AutoCodes – GMC – U1241 GMC

U1241 GMC Code - Lost Communications With Scan Tool

Quick Answer

The Passenger Presence System (PPS) monitors itself for faults and will set flash diagnostic trouble codes if a fault is detected. Common causes include No cause, Cycle Ignition Key and Clear Code. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: U1241 GMC indicates Lost Communications With Scan Tool.
Common causes: Common causes include No cause, Cycle Ignition Key and Clear Code.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 490

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 05, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code U1241 GMC Description

The Passenger Presence System (PPS) monitors itself for faults and will set flash diagnostic trouble codes if a fault is detected. The PPS communicates with the inflatable restraint Sensing and Diagnostic Module (SDM) via non class 2 communications. When the SDM receives input from the PPS that a PPS fault has occurred, the SDM will request the instrument panel cluster (IPC) to turn the AIR BAG indicator located on the IPC ON. To determine what Diagnostic Trouble Code (DTC) have been set by the PPS, the Tech 2 is used to command the SDM to request the PPS to flash the DTCs using the PASSENGER AIR BAG ON/OFF indicators. The Tech 2 sends a string of commands to the SDM that allows the SDM to communicate with the PPS module and initiate the flashing of the DTCs. When the Tech 2 has completed sending the commands, the PPS will begin flashing any current or history DTCs that the system has stored. When the SDM no longer receives commands from the Tech 2, the SDM mistakes this as a communication fault and sets DTC U1241. DTC U1241 will set when the Tech 2 is used to flash DTCs from the PPS or after the PPS has been rezeroed. DTC U1241 does not indicate a system malfunction and will not cause any warning indicators to illuminate. When DTC U1241 sets, cycle the ignition and use the scan tool to clear the code, no further diagnosis is necessary.

OBDII Code U1241 GMC - Lost Communications With Scan Tool - AutoCodes.com — U1241 GMC Code - Lost Communications With Scan Tool

What does this mean?

What are the Possible Causes of the DTC U1241 GMC?

No cause. Cycle Ignition Key and Clear Code.

How to Fix the DTC U1241 GMC?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

The Diagnostic Trouble Code (DTC) U1241 does not indicate a system malfunction and will not cause any warning indicators to illuminate. When DTC U1241 sets, cycle the ignition and use the scan tool to clear the code, no further diagnosis is necessary.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U1241 GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the U1241 GMC code?

Need more information on how to fix the U1241 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about U1241 GMC Code

1. What are common symptoms of OBDII code U1241 GMC "Lost Communications With Scan Tool"?

- Common symptoms include the inability to connect the scan tool to the vehicle's OBDII system, loss of communication between diagnostic tools and vehicle modules, and potential issues with diagnosing other codes.

2. What are possible causes of OBDII code U1241 GMC?

- Possible causes include faulty connections between the scan tool and the OBDII port, damaged or loose wiring, a malfunctioning scan tool, or issues with the vehicle's onboard communication system.

3. How can I diagnose the cause of OBDII code U1241 GMC?

- Start by checking the connections between the scan tool and the OBDII port for any issues. Ensure the wiring is intact and properly connected. Try using a different scan tool to rule out tool malfunctions. If the problem persists, consult a professional mechanic for further diagnosis.

4. Can OBDII code U1241 GMC affect the vehicle's performance?

- This code itself does not directly affect the vehicle's performance. However, the underlying communication issue between the scan tool and vehicle modules could potentially impact the diagnosis and resolution of other performance-related codes or issues.

5. What are some repair tips for resolving OBDII code U1241 GMC?

- Start by checking and securing all connections between the scan tool and OBDII port. Inspect the wiring for any damage or loose connections. Try using a different scan tool to see if the issue lies with the tool itself. If the problem persists, seek assistance from a qualified technician.

6. Can OBDII code U1241 GMC be cleared/reset without fixing the underlying issue?

- Clearing the code without addressing the underlying communication problem is not recommended. The code will likely reappear until the root cause is identified and resolved.

7. Is it safe to continue driving with OBDII code U1241 GMC present?

- It is generally safe to drive with this code present, as it does not pose an immediate threat to vehicle operation. However, it is important to address the communication issue to prevent potential diagnostic challenges in the future.

8. Can extreme weather conditions cause OBDII code U1241 GMC to trigger?

- Extreme weather conditions can potentially impact the vehicle's electrical systems, including communication interfaces. It is advisable to check for any weather-related damage or issues that may be contributing to the code.

9. Will disconnecting the vehicle's battery reset OBDII code U1241 GMC?

- Disconnecting the battery may reset the code temporarily, but it will likely reappear if the underlying communication issue is not resolved. It is best to address the root cause of the problem to prevent ongoing issues.

10. How much does it typically cost to repair OBDII code U1241 GMC?

- The cost of repairing this code can vary depending on the underlying cause. Simple fixes like checking connections or wiring may be inexpensive, while more complex issues could require professional diagnosis and repair, potentially increasing the cost.