check engine CHEVROLET TAHOE 2017 4.G Service Manual
[x] Cancel search | Manufacturer: CHEVROLET, Model Year: 2017, Model line: TAHOE, Model: CHEVROLET TAHOE 2017 4.GPages: 465, PDF Size: 7.47 MB
Page 413 of 465

Chevrolet Tahoe/Suburban Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-9955986) - 2017 - crc - 7/5/16
412 Service and Maintenance
frequent checks and services. The
Additional Required Services -
Normal are for vehicles that:
.Carry passengers and cargo
within recommended limits on
the Tire and Loading Information
label. See Vehicle Load
Limits 0247.
. Are driven on reasonable road
surfaces within legal driving
limits.
. Use the recommended fuel. See
Fuel 0298.
Refer to the information in the
Maintenance Schedule Additional
Required Services - Normal chart.
The Additional Required Services -
Severe are for vehicles that are:
. Mainly driven in heavy city traffic
in hot weather.
. Mainly driven in hilly or
mountainous terrain.
. Frequently towing a trailer.
. Used for high speed or
competitive driving. .
Used for taxi, police, or delivery
service.
Refer to the information in the
Maintenance Schedule Additional
Required Services - Severe chart.
{Warning
Performing maintenance work can
be dangerous and can cause
serious injury. Perform
maintenance work only if the
required information, proper tools,
and equipment are available.
If they are not, see your dealer to
have a trained technician do the
work. See Doing Your Own
Service Work 0322.
Maintenance
Schedule
Owner Checks and Services
At Each Fuel Stop
.
Check the engine oil level. See
Engine Oil 0325.
Once a Month
. Check the tire inflation
pressures. See Tire
Pressure 0369.
. Inspect the tires for wear. See
Tire Inspection 0375.
. Check the windshield washer
fluid level. See Washer
Fluid 0338.
Engine Oil Change
When the CHANGE ENGINE OIL
SOON message displays, have the
engine oil and filter changed within
the next 1 000 km/600 mi. If driven
under the best conditions, the
engine oil life system may not
indicate the need for vehicle service
for up to a year. The engine oil and
filter must be changed at least once
Page 414 of 465

Chevrolet Tahoe/Suburban Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-9955986) - 2017 - crc - 7/5/16
Service and Maintenance 413
a year and the oil life system must
be reset. Your trained dealer
technician can perform this work.
If the engine oil life system is reset
accidentally, service the vehicle
within 5 000 km/3,000 mi since the
last service. Reset the oil life
system when the oil is changed.
SeeEngine Oil Life System 0327.
Tire Rotation and Required
Services Every 12 000 km/
7,500 mi
Rotate the tires, if recommended for
the vehicle, and perform the
following services. See Tire
Rotation 0375.
. Check engine oil level and oil
life percentage. If needed,
change engine oil and filter, and
reset oil life system. See Engine
Oil 0325 andEngine Oil Life
System 0327.
. Check engine coolant level. See
Engine Coolant 0333.
. Check windshield washer fluid
level. See Washer Fluid 0338. .
Visually inspect windshield wiper
blades for wear, cracking,
or contamination. See Exterior
Care 0402. Replace worn or
damaged wiper blades. See
Wiper Blade
Replacement 0345.
. Check tire inflation pressures.
See Tire Pressure 0369.
. Inspect tire wear. See Tire
Inspection 0375.
. Visually check for fluid leaks.
. Inspect engine air cleaner filter.
See Engine Air Cleaner/
Filter 0331.
. Inspect brake system. See
Exterior Care 0402.
. Visually inspect steering,
suspension, and chassis
components for damaged, loose,
or missing parts or signs of wear
at least once a year. See
Exterior Care 0402. Lubricate
the suspension and steering
components at least every other
oil change (if equipped with
grease fittings). .
Check restraint system
components. See Safety System
Check 090.
. Visually inspect fuel system for
damage or leaks.
. Visually inspect exhaust system
and nearby heat shields for
loose or damaged parts.
. Lubricate body components. See
Exterior Care 0402.
. Check starter switch. See Starter
Switch Check 0344.
