Honda Rancher 420 Problems: Shifting, Steering, No-Start Fixes

Last updated on October 25th, 2026 at 10:51 am

This post contains Amazon affiliate links. As an Amazon Associate I earn from qualifying purchases, at no extra cost to you.

The most common Honda Rancher 420 problems are shift faults on electric-shift (ES) and automatic (DCT) models, heavy steering, overheating from a mud-packed radiator, and a no-start that turns out to be a switch, fuse or battery. The engine is liquid-cooled and fuel injected, so there is no carburetor to clean.

Start with the free checks: a fully charged battery, the engine stop switch, neutral, the fuses and a clean radiator. Honda's owner's manual lists those first, and they cost nothing.

Which fix applies depends on the version. The Rancher 420 comes as a foot-shift, an electric-shift and an automatic dual-clutch (DCT) machine, and a blinking dash or a 30 A fuse means different things on each.

Find your model code in the owner's manual (for example TRX420FA6) and match it below. Everything in this guide that carries a number comes from Honda's manuals, Honda's spec sheet or a federal recall notice, and owner-reported tips are labeled.

Which Rancher 420 do you have?

Model code	Shifting	Power steering	Ground clearance
TRX420FM1	Foot shift lever	No	7.2 in
TRX420FM2	Foot shift lever	Yes (EPS)	7.2 in
TRX420FE1	Electric shift, handlebar buttons	No	7.2 in
TRX420FA2	Automatic DCT	Yes (EPS)	7.2 in
TRX420FA5	Automatic DCT, independent rear suspension (IRS)	No	9.2 in
TRX420FA6	Automatic DCT, IRS	Yes (EPS)	9.2 in

Two facts clear up old advice. Every TRX420 uses Honda's PGM-FI fuel injection, and the 2014 redesign moved the fuel pump into the tank, according to Wikipedia's Honda Rancher entry.

Older guides that tell you to clean Rancher 420 carburetor jets are describing a different machine. The engine and transmission carried over through the 2014 redesign.

Honda Rancher 420 problems at a glance

Symptom	Check first (free)	Likely cause	See a dealer when
Gear indicator flashes or the shift buttons do nothing (ES)	Battery charge, terminals, 30 A shift motor fuse	Low voltage, blown fuse, sensor or connector fault (owner-reported)	Still flashing after those checks
Gear display shows a blinking dash (DCT)	Battery charge	Transmission not shifting properly	Always
Starter silent or only clicks	Ignition ON, stop switch at RUN, neutral, fuses, battery	Switch left off, blown fuse, weak battery	A new fuse blows again
Cranks but will not start	Fuel level, fresh fuel, spark plug	Empty tank, bad fuel, fouled plug	PGM-FI light stays on
Stalls or runs poorly	Coolant temperature indicator, fuel level	Overheating, or a fuel injection fault	PGM-FI light stays on
High coolant temperature light	Coolant reserve tank, mud on the radiator	Mud, low coolant, a leak	Light stays on after adding coolant
Heavy steering, PS light (EPS)	Cold tire pressure, battery, EPS fuse	Low pressure, weak battery, blown fuse	PS light stays on
4WD will not engage, front end binds	Stop fully, move the lever, check the 4WD light, look at CV boots	Torn CV boot, lever not fully moved	Boot torn or wheels do not drive
Battery keeps going flat	Full charge, clean terminals, maintainer	Short rides, poor connections, charging fault	Charged battery is flat again within days

The table is the short version. Each problem has its own section below, in the order to check things.

Skip to the checker if you would rather answer three questions and get your list.

Rancher 420 symptom checker

Pick your shifting type, power steering, model year and symptom. The tool lists the checks in order: free first, then tools, then the dealer. It also shows any recall that matches your year.

Every line comes from the manuals and notices linked in this post. Where Honda publishes nothing, the tool says so instead of guessing.

The checker cannot read codes or test parts. It puts the free checks ahead of the shop visit so you do not pay for a diagnosis a charger or a fuse could have answered.

If it says to stop, stop. A blinking dash on a DCT, a torn CV boot or a lit temperature indicator is a reason to park the machine, not a test.

1. The Rancher will not shift (ES and DCT)

Electric-shift models change gears with handlebar buttons and a shift motor. The TRX420FE1 manual lists a 30 A shift motor fuse, so the fuse is the cheapest part to rule out.

