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c1201
Moderate
Toyota · Sedans
Engine Control System Malfunction
Quick Answer
Error code C1201 on your Toyota Sedans means: Engine Control System Malfunction. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
Avalon XLE 2022Camry XSE 2024Camry Hybrid SE 2024Corolla SE 2024Corolla Hybrid LE 2024Crown Platinum 2024Mirai Limited 2024Prius XLE 2024Camry LE 2023Camry LE 2024Camry SE 2023Camry SE 2024Camry TRD 2024Camry XLE 2024Corolla LE 2023Corolla LE 2024Corolla XSE 2024Crown Limited 2024Crown XLE 2024Prius LE 2024Prius Limited 2024
Likely Causes
  1. Existing engine DTC triggering secondary C1201 code in ABS/VSC module
  2. Communication fault between engine ECM and ABS/VSC control module
  3. Faulty engine ECM not sending proper torque signal
  4. Damaged CAN bus wiring between ECM and body modules
  5. Low battery voltage causing intermittent module communication errors
How to Fix It
1
Scan all modules for DTCs, as C1201 is always triggered by another engine-related fault code
2
Diagnose and repair the primary engine DTC first (the root cause)
3
Check battery voltage and charging system output to rule out low-voltage communication issues
4
Inspect CAN bus wiring between the ECM and ABS/VSC module for damage
5
Clear all codes after repair and test drive to confirm the C1201 does not return
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Varies based on primary fault code
CAN bus wiring repair kit (if wiring fault found)
Battery (if low voltage is the cause)
Related Error Codes
P0171P0300P0301P0420P0441
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