Manifold Absolute Pressure Sensor B Circuit Range/Performance
The MAP B signal does not correlate with TPS, MAF, or RPM as expected. Vacuum leak, restricted port, or sensor drift.
Affected components
- Map sensor b
- Wiring harness
- Ecm
Common causes
- High likelihood: Vacuum leak in intake
- Medium likelihood: Sensor zero drifted
- Low likelihood: Sensor element aged beyond calibration window
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.