P00B8 code meaning
MAP - Mass or Volume Air Flow Correlation Bank 2
Powertrain system Generic code P00xx codes Check engine light
What P00B8 means
On engines with two intake paths, the control module compares the manifold pressure of bank 2 with the measured or calculated air quantity of that bank. P00B8 is set when the two do not fit together; the code does not say which value is wrong. As with its bank 1 counterpart, typical causes are an air leak, an exhaust gas recirculation valve that does not close, or a dirty or drifting sensor. Each sensor can be electrically fine on its own. No manufacturer description naming this exact code was found; the explanation follows its documented counterpart.
P00B8 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2 hours
- Clears after repairAfter a drive cycle
Symptoms of P00B8
- Check engine light on
- Rough running
- Mixture codes possible
Common causes of P00B8
- Most likelyAir leak in the intake of bank 2
- PossibleEGR valve dirty or sticking open
- PossibleManifold pressure sensor or air flow meter dirty or drifting
- Less likelyWiring or connector faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Manifold absolute pressure sensorMass air flow sensorEGR valveIntake manifold
What each part of P00B8 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 0 | Area: fuel and air metering and auxiliary emission controls. |
| B8 | The exact fault in that area. |
What to do next
- Note P00B8 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P00B8
What does P00B8 mean?
P00B8 means "MAP - Mass or Volume Air Flow Correlation Bank 2". On engines with two intake paths, the control module compares the manifold pressure of bank 2 with the measured or calculated air quantity of that bank. It is a generic code, so it means the same on every make.
Is it safe to drive with P00B8?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P00B8 fail an emissions test?
Yes, it can. P00B8 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P00B8 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P00B8 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.