DTC P0C30-00: Hybrid/EV Battery State of Charge High [03/2023 - ]: Procedure

Pre-procedure1

• None

• Check for DTCs.

  Powertrain > HV Battery > Trouble Codes 

  Powertrain > Hybrid Control > Trouble Codes 

  Result

  Result	Proceed to
  "P0C30-00" only is output.	A
  DTCs except "P0C30-00" of hybrid battery system are output.	B
  DTCs except "P0C30-00" of hybrid control system are output.	C

Post-procedure1

• Turn the ignition switch off.

Result: 

B 

GO TO DTC CHART (HYBRID BATTERY SYSTEM). Refer To  DIAGNOSTIC TROUBLE CODE CHART [03/2023 - ] 

Result: 

C 

GO TO DTC CHART (HYBRID CONTROL SYSTEM) 

Refer to DIAGNOSTIC TROUBLE CODE CHART [03/2023 - 01/2025] , or refer to DIAGNOSTIC TROUBLE CODE CHART [01/2025 - ]

Result: 

A 

See step  2

Pre-procedure1

• None

• Read the freeze frame data of DTC P0C30-00.

  Powertrain > HV Battery > Trouble Codes 

  Result

  Result	Proceed to
  OFF is displayed for "Ready Signal", "SMRP Control Status", "SMRB Control Status" and "SMRG Control Status" and -0.5 A or less is displayed for "Hybrid/EV Battery Current".	A
  Other than above	B

  HINT: 

  As the ignition switch ON state may cause the DTC to be stored, freeze frame data is used to judge the cause of the DTC output.

Post-procedure1

• Turn the ignition switch off.

Result: 

B 

REPLACE HYBRID VEHICLE CONTROL ECU 

Refer to REMOVAL [03/2023 - ]

Result: 

A 

See step  3

Pre-procedure1

• Check that the service plug grip is not installed.
  NOTE:

  After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the repair information because this may cause a malfunction.

• Disconnect the HV battery high voltage connector from the No. 1 traction battery device box assembly.
  NOTE:

  Insulate each disconnected high-voltage connector with insulating tape. Wrap the connector from the wire harness side to the end of the connector.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

• Measure the resistance according to the value(s) in the table below.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a

  Component without harness connected (No. 1 Traction Battery Device Box Assembly)

  -

  -

  Standard Resistance (SMRB)

  Tester Connection	Condition	Specified Condition	Result
  w1-1 (CBI) - z25-1(+)	Ignition switch off	10 kΩ or higher	kΩ

  Standard Resistance (SMRG, SMRP)

  Tester Connection	Condition	Specified Condition	Result
  w2-1 (CEI) - z27-1(-)	Ignition switch off	10 kΩ or higher	kΩ

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Reconnect the HV battery high voltage connector to the No. 1 traction battery device box assembly.

Result: 

NG 

REPLACE NO. 1 TRACTION BATTERY DEVICE BOX ASSEMBLY 

Refer to REMOVAL [03/2023 - ]

Result: 

OK 

See step  4

Pre-procedure1

• Turn the ignition switch to ON (READY).
• Perform a road test.
  NOTE:

  Accelerate/decelerate gently. Avoid rapid acceleration/deceleration.

• Drive the vehicle with the value of Data List item "Hybrid/EV Battery Current" between -50 A to 50 A.

  Powertrain > HV Battery > Data List 

  Tester Display
  Hybrid/EV Battery Current

  HINT: 

  Distance and driving time are not specified.

• Turn the ignition switch off and leave the vehicle for 30 seconds or more.

• Check that the value of "Hybrid/EV Battery Current" is between - 0.5 A and 0.5 A with the ignition switch ON.

  Powertrain > HV Battery > Data List 

  Tester Display
  Hybrid/EV Battery Current

  NOTE:

  • If the value is outside the specified range, perform the road test again.
  • This DTC may be output if Current Sensor Offset Learning has not been completed.

  HINT: 

  • If the ignition switch is ON and the value of "Hybrid/EV Battery Current" is between - 0.5 A and 0.5 A, current sensor offset learning has been completed.
  • Even if the current sensor offset learning is not complete, the current sensor value will be corrected by repeating the road test a maximum of 7 times.

  Result

  Proceed to
  NEXT

Post-procedure1

• Turn the ignition switch off.

Result: 

NEXT 

END