P20E9 Possible Causes
- Damaged reductant pump
- Damaged reductant injector
- Damaged reductant purge valve
- Damaged reductant pressure line
- Damaged reductant pressure sensor
What Does It Mean?
How to Fix P20E9 Code
Check the “possible causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
P20E9 Possible Symptoms
Engine light on (or service engine soon warning light)
P20E9 Meaning
The Powertrain Control Module (PCM) monitors the reductant pressure when the system is preparing for injection. The DEF post-treatment pump has internal diagnostics that assess whether the DEF pump is capable of meeting its demand. If the pump reports insufficient performance for more than a threshold time, the P20E8 code is set.