Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
PRNDL DISP MSG Not Received
Monitored & Set Condition
- When Monitored: Ignition in the on position.
- Set Condition: Memory Heated Seat Mirror Module does not receive a PRNDL Bus message from TCM.
Possible Causes:
- EATX Response
- Stored Code/Communication Problems
- Memory Heated Seat Mirror Module
- Intermittent Problem
Testing
- Turn ignition off. Connect scan tool to Data Link Connector (DLC). Turn ignition on. Using scan tool, attempt to communicate with Transmission Control Module (TCM). If scan tool communicates with TCM, go to next step. If scan tool does not communicate with TCM, perform NO RESPONSE FROM TRANSMISSION CONTROL MODULE OR BUS +/- SIGNALS OPENΒ test under COMMUNICATIONS SYSTEM.
- Using scan tool, clear PRNDL DISP MSG NOT RECEIVED DTC from Memory Heated Seat/Mirror Module. Turn ignition off, then start engine. Wait one minute. Using scan tool, retrieve DTCs. If PRNDL DISP MSG NOT RECEIVED DTC resets, go to next step. If PRNDL DISP MSG NOT RECEIVED does not reset, test is complete.
- Check related wiring and connectors for poor connections or damage to wiring harness. See WIRING DIAGRAMSΒ . Repair any problems found as necessary. If no problems are found, replace MHSMM. See MEMORY HEATED SEAT/MIRROR MODULEΒ under REMOVAL & INSTALLATION.
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.
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