P0AF9 Possible Causes
- 36-volt battery cable open
- Hybrid battery pack fuse open
- Hybrid battery contactor open
- Hybrid battery pack ground cable or connection
What Does It Mean?
How to Fix Code P0AF9
Check the “possible causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
P0AF9 Possible Symptoms
Engine light on (or service engine soon warning light)
P0AF9 Meaning
The Engine Control Module (ECM) monitors the correlation between the battery disconnect control module battery voltage and the starter generator control module (SGCM) output voltage to detect a 36-volt cable open or fuse/relay failure. The ECM also monitors for overvoltage conditions and protects the MOSFET (charge discharge). If any of these conditions are detected, the appropriate diagnostic trouble code (DTC) is set.