NHTSA ID Number: 10185732
Manufacturer Communication Number: PIT5386F
Summary
This Preliminary Information communication provides information to the technician about vehicles that are found to have a back-up alarm inoperative during the Pre-Delivery Inspection. On trucks equipped with the Back Up Alarm (RPO 8S3), the alarm will be intentionally left disconnected from the assembly plant. Technician will reroute the harness and plug it in.
30 Affected Products
Vehicles
| MAKE | MODEL | YEAR |
| CHEVROLET | SILVERADO 1500 | 2014-2021 |
| CHEVROLET | SILVERADO 2500 | 2015-2021 |
| GMC | SIERRA 1500 | 2014-2021 |
| GMC | SIERRA 2500 | 2015-2021 |
Condition / Concern
Backup alarm is inoperative. Trucks equipped with the Back Up Alarm (RPO 8S3), the alarm will be intentionally left disconnected from the assembly plant.
1 Associated Document
Manufacturer Communications
Bulletin No.: PIT5386F
Published date: 12/14/2020
NHTSA ID Number: 10144462
Manufacturer Communication Number: PIT5386D
Summary
This Preliminary Information communication provides information to the technician about vehicles that are found to have a back-up alarm inoperative during the Pre-Delivery Inspection. On trucks equipped with the Back Up Alarm (RPO 8S3), the alarm will be intentionally left disconnected from the assembly plant. Technician will reroute the harness and plug it in.
1 Associated Document
Manufacturer Communications
Bulletin No.: PIT5386D
Published date: 08/20/2018
MC-10144462-9999.pdf 476.774KB
1 Associated Document
Manufacturer Communications
Bulletin No.: PIT5386A
Published date:
- HIGH SOUND LEVEL: MIRKOO backup alarm can make a powerful beeping sound that is 110dB(±3dB). Nobody will ignore this beeping sound when you are reversing vehicle.
- PREMIUM QUALITY: MIRKOO backup alarm is made from premium quality materials to ensure durability and longevity. High decibel, good sound quality, low current, and long lifespan. It can work in a variety of temperature environments, no matter you are in Florida or Alaska.
- EASY TO INSTALL: Our backup alarm is very easy to install, you just need to splice a wire from the positive screw terminal to the power wires of the reverse light or a reverse switch installed on the dashboard, then splice a wire to the ground(Negative wire).
- UNIVERSAL FIT: MIRKOO backup alarm is designed to work on 12-80 Volt DC vehicles. It will automatically adjust to a voltage range of 12-80 volt vehicles. Including Trucks Vans Freight Vehicles Cars Lorries SUV.
- Manufacturer sales
- 【HIGH SOUND LEVEL】: OXAMBIR backup alarm can make a powerful beeping sound that is 110dB(±3dB). Nobody will ignore this beeping sound when you are reversing vehicle.
- 【Upgrade protection capabilities】：OXAMBIR Backup alarm Made of high quality nylon Material + Waterproof housing with epoxy embedded electronics, excellent waterproof and dustproof capability, up to IP67 level, can work persistently in temperatures and environments ranging from -30 to 80 degrees Celsius.
- 【EASY TO INSTALL】: Our backup alarm is very easy to install, you just need to splice the positive wire (red wire) to the power wires of the reverse light or a reverse switch installed on the dashboard, then splice another wire(black) to the ground Negative wire.
- 【UNIVERSAL FIT】: Universal for 12V- 48V heavy-duty vehicles and commercial use,best for trucks, vans, buses, pickups, forklifts, semi-trailers, RV's, construction vehicles,excavators,construction machinery,special vehicles,parking and a variety of large vehicles container vehicles.Universal Mounting Bracket with Slotted Holes,can be Mounted Many Place in your Vehicle.
- 【Package Include】: 6pcs Back up Alarm ,1 Year Old WARRANTY. If you have any questions about our products, please message us before your purchasing. If you have any problems with the products you received, please contact us in time, we will serve you wholeheartedly!
- HIGH SOUND LEVEL: MIRKOO backup alarm can make a powerful beeping sound that is 110dB(±3dB). Nobody will ignore this beeping sound when you are reversing vehicle.
- PREMIUM QUALITY: MIRKOO backup alarm is made from premium quality materials to ensure durability and longevity. High decibel, good sound quality, low current, and long lifespan. It can work in a variety of temperature environments, no matter you are in Florida or Alaska.
- EASY TO INSTALL: MIRKOO backup alarm is very easy to install, you just need to splice a wire from the positive screw terminal to the power wires of the reverse light or a reverse switch installed on the dashboard, then splice a wire to the ground(Negative wire).