. Check automatic transmission
shift lock control function. See
Automatic Transmission Shift
Lock Control Function
Check 0344.
. Check ignition transmission lock.
See Ignition Transmission Lock
Check 0344.
. Check parking brake and
automatic transmission park
mechanism. See Park Brake and
P (Park) Mechanism
Check 0345.
Page 416 of 465

Chevrolet Tahoe/Suburban Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-9955986) - 2017 - crc - 7/5/16
Service and Maintenance 415
Maintenance Schedule
Additional Required
Services - Normal12 000 km/7,500 mi
24 000 km/15,000 mi
36 000 km/22,500 mi
48 000 km/30,000 mi
60 000 km/37,500 mi
72 000 km/45,000 mi
84 000 km/52,500 mi
96 000 km/60,000 mi
108 000 km/67,500 mi
120 000 km/75,000 mi
132 000 km/82,500 mi
144 000 km/90,000 mi
156 000 km/97,500 mi
168 000 km/105,000 mi 180 000 km/112,500 mi
192 000 km/120,000 mi
204 000 km/127,500 mi
216 000 km/135,000 mi
228 000 km/142,500 mi
240 000 km/150,000 mi
Rotate tires and perform Required Services.
Check engine oil level and oil life percentage.
Change engine oil and filter, if needed.@ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @
Replace passenger compartment air filter. (1)@ @@@@@
Inspect evaporative control system. (2)@ @@
Replace engine air cleaner filter. (3)@@@
Change transfer case fluid, if equipped with
4WD. (4)@
Replace spark plugs. Inspect spark plug wires.@
Drain and fill engine cooling system. (5)@
Visually inspect accessory drive belts. (6)@
Replace brake fluid. (7)
Footnotes—Maintenance
Schedule Additional Required
Services - Normal
(1) Or every two years, whichever
comes first. More frequent
passenger compartment air filter
replacement may be needed if
driving in areas with heavy traffic,
poor air quality, high dust levels, or environmental allergens.
Passenger compartment air filter
replacement may also be needed if
there is reduced airflow, window
fogging, or odors. Your GM dealer
can help determine when to replace
the filter.
(2)
Visually check all fuel and vapor
lines and hoses for proper
attachment, connection, routing, and
condition.
(3) Or every four years, whichever
comes first. If driving in dusty
conditions, inspect the filter at each
oil change or more often as needed.
Page 418 of 465

Chevrolet Tahoe/Suburban Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-9955986) - 2017 - crc - 7/5/16
Service and Maintenance 417
Maintenance Schedule
Additional Required
Services - Severe12 000 km/7,500 mi
24 000 km/15,000 mi
36 000 km/22,500 mi
48 000 km/30,000 mi
60 000 km/37,500 mi
72 000 km/45,000 mi
84 000 km/52,500 mi
96 000 km/60,000 mi
108 000 km/67,500 mi
120 000 km/75,000 mi
132 000 km/82,500 mi
144 000 km/90,000 mi
156 000 km/97,500 mi
168 000 km/105,000 mi 180 000 km/112,500 mi
192 000 km/120,000 mi
204 000 km/127,500 mi
216 000 km/135,000 mi
228 000 km/142,500 mi
240 000 km/150,000 mi
Rotate tires and perform Required Services.
Check engine oil level and oil life percentage.
Change engine oil and filter, if needed.@ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @
Replace passenger compartment air filter. (1)@ @@@@@
Inspect evaporative control system. (2)@ @@
Replace engine air cleaner filter. (3)@@@
Change automatic transmission fluid and filter.@@@
Change transfer case fluid, if equipped with
4WD. (4)@@@
Replace spark plugs. Inspect spark plug wires.@
Drain and fill engine cooling system. (5)@
Visually inspect accessory drive belts. (6)@
Replace brake fluid. (7)
Footnotes—Maintenance
Schedule Additional Required
Services - Severe
(1) Or every two years, whichever
comes first. More frequent
passenger compartment air filter
replacement may be needed if
driving in areas with heavy traffic, poor air quality, high dust levels,
or environmental allergens.
