Holden Colorado/Rodeo 2007-2012 factory workshop and repair manual download

- Quick overview
- Shift solenoids are electrical valves inside the transmission that control hydraulic pressure to change gears. On Holden Colorado/Rodeo models they are accessed by removing the transmission oil pan and either replacing the solenoid pack that bolts to the valve body or removing individual solenoids from the valve body (procedures vary by year/transmission). If you have basic hand tools you can do this, but it involves working under the vehicle, draining fluid, and handling a heavy valve body — follow safety precautions and consult a factory or Haynes/Chilton repair manual for your exact year/model/transmission code.

- Safety first (read and follow)
- Always work on a flat level surface, use wheel chocks, and support the vehicle on quality jack stands — never rely on a hydraulic jack alone.
- Wear safety glasses and nitrile or mechanic gloves. Have a fire extinguisher nearby if you’re using solvents.
- Transmission fluid is hot if the vehicle was recently driven; allow the vehicle to cool.
- If any step makes you uncomfortable, stop and consult a professional. Incorrect work can damage the transmission.

- Tools you need (each tool explained and how to use it)
- Quality socket set (metric sockets 8–19 mm, 1/4" and 3/8" drive)
- What it is: removable sockets that fit onto a ratchet to remove bolts.
- How to use: choose the correctly sized socket, fit it fully onto the fastener, pull the ratchet handle to loosen/tighten. Use extensions to reach recessed bolts.
- Ratchet handles (1/4" and 3/8") and extensions
- What: handle that drives sockets; extensions reach deep bolts.
- How to use: attach socket, insert extension if needed, keep handle aligned to avoid rounding bolts.
- Torque wrench (3/8" drive, suitable range for small transmission bolts)
- What: tool to tighten bolts to a specified torque.
- How to use: set the required torque on the wrench and tighten bolts until the wrench clicks or indicates the set torque. Do not guess torque — consult the service manual for values.
- Flat and Phillips screwdrivers
- What: used to pry small clips and remove screws.
- How to use: use correct head size to avoid stripping screws; use prying gently to avoid gouging mating surfaces.
- Drain pan (large, low-profile)
- What: container to catch transmission fluid when you drop the pan.
- How to use: position under the transmission pan before removing pan bolts; fluid will flow out as bolts are loosened.
- Jack and jack stands (2-ton or greater) or ramps
- What: lift and support the vehicle safely.
- How to use: lift at the manufacturer’s jacking points, place jack stands on solid points, lower vehicle onto stands; test stability before going under.
- Wheel chocks
- What: wedge to stop wheels from rolling.
- How to use: place behind rear wheels before lifting and working under car.
- Clean rags and lint-free shop towels
- What: clean parts, remove fluid, keep surfaces clean to avoid contamination.
- How to use: wipe mating surfaces, keep bolts and parts on a clean rack or magnetic tray.
- Pick set or small flat-blade pick
- What: remove O-rings and electrical connectors carefully.
- How to use: hook and pull connectors/O-rings gently to avoid damage.
- Magnetic tray or parts box
- What: keep bolts and small parts organized.
- How to use: place removed bolts and parts into the tray in the order you remove them.
- Funnel and measuring container
- What: to refill transmission fluid accurately.
- How to use: use a clean funnel to add fluid, measure total amount added.
- Brake cleaner or transmission-safe cleaner
- What: clean old fluid and grime off components.
- How to use: spray parts and wipe with rags; avoid over-spraying electrical connectors.
- Replacement pan gasket or RTV (depending on model)
- What: seals pan to transmission.
- How to use: scrape old gasket material, apply new gasket or RTV per instructions before reinstalling.
- New transmission filter (recommended)
- What: filters debris removed from fluid and protects valve body.
- How to use: remove old filter, install new filter in same orientation; some filters have seals that must be lubricated with fresh ATF.
- Replacement shift solenoid(s) or solenoid pack (see Parts section)
- What: the actual faulty part(s) you are replacing.
- How to use: unplug electrical connector, unbolt solenoid(s) from valve body or solenoid block, replace with new unit and torque fasteners to spec.
- Service manual or factory repair guide (highly recommended)
- What: contains vehicle-specific steps, torque specs, fluid type, and removal sequence.
- How to use: follow the manual’s procedure for your year/model/transmission code. Do not substitute general instructions for model-specific torque/sequence.

- Extra or specialty tools you may need and why
- Torque wrench (if you don’t already have one) — required because valve body/pan bolts need correct torque to avoid warping or leaks.
- Line wrench or spanner for certain fluid lines (rare) — prevents rounding off flared fittings if you need to disconnect fluid lines.
- Small transmission jack or large floor jack with a wooden block — optional but helpful to support the valve body if you need to remove it fully; valve body is heavy and awkward.
- Diagnostic scanner that reads transmission error codes (recommended)
- Why: to confirm solenoid fault codes (e.g., P0750–P0770 family) before replacing parts and to clear codes after repair.
- Multimeter
- Why: to test solenoid coil resistance and wiring integrity before buying parts (helps avoid unnecessary replacement).

