P239A: Diesel Intake Air Flow B Position Sensor Circuit Intermittent or Erratic
Standardized SAE J2012 code · P23xx — Ignition system and misfire
What does P239A mean?
Same as P2396 with intermittent or erratic signal. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Common causes
- High Intermittent contact at connector
- Low Connector with intermittent contact under vibration
- Low Harness routed against vibrating component
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P239A on the same make and model first.
P239A in the community
Ask about P239ANo one has posted about P239A yet
Share your vehicle, the tool you used and what you tested — the first thread helps everyone who searches for this code.
Describe your P239A problem