Passenger compartment air filter
replacement may also be needed if
there is reduced airflow, window
fogging, or odors. Your GM dealer
can help determine when to replace
the filter.
(2)
Visually check all fuel and vapor
lines and hoses for proper
attachment, connection, routing, and
condition.
(3) Or every four years, whichever
comes first. If driving in dusty
conditions, inspect the filter at each
oil change or more often as needed.
Page 420 of 465

Chevrolet Tahoe/Suburban Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-9955986) - 2017 - crc - 7/5/16
Service and Maintenance 419
.To avoid break-down or failure to
start the vehicle, maintain a
battery with full cranking power.
. Trained dealer technicians have
the diagnostic equipment to test
the battery and ensure that the
connections and cables are
corrosion-free.
Belts
. Belts may need replacing if they
squeak or show signs of
cracking or splitting.
. Trained dealer technicians have
access to tools and equipment
to inspect the belts and
recommend adjustment or
replacement when necessary.
Brakes
Brakes stop the vehicle and are
crucial to safe driving.
. Signs of brake wear may include
chirping, grinding, or squealing
noises, or difficulty stopping. .
Trained dealer technicians have
access to tools and equipment
to inspect the brakes and
recommend quality parts
engineered for the vehicle.
Fluids
Proper fluid levels and approved
fluids protect the vehicle’s systems
and components. See
Recommended Fluids and
Lubricants 0421 for GM approved
fluids.
. Engine oil and windshield
washer fluid levels should be
checked at every fuel fill.
. Instrument cluster lights may
come on to indicate that fluids
may be low and need to be
filled.
Hoses
Hoses transport fluids and should
be regularly inspected to ensure
that there are no cracks or leaks.
With a multi-point inspection, your
dealer can inspect the hoses and
advise if replacement is needed. Lamps
Properly working headlamps,
taillamps, and brake lamps are
important to see and be seen on
the road.
.
Signs that the headlamps need
attention include dimming, failure
to light, cracking, or damage.
The brake lamps need to be
checked periodically to ensure
that they light when braking.
. With a multi-point inspection,
your dealer can check the lamps
and note any concerns.
Shocks and Struts
Shocks and struts help aid in control
for a smoother ride.
. Signs of wear may include
steering wheel vibration, bounce/
sway while braking, longer
stopping distance, or uneven
tire wear.
. As part of the multi-point
inspection, trained dealer
technicians can visually inspect
the shocks and struts for signs
Page 427 of 465

Chevrolet Tahoe/Suburban Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-9955986) - 2017 - crc - 7/5/16
426 Technical Data
Vehicle Data
Capacities and Specifications
The following approximate capacities are given in metric and English conversions. SeeRecommended Fluids and
Lubricants 0421 for more information.
Application Capacities
Metric English
Air Conditioning Refrigerant For the air conditioning system refrigerant type and charge amount, see the refrigerant label under thehood. See your dealer for more information.
Cooling System 16.5 L 17.4 qt
Engine Oil with Filter 7.6 L 8.0 qt
Fuel Tank Short Wheelbase 98.4 L 26.0 gal
Long Wheelbase 119.2 L 31.5 gal
Transfer Case Fluid 1.5 L 1.6 qt
Wheel Nut Torque 190 Y140 lb ft
All capacities are approximate. When adding, be sure to fill to the approximate level, as recommended in this
manual. Recheck fluid level after filling.
Page 445 of 465

Chevrolet Tahoe/Suburban Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-9955986) - 2017 - crc - 7/5/16
444 OnStar
.Obtain and customize the Wi-Fi®
hotspot name or SSID and
password, if equipped.
Press
Qto connect to an
Advisor to:
. Verify account information or
update contact information.
. Get driving directions.
. Receive a Diagnostic check of
the vehicle's key operating
systems.
. Receive Roadside Assistance.
. Manage Wi-Fi Settings,
if equipped.
Press
>to get a priority connection
to an OnStar Advisor available
24/7 to:
. Get help for an emergency.
. Be a Good Samaritan or
respond to an AMBER Alert.
. Get assistance in severe
weather or other crisis situations
and find evacuation routes.
