DTC Description Possible Causes Action Intake valve solenoid 1 stuck
advanced a new module/component P0027-72
Exhaust Valve Control
Solenoid Circuit
Range/Performance (Bank 1)
- Actuator stuck open
NOTE: - Circuit VFS_EX_A -
Exhaust valve solenoid 1 angle
less than target
Exhaust valve solenoid 1 slow or
not operating
Check operation of exhaust valve
solenoid 1. Check and install a new
exhaust valve solenoid 1 as
required. Refer to the warranty policy
and procedures manual, or determine
if any prior approval programme is in
operation, prior to the installation of
a new module/component P0027-77
Exhaust Valve Control
Solenoid Circuit
Range/Performance (Bank 1)
- Commanded position not
reachable
NOTE: - Circuit VFS_EX_A -
Exhaust valve solenoid 1 angle
greater than target
Exhaust valve solenoid 1 not
returning to target in time
Exhaust valve solenoid 1 stuck
advanced
Check operation of exhaust valve
solenoid 1. Check and install a new
exhaust valve solenoid 1 as
required. Refer to the warranty policy
and procedures manual, or determine
if any prior approval programme is in
operation, prior to the installation of
a new module/component P0028-72
Intake Valve Control
Solenoid Circuit
Range/Performance (Bank 2)
- Actuator stuck open
NOTE: - Circuit VFS_IN_B -
Intake valve solenoid 2 angle less
than target
Intake valve solenoid 2 slow or not
operating
Check operation of intake valve
solenoid 2. Check and install a new
intake valve solenoid 2 as required.
Refer to the warranty policy and
procedures manual, or determine if
any prior approval programme is in
operation, prior to the installation of
a new module/component P0028-77
Intake Valve Control
Solenoid Circuit
Range/Performance (Bank 2)
- Commanded position not
reachable
NOTE: - Circuit VFS_IN_B -
Intake valve solenoid 2 angle
greater than target
Intake valve solenoid 2 not
returning to target in time
Intake valve solenoid 2 stuck
advanced
Check operation of intake valve
solenoid 2. Check and install a new
intake valve solenoid 2 as required.
Refer to the warranty policy and
procedures manual, or determine if
any prior approval programme is in
operation, prior to the installation of
a new module/component P0029-72
Exhaust Valve Control
Solenoid Circuit
Range/Performance (Bank 2)
- Actuator stuck open
NOTE: - Circuit VFS_EX_B -
Exhaust valve solenoid 2 angle
less than target
Exhaust valve solenoid 2 slow or
not operating
Check operation of exhaust valve
solenoid 2. Check and install a new
exhaust valve solenoid 2 as
required. Refer to the warranty policy
and procedures manual, or determine
if any prior approval programme is in
operation, prior to the installation of
a new module/component P0029-77
Exhaust Valve Control
Solenoid Circuit
Range/Performance (Bank 2)
- Commanded position not
reachable
NOTE: - Circuit VFS_EX_B -
Exhaust valve solenoid 2 angle
greater than target
Exhaust valve solenoid 2 not
returning to target in time
Exhaust valve solenoid 2 stuck
advanced
Check operation of exhaust valve
solenoid 2. Check and install a new
exhaust valve solenoid 2 as
required. Refer to the warranty policy
and procedures manual, or determine
if any prior approval programme is in
operation, prior to the installation of
a new module/component P0031-11
HO2S Heater Control Circuit
Low (Bank 1, Sensor 1) -
Circuit short to ground NOTES:
- Circuit HTR_CTRL_A_UPSTREAM -
LR - Circuit UHEGO HEATER A -
Pre catalyst oxygen sensor-odd
heater control circuit (Bank 1,
Sensor 1) circuit short circuit to
ground
Using the manufacturer approved
diagnostic system check datalogger
signal, Oxygen Sensor (O2S) Heater
Duty Cycle Bank 1 Sensor 1 (0x03A1)
Refer to the electrical circuit
diagrams and check pre catalyst
oxygen sensor-odd heater control
circuit (Bank 1, Sensor 1) circuit for
short circuit to ground
