| “This site contains affiliate links for which OEMDTC may be compensated” |
NHTSA ID Number: 10111705
Manufacturer Communication Number: PIP4912E
Summary
This Preliminary Information communication provides information to the technician on vehicles that may have an intermittent high idle. If a technician has duplicated, or the customer description aligns with the speeds mentioned in the idle speed description tables, the idle speed should be considered a normal characteristic of current vehicle design.
39 Affected Products
Vehicles
| CHEVROLET | EXPRESS | 2010-2017 |
| CHEVROLET | SILVERADO | 2017 |
| CHEVROLET | SILVERADO 1500 | 2011, 2014 |
| CHEVROLET | SILVERADO 2500 | 2011-2016 |
| CHEVROLET | SILVERADO 3500 | 2013 |
| GMC | SAVANA | 2010-2017 |
| GMC | SIERRA | 2017 |
| GMC | SIERRA 1500 | 2014 |
| GMC | SIERRA 2500 | 2011-2016 |
| GMC | SIERRA DENALI | 2011-2013, 2015-2016 |
SEOCONTENT-START
Bulletin No.: PIP4912D
Date: Feb-2016
| Subject: | Duramax Intermittent High Idle Or Elevated Idle Descriptions |
| Models: | 2010 – 2016 Chevrolet Express, Silverado |
| 2010 – 2016 GMC Savana, Sierra | |
| Equipped with the 6.6 Duramax Diesel Engine RPO codes L5P, LGH and LML |
This PI was superseded to update Model Years. Please discard PIP4912C.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern
A dealer may encounter a customer concern of an intermittent high idle. High idles may be commanded by the ECM for certain battery charging electrical loads or diesel particulate filter (DPF) cleaning processes.
These idle up speeds may occur with no input from the customer. Idle speed descriptions are included below.
G-VAN / GMT610 LGH IDLE SPEEDS
| REASON | RPM | Conditions/Constraints | Enablement | Trans Gear |
| BASE IDLE | 680 | Warm engine | P,N,D | |
| 680-850 | Base engine curve -Varies with coolant 680-850 temps from -40C to 150C | P,N,D | ||
| Manual elevated idle (UF3) | 1200 (default) | 680 -1300 RPM selectable via Tech2 | Set parking brake, cruise ON. cruise SET | P,N |
| Cold temp warm-up (EPR) | 680-1200 | RPM level varies with coolant temp disabled once coolant temp reaches 68C delayed for extremely low coolant temps | Enabled by selection through DIC | P, N |
| DPF Regen | 800 | During Regen and post-regen cooldown, & HC clean-out | ||
| AIC | N/A | AlC idle speed request disabled by platform for 2011 | ||
| Low battery voltage | 725 | Assist battery charging | Level 1 Based on Platform BCM module request | P,N |
| 850 | Further assist battery charging | Level 2 Based on Platform BCM module request | P,N | |
| 850 | Further assist battery charging | Level 3 Based on platform BCM module request | P,N |
C/K Truck / GMT900 / K2XX L5P and LML IDLE SPEEDS
| REASON | RPM | Conditions/Constraints | Enablement | Trans Gear |
| BASE IDLE | 640 | Warm engine | P,N,D | |
| 640-850 | Base engine curve -Varies with coolant temps from -40C to 150C | P,N,D | ||
| Manual elevated idle (UF3) | 1200 (default) | 680 -1300 RPM selectable via Tech2 | Set parking brake, cruise ON, cruise SET | P,N |
| Cold temp warm-up (EPR) | 640-1050 | RPM level varies with coolant temp disabled once coolant temp reaches 68C delayed for extremely low coolant temps | Enabled by selection through DIC | P,N |
| DPF Regen | 800 | During Regen and post-regen cooldown, & HC clean-out | Auto | P,N,D |
| AIC | N/A | AlC idle speed request disabled by platform for 2011 | None | P,N |
| Low battery voltage | 750 | Assist battery charging | Level 1 Based on Platform BCM module request | P,N |
| 900 | Further assist battery charging | Level 2 Based on Platform BCM module request | P,N | |
| 1050 | Further assist battery charging | Level 3 Based on Platform BCM module request | P,N |
C/K Truck / GMT900 / K2XX LGH IDLE SPEEDS
| REASON | RPM | Conditions/Constraints | Enablement | Trans Gear |
| BASE IDLE | 600 | Warm engine | P,N,D | |
| 600-850 | Base engine curve -Varies with coolant temps from -40C to 150C | P,N,D | ||
| Manual elevated idle (UF3) | 1200 (default) | 680 -1300 RPM selectable via Tech2 | Set parking brake, cruise ON, cruise SET | P,N |
| Cold temp warm-up (EPR) | 600-1050 | RPM level varies with coolant temp disabled once coolant temp reaches 68C delayed for extremely low coolant temps | Enabled by selection through DIC | P,N |
| DPF Regen | 800 | During Regen and post-regen cool-down, & HC clean-out | Auto | P,N,D |
| AlC | NlA | AlC idle speed request disabled by platform for 2011 | None | P,N |
| Low battery voltage | 750 | Assist battery charging | P,N | |
| 900 | Further assist battery charging | P,N | ||
| 1050 | Further assist battery charging | P,N |
Recommendation/Instructions
If a dealer has duplicated, or the customer description aligns with the speeds mentioned in the idle speed description tables, the idle speed should be considered a normal characteristic of current vehicle design.