OnStar Services
Emergency
Emergency Services require an
active, OnStar service plan
(excludes Basic Plan). With
Automatic Crash Response, built-in
sensors can automatically alert a
specially trained OnStar Advisor
who is immediately connected in to
the vehicle to help.
Press
>for a priority connection to
an OnStar Advisor who can contact
emergency service providers, direct
them to your exact location, and
relay important information.
With OnStar Crisis Assist, specially
trained Advisors are available
24 hours a day, 7 days a week, to
provide a central point of contact,
assistance, and information during a
crisis.
With Roadside Assistance, Advisors
can locate a nearby service provider
to help with a flat tire, a battery
jump, or an empty gas tank.
Security
If equipped, OnStar provides these
services:
. With Stolen Vehicle Assistance,
OnStar Advisors can use GPS to
pinpoint the vehicle and help
authorities quickly recover it.
. With Remote Ignition Block™,
if equipped, OnStar can block
the engine from being restarted.
. With Stolen Vehicle Slowdown
®,
if equipped, OnStar can work
with law enforcement to
gradually slow the vehicle down.
Theft Alarm Notification
If equipped, if the doors are locked
and the vehicle alarm sounds, a
notification by text, e-mail, or phone
call will be sent. If the vehicle is
stolen, an OnStar Advisor can work
with authorities to recover the
vehicle.
Page 454 of 465

Chevrolet Tahoe/Suburban Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-9955986) - 2017 - crc - 7/5/16
Index 453
IndexA
Accessories andModifications . . . . . . . . . . . . . . . . . . 321
Accessory Power . . . . . . . . . . . . . . . 258
Active Fuel Management
®. . . . . . 261
Adaptive Cruise Control . . . . . . . . 280
Add-On Electrical Equipment . . . 318
Additional Information OnStar
®. . . . . . . . . . . . . . . . . . . . . . 448
Additional Maintenance
and Care . . . . . . . . . . . . . . . . . . . . . . 418
Adjustable Throttle and Brake Pedal . . . . . . . . . . . . . . . . . . . 251
Adjustments
Lumbar, Front Seats . . . . . . . . . . . . 68
Agreements Trademarks and License . . . . . 224
Air Cleaner/Filter, Engine . . . . . . . 331
Air Conditioning . . . . . . . . . . . 226, 230
Air Filter, Passenger Compartment . . . . . . . . . . . . . . . . . 232
Air Vents . . . . . . . . . . . . . . . . . . . . . . . 231
Airbag System Check . . . . . . . . . . . . . . . . . . . . . . . . 103
How Does an Airbag
Restrain? . . . . . . . . . . . . . . . . . . . . . 96
Passenger Sensing System . . . . 98 Airbag System (cont'd)
What Makes an Airbag
Inflate? . . . . . . . . . . . . . . . . . . . . . . . . 96
What Will You See after an
Airbag Inflates? . . . . . . . . . . . . . . . 97
When Should an Airbag Inflate? . . . . . . . . . . . . . . . . . . . . . . . . 95
Where Are the Airbags? . . . . . . . . 93
Airbags
Adding Equipment to theVehicle . . . . . . . . . . . . . . . . . . . . . . 102
Passenger Status Indicator . . . 150
Readiness Light . . . . . . . . . . . . . . 149
Servicing Airbag-Equipped Vehicles . . . . . . . . . . . . . . . . . . . . . 102
System Check . . . . . . . . . . . . . . . . . . 92
Alarm Vehicle Security . . . . . . . . . . . . . . . . 53
Alert Lane Change . . . . . . . . . . . . . . . . . 294
Side Blind Zone (SBZA) . . . . . . 294
All-Season Tires . . . . . . . . . . . . . . . . 363
All-Terrain Tires . . . . . . . . . . . . . . . . . 364
AM-FM Radio . . . . . . . . . . . . . . . . . . . 204
Antenna Multi-band . . . . . . . . . . . . . . . . . . . . 208
Rear Side Window . . . . . . . . . . . . 207
