NHTSA ID Number: 11034447
Manufacturer Communication Number: SA-041-26
TSB/Document Date: 2026-07-03
Summary
This SA supersedes the previously issued SA(s) listed below. The changes are noted in Red. SA-061/25 12/17/25 DESCRIPTION If you encounter any type of electrical concern (e.g, dead battery, engine no start, DTC(s) stored...), interview the customer before proceeding with normal MGSS diagnosis by asking if any aftermarket devices have been installed. Aftermarket devices may be the cause of the electrical concern. Below are a few examples of unusual electrical concerns caused by aftermarket devices. Examples: 1. Devices connected to the DLC-2 (battery discharge/DTC stored) 2. Devices plugged into the 12V outlet 3. GPS tracking device (engine no start/battery discharge) 4. Dash cam (DTC stored) 5. Non-certified USB cable (Apple Carplay
™/ Android Auto™ will not connect) 6. Over-sized wheels/tires (incorrect GPS location) 7. DTC C0023:14 8. Decorative trim and/or cover on the START/STOP ENGINE button Example 1: Some electrical devices connected to the DLC-2 connector by insurance or mobile phone companies may cause: Battery discharge. The device may disrupt the CAN system battery saver mode. • IDS/MMDS will not communicate with the vehicle due to poor DLC-2 connection. The aftermarket device may cause DLC-2 female terminals to spread open.
BULLETIN NOTES
This SA supersedes the previously issued SA(s) listed below. The changes are noted in Red.
Previous SAs:
Date(s) Issued:
SA-061/25
12/17/25
SA-057/24
08/15/2024
SA-032/23
5/24/23 and 10/11/23
SA-075/22
11/14/22
APPLICABLE MODEL(S)/VINS:
2007-2026 Mazda3
2007-2015 Mazda5
2013-2026 CX-5
2023-2026 CX-50 (All)
2007-2021 Mazda6
2007-2012 CX-7
2016-2023 CX-3
2025-2026 CX-70 (All)
2007-2026 MX-5
2007-2023 CX-9
2020-2026 CX-30
2024-2026 CX-90 (All)
2007-2011 RX-8
2011-2023 Mazda2
2022-2023 MX-30
DESCRIPTION
If you encounter any type of electrical concern (e.g, dead battery, engine no start, DTC(s) stored...), interview the
customer before proceeding with normal MGSS diagnosis by asking if any aftermarket devices have been installed.
Aftermarket devices may be the cause of the electrical concern. Below are a few examples of unusual electrical concerns
caused by aftermarket devices.
Examples:
1. Devices connected to the DLC-2 (battery discharge/DTC stored)
2. Devices plugged into the 12V outlet
3. GPS tracking device (engine no start/battery discharge)
4. Dash cam (DTC stored)
5. Non-certified USB cable (Apple Carplay™/ Android Auto™ will not connect)
6. Over-sized wheels/tires (incorrect GPS location)
7. DTC C0023:14
8. Decorative trim and/or cover on the START/STOP ENGINE button
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Example 1:
Some electrical devices connected to the DLC-2 connector by insurance or mobile phone companies may cause:
• Battery discharge. The device may disrupt the CAN system battery saver mode.
• IDS/MMDS will not communicate with the vehicle due to poor DLC-2 connection. The aftermarket device may
cause DLC-2 female terminals to spread open.
• DTCs
B1041:54 - ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE
B108E:04 - CENTER DISPLAY INTERNAL MALFUNCTION
C0061:54 - DSC HU/CM
C1001:92 - FORWARD SENSING CAMERA (FSC)
C1001:97 - FORWARD SENSING CAMERA (FSC)
U300A:62 - ELECTRIC PARKING BRAKE (EPB)
U3004:17 - ACC RELAY CIRCUIT MALFUNCTION
U0415:00 - MAZDA RADAR CRUISE CONTROL (MRCC)/SMART BRAKE SUPPORT (SBS)
U0420:00 - MAZDA RADAR CRUISE CONTROL (MRCC)/SMART BRAKE SUPPORT (SBS)
Multiple DTC's (U0XXX:00 COMMUNICATION ERROR)
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NOTE: Some aftermarket devices may include a pig-tail connector or passthrough attached to the OBD-II
port. Be sure to check for any extensions, splitters, or other port adapters (see example image below).
