P2A0A code meaning
Manifold Absolute Pressure Sensor B Circuit
Powertrain system Generic code P2Axx codes Check engine light
What P2A0A means
Engines with two intake manifold pressure sensors call the second one sensor B; in GM's tables for the Corvette's LT6 V8 it measures the manifold pressure of bank 2, next to the bank-1 sensor that uses the familiar P0105–P0109 codes. P2A0A is the general circuit fault of sensor B, meant for cases where the module sees a circuit problem without sorting it into low, high or intermittent. No manufacturer documents P2A0A publicly – the LT6 tables split electrical faults of this sensor into P2A0C and P2A0D. CARB requires checks for broken circuits and implausible extremes on every input that affects emissions. Without a usable MAP B signal the module estimates the air charge of the affected bank from a model, which can cost smoothness and power.
P2A0A at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyEasy, DIY possible
- Typical labor0.3 to 1.5 hours
- Clears after repairAfter a drive cycle
Symptoms of P2A0A
- Check engine light on
- Uneven running or hesitation
- Possible reduced power
Common causes of P2A0A
- Most likelyLoose connector, corroded terminal or damaged wire at sensor B
- PossibleMAP sensor B failed internally
- Less likely5 V reference shared with other sensors pulled down
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
MAP sensor bWiring harnessECM
What each part of P2A0A means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| A | Area: hybrid propulsion. |
| 0A | The exact fault in that area. |
What to do next
- Note P2A0A 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 P2A0A
What does P2A0A mean?
P2A0A means "Manifold Absolute Pressure Sensor B Circuit". Engines with two intake manifold pressure sensors call the second one sensor B; in GM's tables for the Corvette's LT6 V8 it measures the manifold pressure of bank 2, next to the bank-1 sensor that uses the familiar P0105–P0109 codes. It is a generic code, so it means the same on every make.
Is it safe to drive with P2A0A?
Drive gently and only to a workshop. With P2A0A the car can go into limp mode (reduced power) to protect itself.
Will P2A0A fail an emissions test?
Yes, it can. P2A0A 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 P2A0A to fix?
Difficulty: easy. A typical repair takes 0.3 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2A0A 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.