c1201
Moderate
Toyota · SUVs
Engine Control System Malfunction
Quick Answer
Error code C1201 on your Toyota SUVs means: Engine Control System Malfunction. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
4Runner TRD Pro 2024Grand Highlander Limited 2024Highlander XLE 2024Highlander Hybrid Bronze Edition 2023Land Cruiser 1958 Edition 2024RAV4 XLE Premium 2024RAV4 Hybrid SE 2024Sequoia Capstone 20244Runner Limited 20244Runner SR5 20244Runner TRD Off-Road 2024Grand Highlander Platinum 2024Grand Highlander XLE 2024Highlander LE 2024Highlander Limited 2024Highlander Platinum 2024RAV4 Adventure 2024RAV4 LE 2024RAV4 TRD Off-Road 2024RAV4 XLE 2024Sequoia Limited 2024Sequoia Platinum 2024Sequoia SR5 2024Sequoia TRD Pro 2024Venza Limited 2024
Likely Causes
How to Fix It
1
Perform a full system scan of all modules to identify the primary engine fault code
2
Diagnose and repair the primary engine DTC first, as C1201 is a secondary response code
3
Check battery voltage and alternator output to rule out low-voltage communication issues
4
Inspect CAN bus wiring between the ECM and ABS/VSC module for chafing or damage
5
Clear all codes after repair and verify C1201 does not return after a test drive
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 or alternator (if charging system is the cause)
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