DCT models show the gear on the display. When the automatic transmission is not shifting properly, the TRX420FA5 manual says the gear position indicator shows a blinking dash and tells you to see your dealer.

1. Charge the battery fully and clean and tighten the terminals. The shift motor draws real current, and Honda does not recommend jump-starting, especially from an automobile battery.
2. Check the shift motor fuse (30 A on the ES manual) and the two main fuses (30 A and 10 A). Replace a blown fuse only with the same rating, and treat a fuse that blows again as a wiring fault.
3. Owner-reported: riders on a 2007 TRX420FE thread point to the angle sensor under the left fender and a sensor near the bottom left footpeg. Look for a cracked sensor, sheared wires, trail debris and dirty connectors.
4. After a deep crossing, let the connectors dry and coat them with dielectric grease. Honda's manual lists a maximum water depth of about 10 in.
5. The flash-code tables are in the Honda service manual, not the owner's manual. Counting flashes without the table tells you nothing, so a dealer or the manual has to read them.

If the dash still flashes, a dealer test is next. The same symptom on a different Honda is covered in our Foreman 500 gear indicator guide.

Emergency gear selection

When the shift buttons are dead and you are stuck in the wrong gear, Honda gives a manual method to reach a trailer. Use it only for that.

1. Stop the ATV, turn the ignition switch OFF and make sure nobody is on it.
2. Align the hexagonal hole of the gear change tool with the hexagonal end of the secondary spindle on the front crankcase.
3. Turn the tool counterclockwise to downshift and clockwise to upshift.
4. Load the ATV and see your dealer. Honda says to call the dealer if proper function cannot be restored.

The manual describes this as a way to get the machine to where it can be loaded, not as a repair. Honda also designs the Rancher as a rider-only ATV.

2. Will not start, or the starter is silent

Honda's own order for a starter that does not turn is short. Ignition switch ON, engine stop switch at RUN, transmission in neutral, then a blown fuse. Do those four before anything else.

1. Charge the battery and clean the terminals. The listed size is a YTX14-BS (12 V, 12 Ah) on the ES model and a GYZ16H (12 V, 16 Ah) on the DCT model.
2. If it cranks but will not fire, look at the fuel. The display shows LO FUEL and blinks when you are on the reserve of about 1.29 US gal in the 3.88 US gal tank.
3. Use unleaded fuel with a pump octane of 86 or higher, as Honda specifies.
4. Pull the plug and look for fouling. The ES manual lists an NGK BKR5E-11 or DENSO K16PR-U11.
5. Watch the PGM-FI indicator. It lights briefly at start-up and goes out. A light that stays on means the fuel injection system has an abnormality, and a dealer has to read it.

That is the whole free list. No carburetor, choke or petcock work applies to a TRX420, because it is fuel injected.

3. Stalls, bogs or runs poorly

The manual's entry for an engine that starts but runs poorly is to check the coolant temperature gauge and the high coolant temperature indicator. Heat comes first, even when the machine feels like a fuel problem.

1. Look at the temperature gauge and indicator. If the indicator is lit, stop and use the overheating steps below.
2. Check the fuel level and refuel with fresh unleaded gas.
3. Check the PGM-FI indicator. If it stays on, the fuel injection system has logged a fault.
4. Inspect the plug and the battery connections.

A stall with no light and no heat is a dealer job. Parts guessing on a fuel injected engine costs more than a code read.

4. Overheating and the coolant temperature light

The manual says the high coolant temperature indicator should light only for a moment when you turn the key on. If it comes on while riding, Honda says not to continue.

Honda lists the causes: restricted airflow to the radiator such as caked mud, long idling, an oil or coolant leak, low oil or coolant, and hard use in adverse conditions.

1. Stop, shut the engine off and let it cool.
2. Check the coolant reserve tank. If it is low or empty, do not ride without adding coolant.
3. Wash the mud off the radiator with a gentle stream.
4. Top up with a 50/50 mix of Pro Honda HP Coolant or equivalent. The ES manual lists 1.7 US qt for the system.
5. If the indicator stays on after you add coolant, do not ride. A reserve tank that keeps dropping points to a leak.

