Toyota Prius Hybrid Battery Error Codes

Possible Causes:

• Faulty wheel speed sensor

• Damaged sensor wiring or connector

• Debris or corrosion at sensor hub

• Faulty ABS module

Solution:

• Inspect and clean wheel speed sensor and hub

• Test sensor and replace if faulty

• Repair damaged wiring or connectors

• Check ABS module if sensor replacement does not resolve code

Possible Causes:

• Faulty brake pressure sensor or brake booster

• Malfunctioning ABS/ESC module

• Low brake fluid level

• Air in brake lines or contaminated brake fluid

• Wiring issues or poor electrical connections in brake system

Solution:

• Inspect and replace faulty brake pressure sensor or booster if needed

• Check and repair ABS/ESC module wiring and connections

• Ensure brake fluid is at proper level and replace if contaminated

• Bleed air from brake lines

• Replace ABS/ESC module if it is defective after other checks

Possible Causes:

• TCS disabled due to previous ABS or wheel sensor faults

• Faulty traction control module

• Low brake fluid level affecting TCS

• Faulty yaw rate or steering angle sensor

Solution:

• Resolve any ABS/wheel sensor codes (like C1236) first

• Check brake fluid level and top up if needed

• Inspect TCS module and related sensors

• Replace defective modules or sensors if required

• Possible Causes: Battery, inverter, or system issue

• Solution: Diagnose and repair specific component

Possible Causes:

• Dirty or faulty throttle body

• Clogged fuel filter or weak fuel pump

• Low-quality fuel or clogged injectors

• Faulty MAF/MAP sensor

• Ignition issues (spark plugs, coils)

• Engine compression problems

Solution:

• Inspect and clean the throttle body

• Check fuel pressure, replace fuel filter/pump if needed

• Use high-quality fuel, clean or replace injectors if necessary

• Diagnose and replace MAF/MAP sensor if required

• Replace worn spark plugs/coils

• Perform a compression test and repair the engine if needed

Possible Causes:

• Fuel system malfunction (fuel not reaching cylinders)

• Ignition system problems

• Discharged or faulty HV battery (engine won’t crank)

• Starter/inverter issues that crank the ICE

• Faulty crankshaft or camshaft position sensor

• Fuel freezing/low temperature (common in winter)

Solution:

• Check fuel level and quality, and fuel system pressure

• Inspect spark plugs and coils, replace if necessary

• Ensure HV battery is charged (and no other battery codes present)

• Diagnose the inverter and engine starting system

• Check CKP/CMP sensors (crankshaft/camshaft)

• In cold weather – use engine heater or winter-grade fuel

• Possible Causes: Damaged connectors or wiring

• Solution: Check and repair high-voltage connections

• Possible Causes: Inverter or battery issues

• Solution: Inspect inverter and battery

Possible Causes:

• Faulty ABS control module

• Damaged or disconnected wiring/connectors in the CAN network

• Blown fuse related to ABS module

• Intermittent communication issues due to ECU problems

Solution:

• Inspect ABS module and wiring harness for damage

• Check and replace any blown fuses

• Reconnect or repair loose/disconnected connectors

• Replace ABS control module if faulty

Possible Causes:

• Faulty BCM

• Broken or loose wiring in CAN bus

• Poor ground connections

• Other ECU causing communication interference

Solution:

• Inspect BCM wiring and connectors

• Ensure proper grounding of BCM

• Scan other ECUs for faults that may block communication

• Replace BCM if found defective