A Guide to the Transmission Range Sensor for the 2004-2009 Chevrolet Colorado
Solve no-start problems and incorrect gear displays on your truck by understanding this critical sensor.
- A no-start condition where the engine doesn't crank is a primary symptom of a bad Transmission Range Sensor.
- This is a DIY-friendly repair; the sensor is on the outside of the transmission and requires no special tools.
- The diagnostic code P0705 almost always points to a problem with this sensor or its wiring.
- Proper alignment of the new sensor in the 'Neutral' position during installation is critical for it to work correctly.
Is Your Truck Refusing to Start? It Could Be the Transmission Range Sensor
If you turn the key in your Chevrolet Colorado and only hear a click, or if it won't crank at all, a bad transmission range sensor could be the problem. This part is a common failure point that can mimic more serious transmission or starter issues. Because it's a safety device, when it fails, it can prevent the engine from starting. It can also cause the gear indicator on your dash to be blank or show the wrong gear.
Symptoms of a Failing Transmission Range Sensor
A bad range sensor sends confusing signals to your truck's computer. Look out for these common signs:
- No-Start Condition: The engine won't crank, or it only starts in Neutral instead of Park (or vice-versa).
- Check Engine Light: A failure in the sensor's circuit will trigger the check engine light. The most common error code is P0705.
- Incorrect Gear Display: The PRNDL display on your instrument cluster may be blank, show dashes, or not match the gear you've selected.
- No Reverse Lights: Your backup lights may not turn on when you shift into reverse, which is a safety hazard.
- Erratic Shifting: In some cases, the truck may get stuck in one gear (known as "limp mode") or shift harshly because the computer is unsure of the correct gear.
No Recalls, But a Known Issue
While there are no official recalls or Technical Service Bulletins (TSBs) for the transmission range sensor on the 2004-2009 Colorado, its failure is a well-documented problem among owners. Do not confuse this with a recall for the brake light switch, which affects the same model years but is a different part.
Choosing the Right Aftermarket Sensor
For this repair, you have a choice between OEM (Original Equipment Manufacturer) and new aftermarket parts. Since the sensor is located on the outside of the transmission, the replacement is straightforward, making aftermarket parts a good, cost-effective option.
- Standard Ignition (SMP): Often considered a premium aftermarket brand, Standard Ignition parts are known for their robust design and reliable performance, meeting or exceeding original specifications. This is a solid choice if you want high quality and long-term peace of mind.
- Dorman: Dorman is a well-known brand that provides a direct-fit, value-oriented replacement. While some mechanics have mixed opinions on Dorman's consistency across all their parts, for an external sensor like this, it is generally considered an acceptable and budget-friendly solution.
Installation Pro-Tip
The key to a successful replacement is proper alignment. The new sensor must be installed while the transmission's manual shift lever is in the NEUTRAL position. Most aftermarket sensors have alignment marks or a specific installation procedure to ensure it reads the gears correctly. Failing to align it properly will cause the same symptoms as a bad sensor.
Estimated Replacement Costs
| Part or Service | Estimated Cost |
|---|---|
| New OEM (ACDelco) Part | $70 - $130 |
| New Aftermarket Part | $78 - $94 |
| Shop Labor | $100 - $200 |
Frequently Asked Questions
Is a transmission range sensor the same as a neutral safety switch?
Yes. For the 2004-2009 Chevrolet Colorado, these terms refer to the same part. It's also sometimes called a Park/Neutral Position (PNP) switch.
Can I replace this sensor myself?
Yes, this is a DIY-friendly job for most home mechanics. The sensor is located on the driver's side of the transmission where the shift cable connects. The job requires basic hand tools and safely lifting the vehicle, but no special alignment tools are typically needed if you follow the instructions.
What does the code P0705 mean?
P0705 stands for "Transmission Range Sensor Circuit Malfunction." It means the truck's computer has detected an incorrect, irrational, or missing signal from the sensor. This is the most common code associated with a failed sensor.
🎬 Watch: How to test and replace the sensor to clear code P0705What happens if I don't replace a bad sensor?
You risk being stranded if the truck refuses to start. Driving with a faulty sensor can also be unsafe due to the lack of reverse lights and the potential for erratic shifting or getting stuck in one gear. It is best to replace it as soon as symptoms appear.
Helpful Videos
Technical Specifications
OEM Part Numbers: 24221125
Located externally on the driver's side of the automatic transmission case. The sensor has an 11-pin electrical connector.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Chevrolet Colorado:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Truck Refusing to Start? It Could Be the Transmission Range Sensor
- Symptoms of a Failing Transmission Range Sensor
- No Recalls, But a Known Issue
- Choosing the Right Aftermarket Sensor
- Installation Pro-Tip
- Estimated Replacement Costs
- Frequently Asked Questions
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