• If an aftermarket device is found connected to DLC-2, take a photo and attach it to the RO. Advise the customer to
remove it.
• If you determine that no aftermarket devices have been installed, continue with normal MGSS diagnosis.
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Example 2:
Some aftermarket cell phone chargers, accessories connected to the 12V outlet or key fob proximity to a cell phone may
cause issues with the START/STOP button or rear view camera.
Possible symptoms can include:
•
•
•
•
•
•
•
•
Intermittent engine no start or unable to turn off
Instrument cluster red security indicator light ON
Engine Start/Start Button Amber indicator light flashing
Battery discharge
Electrical relay buzzing noise
DTC B13D3:94 stored (Communication error with remote transmitter)
DTC P1260:00 stored (Immobilizer system problem)
Rear View Monitor Display is Blurry
For concerns where the vehicle power supply cannot be controlled adequately, such as an engine no start condition or
the engine cannot be turned off, explain to the customer as follows: Due to the reverse power supply from electronic
devices with internal batteries connected through the vehicle's accessory socket, the vehicle system may not be able to
determine the vehicle electronic status. As a result, the vehicle power supply control fails.To overcome this situation,
remove the electronic device with internal batteries from the accessory socket.
Additionally, the above symptoms may be caused by the key fob in close proximity to a cell phone (radio waves may
interrupt the immobilizer system) Or Type "B" Key Transmitter Power Saving Function enabled (Refer to SA-020/21).
Aftermarket Cell Phone Charger/Accessory
Engine Start/Stop Button
Key Warning Light
connected to 12V outlet
Amber Indicator Light Flashing
(red)
Rear View Monitor Display is Blurry:
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Example 3:
Some aftermarket devices that are wired to the vehicles’s wiring harness may create unusual electrical symptoms and/or
store DTCs.
Below are examples of concerns due to an aftermarket GPS tracking device wired to the power window main switch:
• Engine no start
• Battery discharge
• Main relay buzzing
Below is an example of a dim headlight. The aftermarket device changed the headlight circuit resistance, causing a dim
headlight.
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Example 4:
DTC B119F:01 (TEL antenna No.1 malfunction) stored. This may be caused by an aftermarket dash cam, radar detector
and/or FasTrak device.
The aftermarket device may cause electrical noise disturbing the reception of GPS signals.
Example 5:
Apple Carplay™/ Android Auto™ will not function when connected to USB port. This may be caused a by low quality,
non-certified USB cable.
Example 6:
Navigation display map shows incorrect GPS location (A). This may be caused by over-sized wheels/tires. Confirm
correct wheel/tire size according to the tire label.
Navi Map Shows Incorrect GPS position (A)
Possible oversized wheels/tires
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Example 7:
DTC C0023:14 (Brake light circuit malfunction) stored. This may be caused by an aftermarket brake light flasher.
Example 8:
When programming a key or installing a Genuine Mazda Accessory Remote Engine Start system, you may encounter
programming difficulty. This may be caused by a customer installed aftermarket decorative trim and/or cover on the
START/STOP ENGINE button. The aftermarket accessory may create electrical interference, which may interfere with
programming.
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REPAIR PROCEDURE
1. Verify the customer concern.
• If the customer's concern(s) are verified to be caused by any aftermarket device as described in the examples
above, take a photo of the device and include it with the RO. The customer should also be advised to remove the
device.
• If it is determined that no aftermarket devices have been installed, continue with normal diagnosis on MGSS.
Please contact Technical Hotline for repeat visits.
2. Verify the repair.
WARRANTY INFORMATION
Use DSA to submit for non-problem found non-warrantable diagnosis for up to 0.7 hrs., if needed.
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TSB/Document ID: SA-041-26
Replacement Service Bulletin Number:
MFR Communication Date: 2026-06-19
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
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