- Parts replacement: what to replace and why
- Shift solenoid(s)
- Why: solenoids fail electrically or mechanically (sticking, burnt coil). Failure causes shifting problems, limp-mode, or codes.
- What to buy: replacement solenoid(s) or a solenoid pack specified for your vehicle’s transmission — order by VIN and year/model to ensure correct part. OEM or high-quality aftermarket recommended.
- Transmission filter (recommended)
- Why: the filter collects debris that likely caused or accompanied solenoid failure; replacing it prevents recontamination.
- What to buy: filter specified for your transmission model.
- Pan gasket or RTV sealant
- Why: pan must seal to prevent leaks when reinstalled.
- What to buy: OEM-style gasket or recommended RTV for transmissions.
- Transmission fluid (ATF)
- Why: you will lose fluid when pan is removed; contaminated fluid should be replaced or topped up.
- What to buy: the exact ATF type and capacity specified in the owner’s manual/service manual for your Holden Colorado/Rodeo — do not guess fluid type.
- Electrical connector or wiring repair parts (only if damaged)
- Why: corroded or broken wiring causes solenoid electrical failure.
- What to buy: connector kit, pins, and heat-shrink as needed.

- Basic procedure (concise steps — follow your model’s manual for specifics and torque values)
- Prepare vehicle: park on level surface, chock wheels, engage park and parking brake, raise and support vehicle on jack stands so you have safe access beneath.
- Drain pan partially: place drain pan under transmission; loosen pan bolts slowly from corner to corner allowing fluid to drain into pan; remove enough bolts to drop the pan carefully — do not remove all bolts and let pan fall.
- Remove pan and inspect: lower the pan, set aside and pour old fluid into a container for disposal; inspect for large metal shavings (indicates major internal damage).
- Remove filter: unbolt or unclip the transmission filter and let residual fluid drain; install new filter later.
- Locate solenoids/solenoid pack: identify the solenoid assembly on the valve body; it’ll be bolted on with electrical connectors attached.
- Disconnect electrical connectors: gently depress locking tabs and pull connectors free; use a pick to release stubborn clips.
- Remove solenoid(s): unbolt the solenoid pack or individual solenoids from the valve body. Keep bolts organized.
- Test if unsure: measure coil resistance with a multimeter or bench-test the solenoid if you want to confirm failure before installing new parts.
- Install new solenoid(s): fit new solenoid(s) or pack, replace any O-rings/seals, torque bolts to spec from the manual.
- Replace filter and pan gasket: install new filter, clean pan and magnet, replace the gasket or apply RTV as specified. Reinstall pan and tighten bolts in the sequence and torque specified by the manual.
- Refill fluid: lower vehicle, add specified ATF through dipstick tube or filler as instructed. Start with manufacturer’s recommended initial fill amount.
- Cycle and check: with parking brake engaged, start engine and cycle through gears slowly with brake depressed to circulate fluid. Check for leaks.
- Check fluid level and top up: with engine at operating temperature and on level ground, check level per owner’s manual procedure and adjust.
- Clear codes and test drive: use a scanner to clear stored codes, take a careful test drive, re-scan for codes and re-check fluid level.

- How to use diagnostic tools and verify repair
- Scanner: plug into OBD-II port, read transmission codes before beginning. After repair, clear codes and monitor for pending fault returns.
- Multimeter: set to ohms; disconnect solenoid connector and measure resistance across solenoid pins. Compare to spec in repair manual. Very high/open or zero/short indicates faulty coil.

- Common pitfalls and warnings
- Don’t overtighten pan/valve body bolts — can warp surfaces and cause leaks or internal binding.
- Do not let dirt get into the valve body; keep parts very clean.
- Replacing solenoids without testing wiring or reading codes can lead to unnecessary part purchases — test wiring and read codes first.
- If pan contents show a lot of metal or clutch material, this is a sign of internal failure — solenoid replacement alone may not fix the transmission.
- Using the wrong ATF can damage the transmission; always use the type specified by Holden/Isuzu.

- After-replacement checks
- Inspect for leaks around pan and solenoid electrical connectors.
- Verify proper gear changes and absence of limp mode.
- Recheck fluid level after a short drive, then again after a week of driving.

- Disposal and environmental
- Used transmission fluid and old parts should be taken to an auto shop or recycling center — do not dump them.

- Final note on parts ordering (no extra questions)
- Get the exact replacement solenoid(s) and filter for your vehicle using VIN/year/model and transmission code. Ask parts supplier for OEM part numbers or reputable aftermarket equivalents; common items are labeled as “shift solenoid A/B” or “solenoid pack” for your transmission.

(End — follow the factory service manual for torque values, removal sequences, and vehicle-specific cautions.)
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