Antilock Brake System (ABS) . . . 272
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Chevrolet Tahoe/Suburban Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-9955986) - 2017 - crc - 7/5/16
454 Index
Antilock Brake System(ABS) (cont'd)
Warning Light . . . . . . . . . . . . . . . . . 154
Appearance Care
Exterior . . . . . . . . . . . . . . . . . . . . . . . 402
Interior . . . . . . . . . . . . . . . . . . . . . . . . 406
Armrest Storage . . . . . . . . . . . . . . . . 126
Assistance Program, Roadside . . . . . . . . . . . . . . . . . . . . . . 433
Assistance Systems for Driving . . . . . . . . . . . . . . . . . . . . . . . . 290
Assistance Systems for Parking and Backing . . . . . . . . . . 288
Audio Theft-Deterrent Feature . . . . . . . 199
Audio Players CD . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
Automatic
Door Locks . . . . . . . . . . . . . . . . . . . . . 46
Forward Braking . . . . . . . . . . . . . . 293
Headlamp System . . . . . . . . . . . . 192
Level Control . . . . . . . . . . . . . . . . . 277
Transmission . . . . . . . . . . . . . . . . . 262
Transmission Fluid . . . . . . . . . . . 328
Automatic Transmission Manual Mode . . . . . . . . . . . . . . . . . 265
Shift Lock Control FunctionCheck . . . . . . . . . . . . . . . . . . . . . . . 344 Auxiliary Jack . . . . . . . . . . . . . . . . . . . 213
Axle, Front . . . . . . . . . . . . . . . . . . . . . . 341
Axle, Rear . . . . . . . . . . . . . . . . . . . . . . 342
B
Battery
Load Management . . . . . . . . . . . . 196
Power Protection . . . . . . . . . . . . . 197
Voltage and Charging
Messages . . . . . . . . . . . . . . . . . . . 166
Battery - North America . . . . 340, 393
Blade Replacement, Wiper . . . . . 345
Blind Spot Mirrors . . . . . . . . . . . . . . . 58
Bluetooth Overview . . . . . . . . . . . 214, 215, 219
Brake Pedal and Adjustable
Throttle . . . . . . . . . . . . . . . . . . . . . . 251
System Warning Light . . . . . . . . 153
Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . 338 Antilock . . . . . . . . . . . . . . . . . . . . . . . 272
Assist . . . . . . . . . . . . . . . . . . . . . . . . . 273
Fluid . . . . . . . . . . . . . . . . . . . . . . . . . . 339
Parking . . . . . . . . . . . . . . . . . . . . . . . 273
System Messages . . . . . . . . . . . . 167
Braking . . . . . . . . . . . . . . . . . . . . . . . . . 236
Automatic Forward . . . . . . . . . . . 293
Break-In, New Vehicle . . . . . . . . . . 251
Bulb Replacement . . . . . . . . . . . . . . 351 Bulb Replacement (cont'd)
Fog Lamps . . . . . . . . . . . . . . . . . . . 348
Front Turn Signal Lamps . . . . . 348
Halogen Bulbs . . . . . . . . . . . . . . . . 347
Headlamp Aiming . . . . . . . . . . . . . 347
Headlamps . . . . . . . . . . . . . . 347, 348
High Intensity Discharge
(HID) Lighting . . . . . . . . . . . . . . . 347
License Plate Lamps . . . . . . . . . 350
Taillamps, Turn Signal,
Stoplamps, and Back-up
Lamps . . . . . . . . . . . . . . . . . . . . . . 349
Buying New Tires . . . . . . . . . . . . . . . 377
C
Calibration . . . . . . . . . . . . . . . . . . . . . . 135
California Fuel Requirements . . . . . . . . . . . 299
Perchlorate MaterialsRequirements . . . . . . . . . . . . . . . 321
California Proposition
65 Warning . . . . . . . . . .320, 340, 393
Canadian Vehicle Owners . . . . . . . . 2
Capacities and
Specifications . . . . . . . . . . . . . . . . . 426
Carbon Monoxide Engine Exhaust . . . . . . . . . . . . . . . 261
Liftgate . . . . . . . . . . . . . . . . . . . . . . . . . 47