Muddy rides are the usual cause, so rinse the radiator after them. More trail-side checks for every ATV are in our ATV and UTV troubleshooting guide.

5. Heavy steering and the PS light

Models with electric power steering (EPS) have a PS indicator on the dash. The 2020 manual marks the system as TRX420FA6 only, and it places the EPS block fuse under the seat, behind the rear fender cover and the EPS fuse cover.

Without EPS, steering is mechanical, so a heavy utility ATV will always feel heavy at low speed. The first free check on any Rancher is tire pressure.

1. Check pressure when the tires are cold. The ES manual lists 4.4 psi front and rear, with a 3/16 in minimum tread. Our air-down pressure calculator covers trail pressures for other vehicles.
2. Charge the battery and clean the terminals.
3. On an EPS model, check the EPS block fuse and replace it only with the same rating.
4. If the PS light stays on, or the steering binds, pulls to one side or has play, stop riding and have a dealer inspect it.

6. 4WD will not engage and CV boot damage

The 4WD models use a 2WD/4WD select lever. The manual says to stop completely and keep both hands on the bar before moving it, and the 4WD indicator shows when four-wheel drive engages.

A torn CV boot is a safety problem, not just a wear item. A federal notice covered about 42,000 2007 and 2008 Ranchers because punctured boots can let the joints bind and cause a sudden loss of steering (CPSC notice 08-595).

1. Stop fully, move the lever and see if the 4WD indicator lights.
2. Look at the rubber boots at each front wheel for splits or grease slung around the wheel.
3. A torn boot means no riding until it is repaired. For 2007 and 2008 models, ask a dealer about the recall repair.
4. If the lever and indicator work but the front wheels do not drive, a dealer has to inspect the front differential.

7. Battery keeps going flat

The shift motor, EPS and fuel injection all need steady voltage, so a weak battery can look like several different failures. Honda lists a YTX14-BS on the ES model and a GYZ16H on the DCT model.

Short rides and storage drain a battery. A battery maintainer between rides keeps it charged, and Honda does not recommend jump-starting from a car battery.

If a fully charged battery is flat again within days, the charging system is next. The owner's manual gives no test values, so that check needs the Honda service manual or a dealer.

Rancher 420 recalls

Model years	Problem	Notice	Remedy
2007 and 2008 (about 42,000 units)	Punctured or torn CV boots can let joints bind and cause sudden loss of steering control	CPSC 08-595 (July 17, 2008)	Free repair at a Honda ATV dealer
2012 (about 19,500 units, including about 2,900 from February 2012)	A weld on the front right and left upper suspension arms can separate, causing loss of control	CPSC 13-713 (December 26, 2012)	Free repair at a Honda ATV dealer

Both notices tell owners to stop using the ATV until the free repair is done. If a dealer confirms the repair is already on record for your VIN, that recall is closed.

No fuel-system or engine recall for the TRX420 appears in the notices linked here.

Rancher 420 service numbers

Item	ES and foot-shift models (2019 FE1 manual)	DCT model (2020 FA5 manual)
Engine oil	SAE 10W-30, JASO T 903 MA	SAE 10W-30, JASO T 903 MA
Oil after draining	2.7 US qt	3.8 US qt (listed after draining and filter change)
Oil with filter change	2.9 US qt	3.8 US qt
Battery	YTX14-BS, 12 V, 12 Ah	GYZ16H, 12 V, 16 Ah
Spark plug	NGK BKR5E-11 or DENSO K16PR-U11	See your manual
Coolant	1.7 US qt, 50/50 Pro Honda HP Coolant	See your manual
Tire pressure (cold)	4.4 psi front and rear	See your manual
Fuel	Unleaded, pump octane 86 or higher	Same octane rating
Front and rear final drive oil	SAE 80W-90 Honda shaft drive oil	See your manual

Honda's maintenance minder indicator tracks the tripmeter and hour meter, and the manual says to reset them after each scheduled service. Follow the schedule in your own manual, since intervals differ by year.

Honda's 2024 spec release lists towing at 848 lb and rack limits of 66 lb front and 133 lb rear. The manual adds that cargo or trailer loads reduce acceleration, braking and turning ability.

FAQ

Related guides

• Honda Pioneer 500 problems
• Honda Big Red UTV problems
• Free off-road calculators