P2A68Alternative Fuel Tank C Level Sensor Circuit Intermittent/Erratic
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- The last code of this block covers a tank C level signal that flickers: it is valid most of the time but suffers short gaps or jumps unrelated to fuel movement. On vehicles with three tanks the wiring to tank C is often the longest and has the most joints, each a chance for a loose crimp or green corrosion; frame flex can open a fractured conductor for an instant. Where the level is computed from CNG pressure, a flickering pressure input (P2A4A) can be the real source. No manufacturer documents P2A68; it parallels P2A63 for tank B and P01B3 for tank A, and CARB treats erratic inputs as part of component monitoring. Stored freeze-frame values plus live level data on a test drive narrow it down.
- What you may notice
- Tank C level jumps on the display
- Check engine light now and then
- Range display unsteady
- Likely causes
- LikelyLoose crimp or corroded joint in the long tank C harness
- PossibleConductor fractured, opening under frame flex
- RareUnsteady tank C pressure input behind a calculated level (CNG)
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.