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Chevrolet Tahoe/Suburban Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-9955986) - 2017 - crc - 7/5/16
Index 455
Carbon Monoxide (cont'd)Winter Driving . . . . . . . . . . . . . . . . 244
Cargo Tie-Downs . . . . . . . . . . . . . . . . . . . . 127
Caution, Danger, and Warning . . . . 3
CD Player . . . . . . . . . . . . . . . . . . . . . . 208
Center Console Storage . . . . . . . . 126
Center Seat . . . . . . . . . . . . . . . . . . . . . 68
Chains, Tire . . . . . . . . . . . . . . . . . . . . 381
Charging Wireless . . . . . . . . . . . . . . . . . . . . . . 138
Charging System Light . . . . . . . . . 151
Check Ignition Transmission Lock . . . 344
Malfunction Indicator
Engine Light . . . . . . . . . . . . . . . . 151
Child Restraints Infants and Young Children . . . 106
Lower Anchors and Tethers
for Children . . . . . . . . . . . . . . . . . . 111
Older Children . . . . . . . . . . . . . . . . 104
Securing . . . . . . . . . . . . 119, 121, 122
Systems . . . . . . . . . . . . . . . . . . . . . . 108
Child-View Mirror . . . . . . . . . . . . . . . . 60
Cleaning Exterior Care . . . . . . . . . . . . . . . . . 402
Interior Care . . . . . . . . . . . . . . . . . . 406 Climate Control Systems
Dual Automatic . . . . . . . . . . . . . . . 226
Rear . . . . . . . . . . . . . . . . . . . . . . . . . . 230
Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
Cluster, Instrument . . . . . . . . . . . . . 141
Collision Damage Repair . . . . . . . 436
Compartments Storage . . . . . . . . . . . . . . . . . . . . . . . 125
Compass . . . . . . . . . . . . . . . . . . . . . . . 135 Messages . . . . . . . . . . . . . . . . . . . . 167
Connections
OnStar
®. . . . . . . . . . . . . . . . . . . . . . 445
Control . . . . . . . . . . . . . . . . . . . . . . . . . 276 Traction and ElectronicStability . . . . . . . . . . . . . . . . . . . . . 274
Control Light
Hill Descent . . . . . . . . . . . . . . . . . . 154
Control of a Vehicle . . . . . . . . . . . . . 236
Convenience Net . . . . . . . . . . . . . . . 127
Convex Mirrors . . . . . . . . . . . . . . . . . . 57
Coolant Engine . . . . . . . . . . . . . . . . . . . . . . . . 333
Engine Temperature Gauge . . 147
Cooling . . . . . . . . . . . . . . . . . . . . 226, 230
Cooling System . . . . . . . . . . . . . . . . . 332 Engine Messages . . . . . . . . . . . . 168
Courtesy Transportation Program . . . . . . . . . . . . . . . . . . . . . . . 435 Cruise Control . . . . . . . . . . . . . . . . . . 278
Light . . . . . . . . . . . . . . . . . . . . . . . . . . 157
Messages . . . . . . . . . . . . . . . . . . . . 167
Cruise Control, Adaptive . . . . . . . . 280
Cupholders . . . . . . . . . . . . . . . . . . . . . 125
Customer Assistance . . . . . . . . . . . 432 Offices . . . . . . . . . . . . . . . . . . . . . . . . 431
Text Telephone (TTY)
Users . . . . . . . . . . . . . . . . . . . . . . . 432
Customer Information Service Publications
Ordering Information . . . . . . . . 438
Customer Satisfaction Procedure . . . . . . . . . . . . . . . . . . . . . 429
D
Damage Repair, Collision . . . . . . . 436
Danger, Warning, and Caution . . . . 3
Data CollectionInfotainment System . . . . . . . . . . 442
OnStar . . . . . . . . . . . . . . . . . . . . . . . 441
Data Recorders, Event . . . . . . . . . 441
Daytime Running Lamps (DRL) . . . . . . . . . . . . . . . . . . 192
Defensive Driving . . . . . . . . . . . . . . . 236
Delayed Locking . . . . . . . . . . . . . . . . . 46
Diagnostics OnStar
®. . . . . . . . . . . . . . . . . . . . . . 447
Distracted Driving . . . . . . . . . . . . . . . 235