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.
DTC P1437 (41): Motor Power Inverter (MPI) Module Short Circuit
- Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
- If the DTC cannot be cleared, do the troubleshooting for DTC 111204(55).
- Turn the ignition switch to ON (II).
- Clear the DTC with the HDS (see DTC CLEAR ).
- Turn the ignition switch to LOCK (0), and wait 1 minute.
- Turn the ignition switch to ON (II).
- Turn the headlights on high beam.
- Start the engine, and let it idle for 1 minute.
- Monitor the OBD STATUS for DTC P1437 (41) in the DTCs MENU with the HDS.
Does the screen indicate FAILED?
YES -go to step 8.
NO -If the screen indicates PASSED, intermittent failure, the system is OK at this time. If the screen indicates NOT COMPLETED, go to step 1.
- Check for Pending or Confirmed DTCs with the HDS.
Is DTC P06B1 (79), P0AA6 (59), P1440 (57), P15A5 (85), or P1634 (47) indicated?
YES -Go to the indicated DTC's troubleshooting.
NO -Replace the MPI module (see MOTOR POWER INVERTER (MPI) MODULE REMOVAL/INSTALLATION ), then go to step 9.
- Turn the ignition switch to ON (II).
- Clear the DTC with the HDS (see DTC CLEAR ).
- Turn the ignition switch to LOCK (0), and wait 1 minute.
- Turn the ignition switch to ON (II).
- Turn the headlights on high beam.
- Start the engine, and let it idle for 1 minute.
- Check for Pending or Confirmed DTCs with the HDS.
Is DTC P1437 (41) indicated?
YES -Check for poor connections or loose terminals at the MPI module, then go to step 1.
NO -go to step 16.
- Monitor the OBD STATUS for DTC P1437 (41) in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 15, go to the indicated DTC's troubleshooting.
NO -If the screen indicates FAILED, check for poor connections or loose terminals at the DC-DC converter and the MPI module, then go to step 1. If the screen indicates NOT COMPLETED, keep the ignition switch ON (II) until a result comes on.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.