What it means
Generic electrical fault on alternative fuel tank A pressure sensor (CNG, LPG, hydrogen).
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Alternative fuel tank A pressure sensor reports pressure in the vehicle's CNG, LPG, or hydrogen fuel tank to the control module. The module monitors the sensor circuit for electrical faults that could make the pressure signal unreliable. This code sets when it detects a circuit problem, without specifying a low or high signal condition.
Common causes
Most likely first.
- Pressure sensor failure
- Open or short in sensor wiring
- Loose, damaged, or corroded connector
Symptoms
- Check-engine light on
- Alternative-fuel pressure reading may be inaccurate or unavailable
- Alternative-fuel system warning may appear
How to diagnose it
- Save the freeze-frame data and check scan-tool data for alternative fuel tank A pressure, noting whether the reading is missing, implausible, or intermittent.
- With the vehicle made safe according to the manufacturer's instructions for its fuel type, inspect tank A's pressure sensor connector and nearby wiring for damage, corrosion, looseness, or chafing.
- Check the sensor circuit for an open, short, or poor connection using the vehicle wiring diagram and manufacturer's test procedure.
- Verify the sensor's supply, ground, and signal circuits against the manufacturer's specification.
- If the wiring and connections pass, test alternative fuel tank A pressure sensor and replace it if its output is faulty.
Common fixes
- Secure a loose connector or clean corroded terminals.
- Repair damaged or shorted wiring in the tank A pressure sensor circuit.
- Replace a faulty alternative fuel tank A pressure sensor.
- Clear the code and confirm the pressure reading is available and plausible.
Can I keep driving?
Drive cautiously only if the vehicle runs normally and the alternative-fuel system shows no warning requiring shutdown; the pressure reading may be unreliable. If a fuel-system warning appears or you suspect a leak, stop in a safe place and follow the vehicle's fuel-system safety instructions.
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.