Bulletin No.: PIC5650M

Service Bulletin

Date: August, 2025

PRELIMINARY INFORMATION
Subject:

Diagnostic Tip - Security Light on Intermittently / No Crank/No Start or Start
Stall / Keyless Access Vehicles May Display No Remote/Fob Detected / Poor or
No RKE Range / Service TPM

Brand:

Model:

Model Year:
from

All

All

VIN:
to

2007 - 2026

from
All

Engine:

Transmission:

to
All

All

All

Supersession Statement
This PI was superseded to update the Models. Please discard PIC5650L.

A customer may comment on any of the following complaints:
-

Intermittent no crank

-

Intermittent no start, or start and stall

-

Security / Theft light / Message

-

Poor or no RKE range

-

Keyless or passive entry/start inoperative

-

No Fob Detected message

-

Service Tire Pressure Monitor message

-

Any of the following DTC's: B3055, B3060, B3935, C0750, C0755, C0760, C0765, and/or C0775.

Note: On vehicles equipped with keyless/passive start, the vehicle will start if the fob is placed in the fob pocket.
In most cases, these concerns cannot be duplicated.
The above systems use Radio Frequency (RF) to transmit information. Some aftermarket devices cause Radio
Frequency Interference (RFI), which can "jam" the radio frequency being transmitted.
Listed below are a number of aftermarket devices that can cause RFI. In many cases, these types of devices will be
attached to the customer's key ring and could be removed from the key ring or from inside the vehicle when the
customer drops the vehicle off for service.
-

Vehicle immobilizer keys from other vehicles

-

Keyless access transmitters from other vehicles

-

Interstate/bridge toll passes

-

Gate/door passes to allow access to pools, driveways, entry doors, etc.

-

Community/parking access cards

-

Fuel station speed passes

-

Building access swipe cards/ transponder devices

Copyright 2025 General Motors. All Rights Reserved.

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Additional items to be aware of:
-

Aftermarket LED dome, tail, turn, stop, strip, floor, door, Logo, head lights
In many cases, when the LED lighting is turned on it can interfere with a RF signal. Example, RKE inoperative
after the first fob button press. When the RKE fob button is pressed the dome lights may turn on, which if
equipped with an aftermarket LED dome light, it can interfere with any additional fob button presses.

-

Certain aftermarket window tints can cause RKE range or Passive Entry/Start issues

-

Certain cell phone chargers

-

USB power banks

-

USB flash lights

-

Fans (12 volt or 110 volt)

-

Any type of USB, 12 volt or 110 volt chargers

-

“Bedazzle Trim Ring” surrounding ignition lock cylinder, shown below (1)

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Correction
Important: Do not replace any parts for this concern prior to duplicating the concern and reviewing the following
information:
Before any in depth diagnosis is performed, question the customer or inspect the vehicle for any types of aftermarket
equipment, like shown above, which could cause RFI. These items need to removed and/or disconnected from
the vehicle.
It is possible to get RFI from transponders or other frequency emitting devices in the area. Aftermarket RFI meters/
sniffers are available that can be utilized as an aid to locate stray RFI signals. It is important to know what the
complaint is and what frequency you are checking. When testing a vehicle for stray RFI signals there are three
common frequencies that are used; 315 MHZ, 433 MHz, and 125 kHz. Make sure the meter you use checks for
frequencies at and around these 3 commonly used frequencies.
315 MHz (RKE and TPM frequency)
433 MHz (RKE and TPM frequency)
125 kHz (Passive entry antennas used on vehicles with passive start/entry)
In some cases, the use of the J 43241 Keyless Entry Tester or EL-52545 Tire Pressure Monitor Sensor and RF
Diagnostic Tools to scan the vehicle for stray RFI signals have been useful. Remember while scanning the vehicle
you may need to turn on and off electrical devices to see if they are causing the RF interference. An example of this
is if a vehicle is equipped with aftermarket LED dome lights. If the dome lights are not on when you scan the
vehicle, no interference will be found.
Important: Dealer should also direct their customers to the appropriate section in the Owner manuals that references that the device complies with Part 15 of the FCC Rules. Examples, of where this info may be found depend on
the model and/or year. This may be found under Immobilizer Operation, Keyless Entry, Keyless Access, or Radio
Frequency Statement sections.

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these
technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper
service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job
properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your
vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the
information.

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