What it means
The control circuit of alternative fuel tank shutoff valve E reports a control circuit low condition. Tank isolation cannot be commanded as expected on multi-tank CNG/LPG systems.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
- The engine or gearbox may go into limp mode
How it works
Shutoff valve E controls isolation of tank E in a multi-tank CNG or LPG system. The control module monitors the E control circuit and sets this code when its signal is lower than expected. A short to ground, an internally shorted coil, or a poor connector can cause the low reading.
Common causes
Most likely first.
- Control wire shorted to ground
- Internal short in valve coil
- Connector pins corroded - high contact resistance
Symptoms
- Check-engine light
- Alternative-fuel warning light
- Difficulty switching fuel modes
How to diagnose it
- Record freeze-frame data and check whether the fault returns when a scan tool commands valve E.
- Inspect valve E's connector and harness for corrosion, damaged insulation, loose terminals, or wiring touching ground.
- With the system disabled as specified by the manufacturer, check the E control circuit for a short to ground.
- Measure valve E's coil and circuit against the manufacturer's specification to distinguish a shorted coil from a harness fault.
- If wiring and coil checks pass, test the control-module output with the vehicle's approved procedure.
Common fixes
- Clean and secure corroded or loose valve E connector terminals.
- Repair control wiring shorted to ground.
- Replace valve E if its coil is internally shorted.
- Repair the control-module circuit if testing confirms an output fault.
Can I keep driving?
Do not rely on tank E isolation or normal fuel switching while this fault is active. Follow the vehicle's alternative-fuel warnings and stop using that fuel if the system reports it is unavailable.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.