✅ Fixed
Found 150mA parasitic drain. Isolated to interior light circuit — door switch staying on. Replaced door pin switch $15. Battery maintaining charge perfectly.
Lexus IS 2021 Battery draining overnight parasitic drain
2021
On This Page:
🔍 Symptoms
⚙️ Causes
🔧 All Repairs
⚠️ Avoid These
🧾 Driver Reports
🔗 Similar Faults
🩺 Related Symptoms
📖 Repair Guides
⚡ Quick Summary
Severity Level
Medium
Safe to Drive?
⚠️ Drive with Caution
Safety Impact
Indirect risk — worth monitoring, not urgent
Urgency Level
🟡 Monitor Closely
Lexus IS 2021 battery dead every morning. Replaced battery twice. Something draining it overnight. 134586 km. This fault code is stored when the engine control unit detects a specific fault condition. Common causes include sensor failures, wiring faults, and component wear. Always read additional fault codes before replacing parts — multiple codes together provide a clearer diagnosis. Clear the code after repair and test drive to confirm the fault does not return.
🔍 Symptoms
📍 Battery draining overnight
📍 Lexus IS
⚙️ Possible Causes
Battery draining overnight
Lexus IS
Possible: Found 150mA parasitic drain. Isolated to interior light circuit — door switch staying on. Replaced door pin switch $15. Battery maintaining charge perfectly.
Repair / Solution
Based on 64 driver confirmations
⚠️ Wrong Diagnosis?
No commonly reported misdiagnoses for this fault yet. If you have replaced a part that did not fix this 2021 problem, submit a wrong diagnosis report — it helps other drivers avoid the same costly mistake.
🧾 Driver Reports
📖 Related Repair Guides
Help other owners by sharing your experience.
Your real-world fix helps thousands of drivers worldwide. Takes 2 minutes.