communication system | Active Noise Control | B |
| U0164-87 | Lost Communication with HVAC Control Module Missing Message | When the stereo component equalizer assembly detects a CAN communication malfunction in the air conditioning system for 25 seconds or more continuously 3 seconds after the ignition switch is turned to ON* | CAN communication system | Active Noise Control | B |
HINT:
*: Malfunction monitoring is not performed during the following conditions to prevent erroneous detection.
- The auxiliary battery voltage is less than 9.5 V.
- Before 3 seconds have elapsed after the auxiliary battery voltage has returned to normal.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.