P1326 The powertrain control module saw an abnormal combustion quality signal from the ignition control module
This fault is part of the Honda misfire codes guide. It covers the system and the order to check it.
What does P1326 mean on a Honda?
P1326. The powertrain control module saw an abnormal combustion quality signal from the ignition control module. Misfire detection may be affected and the engine can run rough.. This Honda-enhanced code applies to Honda and Acura models that use this code.
Common causes of P1326
- Faulty Ignition Control Module (ICM)
- Ignition Control Module (ICM) harness is open or shorted
- Ignition Control Module (ICM) circuit poor electrical connection
How to fix P1326
- Confirm the code with a scan tool and check for misfire codes
- Inspect the voltage detection module connector and wiring
- Check the circuit between the module and the control module for an open or short
- Test the module signal against the factory spec
- Replace the module if it fails testing, then clear codes and retest
Sources and review
- Based on one independent source.
- Last updated 2026-10-02.