- UNIVERSAL FIT: MIRKOO backup alarm is designed to work on 12-80 Volt DC vehicles. It will automatically adjust to a voltage range of 12-80 volt vehicles. Including Trucks Vans Freight Vehicles Cars Lorries SUV.
- 12V-48V Auto-Ranging 107dB Backup Alarm (No Jumper Needed) Broadband reverse beeper that auto-scales to system voltage — works on 12V pickups, 24V box trucks, 36V industrial stackers, and 48V electric forklifts without resistor mods or voltage selectors. Emits 103-111 dB(A) at 1 meter (typical 110dB ±3dB). Draws ~1A. Match your vehicle's reverse-lamp circuit voltage before ordering. Not a 3-wire relay module, not a backup camera, not a horn.
- Universal 2-terminals Install — Red to Reverse +, Black to Ground Connect red lead to reverse lamp positive or reverse switch output, black lead to chassis ground. No relay, no additional module. Includes 3.25-inch industry-standard slotted bracket with 2-screw terminals. Mounts to frame rail, bumper, battery box, or rear crossmember. Reuse existing hardware or use supplied bracket holes.
- Covers Class 3-8 Trucks, Vans, Forklifts, Buses & Heavy Equipment Engineered for Class 3-8 trucks, cargo vans, freight lorries, semi-trailers, forklifts, school buses, RVs, excavators, loaders, agricultural tractors, yard goats. One SKU replaces fleet-specific beepers across mixed-voltage yards.
- IP67 Waterproof for Harsh Outdoor Conditions Sealed ABS housing with silicone gasket survives pressure washing, rain, mud, snow, and salt spray. Rated IP67 — dust-tight and waterproof to 1 meter immersion. Copper-alloy internal wiring resists vibration fatigue on rough terrain. Operating temperature range -40°F to 185°F.
- 107dB Penetrates Jobsite Noise — Confirm 2-terminals& Voltage Range Critical: This alarm is 2-terminals only (power + ground). If your vehicle requires a 3-wire unit with a separate trigger/ignition lead, this will not work. Also confirm your system voltage is 12-48V DC — not 6V, not 72V/80V industrial (some large forklifts exceed 48V). If installing on a 48V electric vehicle, verify the reverse circuit is 48V, not a separate 12V accessory circuit.
SEOCONTENT-START
Bulletin No.: PIT5386F
Published date: 12/14/2020
Preliminary Information
PIT5386F Back Up Alarm Inoperative and needs to be Connected During PDI
Product Investigation Review Required
Models
| Brand: | Model: | Model Years: | VIN: | Engine: | Transmissions: | |
| from | to | |||||
| Chevrolet | Silverado 1500 | 2014 – 2021 | All All All | All | ||
| Chevrolet | Silverado 2500/3500 | 2015 – 2021 | All | All | All | All |
| GMC | Sierra 1500 | 2014 – 2021 | All All All | All | ||
| GMC | Sierra 2500/3500 | 2015 – 2021 | All | All | All | All |
Supersession Statement
This PI was superseded to update the model years and Correction. Please discard PIT5386E.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition / Concern
During the PDI it may be noticed that the backup alarm is inoperative. Trucks equipped with the Back Up Alarm (RPO 8S3), the alarm will be intentionally left disconnected from the assembly plant.
Recommendations / Instructions
- For 2020/2021 3500 Chassis Cab models (31003, 31043, and 31403) the back up alarm is not installed on the truck’s frame and it has been left loose inside the cab from the assembly plant. It is the up tters responsibility to mount the back up alarm and splice into the reverse circuit. The labor op listed below does not apply to these vehicles because no additional work is needed during PDI.
- For All Other Trucks, the alarm is located on the right rear of the frame, and the chassis harness alarm connector is located on the left rear of the frame. Route the harness up and over the spare tire hoist tube and connect to the backup alarm.
- Back Up Alarm/Connector
- Chassis Harness Alarm Connector
Warranty Information
For vehicles repaired under the Bumper-to-Bumper coverage (Canada Base Warranty coverage), use the following labor operation. Reference the Applicable Warranties section of Investigate Vehicle History (IVH) for coverage information.
| Labor Operation | Description | Labor Time |
| 0590032 | PDI – Dealer Installed – Factory Invoiced Options | Use Published Labor Operation Time |
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.
Additional SI Keywords
backup reverse shift
SEOCONTENT-END
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