Do not attempt repairs for intermittent high idle as described in this PI.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
SEOCONTENT-END
Bulletin No.: PIP4912E
Date: Dec-2016
To View or Download this Document Click Here
Bulletin No.: PIP4912D
Date: Feb-2016
To View or Download this Document Click Here
Bulletin No.: PIP4912C
Date: Aug-2014
To View or Download this Document Click Here
Bulletin No.: PIP4912B
Date: Nov-2013
To View or Download this Document Click Here
| “This site contains affiliate links for which OEMDTC may be compensated” |
SaleBestseller No. 1
Hot Shot's Secret Everyday Diesel Treatment 16 Ounce Squeeze Bottle (HSSEDT16ZS)
- Boosts Cetane Up To 7 Points
- Increases Power, Performance, And Fuel Economy
- Stabilize Fuel & Disperse Moisture
- Increases Lubricity & Prevent Rust And Corrosion
Bestseller No. 2
Archoil AR6500 Diesel Treatment (40.6 oz) - Treats 400 Gallons - Additive for All Diesel Vehicles
- 40.6 oz bottle treats 400 gallons - Use at every fill-up
- Formulated to address issues with modern diesel fuels to restore and maximize performance and fuel economy (MPG)
- The only diesel treatment to clean the post-combustion system (turbo, DPF) to prevent premature failure and reduce regeneration frequency
- Incorporates Archoil's proven combustion modifier technology and a strong cetane boost to increase power and response
- Cleans, lubricates and protects your fuel system (including HPCR systems)
SaleBestseller No. 3
Archoil Diesel Fuel System Kit - AR6500 Diesel Treatment (40 oz) + AR6400-D Diesel Fuel System Cleaner
- Includes AR6500 Diesel Treatment (40 oz)
- Includes AR6400-D Diesel Fuel System Cleaner
- Restore key fuel system components - injectors, turbo & dpf
- Boost cetane, improve performance and MPG
- AR6400-D is not the remedy for HEUI injector stiction. Please use AR9100 Friction Modifier instead
SaleBestseller No. 4
Power Service Diesel Kleen + Cetane Boost 64oz Bottle (6 Pack) - Universal Fit, Boosts Cetane Up to 6 Numbers, Cleans Injectors, 10.17536 Liters
- Cleans dirty injectors and prevents injector sticking in both High Pressure Common Rail (HPCR) and older systems
- Boosts cetane up to 6 numbers – engines run smoother with less power lag and faster cold starts
- Effective in all diesel fuels, including ULSD, biodiesel and biodiesel blends
- Fit type: Universal
- Part number: 3064-06
Bestseller No. 5
Stanadyne Performance Formula Diesel Fuel Additive - 16 Oz. Case of 12
- Restores/Increase Horsepower: detergents clean deposits in the injection system
- Reduces Fuel Consumption tests show an average of 4 percent improvement in MPG and gains up to 9.6 Percent
- Cetane Improver improves combustion resulting in better engine starting, running and reduced noise
- Reduces Wear: Lubricity improvers restore lubricity to ultra low sulfur diesel fuels
- Reduces Emissions reduces Smoke and Particulates
Bestseller No. 6
Hot Shot's Secret Diesel Extreme 1 Gallon, Concentrated Fuel System Cleaner, Diesel Fuel Additive, Injector Cleaner - Increases MPG & Restores Engine Performance
- CLEANS FUEL STYSTEM: Hot Shot’s Secret Diesel Extreme is designed to thoroughly clean, lubricate, and safeguard all components of your engine & fuel system, such as valves, pumps, rings, pistons, and upper cylinders.
- CLEANS FUEL INJECTORS: Designed to eliminate & prevent the buildup of Internal Diesel Injector Deposits (IDIDs), External Diesel Injector Deposits (EDID's), as well as other stubborn varnish and deposits, this will keep your engine running smoothly.
- BOOSTS CETANE: Increases cetane (up to 7 points), for a more efficient combustion process, improved fuel economy, & increased engine power. It also helps reduce the frequency of DPF regenerations, ensuring a smoother driving experience.
- FIXES ISSUES: Non-alcohol-based water dispersant, fortified with military-grade rust and corrosion inhibitors, stabilizes & prevents rust, effectively dispersing moisture, this product ensures to improve overall engine performance.
- EASY TO USE: With a simple application of 8 oz. for every 20 gallons, this product is easy to use! Just pour it into your fuel tank during your next fill up or every 6,000 miles
SaleBestseller No. 7
Power Service Diesel Kleen +Cetane Boost - 12 Ounce (Pack of 9)
- Cleans dirty injectors and prevents injector sticking in both High Pressure Common Rail (HPCR) and older systems
- Removes both internal and external deposits on fuel injectors
- Restores lost power and fuel economy
- Contains Slickdiesel Lubricator to protect fuel pumps and injectors from increased wear caused by poor quality Ultra Low Sulfur Diesel (ULSD) fuel
- Effective in all diesel fuels, including ULSD, biodiesel and biodiesel blends
Bestseller No. 8
Opti-Lube XPD All Seasons Diesel Fuel Additive: 1 Gallon with Accessories (1 Hand Pump & 2 Empty 8oz Bottles) (1 Gallon XPD with Hand Pump and Regular Accessory Bottles)
- MADE FOR OPTIMAL LUBRICATION: Your truck has been there for you every minute and every mile, which is why it’s important to keep it in pristine condition and the tools in the toolbox. At Opti-Lube, our goal is to keep your engine operating at its best. Our fuel additive helps to increase the lubricity properties of ultra-low-sulfur diesel (ULSD) so that you can play more and worry less.
- IMPROVES FUEL ECONOMY: Trucks are known for eating up fuel. Fortunately, there’s a way to fix that with Opti-Lube XPD formula. This diesel fuel additive has been shown to enhance fuel mileage year round, giving you more bang for your buck. With greater fuel economy, you’ll find increased power for both summer and winter driving.
- CLEANS INJECTORS: When your fuel injectors build up with residue, your engine usually doesn’t run as efficiently. Opti-Lube XPD formula cleans injectors while helping prevent future build-up. This helps to reduce deposits and emissions, making this lube compatible with all vehicle emissions systems. Additionally, it acts as rust and corrosion prevention to keep your vehicle in tip-top shape.
- ENHANCES PERFORMANCE: Whether during rain, snow, or shine, Opti-Lube XPD formula delivers. It works to improve the performance of your truck all year round. This fuel additive also helps separate water from Diesel fuel as a demulsifier and more than doubles the storage life of standard diesel fuel. Contains enough Anti-Gel to keep fuel flowing down to -10F*.
- COMES WITH ACCESSORIES: With your purchase, you’ll receive 1 gallon of Opti-Lube XPD Formula Diesel Fuel Additive, a convenient hand pump, and 2 empty 8-ounce bottles for on-the-go travel. You can use the empty bottles for when you’re on the go. This diesel fuel treatment isn’t just limited to trucks; use it for your farm and construction equipment too!
Bestseller No. 9
Performance Formula One Shot 8oz, Case of 24 Bottles Treats 30 gallons Diesel Fuel per Bottle
- Restores/Increase Horsepower: detergents clean deposits in the injection system
- Reduces Fuel Consumption tests show an average of 4 percent improvement in MPG and gains up to 9.6 Percent
- Cetane Improver improves combustion resulting in better engine starting, running and reduced noise
- Reduces Wear: Lubricity improvers restore lubricity to ultra low sulfur diesel fuels
- Reduces Emissions reduces Smoke and Particulates
Bestseller No. 10
Opti-lube XPD All Seasons Diesel Fuel Additive: Gallon (1 Gallon (Treats 512 Gallons))
- MADE FOR OPTIMAL LUBRICATION: Your truck has been there for you every minute and every mile, which is why it’s important to keep it in pristine condition and the tools in the toolbox. At Opti-Lube, our goal is to keep your engine operating at its best. Our fuel additive helps to increase the lubricity properties of ultra-low-sulfur diesel (ULSD) so that you can play more and worry less.
- IMPROVES FUEL ECONOMY: Trucks are known for eating up fuel. Fortunately, there’s a way to fix that with Opti-Lube XPD formula. This diesel fuel additive has been shown to enhance fuel mileage year round, giving you more bang for your buck. With greater fuel economy, you’ll find increased power for both summer and winter driving.
- CLEANS INJECTORS: When your fuel injectors build up with residue, your engine usually doesn’t run as efficiently. Opti-Lube XPD formula cleans injectors while helping prevent future build-up. This helps to reduce deposits and emissions, making this lube compatible with all vehicle emissions systems. Additionally, it acts as rust and corrosion prevention to keep your vehicle in tip-top shape.
- ENHANCES PERFORMANCE: Whether during rain, snow, or shine, Opti-Lube XPD formula delivers. It works to improve the performance of your truck all year round. This fuel additive also helps separate water from Diesel fuel as a demulsifier and more than doubles the storage life of standard diesel fuel. Contains enough Anti-Gel to keep fuel flowing down to -10F*.
- ECONOMY: With a treatment rate up to 512 gallons it will cost you just pennies per treated gallon. This diesel fuel treatment isn’t just limited to trucks; use it for your farm and construction equipment too!
Last update on 2025-05-08 / Affiliate links / Images from Amazon Product Advertising API
This product presentation was made with AAWP plugin.
