Engine Camshaft Position Sensor Guide for the 1995-1999 GMC Yukon
A no-start or stalling in your Yukon could be this critical sensor—here is what you need to know before you buy a replacement.
- The sensor is located inside the distributor at the rear of the engine, making replacement difficult.
- Symptoms often include a no-start condition, stalling, rough idle, and a P0340 trouble code.
- Due to the high labor involved, using a top-tier brand like ACDelco or Delphi is strongly recommended to avoid repeat repairs.
- A faulty sensor can cause the engine to stall while driving, which is a significant safety risk.
Symptoms of a Failing Camshaft Position Sensor
When the camshaft position sensor in your Yukon starts to fail, it can't send a clear signal to the engine's computer. This can cause a variety of noticeable problems. You should suspect a bad sensor if you experience one or more of the following issues.
Common Failure Symptoms
- Check Engine Light: This is often the first sign. A code like P0340, P0341, or P0342 will be stored in the computer.
- Engine Won't Start: The engine may crank but refuse to start because the computer isn't getting the signal it needs to create spark and inject fuel.
- Engine Stalling: The engine may stall unexpectedly while driving or when idling at a stoplight. This can be a dangerous situation.
- Rough Idle: Your truck may vibrate or run unevenly while sitting in park or at a stop.
- Poor Acceleration: You might notice the truck feels sluggish, hesitates, or lacks power when you press the gas pedal.
- Reduced Fuel Economy: Incorrect engine timing leads to inefficient fuel combustion, making you fill up the tank more often.
Installation: Not a Simple Sensor Swap
Crucial Information for 1995-1999 Yukon Owners: Unlike on many modern vehicles, the camshaft position sensor on the 5.7L V8 engine is not an easily accessible, bolt-on part. It is located inside the distributor, at the top rear of the engine against the firewall. This makes replacement significantly more difficult.
Access is very tight, and the work is often done by feel. Because the sensor is tied to the distributor, which controls engine timing, replacing it improperly can cause more significant running issues. In many cases, mechanics will replace the entire distributor assembly rather than just the sensor inside it. This is not a job for a beginner. If you are not experienced with setting engine timing, this repair is best left to a professional.
Choosing the Right Aftermarket Sensor
When a part is this difficult to replace, you want to do the job only once. The quality of the replacement sensor is critical. While saving money is tempting, a cheap sensor that fails early will cost you more in the long run with repeated labor. For this specific part on your Yukon, sticking to higher-quality brands is highly recommended by mechanics and owners.
Brand Quality Tiers
Tier 1: OEM-Grade (Highly Recommended)
- ACDelco & Delphi: ACDelco is the original GM parts brand, and Delphi was the original equipment manufacturer for many of these parts before being spun off. For critical electronics, these brands provide the highest likelihood of a correct fit, proper function, and long-term reliability. Given the labor involved in this repair, spending extra for an ACDelco or Delphi part is a smart investment.
Tier 2: Reputable Aftermarket (Good Alternative)
- Standard Motor Products (SMP), NGK/NTK: These are well-regarded aftermarket brands. Standard Motor Products, in particular, has a long history of producing quality engine management components. Just be sure to avoid their lower-cost "T-Series" line for a critical part like this. These brands are a solid choice if an OEM-grade part is not available.
Tier 3: Economy Brands (Use With Caution)
- Dorman, Store Brands, Unbranded eBay/Amazon parts: While brands like Dorman offer a wide range of parts at low prices, their electronic sensors have a reputation in online forums for higher failure rates. For an easily accessible part, this might be an acceptable risk. However, because this sensor is so difficult to replace on your Yukon, using a budget part is strongly discouraged.
| Part Type | Estimated Cost |
|---|---|
| New OEM (ACDelco) | $55 - $90 |
| New Aftermarket | $24 - $65 |
| Shop Labor | $120 - $250 |
Frequently Asked Questions (FAQ)
Where is the camshaft position sensor located on a 1995-1999 GMC Yukon?
On the 5.7L V8 engine, it is located inside the distributor assembly. The distributor is at the top-rear of the engine, near the firewall.
Can I drive with a bad camshaft position sensor?
It is not recommended. The most significant risks are the engine stalling in traffic, which is a major safety hazard, or the vehicle not starting at all, leaving you stranded.
Why is this replacement so much harder than on other cars?
The sensor's location inside the distributor is the main reason. It requires working in a tight, blind space against the firewall and may require distributor removal or timing adjustments, which is much more complex than a simple external sensor swap.
Do I need to replace the whole distributor?
Not always, but it is often recommended. If the distributor itself is old, has a worn gear, or has excessive shaft play, replacing the entire assembly with a new one (which includes a new sensor) is the most reliable long-term repair. If the distributor is in excellent shape, a skilled mechanic can replace just the sensor inside it.
What is the most common trouble code for a bad cam sensor?
The most common code is P0340, which indicates a malfunction in the camshaft position sensor circuit. This doesn't always mean the sensor is bad; it could also be a wiring issue.
Technical Specifications
OEM Part Numbers: 10485432 10490645 19417445
Located inside the distributor assembly for 5.7L V8 engines. Often referred to as a distributor ignition pickup.
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.
- GMC Yukon: